45 results on '"Tuke, MA"'
Search Results
2. Whole-genome sequencing to understand the genetic architecture of common gene expression and biomarker phenotypes
- Author
-
Wood, AR, Tuke, MA, Nalls, M, Hernandez, D, Gibbs, JR, Lin, H, Xu, CS, Li, Q, Shen, J, Jun, G, Almeida, M, Tanaka, T, Perry, JR, Gaulton, K, Rivas, M, Pearson, R, Curran, JE, Johnson, MP, Göring, HH, Duggirala, R, Blangero, J, Mccarthy, MI, Bandinelli, S, Murray, A, Weedon, MN, Singleton, A, Melzer, D, Ferrucci, L, and Frayling, TM
- Subjects
Adult ,Genetic Markers ,Male ,Genotyping Techniques ,Quantitative Trait Loci ,and over ,Medical and Health Sciences ,Polymorphism, Single Nucleotide ,Young Adult ,Gene Frequency ,80 and over ,Humans ,Polymorphism ,Genetic Association Studies ,Aged ,Genetics & Heredity ,Aged, 80 and over ,Genome ,Genome, Human ,Association Studies Articles ,Genetic Variation ,High-Throughput Nucleotide Sequencing ,Single Nucleotide ,Biological Sciences ,Middle Aged ,Phenotype ,Female ,Human - Abstract
Initial results from sequencing studies suggest that there are relatively few low-frequency (
- Published
- 2014
3. S-47 Investigating MOM Resurfacing Hip Failure – A Novel Methodology
- Author
-
A. Roques, Christian Maul, Tuke Ma, and Andrew Taylor
- Subjects
Rehabilitation ,Biomedical Engineering ,Biophysics ,Orthopedics and Sports Medicine - Published
- 2010
4. Wear induced by motion between bone and titanium or cobalt-chrome alloys
- Author
-
Bischoff, UW, primary, Freeman, MA, additional, Smith, D, additional, Tuke, MA, additional, and Gregson, PJ, additional
- Published
- 1994
- Full Text
- View/download PDF
5. Retrieval analysis of squeaking alumina ceramic-on-ceramic bearings.
- Author
-
Walter WL, Kurtz SM, Esposito C, Hozack W, Holley KG, Garino JP, and Tuke MA
- Published
- 2011
- Full Text
- View/download PDF
6. Genome-wide associations for birth weight and correlations with adult disease
- Author
-
Horikoshi, M, Beaumont, RN, Day, FR, Warrington, NM, Kooijman, MN, Fernandez-Tajes, J, Feenstra, B, Van Zuydam, NR, Gaulton, KJ, Grarup, N, Bradfield, JP, Strachan, DP, Li-Gao, R, Ahluwalia, TS, Kreiner, E, Rueedi, R, Lyytikäinen, L-P, Cousminer, DL, Wu, Y, Thiering, E, Wang, CA, Have, CT, Hottenga, J-J, Vilor-Tejedor, N, Joshi, PK, Boh, ETH, Ntalla, I, Pitkänen, N, Mahajan, A, Van Leeuwen, EM, Joro, R, Lagou, V, Nodzenski, M, Diver, LA, Zondervan, KT, Bustamante, M, Marques-Vidal, P, Mercader, JM, Bennett, AJ, Rahmioglu, N, Nyholt, DR, Ma, RCW, Tam, CHT, Tam, WH, CHARGE Consortium Hematology Working Group, Ganesh, SK, Van Rooij, FJA, Jones, SE, Loh, P-R, Ruth, KS, Tuke, MA, Tyrrell, J, Wood, AR, Yaghootkar, H, Scholtens, DM, Paternoster, L, Prokopenko, I, Kovacs, P, Atalay, M, Willems, SM, Panoutsopoulou, K, Wang, X, Carstensen, L, Geller, F, Schraut, KE, Murcia, M, Van Beijsterveldt, CEM, Willemsen, G, Appel, EVR, Fonvig, CE, Trier, C, Tiesler, CMT, Standl, M, Kutalik, Z, Bonàs-Guarch, S, Hougaard, DM, Sánchez, F, Torrents, D, Waage, J, Hollegaard, MV, De Haan, HG, Rosendaal, FR, Medina-Gomez, C, Ring, SM, Hemani, G, McMahon, G, Robertson, NR, Groves, CJ, Langenberg, C, Luan, J, Scott, RA, Zhao, JH, Mentch, FD, MacKenzie, SM, Reynolds, RM, Early Growth Genetics (EGG) Consortium, Lowe, WL, Tönjes, A, Stumvoll, M, Lindi, V, Lakka, TA, Van Duijn, CM, Kiess, W, Körner, A, Sørensen, TIA, Niinikoski, H, Pahkala, K, Raitakari, OT, Zeggini, E, Dedoussis, GV, Teo, Y-Y, Saw, S-M, Melbye, M, Campbell, H, Wilson, JF, Vrijheid, M, De Geus, EJCN, Boomsma, DI, Kadarmideen, HN, Holm, J-C, Hansen, T, Sebert, S, Hattersley, AT, Beilin, LJ, Newnham, JP, Pennell, CE, Heinrich, J, Adair, LS, Borja, JB, Mohlke, KL, Eriksson, JG, Widén, E, Kähönen, M, Viikari, JS, Lehtimäki, T, Vollenweider, P, Bønnelykke, K, Bisgaard, H, Mook-Kanamori, DO, Hofman, A, Rivadeneira, F, Uitterlinden, AG, Pisinger, C, Pedersen, O, Power, C, Hyppönen, E, Wareham, NJ, Hakonarson, H, Davies, E, Walker, BR, Jaddoe, VWV, Järvelin, M-R, Grant, SFA, Vaag, AA, Lawlor, DA, Frayling, TM, Smith, GD, Morris, AP, Ong, KK, Felix, JF, Timpson, NJ, Perry, JRB, Evans, DM, McCarthy, MI, and Freathy, RM
- Subjects
quantitative trait ,hypertension ,intrauterine growth ,genome-wide association studies ,metabolic disorders ,3. Good health - Abstract
Birth weight (BW) has been shown to be influenced by both fetal and maternal factors and in observational studies is reproducibly associated with future risk of adult metabolic diseases including type 2 diabetes (T2D) and cardiovascular disease. These life-course associations have often been attributed to the impact of an adverse early life environment. Here, we performed a multi-ancestry genome-wide association study (GWAS) meta-analysis of BW in 153,781 individuals, identifying 60 loci where fetal genotype was associated with BW ($\textit{P}$ < 5 × 10$^{-8}$). Overall, approximately 15% of variance in BW was captured by assays of fetal genetic variation. Using genetic association alone, we found strong inverse genetic correlations between BW and systolic blood pressure ($\textit{R}$ $_{g}$ = -0.22, $\textit{P}$ = 5.5 × 10$^{-13}$), T2D ($\textit{R}$ $_{g}$ = -0.27, $\textit{P}$ = 1.1 × 10$^{-6}$) and coronary artery disease ($\textit{R}$ $_{g}$ = -0.30, $\textit{P}$ = 6.5 × 10$^{-9}$). In addition, using large -cohort datasets, we demonstrated that genetic factors were the major contributor to the negative covariance between BW and future cardiometabolic risk. Pathway analyses indicated that the protein products of genes within BW-associated regions were enriched for diverse processes including insulin signalling, glucose homeostasis, glycogen biosynthesis and chromatin remodelling. There was also enrichment of associations with BW in known imprinted regions ($\textit{P}$ = 1.9 × 10$^{-4}$). We demonstrate that life-course associations between early growth phenotypes and adult cardiometabolic disease are in part the result of shared genetic effects and identify some of the pathways through which these causal genetic effects are mediated.
7. Detection and characterization of male sex chromosome abnormalities in the UK Biobank study.
- Author
-
Zhao Y, Gardner EJ, Tuke MA, Zhang H, Pietzner M, Koprulu M, Jia RY, Ruth KS, Wood AR, Beaumont RN, Tyrrell J, Jones SE, Lango Allen H, Day FR, Langenberg C, Frayling TM, Weedon MN, Perry JRB, Ong KK, and Murray A
- Subjects
- Biological Specimen Banks, Humans, Male, Sex Chromosome Aberrations, United Kingdom epidemiology, XYY Karyotype, Diabetes Mellitus, Type 2, Klinefelter Syndrome diagnosis, Klinefelter Syndrome epidemiology, Klinefelter Syndrome genetics
- Abstract
Purpose: The study aimed to systematically ascertain male sex chromosome abnormalities, 47,XXY (Klinefelter syndrome [KS]) and 47,XYY, and characterize their risks of adverse health outcomes., Methods: We analyzed genotyping array or exome sequence data in 207,067 men of European ancestry aged 40 to 70 years from the UK Biobank and related these to extensive routine health record data., Results: Only 49 of 213 (23%) of men whom we identified with KS and only 1 of 143 (0.7%) with 47,XYY had a diagnosis of abnormal karyotype on their medical records or self-report. We observed expected associations for KS with reproductive dysfunction (late puberty: risk ratio [RR] = 2.7; childlessness: RR = 4.2; testosterone concentration: RR = -3.8 nmol/L, all P < 2 × 10
-8 ), whereas XYY men appeared to have normal reproductive function. Despite this difference, we identified several higher disease risks shared across both KS and 47,XYY, including type 2 diabetes (RR = 3.0 and 2.6, respectively), venous thrombosis (RR = 6.4 and 7.4, respectively), pulmonary embolism (RR = 3.3 and 3.7, respectively), and chronic obstructive pulmonary disease (RR = 4.4 and 4.6, respectively) (all P < 7 × 10-6 )., Conclusion: KS and 47,XYY were mostly unrecognized but conferred substantially higher risks for metabolic, vascular, and respiratory diseases, which were only partially explained by higher levels of body mass index, deprivation, and smoking., Competing Interests: Conflict of Interest The authors declare no conflicts of interest., (Copyright © 2022 The Authors. Published by Elsevier Inc. All rights reserved.)- Published
- 2022
- Full Text
- View/download PDF
8. Mitochondrial genetic variation is enriched in G-quadruplex regions that stall DNA synthesis in vitro.
- Author
-
Butler TJ, Estep KN, Sommers JA, Maul RW, Moore AZ, Bandinelli S, Cucca F, Tuke MA, Wood AR, Bharti SK, Bogenhagen DF, Yakubovskaya E, Garcia-Diaz M, Guilliam TA, Byrd AK, Raney KD, Doherty AJ, Ferrucci L, Schlessinger D, Ding J, and Brosh RM
- Subjects
- DNA, Mitochondrial genetics, Genome, Mitochondrial genetics, Guanine metabolism, Humans, Italy, Mitochondria genetics, Mutagenesis genetics, Mutation genetics, Nucleic Acid Conformation, Whole Genome Sequencing, DNA Helicases genetics, DNA Polymerase gamma genetics, DNA Primase genetics, DNA Replication genetics, DNA-Directed DNA Polymerase genetics, G-Quadruplexes, Multifunctional Enzymes genetics
- Abstract
As the powerhouses of the eukaryotic cell, mitochondria must maintain their genomes which encode proteins essential for energy production. Mitochondria are characterized by guanine-rich DNA sequences that spontaneously form unusual three-dimensional structures known as G-quadruplexes (G4). G4 structures can be problematic for the essential processes of DNA replication and transcription because they deter normal progression of the enzymatic-driven processes. In this study, we addressed the hypothesis that mitochondrial G4 is a source of mutagenesis leading to base-pair substitutions. Our computational analysis of 2757 individual genomes from two Italian population cohorts (SardiNIA and InCHIANTI) revealed a statistically significant enrichment of mitochondrial mutations within sequences corresponding to stable G4 DNA structures. Guided by the computational analysis results, we designed biochemical reconstitution experiments and demonstrated that DNA synthesis by two known mitochondrial DNA polymerases (Pol γ, PrimPol) in vitro was strongly blocked by representative stable G4 mitochondrial DNA structures, which could be overcome in a specific manner by the ATP-dependent G4-resolving helicase Pif1. However, error-prone DNA synthesis by PrimPol using the G4 template sequence persisted even in the presence of Pif1. Altogether, our results suggest that genetic variation is enriched in G-quadruplex regions that impede mitochondrial DNA replication., (© The Author(s) 2020. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.)
- Published
- 2020
- Full Text
- View/download PDF
9. Response to Prakash et al.
- Author
-
Tuke MA, Ruth KS, Wood AR, Beaumont RN, Tyrrell J, Jones SE, Yaghootkar H, Turner CLS, Donohoe ME, Brooke AM, Collinson MN, Freathy RM, Weedon MN, Frayling TM, and Murray A
- Subjects
- Adult, Humans, Penetrance, Syndrome, Turner Syndrome genetics
- Published
- 2019
- Full Text
- View/download PDF
10. Using genetics to understand the causal influence of higher BMI on depression.
- Author
-
Tyrrell J, Mulugeta A, Wood AR, Zhou A, Beaumont RN, Tuke MA, Jones SE, Ruth KS, Yaghootkar H, Sharp S, Thompson WD, Ji Y, Harrison J, Freathy RM, Murray A, Weedon MN, Lewis C, Frayling TM, and Hyppönen E
- Subjects
- Adult, Aged, Causality, Female, Humans, Male, Mendelian Randomization Analysis, Middle Aged, Obesity genetics, Obesity, Metabolically Benign epidemiology, Obesity, Metabolically Benign genetics, United Kingdom epidemiology, Body Mass Index, Depressive Disorder epidemiology, Obesity epidemiology
- Abstract
Background: Depression is more common in obese than non-obese individuals, especially in women, but the causal relationship between obesity and depression is complex and uncertain. Previous studies have used genetic variants associated with BMI to provide evidence that higher body mass index (BMI) causes depression, but have not tested whether this relationship is driven by the metabolic consequences of BMI nor for differences between men and women., Methods: We performed a Mendelian randomization study using 48 791 individuals with depression and 291 995 controls in the UK Biobank, to test for causal effects of higher BMI on depression (defined using self-report and Hospital Episode data). We used two genetic instruments, both representing higher BMI, but one with and one without its adverse metabolic consequences, in an attempt to 'uncouple' the psychological component of obesity from the metabolic consequences. We further tested causal relationships in men and women separately, and using subsets of BMI variants from known physiological pathways., Results: Higher BMI was strongly associated with higher odds of depression, especially in women. Mendelian randomization provided evidence that higher BMI partly causes depression. Using a 73-variant BMI genetic risk score, a genetically determined one standard deviation (1 SD) higher BMI (4.9 kg/m2) was associated with higher odds of depression in all individuals [odds ratio (OR): 1.18, 95% confidence interval (CI): 1.09, 1.28, P = 0.00007) and women only (OR: 1.24, 95% CI: 1.11, 1.39, P = 0.0001). Meta-analysis with 45 591 depression cases and 97 647 controls from the Psychiatric Genomics Consortium (PGC) strengthened the statistical confidence of the findings in all individuals. Similar effect size estimates were obtained using different Mendelian randomization methods, although not all reached P < 0.05. Using a metabolically favourable adiposity genetic risk score, and meta-analysing data from the UK biobank and PGC, a genetically determined 1 SD higher BMI (4.9 kg/m2) was associated with higher odds of depression in all individuals (OR: 1.26, 95% CI: 1.06, 1.50], P = 0.010), but with weaker statistical confidence., Conclusions: Higher BMI, with and without its adverse metabolic consequences, is likely to have a causal role in determining the likelihood of an individual developing depression., (© The Author(s) 2018. Published by Oxford University Press on behalf of the International Epidemiological Association.)
- Published
- 2019
- Full Text
- View/download PDF
11. Maternal and fetal genetic effects on birth weight and their relevance to cardio-metabolic risk factors.
- Author
-
Warrington NM, Beaumont RN, Horikoshi M, Day FR, Helgeland Ø, Laurin C, Bacelis J, Peng S, Hao K, Feenstra B, Wood AR, Mahajan A, Tyrrell J, Robertson NR, Rayner NW, Qiao Z, Moen GH, Vaudel M, Marsit CJ, Chen J, Nodzenski M, Schnurr TM, Zafarmand MH, Bradfield JP, Grarup N, Kooijman MN, Li-Gao R, Geller F, Ahluwalia TS, Paternoster L, Rueedi R, Huikari V, Hottenga JJ, Lyytikäinen LP, Cavadino A, Metrustry S, Cousminer DL, Wu Y, Thiering E, Wang CA, Have CT, Vilor-Tejedor N, Joshi PK, Painter JN, Ntalla I, Myhre R, Pitkänen N, van Leeuwen EM, Joro R, Lagou V, Richmond RC, Espinosa A, Barton SJ, Inskip HM, Holloway JW, Santa-Marina L, Estivill X, Ang W, Marsh JA, Reichetzeder C, Marullo L, Hocher B, Lunetta KL, Murabito JM, Relton CL, Kogevinas M, Chatzi L, Allard C, Bouchard L, Hivert MF, Zhang G, Muglia LJ, Heikkinen J, Morgen CS, van Kampen AHC, van Schaik BDC, Mentch FD, Langenberg C, Luan J, Scott RA, Zhao JH, Hemani G, Ring SM, Bennett AJ, Gaulton KJ, Fernandez-Tajes J, van Zuydam NR, Medina-Gomez C, de Haan HG, Rosendaal FR, Kutalik Z, Marques-Vidal P, Das S, Willemsen G, Mbarek H, Müller-Nurasyid M, Standl M, Appel EVR, Fonvig CE, Trier C, van Beijsterveldt CEM, Murcia M, Bustamante M, Bonas-Guarch S, Hougaard DM, Mercader JM, Linneberg A, Schraut KE, Lind PA, Medland SE, Shields BM, Knight BA, Chai JF, Panoutsopoulou K, Bartels M, Sánchez F, Stokholm J, Torrents D, Vinding RK, Willems SM, Atalay M, Chawes BL, Kovacs P, Prokopenko I, Tuke MA, Yaghootkar H, Ruth KS, Jones SE, Loh PR, Murray A, Weedon MN, Tönjes A, Stumvoll M, Michaelsen KF, Eloranta AM, Lakka TA, van Duijn CM, Kiess W, Körner A, Niinikoski H, Pahkala K, Raitakari OT, Jacobsson B, Zeggini E, Dedoussis GV, Teo YY, Saw SM, Montgomery GW, Campbell H, Wilson JF, Vrijkotte TGM, Vrijheid M, de Geus EJCN, Hayes MG, Kadarmideen HN, Holm JC, Beilin LJ, Pennell CE, Heinrich J, Adair LS, Borja JB, Mohlke KL, Eriksson JG, Widén EE, Hattersley AT, Spector TD, Kähönen M, Viikari JS, Lehtimäki T, Boomsma DI, Sebert S, Vollenweider P, Sørensen TIA, Bisgaard H, Bønnelykke K, Murray JC, Melbye M, Nohr EA, Mook-Kanamori DO, Rivadeneira F, Hofman A, Felix JF, Jaddoe VWV, Hansen T, Pisinger C, Vaag AA, Pedersen O, Uitterlinden AG, Järvelin MR, Power C, Hyppönen E, Scholtens DM, Lowe WL Jr, Davey Smith G, Timpson NJ, Morris AP, Wareham NJ, Hakonarson H, Grant SFA, Frayling TM, Lawlor DA, Njølstad PR, Johansson S, Ong KK, McCarthy MI, Perry JRB, Evans DM, and Freathy RM
- Subjects
- Adult, Blood Pressure genetics, Body Height genetics, Diabetes Mellitus, Type 2 etiology, Diabetes Mellitus, Type 2 genetics, Female, Fetal Development genetics, Genetic Predisposition to Disease, Genome-Wide Association Study, Heart Diseases etiology, Heart Diseases genetics, Humans, Infant, Newborn, Male, Maternal Inheritance genetics, Maternal-Fetal Exchange genetics, Metabolic Diseases etiology, Metabolic Diseases genetics, Models, Genetic, Polymorphism, Single Nucleotide, Pregnancy, Risk Factors, Birth Weight genetics
- Abstract
Birth weight variation is influenced by fetal and maternal genetic and non-genetic factors, and has been reproducibly associated with future cardio-metabolic health outcomes. In expanded genome-wide association analyses of own birth weight (n = 321,223) and offspring birth weight (n = 230,069 mothers), we identified 190 independent association signals (129 of which are novel). We used structural equation modeling to decompose the contributions of direct fetal and indirect maternal genetic effects, then applied Mendelian randomization to illuminate causal pathways. For example, both indirect maternal and direct fetal genetic effects drive the observational relationship between lower birth weight and higher later blood pressure: maternal blood pressure-raising alleles reduce offspring birth weight, but only direct fetal effects of these alleles, once inherited, increase later offspring blood pressure. Using maternal birth weight-lowering genotypes to proxy for an adverse intrauterine environment provided no evidence that it causally raises offspring blood pressure, indicating that the inverse birth weight-blood pressure association is attributable to genetic effects, and not to intrauterine programming.
- Published
- 2019
- Full Text
- View/download PDF
12. Genetic studies of accelerometer-based sleep measures yield new insights into human sleep behaviour.
- Author
-
Jones SE, van Hees VT, Mazzotti DR, Marques-Vidal P, Sabia S, van der Spek A, Dashti HS, Engmann J, Kocevska D, Tyrrell J, Beaumont RN, Hillsdon M, Ruth KS, Tuke MA, Yaghootkar H, Sharp SA, Ji Y, Harrison JW, Freathy RM, Murray A, Luik AI, Amin N, Lane JM, Saxena R, Rutter MK, Tiemeier H, Kutalik Z, Kumari M, Frayling TM, Weedon MN, Gehrman PR, and Wood AR
- Subjects
- Accelerometry methods, Circadian Rhythm, Humans, Polymorphism, Single Nucleotide, Serotonin genetics, Serotonin metabolism, Sleep Wake Disorders diagnosis, Waist-Hip Ratio, Polysomnography methods, Sleep genetics, Sleep Wake Disorders genetics
- Abstract
Sleep is an essential human function but its regulation is poorly understood. Using accelerometer data from 85,670 UK Biobank participants, we perform a genome-wide association study of 8 derived sleep traits representing sleep quality, quantity and timing, and validate our findings in 5,819 individuals. We identify 47 genetic associations at P < 5 × 10
-8 , of which 20 reach a stricter threshold of P < 8 × 10-10 . These include 26 novel associations with measures of sleep quality and 10 with nocturnal sleep duration. The majority of identified variants associate with a single sleep trait, except for variants previously associated with restless legs syndrome. For sleep duration we identify a missense variant (p.Tyr727Cys) in PDE11A as the likely causal variant. As a group, sleep quality loci are enriched for serotonin processing genes. Although accelerometer-derived measures of sleep are imperfect and may be affected by restless legs syndrome, these findings provide new biological insights into sleep compared to previous efforts based on self-report sleep measures.- Published
- 2019
- Full Text
- View/download PDF
13. Mosaic Turner syndrome shows reduced penetrance in an adult population study.
- Author
-
Tuke MA, Ruth KS, Wood AR, Beaumont RN, Tyrrell J, Jones SE, Yaghootkar H, Turner CLS, Donohoe ME, Brooke AM, Collinson MN, Freathy RM, Weedon MN, Frayling TM, and Murray A
- Subjects
- Adult, Aged, Aneuploidy, Female, Humans, Karyotype, Middle Aged, Penetrance, Phenotype, Polymorphism, Single Nucleotide genetics, Trisomy, Turner Syndrome pathology, United Kingdom, Chromosomes, Human, X genetics, Genetics, Population, Mosaicism, Turner Syndrome genetics
- Abstract
Purpose: Many women with X chromosome aneuploidy undergo lifetime clinical monitoring for possible complications. However, ascertainment of cases in the clinic may mean that the penetrance has been overestimated., Methods: We characterized the prevalence and phenotypic consequences of X chromosome aneuploidy in a population of 244,848 women over 40 years of age from UK Biobank, using single-nucleotide polymorphism (SNP) array data., Results: We detected 30 women with 45,X; 186 with mosaic 45,X/46,XX; and 110 with 47,XXX. The prevalence of nonmosaic 45,X (12/100,000) and 47,XXX (45/100,000) was lower than expected, but was higher for mosaic 45,X/46,XX (76/100,000). The characteristics of women with 45,X were consistent with the characteristics of a clinically recognized Turner syndrome phenotype, including short stature and primary amenorrhea. In contrast, women with mosaic 45,X/46,XX were less short, had a normal reproductive lifespan and birth rate, and no reported cardiovascular complications. The phenotype of women with 47,XXX included taller stature (5.3 cm; SD = 5.52 cm; P = 5.8 × 10
-20 ) and earlier menopause age (5.12 years; SD = 5.1 years; P = 1.2 × 10-14 )., Conclusion: Our results suggest that the clinical management of women with 45,X/46,XX mosaicism should be minimal, particularly those identified incidentally.- Published
- 2019
- Full Text
- View/download PDF
14. Genome-wide association analyses of chronotype in 697,828 individuals provides insights into circadian rhythms.
- Author
-
Jones SE, Lane JM, Wood AR, van Hees VT, Tyrrell J, Beaumont RN, Jeffries AR, Dashti HS, Hillsdon M, Ruth KS, Tuke MA, Yaghootkar H, Sharp SA, Jie Y, Thompson WD, Harrison JW, Dawes A, Byrne EM, Tiemeier H, Allebrandt KV, Bowden J, Ray DW, Freathy RM, Murray A, Mazzotti DR, Gehrman PR, Lawlor DA, Frayling TM, Rutter MK, Hinds DA, Saxena R, and Weedon MN
- Subjects
- Adult, Aged, Cyclic AMP metabolism, Female, Genetic Loci, Glutamic Acid metabolism, Humans, Male, Middle Aged, Sleep, United Kingdom, Circadian Rhythm, Genome-Wide Association Study, White People genetics
- Abstract
Being a morning person is a behavioural indicator of a person's underlying circadian rhythm. Using genome-wide data from 697,828 UK Biobank and 23andMe participants we increase the number of genetic loci associated with being a morning person from 24 to 351. Using data from 85,760 individuals with activity-monitor derived measures of sleep timing we find that the chronotype loci associate with sleep timing: the mean sleep timing of the 5% of individuals carrying the most morningness alleles is 25 min earlier than the 5% carrying the fewest. The loci are enriched for genes involved in circadian regulation, cAMP, glutamate and insulin signalling pathways, and those expressed in the retina, hindbrain, hypothalamus, and pituitary. Using Mendelian Randomisation, we show that being a morning person is causally associated with better mental health but does not affect BMI or risk of Type 2 diabetes. This study offers insights into circadian biology and its links to disease in humans.
- Published
- 2019
- Full Text
- View/download PDF
15. Genome-Wide and Abdominal MRI Data Provide Evidence That a Genetically Determined Favorable Adiposity Phenotype Is Characterized by Lower Ectopic Liver Fat and Lower Risk of Type 2 Diabetes, Heart Disease, and Hypertension.
- Author
-
Ji Y, Yiorkas AM, Frau F, Mook-Kanamori D, Staiger H, Thomas EL, Atabaki-Pasdar N, Campbell A, Tyrrell J, Jones SE, Beaumont RN, Wood AR, Tuke MA, Ruth KS, Mahajan A, Murray A, Freathy RM, Weedon MN, Hattersley AT, Hayward C, Machann J, Häring HU, Franks P, de Mutsert R, Pearson E, Stefan N, Frayling TM, Allebrandt KV, Bell JD, Blakemore AI, and Yaghootkar H
- Subjects
- Adiposity genetics, Adiposity physiology, Adult, Aged, Diabetes Mellitus, Type 2 physiopathology, Female, Genome-Wide Association Study, Heart Diseases physiopathology, Humans, Hypertension diagnostic imaging, Hypertension genetics, Hypertension physiopathology, Intra-Abdominal Fat metabolism, Male, Middle Aged, Obesity diagnostic imaging, Obesity genetics, Obesity physiopathology, Waist-Hip Ratio, Diabetes Mellitus, Type 2 diagnostic imaging, Diabetes Mellitus, Type 2 genetics, Heart Diseases diagnostic imaging, Heart Diseases genetics, Magnetic Resonance Imaging methods
- Abstract
Recent genetic studies have identified alleles associated with opposite effects on adiposity and risk of type 2 diabetes. We aimed to identify more of these variants and test the hypothesis that such favorable adiposity alleles are associated with higher subcutaneous fat and lower ectopic fat. We combined MRI data with genome-wide association studies of body fat percentage (%) and metabolic traits. We report 14 alleles, including 7 newly characterized alleles, associated with higher adiposity but a favorable metabolic profile. Consistent with previous studies, individuals carrying more favorable adiposity alleles had higher body fat % and higher BMI but lower risk of type 2 diabetes, heart disease, and hypertension. These individuals also had higher subcutaneous fat but lower liver fat and a lower visceral-to-subcutaneous adipose tissue ratio. Individual alleles associated with higher body fat % but lower liver fat and lower risk of type 2 diabetes included those in PPARG , GRB14 , and IRS1 , whereas the allele in ANKRD55 was paradoxically associated with higher visceral fat but lower risk of type 2 diabetes. Most identified favorable adiposity alleles are associated with higher subcutaneous and lower liver fat, a mechanism consistent with the beneficial effects of storing excess triglycerides in metabolically low-risk depots., (© 2018 by the American Diabetes Association.)
- Published
- 2019
- Full Text
- View/download PDF
16. A Common Allele in FGF21 Associated with Sugar Intake Is Associated with Body Shape, Lower Total Body-Fat Percentage, and Higher Blood Pressure.
- Author
-
Frayling TM, Beaumont RN, Jones SE, Yaghootkar H, Tuke MA, Ruth KS, Casanova F, West B, Locke J, Sharp S, Ji Y, Thompson W, Harrison J, Etheridge AS, Gallins PJ, Jima D, Wright F, Zhou Y, Innocenti F, Lindgren CM, Grarup N, Murray A, Freathy RM, Weedon MN, Tyrrell J, and Wood AR
- Subjects
- Adult, Aged, Alcohol Drinking, Alleles, Body Mass Index, Body Size, Databases, Factual, Diabetes Mellitus, Type 2 genetics, Diabetes Mellitus, Type 2 pathology, Diet, High-Fat, Genome-Wide Association Study, Humans, Middle Aged, Phenotype, Polymorphism, Single Nucleotide, United Kingdom, Blood Pressure, Body Fat Distribution, Fibroblast Growth Factors genetics, Sugars metabolism
- Abstract
Fibroblast growth factor 21 (FGF21) is a hormone that has insulin-sensitizing properties. Some trials of FGF21 analogs show weight loss and lipid-lowering effects. Recent studies have shown that a common allele in the FGF21 gene alters the balance of macronutrients consumed, but there was little evidence of an effect on metabolic traits. We studied a common FGF21 allele (A:rs838133) in 451,099 people from the UK Biobank study, aiming to use the human allele to inform potential adverse and beneficial effects of targeting FGF21. We replicated the association between the A allele and higher percentage carbohydrate intake. We then showed that this allele is more strongly associated with higher blood pressure and waist-hip ratio, despite an association with lower total body-fat percentage, than it is with BMI or type 2 diabetes. These human phenotypes of variation in the FGF21 gene will inform research into FGF21's mechanisms and therapeutic potential., (Copyright © 2018 The Authors. Published by Elsevier Inc. All rights reserved.)
- Published
- 2018
- Full Text
- View/download PDF
17. Genome-wide association study of offspring birth weight in 86 577 women identifies five novel loci and highlights maternal genetic effects that are independent of fetal genetics.
- Author
-
Beaumont RN, Warrington NM, Cavadino A, Tyrrell J, Nodzenski M, Horikoshi M, Geller F, Myhre R, Richmond RC, Paternoster L, Bradfield JP, Kreiner-Møller E, Huikari V, Metrustry S, Lunetta KL, Painter JN, Hottenga JJ, Allard C, Barton SJ, Espinosa A, Marsh JA, Potter C, Zhang G, Ang W, Berry DJ, Bouchard L, Das S, Hakonarson H, Heikkinen J, Helgeland Ø, Hocher B, Hofman A, Inskip HM, Jones SE, Kogevinas M, Lind PA, Marullo L, Medland SE, Murray A, Murray JC, Njølstad PR, Nohr EA, Reichetzeder C, Ring SM, Ruth KS, Santa-Marina L, Scholtens DM, Sebert S, Sengpiel V, Tuke MA, Vaudel M, Weedon MN, Willemsen G, Wood AR, Yaghootkar H, Muglia LJ, Bartels M, Relton CL, Pennell CE, Chatzi L, Estivill X, Holloway JW, Boomsma DI, Montgomery GW, Murabito JM, Spector TD, Power C, Järvelin MR, Bisgaard H, Grant SFA, Sørensen TIA, Jaddoe VW, Jacobsson B, Melbye M, McCarthy MI, Hattersley AT, Hayes MG, Frayling TM, Hivert MF, Felix JF, Hyppönen E, Lowe WL Jr, Evans DM, Lawlor DA, Feenstra B, and Freathy RM
- Subjects
- Actins genetics, Adaptor Proteins, Signal Transducing, Alleles, Birth Weight physiology, Cytochrome P-450 CYP3A genetics, DNA-Binding Proteins genetics, Female, Genetic Variation genetics, Genotype, Germinal Center Kinases, Gestational Age, HMGA2 Protein genetics, Humans, Intracellular Signaling Peptides and Proteins, Kv1.3 Potassium Channel genetics, Protein Serine-Threonine Kinases genetics, Proteins genetics, Receptor, Melatonin, MT2 genetics, Trans-Activators genetics, Transcription Factor 7-Like 2 Protein genetics, Birth Weight genetics, Genome-Wide Association Study methods, Polymorphism, Single Nucleotide genetics
- Abstract
Genome-wide association studies of birth weight have focused on fetal genetics, whereas relatively little is known about the role of maternal genetic variation. We aimed to identify maternal genetic variants associated with birth weight that could highlight potentially relevant maternal determinants of fetal growth. We meta-analysed data on up to 8.7 million SNPs in up to 86 577 women of European descent from the Early Growth Genetics (EGG) Consortium and the UK Biobank. We used structural equation modelling (SEM) and analyses of mother-child pairs to quantify the separate maternal and fetal genetic effects. Maternal SNPs at 10 loci (MTNR1B, HMGA2, SH2B3, KCNAB1, L3MBTL3, GCK, EBF1, TCF7L2, ACTL9, CYP3A7) were associated with offspring birth weight at P < 5 × 10-8. In SEM analyses, at least 7 of the 10 associations were consistent with effects of the maternal genotype acting via the intrauterine environment, rather than via effects of shared alleles with the fetus. Variants, or correlated proxies, at many of the loci had been previously associated with adult traits, including fasting glucose (MTNR1B, GCK and TCF7L2) and sex hormone levels (CYP3A7), and one (EBF1) with gestational duration. The identified associations indicate that genetic effects on maternal glucose, cytochrome P450 activity and gestational duration, and potentially on maternal blood pressure and immune function, are relevant for fetal growth. Further characterization of these associations in mechanistic and causal analyses will enhance understanding of the potentially modifiable maternal determinants of fetal growth, with the goal of reducing the morbidity and mortality associated with low and high birth weights., (© The Author(s) 2018. Published by Oxford University Press.)
- Published
- 2018
- Full Text
- View/download PDF
18. Influence of cell distribution and diabetes status on the association between mitochondrial DNA copy number and aging phenotypes in the InCHIANTI study.
- Author
-
Moore AZ, Ding J, Tuke MA, Wood AR, Bandinelli S, Frayling TM, and Ferrucci L
- Subjects
- Adult, Aged, Aged, 80 and over, Diabetes Mellitus genetics, Female, Humans, Leukocytes metabolism, Male, Middle Aged, Mitochondria metabolism, Risk Factors, Aging, DNA Copy Number Variations genetics, DNA, Mitochondrial genetics, Diabetes Mellitus pathology, Phenotype
- Abstract
Mitochondrial DNA copy number (mtDNA-CN) estimated in whole blood is a novel marker of mitochondrial mass and function that can be used in large population-based studies. Analyses that attempt to relate mtDNA-CN to specific aging phenotypes may be confounded by differences in the distribution of blood cell types across samples. Also, low or high mtDNA-CN may have a different meaning given the presence of diseases associated with mitochondrial damage. We evaluated the impact of blood cell type distribution and diabetes status on the association between mtDNA-CN and aging phenotypes, namely chronologic age, interleukin-6, hemoglobin, and all-cause mortality, among 672 participants of the InCHIANTI study. After accounting for white blood cell count, platelet count, and white blood cell proportions in multivariate models, associations of mtDNA-CN with age and interleukin-6 were no longer statistically significant. Evaluation of a statistical interaction by diabetes status suggested heterogeneity of effects in the analysis of mortality (P < 0.01). The magnitude and direction of associations between mtDNA-CN estimated from blood samples and aging phenotypes are influenced by the sample cell type distribution and disease status. Therefore, accounting for these factors may aid understanding of the relevance of mitochondrial DNA copy number to health and aging., (© 2017 The Authors. Aging Cell published by the Anatomical Society and John Wiley & Sons Ltd.)
- Published
- 2018
- Full Text
- View/download PDF
19. CNV-association meta-analysis in 191,161 European adults reveals new loci associated with anthropometric traits.
- Author
-
Macé A, Tuke MA, Deelen P, Kristiansson K, Mattsson H, Nõukas M, Sapkota Y, Schick U, Porcu E, Rüeger S, McDaid AF, Porteous D, Winkler TW, Salvi E, Shrine N, Liu X, Ang WQ, Zhang W, Feitosa MF, Venturini C, van der Most PJ, Rosengren A, Wood AR, Beaumont RN, Jones SE, Ruth KS, Yaghootkar H, Tyrrell J, Havulinna AS, Boers H, Mägi R, Kriebel J, Müller-Nurasyid M, Perola M, Nieminen M, Lokki ML, Kähönen M, Viikari JS, Geller F, Lahti J, Palotie A, Koponen P, Lundqvist A, Rissanen H, Bottinger EP, Afaq S, Wojczynski MK, Lenzini P, Nolte IM, Sparsø T, Schupf N, Christensen K, Perls TT, Newman AB, Werge T, Snieder H, Spector TD, Chambers JC, Koskinen S, Melbye M, Raitakari OT, Lehtimäki T, Tobin MD, Wain LV, Sinisalo J, Peters A, Meitinger T, Martin NG, Wray NR, Montgomery GW, Medland SE, Swertz MA, Vartiainen E, Borodulin K, Männistö S, Murray A, Bochud M, Jacquemont S, Rivadeneira F, Hansen TF, Oldehinkel AJ, Mangino M, Province MA, Deloukas P, Kooner JS, Freathy RM, Pennell C, Feenstra B, Strachan DP, Lettre G, Hirschhorn J, Cusi D, Heid IM, Hayward C, Männik K, Beckmann JS, Loos RJF, Nyholt DR, Metspalu A, Eriksson JG, Weedon MN, Salomaa V, Franke L, Reymond A, Frayling TM, and Kutalik Z
- Subjects
- Anthropometry, Body Mass Index, Body Size genetics, Chromosomes, Human, Pair 1 genetics, Chromosomes, Human, Pair 11 genetics, Chromosomes, Human, Pair 16 genetics, Chromosomes, Human, Pair 18 genetics, Chromosomes, Human, Pair 22 genetics, Chromosomes, Human, Pair 3 genetics, Chromosomes, Human, Pair 7 genetics, DNA Copy Number Variations, Genome-Wide Association Study, Genotype, Humans, Phenotype, Waist-Hip Ratio, Body Height genetics, Body Weight genetics, White People genetics
- Abstract
There are few examples of robust associations between rare copy number variants (CNVs) and complex continuous human traits. Here we present a large-scale CNV association meta-analysis on anthropometric traits in up to 191,161 adult samples from 26 cohorts. The study reveals five CNV associations at 1q21.1, 3q29, 7q11.23, 11p14.2, and 18q21.32 and confirms two known loci at 16p11.2 and 22q11.21, implicating at least one anthropometric trait. The discovered CNVs are recurrent and rare (0.01-0.2%), with large effects on height (>2.4 cm), weight (>5 kg), and body mass index (BMI) (>3.5 kg/m
2 ). Burden analysis shows a 0.41 cm decrease in height, a 0.003 increase in waist-to-hip ratio and increase in BMI by 0.14 kg/m2 for each Mb of total deletion burden (P = 2.5 × 10-10 , 6.0 × 10-5 , and 2.9 × 10-3 ). Our study provides evidence that the same genes (e.g., MC4R, FIBIN, and FMO5) harbor both common and rare variants affecting body size and that anthropometric traits share genetic loci with developmental and psychiatric disorders.Individual SNPs have small effects on anthropometric traits, yet the impact of CNVs has remained largely unknown. Here, Kutalik and co-workers perform a large-scale genome-wide meta-analysis of structural variation and find rare CNVs associated with height, weight and BMI with large effect sizes.- Published
- 2017
- Full Text
- View/download PDF
20. Red blood cell distribution width: Genetic evidence for aging pathways in 116,666 volunteers.
- Author
-
Pilling LC, Atkins JL, Duff MO, Beaumont RN, Jones SE, Tyrrell J, Kuo CL, Ruth KS, Tuke MA, Yaghootkar H, Wood AR, Murray A, Weedon MN, Harries LW, Kuchel GA, Ferrucci L, Frayling TM, and Melzer D
- Subjects
- Adult, Aged, Biological Specimen Banks, Female, Gene Ontology, Genetic Predisposition to Disease, Genetic Variation, Genome-Wide Association Study, Genotype, Healthy Volunteers, Humans, Male, Middle Aged, United Kingdom, Aging blood, Aging genetics, Erythrocyte Indices genetics, Signal Transduction genetics
- Abstract
Introduction: Variability in red blood cell volumes (distribution width, RDW) increases with age and is strongly predictive of mortality, incident coronary heart disease and cancer. We investigated inherited genetic variation associated with RDW in 116,666 UK Biobank human volunteers., Results: A large proportion RDW is explained by genetic variants (29%), especially in the older group (60+ year olds, 33.8%, <50 year olds, 28.4%). RDW was associated with 194 independent genetic signals; 71 are known for conditions including autoimmune disease, certain cancers, BMI, Alzheimer's disease, longevity, age at menopause, bone density, myositis, Parkinson's disease, and age-related macular degeneration. Exclusion of anemic participants did not affect the overall findings. Pathways analysis showed enrichment for telomere maintenance, ribosomal RNA, and apoptosis. The majority of RDW-associated signals were intronic (119 of 194), including SNP rs6602909 located in an intron of oncogene GAS6, an eQTL in whole blood., Conclusions: Although increased RDW is predictive of cardiovascular outcomes, this was not explained by known CVD or related lipid genetic risks, and a RDW genetic score was not predictive of incident disease. The predictive value of RDW for a range of negative health outcomes may in part be due to variants influencing fundamental pathways of aging.
- Published
- 2017
- Full Text
- View/download PDF
21. Gene-obesogenic environment interactions in the UK Biobank study.
- Author
-
Tyrrell J, Wood AR, Ames RM, Yaghootkar H, Beaumont RN, Jones SE, Tuke MA, Ruth KS, Freathy RM, Davey Smith G, Joost S, Guessous I, Murray A, Strachan DP, Kutalik Z, Weedon MN, and Frayling TM
- Subjects
- Adult, Aged, Biological Specimen Banks, Environment, Female, Genetic Predisposition to Disease, Genetic Variation, Humans, Male, Middle Aged, Regression Analysis, Risk Factors, Sedentary Behavior, United Kingdom, Body Mass Index, Diet, Exercise, Gene-Environment Interaction, Obesity genetics
- Abstract
Background: Previous studies have suggested that modern obesogenic environments accentuate the genetic risk of obesity. However, these studies have proven controversial as to which, if any, measures of the environment accentuate genetic susceptibility to high body mass index (BMI)., Methods: We used up to 120 000 adults from the UK Biobank study to test the hypothesis that high-risk obesogenic environments and behaviours accentuate genetic susceptibility to obesity. We used BMI as the outcome and a 69-variant genetic risk score (GRS) for obesity and 12 measures of the obesogenic environment as exposures. These measures included Townsend deprivation index (TDI) as a measure of socio-economic position, TV watching, a 'Westernized' diet and physical activity. We performed several negative control tests, including randomly selecting groups of different average BMIs, using a simulated environment and including sun-protection use as an environment., Results: We found gene-environment interactions with TDI (Pinteraction = 3 × 10 -10 ), self-reported TV watching (Pinteraction = 7 × 10 -5 ) and self-reported physical activity (Pinteraction = 5 × 10 -6 ). Within the group of 50% living in the most relatively deprived situations, carrying 10 additional BMI-raising alleles was associated with approximately 3.8 kg extra weight in someone 1.73 m tall. In contrast, within the group of 50% living in the least deprivation, carrying 10 additional BMI-raising alleles was associated with approximately 2.9 kg extra weight. The interactions were weaker, but present, with the negative controls, including sun-protection use, indicating that residual confounding is likely., Conclusions: Our findings suggest that the obesogenic environment accentuates the risk of obesity in genetically susceptible adults. Of the factors we tested, relative social deprivation best captures the aspects of the obesogenic environment responsible., (© The Author 2017. Published by Oxford University Press on behalf of the International Epidemiological Association)
- Published
- 2017
- Full Text
- View/download PDF
22. Quantifying the extent to which index event biases influence large genetic association studies.
- Author
-
Yaghootkar H, Bancks MP, Jones SE, McDaid A, Beaumont R, Donnelly L, Wood AR, Campbell A, Tyrrell J, Hocking LJ, Tuke MA, Ruth KS, Pearson ER, Murray A, Freathy RM, Munroe PB, Hayward C, Palmer C, Weedon MN, Pankow JS, Frayling TM, and Kutalik Z
- Subjects
- Alleles, Blood Glucose genetics, Body Mass Index, Genotype, Humans, Hypertension pathology, Obesity genetics, Polymorphism, Single Nucleotide, Diabetes Mellitus, Type 2 genetics, Genetic Association Studies, Genetic Predisposition to Disease, Hypertension genetics
- Abstract
As genetic association studies increase in size to 100 000s of individuals, subtle biases may influence conclusions. One possible bias is 'index event bias' (IEB) that appears due to the stratification by, or enrichment for, disease status when testing associations between genetic variants and a disease-associated trait. We aimed to test the extent to which IEB influences some known trait associations in a range of study designs and provide a statistical framework for assessing future associations. Analyzing data from 113 203 non-diabetic UK Biobank participants, we observed three (near TCF7L2, CDKN2AB and CDKAL1) overestimated (body mass index (BMI) decreasing) and one (near MTNR1B) underestimated (BMI increasing) associations among 11 type 2 diabetes risk alleles (at P < 0.05). IEB became even stronger when we tested a type 2 diabetes genetic risk score composed of these 11 variants (-0.010 standard deviations BMI per allele, P = 5 × 10- 4), which was confirmed in four additional independent studies. Similar results emerged when examining the effect of blood pressure increasing alleles on BMI in normotensive UK Biobank samples. Furthermore, we demonstrated that, under realistic scenarios, common disease alleles would become associated at P < 5 × 10- 8 with disease-related traits through IEB alone, if disease prevalence in the sample differs appreciably from the background population prevalence. For example, some hypertension and type 2 diabetes alleles will be associated with BMI in sample sizes of >500 000 if the prevalence of those diseases differs by >10% from the background population. In conclusion, IEB may result in false positive or negative genetic associations in very large studies stratified or strongly enriched for/against disease cases., (© The Author 2016. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.)
- Published
- 2017
- Full Text
- View/download PDF
23. New quality measure for SNP array based CNV detection.
- Author
-
Macé A, Tuke MA, Beckmann JS, Lin L, Jacquemont S, Weedon MN, Reymond A, and Kutalik Z
- Subjects
- Genome-Wide Association Study, Humans, DNA Copy Number Variations, Polymorphism, Single Nucleotide, Software
- Abstract
Motivation: Only a few large systematic studies have evaluated the impact of copy number variants (CNVs) on common diseases. Several million individuals have been genotyped on single nucleotide variation arrays, which could be used for genome-wide CNVs association studies. However, CNV calls remain prone to false positives and only empirical filtering strategies exist in the literature. To overcome this issue, we defined a new quality score (QS) estimating the probability of a CNV called by PennCNV to be confirmed by other software., Results: Out-of-sample comparison showed that the correlation between the consensus CNV status and the QS is twice as high as it is for any previously proposed CNV filters. ROC curves displayed an AUC higher than 0.8 and simulations showed an increase up to 20% in statistical power when using QS in comparison to other filtering strategies. Superior performance was confirmed also for alternative consensus CNV definition and through improving known CNV-trait associations., Availability and Implementation: http://goo.gl/T6yuFM CONTACT: zoltan.kutalik@unil.ch or aurelien@mace@unil.chSupplementary information: Supplementary data are available at Bioinformatics online., (© The Author 2016. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oup.com.)
- Published
- 2016
- Full Text
- View/download PDF
24. Genome-wide associations for birth weight and correlations with adult disease.
- Author
-
Horikoshi M, Beaumont RN, Day FR, Warrington NM, Kooijman MN, Fernandez-Tajes J, Feenstra B, van Zuydam NR, Gaulton KJ, Grarup N, Bradfield JP, Strachan DP, Li-Gao R, Ahluwalia TS, Kreiner E, Rueedi R, Lyytikäinen LP, Cousminer DL, Wu Y, Thiering E, Wang CA, Have CT, Hottenga JJ, Vilor-Tejedor N, Joshi PK, Boh ETH, Ntalla I, Pitkänen N, Mahajan A, van Leeuwen EM, Joro R, Lagou V, Nodzenski M, Diver LA, Zondervan KT, Bustamante M, Marques-Vidal P, Mercader JM, Bennett AJ, Rahmioglu N, Nyholt DR, Ma RCW, Tam CHT, Tam WH, Ganesh SK, van Rooij FJ, Jones SE, Loh PR, Ruth KS, Tuke MA, Tyrrell J, Wood AR, Yaghootkar H, Scholtens DM, Paternoster L, Prokopenko I, Kovacs P, Atalay M, Willems SM, Panoutsopoulou K, Wang X, Carstensen L, Geller F, Schraut KE, Murcia M, van Beijsterveldt CE, Willemsen G, Appel EVR, Fonvig CE, Trier C, Tiesler CM, Standl M, Kutalik Z, Bonas-Guarch S, Hougaard DM, Sánchez F, Torrents D, Waage J, Hollegaard MV, de Haan HG, Rosendaal FR, Medina-Gomez C, Ring SM, Hemani G, McMahon G, Robertson NR, Groves CJ, Langenberg C, Luan J, Scott RA, Zhao JH, Mentch FD, MacKenzie SM, Reynolds RM, Lowe WL Jr, Tönjes A, Stumvoll M, Lindi V, Lakka TA, van Duijn CM, Kiess W, Körner A, Sørensen TI, Niinikoski H, Pahkala K, Raitakari OT, Zeggini E, Dedoussis GV, Teo YY, Saw SM, Melbye M, Campbell H, Wilson JF, Vrijheid M, de Geus EJ, Boomsma DI, Kadarmideen HN, Holm JC, Hansen T, Sebert S, Hattersley AT, Beilin LJ, Newnham JP, Pennell CE, Heinrich J, Adair LS, Borja JB, Mohlke KL, Eriksson JG, Widén EE, Kähönen M, Viikari JS, Lehtimäki T, Vollenweider P, Bønnelykke K, Bisgaard H, Mook-Kanamori DO, Hofman A, Rivadeneira F, Uitterlinden AG, Pisinger C, Pedersen O, Power C, Hyppönen E, Wareham NJ, Hakonarson H, Davies E, Walker BR, Jaddoe VW, Jarvelin MR, Grant SF, Vaag AA, Lawlor DA, Frayling TM, Davey Smith G, Morris AP, Ong KK, Felix JF, Timpson NJ, Perry JR, Evans DM, McCarthy MI, and Freathy RM
- Subjects
- Adult, Anthropometry, Blood Pressure genetics, Chromatin Assembly and Disassembly, Cohort Studies, Datasets as Topic, Female, Genetic Loci genetics, Genetic Variation genetics, Genomic Imprinting genetics, Genotype, Glucose metabolism, Glycogen biosynthesis, Humans, Insulin metabolism, Male, Phenotype, Signal Transduction, Aging genetics, Birth Weight genetics, Coronary Artery Disease genetics, Diabetes Mellitus, Type 2 genetics, Fetus metabolism, Genetic Predisposition to Disease, Genome-Wide Association Study
- Abstract
Birth weight (BW) has been shown to be influenced by both fetal and maternal factors and in observational studies is reproducibly associated with future risk of adult metabolic diseases including type 2 diabetes (T2D) and cardiovascular disease. These life-course associations have often been attributed to the impact of an adverse early life environment. Here, we performed a multi-ancestry genome-wide association study (GWAS) meta-analysis of BW in 153,781 individuals, identifying 60 loci where fetal genotype was associated with BW (P < 5 × 10
-8 ). Overall, approximately 15% of variance in BW was captured by assays of fetal genetic variation. Using genetic association alone, we found strong inverse genetic correlations between BW and systolic blood pressure (Rg = -0.22, P = 5.5 × 10-13 ), T2D (Rg = -0.27, P = 1.1 × 10-6 ) and coronary artery disease (Rg = -0.30, P = 6.5 × 10-9 ). In addition, using large -cohort datasets, we demonstrated that genetic factors were the major contributor to the negative covariance between BW and future cardiometabolic risk. Pathway analyses indicated that the protein products of genes within BW-associated regions were enriched for diverse processes including insulin signalling, glucose homeostasis, glycogen biosynthesis and chromatin remodelling. There was also enrichment of associations with BW in known imprinted regions (P = 1.9 × 10-4 ). We demonstrate that life-course associations between early growth phenotypes and adult cardiometabolic disease are in part the result of shared genetic effects and identify some of the pathways through which these causal genetic effects are mediated., Competing Interests: One of the authors discloses competing financial interests: Krina Zondervan has a scientific collaboration with Bayer HealthCare Ltd. and Population Diagnostics Inc.- Published
- 2016
- Full Text
- View/download PDF
25. Genome-Wide Association Analyses in 128,266 Individuals Identifies New Morningness and Sleep Duration Loci.
- Author
-
Jones SE, Tyrrell J, Wood AR, Beaumont RN, Ruth KS, Tuke MA, Yaghootkar H, Hu Y, Teder-Laving M, Hayward C, Roenneberg T, Wilson JF, Del Greco F, Hicks AA, Shin C, Yun CH, Lee SK, Metspalu A, Byrne EM, Gehrman PR, Tiemeier H, Allebrandt KV, Freathy RM, Murray A, Hinds DA, Frayling TM, and Weedon MN
- Subjects
- Body Mass Index, Diabetes Mellitus, Type 2 pathology, Female, Genome-Wide Association Study, Humans, Male, Mendelian Randomization Analysis, Obesity genetics, Obesity pathology, Sleep physiology, White People, Circadian Rhythm genetics, Diabetes Mellitus, Type 2 genetics, PAX8 Transcription Factor genetics, Protein Serine-Threonine Kinases genetics, Sleep genetics
- Abstract
Disrupted circadian rhythms and reduced sleep duration are associated with several human diseases, particularly obesity and type 2 diabetes, but until recently, little was known about the genetic factors influencing these heritable traits. We performed genome-wide association studies of self-reported chronotype (morning/evening person) and self-reported sleep duration in 128,266 white British individuals from the UK Biobank study. Sixteen variants were associated with chronotype (P<5x10-8), including variants near the known circadian rhythm genes RGS16 (1.21 odds of morningness, 95% CI [1.15, 1.27], P = 3x10-12) and PER2 (1.09 odds of morningness, 95% CI [1.06, 1.12], P = 4x10-10). The PER2 signal has previously been associated with iris function. We sought replication using self-reported data from 89,283 23andMe participants; thirteen of the chronotype signals remained associated at P<5x10-8 on meta-analysis and eleven of these reached P<0.05 in the same direction in the 23andMe study. We also replicated 9 additional variants identified when the 23andMe study was used as a discovery GWAS of chronotype (all P<0.05 and meta-analysis P<5x10-8). For sleep duration, we replicated one known signal in PAX8 (2.6 minutes per allele, 95% CI [1.9, 3.2], P = 5.7x10-16) and identified and replicated two novel associations at VRK2 (2.0 minutes per allele, 95% CI [1.3, 2.7], P = 1.2x10-9; and 1.6 minutes per allele, 95% CI [1.1, 2.2], P = 7.6x10-9). Although we found genetic correlation between chronotype and BMI (rG = 0.056, P = 0.05); undersleeping and BMI (rG = 0.147, P = 1x10-5) and oversleeping and BMI (rG = 0.097, P = 0.04), Mendelian Randomisation analyses, with limited power, provided no consistent evidence of causal associations between BMI or type 2 diabetes and chronotype or sleep duration. Our study brings the total number of loci associated with chronotype to 22 and with sleep duration to three, and provides new insights into the biology of sleep and circadian rhythms in humans.
- Published
- 2016
- Full Text
- View/download PDF
26. Genetic Evidence for a Link Between Favorable Adiposity and Lower Risk of Type 2 Diabetes, Hypertension, and Heart Disease.
- Author
-
Yaghootkar H, Lotta LA, Tyrrell J, Smit RA, Jones SE, Donnelly L, Beaumont R, Campbell A, Tuke MA, Hayward C, Ruth KS, Padmanabhan S, Jukema JW, Palmer CC, Hattersley A, Freathy RM, Langenberg C, Wareham NJ, Wood AR, Murray A, Weedon MN, Sattar N, Pearson E, Scott RA, and Frayling TM
- Subjects
- Adiposity genetics, Adult, Aged, Body Mass Index, Diabetes Mellitus, Type 2 etiology, Female, Genetic Predisposition to Disease genetics, Heart Diseases etiology, Heart Diseases genetics, Humans, Hypertension etiology, Hypertension genetics, Male, Middle Aged, Obesity etiology, Obesity genetics, Odds Ratio, Risk Factors, Sex Factors, Waist Circumference, Waist-Hip Ratio, Adiposity physiology, Diabetes Mellitus, Type 2 epidemiology, Diabetes Mellitus, Type 2 genetics, Heart Diseases epidemiology, Hypertension epidemiology, Obesity epidemiology
- Abstract
Recent genetic studies have identified some alleles that are associated with higher BMI but lower risk of type 2 diabetes, hypertension, and heart disease. These "favorable adiposity" alleles are collectively associated with lower insulin levels and higher subcutaneous-to-visceral adipose tissue ratio and may protect from disease through higher adipose storage capacity. We aimed to use data from 164,609 individuals from the UK Biobank and five other studies to replicate associations between a genetic score of 11 favorable adiposity variants and adiposity and risk of disease, to test for interactions between BMI and favorable adiposity genetics, and to test effects separately in men and women. In the UK Biobank, the 50% of individuals carrying the most favorable adiposity alleles had higher BMIs (0.120 kg/m(2) [95% CI 0.066, 0.174]; P = 1E-5) and higher body fat percentage (0.301% [0.230, 0.372]; P = 1E-16) compared with the 50% of individuals carrying the fewest alleles. For a given BMI, the 50% of individuals carrying the most favorable adiposity alleles were at lower risk of type 2 diabetes (odds ratio [OR] 0.837 [0.784, 0.894]; P = 1E-7), hypertension (OR 0.935 [0.911, 0.958]; P = 1E-7), and heart disease (OR 0.921 [0.872, 0.973]; P = 0.003) and had lower blood pressure (systolic -0.859 mmHg [-1.099, -0.618]; P = 3E-12 and diastolic -0.394 mmHg [-0.534, -0.254]; P = 4E-8). In women, these associations could be explained by the observation that the alleles associated with higher BMI but lower risk of disease were also associated with a favorable body fat distribution, with a lower waist-to-hip ratio (-0.004 cm [95% CI -0.005, -0.003] 50% vs. 50%; P = 3E-14), but in men, the favorable adiposity alleles were associated with higher waist circumference (0.454 cm [0.267, 0.641] 50% vs. 50%; P = 2E-6) and higher waist-to-hip ratio (0.0013 [0.0003, 0.0024] 50% vs. 50%; P = 0.01). Results were strengthened when a meta-analysis with five additional studies was conducted. There was no evidence of interaction between a genetic score consisting of known BMI variants and the favorable adiposity genetic score. In conclusion, different molecular mechanisms that lead to higher body fat percentage (with greater subcutaneous storage capacity) can have different impacts on cardiometabolic disease risk. Although higher BMI is associated with higher risk of diseases, better fat storage capacity could reduce the risk., (© 2016 by the American Diabetes Association. Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered.)
- Published
- 2016
- Full Text
- View/download PDF
27. Variants in the FTO and CDKAL1 loci have recessive effects on risk of obesity and type 2 diabetes, respectively.
- Author
-
Wood AR, Tyrrell J, Beaumont R, Jones SE, Tuke MA, Ruth KS, Yaghootkar H, Freathy RM, Murray A, Frayling TM, and Weedon MN
- Subjects
- Alleles, Body Mass Index, Genetic Predisposition to Disease genetics, Genome-Wide Association Study, Genotype, Humans, Models, Statistical, Obesity genetics, Polymorphism, Single Nucleotide genetics, Principal Component Analysis, Alpha-Ketoglutarate-Dependent Dioxygenase FTO genetics, Diabetes Mellitus, Type 2 genetics, tRNA Methyltransferases genetics
- Abstract
Aims/hypothesis: Genome-wide association (GWA) studies have identified hundreds of common genetic variants associated with obesity and type 2 diabetes. These studies have usually focused on additive association tests. Identifying deviations from additivity may provide new biological insights and explain some of the missing heritability for these diseases., Methods: We performed a GWA study using a dominance deviation model for BMI, obesity (29,925 cases) and type 2 diabetes (4,040 cases) in 120,286 individuals of British ancestry from the UK Biobank study. We also investigated whether single nucleotide polymorphisms previously shown to be associated with these traits showed any enrichment for departures from additivity., Results: Known obesity-associated variants in FTO showed strong evidence of deviation from additivity (p DOMDEV = 3 × 10(-5)) through a recessive effect of the allele associated with higher BMI. The average BMI of individuals carrying zero, one or two BMI-raising alleles was 27.27 (95% CI 27.22, 27.31) kg/m(2), 27.54 (95% CI 27.50, 27.58) kg/m(2) and 28.07 (95% CI 28.00, 28.14) kg/m(2), respectively. A similar effect was observed in 105,643 individuals from the GIANT Consortium (p DOMDEV = 0.003; meta-analysis p DOMDEV = 1 × 10(-7)). For type 2 diabetes, we detected a recessive effect (p DOMDEV = 5 × 10(-4)) at CDKAL1. Relative to homozygous non-risk allele carriers, homozygous risk allele carriers had an OR of 1.48 (95% CI 1.32, 1.65), while the heterozygous group had an OR of 1.06 (95% CI 0.99, 1.14), a result consistent with that of a previous study. We did not identify any novel associations at genome-wide significance., Conclusions/interpretation: Although we found no evidence of widespread non-additive genetic effects contributing to obesity and type 2 diabetes risk, we did find robust examples of recessive effects at the FTO and CDKAL1 loci., Access to Research Materials: Summary statistics are available at www.t2diabetesgenes.org and by request (a.r.wood@exeter.ac.uk). All underlying data are available on application from the UK Biobank.
- Published
- 2016
- Full Text
- View/download PDF
28. Human longevity is influenced by many genetic variants: evidence from 75,000 UK Biobank participants.
- Author
-
Pilling LC, Atkins JL, Bowman K, Jones SE, Tyrrell J, Beaumont RN, Ruth KS, Tuke MA, Yaghootkar H, Wood AR, Freathy RM, Murray A, Weedon MN, Xue L, Lunetta K, Murabito JM, Harries LW, Robine JM, Brayne C, Kuchel GA, Ferrucci L, Frayling TM, and Melzer D
- Subjects
- Aged, Aged, 80 and over, Databases, Genetic, Female, Genome-Wide Association Study, Humans, Male, Middle Aged, Polymorphism, Genetic, Smoking genetics, United Kingdom, Longevity genetics
- Abstract
Variation in human lifespan is 20 to 30% heritable in twins but few genetic variants have been identified. We undertook a Genome Wide Association Study (GWAS) using age at death of parents of middle-aged UK Biobank participants of European decent (n=75,244 with father's and/or mother's data, excluding early deaths). Genetic risk scores for 19 phenotypes (n=777 proven variants) were also tested. In GWAS, a nicotine receptor locus(CHRNA3, previously associated with increased smoking and lung cancer) was associated with fathers' survival. Less common variants requiring further confirmation were also identified. Offspring of longer lived parents had more protective alleles for coronary artery disease, systolic blood pressure, body mass index, cholesterol and triglyceride levels, type-1 diabetes, inflammatory bowel disease and Alzheimer's disease. In candidate analyses, variants in the TOMM40/APOE locus were associated with longevity, but FOXO variants were not. Associations between extreme longevity (mother >=98 years, fathers >=95 years, n=1,339) and disease alleles were similar, with an additional association with HDL cholesterol (p=5.7x10-3). These results support a multiple protective factors model influencing lifespan and longevity (top 1% survival) in humans, with prominent roles for cardiovascular-related pathways. Several of these genetically influenced risks, including blood pressure and tobacco exposure, are potentially modifiable.
- Published
- 2016
- Full Text
- View/download PDF
29. Genetic evidence that lower circulating FSH levels lengthen menstrual cycle, increase age at menopause and impact female reproductive health.
- Author
-
Ruth KS, Beaumont RN, Tyrrell J, Jones SE, Tuke MA, Yaghootkar H, Wood AR, Freathy RM, Weedon MN, Frayling TM, and Murray A
- Subjects
- Adult, Aged, Endometriosis genetics, Female, Follicle Stimulating Hormone genetics, Genetic Association Studies, Genetic Markers, Humans, Infertility, Female genetics, Linear Models, Male, Middle Aged, Odds Ratio, Promoter Regions, Genetic, Reproductive Health, Follicle Stimulating Hormone blood, Follicle Stimulating Hormone, beta Subunit genetics, Menopause genetics, Menstrual Cycle genetics, Polymorphism, Single Nucleotide
- Abstract
Study Question: How does a genetic variant in the FSHB promoter, known to alter FSH levels, impact female reproductive health?, Summary Answer: The T allele of the FSHB promoter polymorphism (rs10835638; c.-211G>T) results in longer menstrual cycles and later menopause and, while having detrimental effects on fertility, is protective against endometriosis., What Is Known Already: The FSHB promoter polymorphism (rs10835638; c.-211G>T) affects levels of FSHB transcription and, as a result, circulating levels of FSH. FSH is required for normal fertility and genetic variants at the FSHB locus are associated with age at menopause and polycystic ovary syndrome (PCOS)., Study Design, Size, Duration: We used cross-sectional data from the UK Biobank to look at associations between the FSHB promoter polymorphism and reproductive traits, and performed a genome-wide association study (GWAS) for length of menstrual cycle., Participants/materials, Setting, Methods: We included white British individuals aged 40-69 years in 2006-2010, in the May 2015 release of genetic data from UK Biobank. We tested the FSH-lowering T allele of the FSHB promoter polymorphism (rs10835638; c.-211G>T) for associations with 29, mainly female, reproductive phenotypes in up to 63 350 women and 56 608 men. We conducted a GWAS in 9534 individuals to identify genetic variants associated with length of menstrual cycle., Main Results and the Role of Chance: The FSH-lowering T allele of the FSHB promoter polymorphism (rs10835638; MAF 0.16) was associated with longer menstrual cycles [0.16 SD (c. 1 day) per minor allele; 95% confidence interval (CI) 0.12-0.20; P = 6 × 10(-16)], later age at menopause (0.13 years per minor allele; 95% CI 0.04-0.22; P = 5.7 × 10(-3)), greater female nulliparity [odds ratio (OR) = 1.06; 95% CI 1.02-1.11; P = 4.8 × 10(-3)] and lower risk of endometriosis (OR = 0.79; 95% CI 0.69-0.90; P = 4.1 × 10(-4)). The FSH-lowering T allele was not associated with other female reproductive illnesses or conditions in our study and we did not replicate associations with male infertility or PCOS. In the GWAS for menstrual cycle length, only variants near the FSHB gene reached genome-wide significance (P < 5 × 10(-9))., Limitations, Reasons for Caution: The data included might be affected by recall bias. Cycle length was not available for 25% of women still cycling (1% did not answer, 6% did not know and for 18% cycle length was recorded as 'irregular'). Women with a cycle length recorded were aged over 40 and were approaching menopause; however, we did not find evidence that this affected the results. Many of the groups with illnesses had relatively small sample sizes and so the study may have been under-powered to detect an effect., Wider Implications of the Findings: We found a strong novel association between a genetic variant that lowers FSH levels and longer menstrual cycles, at a locus previously robustly associated with age at menopause. The variant was also associated with nulliparity and endometriosis risk. These findings should now be verified in a second independent group of patients. We conclude that lifetime differences in circulating levels of FSH between individuals can influence menstrual cycle length and a range of reproductive outcomes, including menopause timing, infertility, endometriosis and PCOS., Study Funding/competing Interests: None., Trial Registration Number: Not applicable., (© The Author 2016. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology.)
- Published
- 2016
- Full Text
- View/download PDF
30. Structural forms of the human amylase locus and their relationships to SNPs, haplotypes and obesity.
- Author
-
Usher CL, Handsaker RE, Esko T, Tuke MA, Weedon MN, Hastie AR, Cao H, Moon JE, Kashin S, Fuchsberger C, Metspalu A, Pato CN, Pato MT, McCarthy MI, Boehnke M, Altshuler DM, Frayling TM, Hirschhorn JN, and McCarroll SA
- Subjects
- Adolescent, Adult, Body Mass Index, Cohort Studies, Female, Gene Dosage, Gene Frequency, Genome-Wide Association Study methods, Genotype, Humans, Male, Middle Aged, Principal Component Analysis, Young Adult, Amylases genetics, Genetic Predisposition to Disease genetics, Haplotypes, Obesity genetics, Polymorphism, Single Nucleotide
- Abstract
Hundreds of genes reside in structurally complex, poorly understood regions of the human genome. One such region contains the three amylase genes (AMY2B, AMY2A and AMY1) responsible for digesting starch into sugar. Copy number of AMY1 is reported to be the largest genomic influence on obesity, although genome-wide association studies for obesity have found this locus unremarkable. Using whole-genome sequence analysis, droplet digital PCR and genome mapping, we identified eight common structural haplotypes of the amylase locus that suggest its mutational history. We found that the AMY1 copy number in an individual's genome is generally even (rather than odd) and partially correlates with nearby SNPs, which do not associate with body mass index (BMI). We measured amylase gene copy number in 1,000 obese or lean Estonians and in 2 other cohorts totaling ∼3,500 individuals. We had 99% power to detect the lower bound of the reported effects on BMI, yet found no association.
- Published
- 2015
- Full Text
- View/download PDF
31. Whole-genome sequencing to understand the genetic architecture of common gene expression and biomarker phenotypes.
- Author
-
Wood AR, Tuke MA, Nalls M, Hernandez D, Gibbs JR, Lin H, Xu CS, Li Q, Shen J, Jun G, Almeida M, Tanaka T, Perry JR, Gaulton K, Rivas M, Pearson R, Curran JE, Johnson MP, Göring HH, Duggirala R, Blangero J, Mccarthy MI, Bandinelli S, Murray A, Weedon MN, Singleton A, Melzer D, Ferrucci L, and Frayling TM
- Subjects
- Adult, Aged, Aged, 80 and over, Female, Gene Frequency, Genetic Variation, Genome, Human, Genotyping Techniques, High-Throughput Nucleotide Sequencing, Humans, Male, Middle Aged, Polymorphism, Single Nucleotide, Quantitative Trait Loci, Young Adult, Genetic Association Studies methods, Genetic Markers, Phenotype
- Abstract
Initial results from sequencing studies suggest that there are relatively few low-frequency (<5%) variants associated with large effects on common phenotypes. We performed low-pass whole-genome sequencing in 680 individuals from the InCHIANTI study to test two primary hypotheses: (i) that sequencing would detect single low-frequency-large effect variants that explained similar amounts of phenotypic variance as single common variants, and (ii) that some common variant associations could be explained by low-frequency variants. We tested two sets of disease-related common phenotypes for which we had statistical power to detect large numbers of common variant-common phenotype associations-11 132 cis-gene expression traits in 450 individuals and 93 circulating biomarkers in all 680 individuals. From a total of 11 657 229 high-quality variants of which 6 129 221 and 5 528 008 were common and low frequency (<5%), respectively, low frequency-large effect associations comprised 7% of detectable cis-gene expression traits [89 of 1314 cis-eQTLs at P < 1 × 10(-06) (false discovery rate ∼5%)] and one of eight biomarker associations at P < 8 × 10(-10). Very few (30 of 1232; 2%) common variant associations were fully explained by low-frequency variants. Our data show that whole-genome sequencing can identify low-frequency variants undetected by genotyping based approaches when sample sizes are sufficiently large to detect substantial numbers of common variant associations, and that common variant associations are rarely explained by single low-frequency variants of large effect., (© The Author 2014. Published by Oxford University Press.)
- Published
- 2015
- Full Text
- View/download PDF
32. Another explanation for apparent epistasis.
- Author
-
Wood AR, Tuke MA, Nalls MA, Hernandez DG, Bandinelli S, Singleton AB, Melzer D, Ferrucci L, Frayling TM, and Weedon MN
- Subjects
- Female, Humans, Male, Epistasis, Genetic genetics, Gene Expression Regulation genetics, Transcription, Genetic genetics
- Published
- 2014
- Full Text
- View/download PDF
33. Wear in alumina-on-alumina ceramic total hip replacements: a retrieval analysis of edge loading.
- Author
-
Esposito CI, Walter WL, Roques A, Tuke MA, Zicat BA, Walsh WR, and Walter WK
- Subjects
- Adult, Aged, Aged, 80 and over, Aluminum Oxide, Arthroplasty, Replacement, Hip methods, Ceramics, Equipment Failure Analysis methods, Female, Humans, Male, Middle Aged, Prosthesis Design, Prosthesis Failure, Reoperation, Weight-Bearing, Arthroplasty, Replacement, Hip instrumentation, Hip Prosthesis
- Abstract
We analysed 54 alumina ceramic-on-ceramic bearings from total hip replacements retrieved at one centre after a mean duration of 3.5 years (0.2 to 10.6) in situ. These implants were obtained from 54 patients (16 men and 38 women) with a mean age of 67 years (33 to 88) who underwent revision for a variety of reasons. Posterior edge loading was found in the majority of these retrievals (32 out of 54). Anterosuperior edge loading occurred less often but produced a higher rate of wear. Stripe wear on the femoral heads had a median volumetric wear rate of 0.2 mm(3)/year (0 to 7.2). The wear volume on the femoral heads corresponded to the width of edge wear on the matching liner. Anteversion of the acetabular component was found to be a more important determinant than inclination for wear in ceramic bearings. Posterior edge loading may be considered to be a normal occurrence in ceramic-on-ceramic bearings, with minimal clinical consequences. Edge loading should be defined as either anterosuperior or posterior, as each edge loading mechanism may result in different clinical implications.
- Published
- 2012
- Full Text
- View/download PDF
34. The tribological behaviour of different clearance MOM hip joints with lubricants of physiological viscosities.
- Author
-
Hu XQ, Wood RJ, Taylor A, and Tuke MA
- Subjects
- Animals, Cattle, Culture Media metabolism, Friction, Gait, Hip Prosthesis, Humans, Lubricants chemistry, Materials Testing, Metals chemistry, Synovial Fluid metabolism, Torque, Viscosity, Walking, Arthroplasty, Replacement, Hip methods, Hip Joint physiopathology
- Abstract
Clearance is one of the most influential parameters on the tribological performance of metal-on-metal (MOM) hip joints and its selection is a subject of considerable debate. The objective of this paper is to study the lubrication behaviour of different clearances for MOM hip joints within the range of human physiological and pathological fluid viscosities. The frictional torques developed by MOM hip joints with a 50 mm diameter were measured for both virgin surfaces and during a wear simulator test. Joints were manufactured with three different diametral clearances: 20, 100, and 200 microm. The fluid used for the friction measurements which contained different ratios of 25 percent newborn calf serum and carboxymethyl cellulose (CMC) with the obtained viscosities values ranging from 0.001 to 0.71 Pa s. The obtained results indicate that the frictional torque for the 20 microm clearance joint remains high over the whole range of the viscosity values. The frictional torque of the 100 microm clearance joint was low for the very low viscosity (0.001 Pa s) lubricant, but increased with increasing viscosity value. The frictional torque of the 200 microm clearance joint was high at very low viscosity levels, however, it reduced with increasing viscosity. It is concluded that a smaller clearance level can enhance the formation of an elastohydrodynamic lubrication (EHL) film, but this is at the cost of preventing fluid recovery between the bearing surfaces during the unloaded phase of walking. Larger clearance bearings allow a better recovery of lubricant during the unloaded phase, which is necessary for higher viscosity lubricants. The selection of the clearance value should therefore consider both the formation of the EHL film and the fluid recovery as a function of the physiological viscosity in order to get an optimal tribological performance for MOM hip joints. The application of either 25 per cent bovine serum or water in existing in vitro tribological study should also be revised to consider the relevance of clinic synovial fluid viscosities and to avoid possible misleading results.
- Published
- 2011
- Full Text
- View/download PDF
35. The problem with large diameter metal-on-metal acetabular cup inclination.
- Author
-
Jeffers JR, Roques A, Taylor A, and Tuke MA
- Subjects
- Acetabulum diagnostic imaging, Arthroplasty, Replacement, Hip adverse effects, Hip Joint diagnostic imaging, Humans, Joint Diseases diagnostic imaging, Materials Testing, Prosthesis Design, Prosthesis Failure, Radiography, Risk Assessment, Acetabulum surgery, Arthroplasty, Replacement, Hip instrumentation, Hip Joint surgery, Hip Prosthesis, Joint Diseases surgery, Metals
- Abstract
Large diameter metal-on-metal hip bearings have proven to be clinically successful in active patients, but, in a small number, they are associated with elevated wear and high metal ion levels when cup inclination angles are too steep and the version is too extreme, or either alone. Based on the geometry of six different commercially available large diameter metal-on-metal acetabular components, this study demonstrated that the critical bearing surface operates at an angle up to 16 masculine greater than the cup face inclination. Due to geometry alone, measured cup inclination is not the angle that most surgeons perceive it to be. We strongly recommend when employing large diameter metal-on-metal bearings that lower inclination and version angles are targeted to prevent excessive wear.
- Published
- 2009
36. Squeaking hips.
- Author
-
Walter WL, Waters TS, Gillies M, Donohoo S, Kurtz SM, Ranawat AS, Hozack WJ, and Tuke MA
- Subjects
- Acoustics, Adult, Aged, Ceramics, Humans, Middle Aged, Models, Theoretical, Prosthesis Design, Prosthesis Failure, Titanium, Hip Prosthesis, Noise
- Published
- 2008
- Full Text
- View/download PDF
37. Design considerations and life prediction of metal-on-metal bearings: the effect of clearance.
- Author
-
Tuke MA, Scott G, Roques A, Hu XQ, and Taylor A
- Subjects
- Friction, Metals, Models, Structural, Models, Theoretical, Prosthesis Design, Prosthesis Failure, Reoperation, Hip Prosthesis
- Abstract
Background: Clinical observations suggest that metal-on-metal arthroplasties that have been implanted for more than twenty years do fail. It is proposed that there are not two, but three distinct phases of wear life for any metal-on-metal implant system: bedding-in, steady state, and end point. In this study, we asked two questions: can we explain late failure due to wear, and will there be a late failure mechanism due to a change in the frictional torque?, Methods: In order to characterize wear failure, an analysis was made of five retrieved metal-on-metal couples that were mapped with use of a roundness machine. A geometrical model was developed on the basis of these observations, and wear at the end point was calculated. The literature on first-generation metal-on-metal implants retrieved for aseptic loosening was reviewed to assess the agreement with the retrieval findings as well as the wear model., Results: A wear patch of an appreciable and constant size could be measured in all five retrieved couples. The end point of revision was observed to occur when the wear progression reached a contact area corresponding to approximately 75% of the projected diameter of the ball. The wear volume was calculated from the geometry. The available literature describing the wear characteristics of retrieved bearings after successful clinical use showed good agreement with the calculated wear model., Conclusions: During the implant life of long-term successful metal-on-metal devices, a wear patch develops, as evident from retrieved failed devices. Failure often occurs through loosening, and the observed wear patch is similar in size for devices measured by us and for those described in the literature. We hypothesized that failure by loosening occurs through the accumulation of wear, which eventually leads to high friction within the bearing and increased torsional forces across the joint and its fixation.
- Published
- 2008
- Full Text
- View/download PDF
38. Wear and acetabular component orientation in third generation alumina-on-alumina ceramic bearings: an analysis of 33 retrievals [corrected].
- Author
-
Lusty PJ, Watson A, Tuke MA, Walter WL, Walter WK, and Zicat B
- Subjects
- Acetabulum surgery, Ceramics, Equipment Failure Analysis methods, Humans, Orientation, Prosthesis Failure, Aluminum Oxide, Arthroplasty, Replacement, Hip instrumentation, Hip Prosthesis
- Abstract
We studied 33 third generation, alumina ceramic-on-ceramic bearings retrieved from cementless total hip replacements after more than six months in situ. Wear volume was measured with a Roundtest machine, and acetabular orientation from the anteroposterior pelvic radiograph. The overall median early wear rate was 0.1 mm(3)/yr for the femoral heads, and 0.04 mm(3)/yr for the acetabular liners. We then excluded hips where the components had migrated. In this stable subgroup of 22 bearings, those with an acetabular anteversion of < 15 degrees (seven femoral heads) had a median femoral head wear rate of 1.2 mm(3)/yr, compared with 0 mm(3)/yr for those with an anteversion of > or =15 degrees (15 femoral heads, p < 0.001). Even under edge loading, wear volumes with ceramic-on-ceramic bearings are small in comparison to other bearing materials. Low acetabular anteversion is associated with greater wear.
- Published
- 2007
- Full Text
- View/download PDF
39. Edge loading in third generation alumina ceramic-on-ceramic bearings: stripe wear.
- Author
-
Walter WL, Insley GM, Walter WK, and Tuke MA
- Subjects
- Adult, Aged, Arthroplasty, Replacement, Hip, Female, Humans, Male, Microscopy, Electron, Scanning, Middle Aged, Prosthesis Design, Prosthesis Failure, Aluminum Oxide, Equipment Failure Analysis, Hip Prosthesis
- Abstract
Alumina ceramic-on-ceramic bearings perform exceptionally well under standard hip simulator conditions, but in vivo some retrieved bearings have shown an unusual stripe pattern of wear. We studied 16 bearings retrieved from a series of 1,588 cementless hip arthroplasties with third generation alumina ceramic-on-ceramic bearings to characterize the mechanism of stripe wear formation. None of these bearings were retrieved for bearing failure. The average wear volume was 0.4 mm(3) per year in the heads and 0.3 mm(3) per year in the liners. Mapping of wear stripes on the heads and liners showed that the majority do not occur with normal walking; instead they probably occur with edge loading when the hip is flexed, such as with rising from a chair or with climbing a high step.
- Published
- 2004
- Full Text
- View/download PDF
40. In vivo biocompatibility and mechanical study of novel bone-bioactive materials for prosthetic implantation.
- Author
-
Zhang XS, Revell PA, Evans SL, Tuke MA, and Gregson PJ
- Subjects
- Algorithms, Alloys, Animals, Biomechanical Phenomena, Bone Development, Coated Materials, Biocompatible, Durapatite, Epoxy Compounds, Female, Fluorescent Dyes, Materials Testing, Microscopy, Electron, Scanning, Microscopy, Fluorescence, Polymethyl Methacrylate, Rabbits, Stress, Mechanical, Surface Properties, Titanium, Bone Substitutes, Implants, Experimental
- Abstract
Two epoxy materials with or without adhesively bonded hydroxyapatite (HA) coatings were studied for their biocompatibility and mechanical pushout strength using in vivo implantation in the rabbit lower femur for a duration of 10 days to 6 months. Both were two-part epoxies cured at room temperature for 24 h, with material 1 (Ampreg 26; SP Systems Limited, Cowes, UK) postcured at 110 degrees C (Tg approximately 80 degrees C) and Material 2 (CG5052; Ciba Geigy Limited, Cambridge, UK) at 125 degrees C (Tg approximately 120 degrees C). Implantation in dead rabbit bone was performed to provide mechanical baseline levels. Polymethylmethacrylate (PMMA) and conventionally HA-coated titanium alloy (Ti-6Al-4V) were used as control materials. In the biological study, different fluorescent dyes were used to label newly formed bone. After 6 weeks of implantation, results from mechanical pushout tests showed that the interfacial shear strength (ISS) values were significantly higher than for dead bones with each of the different implants (p < .01-.001). HA-coated material 2 showed a significantly higher ISS value than the uncoated material (p < .05) after 6 weeks' implantation. However, the ISS value for the uncoated material 2 was significantly higher than for PMMA controls (p < .05). No significant differences in the ISS values were shown between HA-coated materials 1 and 2 and Ti-6Al-4V on in vivo implantation for 6 weeks. Failure points of the pushout test from the three HA-coated materials were defined by scanning electron microscopy. Specimens implanted with both HA-coated epoxies were fractured within the HA-coatings or the bone, while with HA-coated Ti-6Al-4V cracked between the coating and metal implant. The percentage of bone in contact with the implant surface was obtained by image analysis which showed that there were no significant differences between different materials after short time implantation (up to 6 week). Long-term implantation of the HA-coated material 2 showed that the percentage of bone contact had increased from 52.8+/-1.1% (6 week) to 80.0+/-0.3% (3 months) (p < .01) and remained at 81.0+/-0.8% (6 months). Measurements of bone mineralization rate (BMR) showed that after 3 weeks of implantation, there were no significant differences between PMMA and uncoated materials 1 and 2. After 6 weeks, the BMRs in animals implanted with either HA-coated material 1 or 2 were significantly higher than with HA-coated Ti-6Al-4V (p < .05-.0001 in both cases), but with HA-coated material 2 was lower than with this material uncoated (p < .05-.001). No significant differences were found between the two HA-coated epoxy materials. In addition, there were always lower BMRs during the third week of implantation than other periods regardless of biomaterial implanted. The study indicated that the adhesively bonded HA-coated novel epoxy materials were superior to conventional plasma-sprayed Ti-6Al-4V implants with respect to both BMR and bone integration with the implant surfaces. Adhesively bonded HA-coated epoxy materials had similar ISS values to HA-coated Ti-6Al-4V, but the former failed within the bone and coating, while the latter showed splitting between coating and metal.
- Published
- 1999
- Full Text
- View/download PDF
41. Evaluation of wear in an all-polymer total knee replacement. Part 2: clinical evaluation of wear in a polyethylene on polyacetal total knee.
- Author
-
Bradley GW, Freeman MA, Tuke MA, and McKellop HA
- Subjects
- Chromium Alloys chemistry, Evaluation Studies as Topic, Female, Follow-Up Studies, Humans, Male, Materials Testing, Prosthesis Failure, Acetals chemistry, Knee Prosthesis, Polymers chemistry
- Abstract
In an effort to improve the long-term result of total joint replacement arthroplasty, we have investigated the use of a polymer-on-polymer articular replacement arthroplasty. Because of their known biocompatibility and previous use in orthopedic surgery, polyethylene and polyacetal (copolymer, Hoechst) were selected. Polyethylene served in its usual role as the concave member of the articulation; polyacetal formed the convex number. Formal wear testing using a multi-channel hip simulator demonstrated superior wear characteristics of the polymer-on-polymer configuration compared to a conventional chrome-cobalt versus polymer (polyethylene) configuration. A clinical series of relatively high-activity patients having a minimum five-year follow-up (N = 26) showed no specific unfavorable reaction to this material combination in a total knee replacement. Given certain potential advantages of polymeric materials, as well as some theoretical disadvantages of metallic materials, a polymer-on-polymer design for a large joint replacement may have some merit.
- Published
- 1993
- Full Text
- View/download PDF
42. Implant arthroplasty in the adult hindfoot.
- Author
-
Samuelson KM, Freeman MA, and Tuke MA
- Subjects
- Foot diagnostic imaging, Humans, Radiography, Talus surgery, Tarsal Bones diagnostic imaging, Arthroplasty methods, Foot Deformities, Acquired surgery, Prostheses and Implants, Tarsal Bones surgery
- Abstract
In patients with mild to moderate valgus deformity and localized pain due to lateral impingement, the subtalar implant has been effective in controlling position and relieving localized pain. When used in conjunction with a talonavicular resurfacing prosthesis in the absence of talonavicular subluxation, the implant has been effective in relieving pain and maintaining the foot in a normal or nearly normal position. In feet with valgus deformity and talonavicular subluxation, both the subtalar implant and the talonavicular prosthesis with a built-in stop must be used. Use of these implants requires that the foot be supple and correctable to at least neutral position at surgery. The valgus hindfoot with a subluxated but otherwise normal talonavicular joint presents a greater problem. In this condition correction can be maintained only if the subtalar implant is used in conjunction with the modified talonavicular joint with a built-in stop. External supports in the shoe have not been routinely used in all patients after operation for a variety of reasons (mostly nonmedical). It may be advisable in patients who have had correction of a deformity to continue to use some sort of support in the shoe for most ambulation. Arthroplasty early in the disease course, before severe deformities develop, may prevent progression of the disorder, but more experience is necessary to validate clinical impressions.
- Published
- 1983
43. Engineering considerations in the design of an ankle joint.
- Author
-
Kempson GE, Freeman MA, and Tuke MA
- Subjects
- Adult, Arthritis, Rheumatoid surgery, Biomedical Engineering, Bone Cements, Chromium Alloys, Female, Humans, Male, Methylmethacrylates, Middle Aged, Osteoarthritis surgery, Polyethylenes, Stainless Steel, Stress, Mechanical, Talus anatomy & histology, Talus physiology, Tibia physiology, Ankle Joint anatomy & histology, Ankle Joint physiology, Ankle Joint surgery, Joint Prosthesis standards, Prosthesis Design standards
- Abstract
A prothesis has been designed to replace the articulating surfaces of the human ankle joint. The prothesis is in two parts, each forming a segment of a right circular cylinder with a single axis of rotation. The concave tibial component is manufactured from ultra-high molecular weight polyethylene and the talar component is manufactured from medical grade stainless steel. It is likely, however, that the talar component will be commercially manufactured from cobalt chrome alloy (Vitallium or Vinertia). The two components are secured to the cancellous bone by polymethylmethacrylate bone cement and laboratory tests have indicated that the bond should be strong enough to withstand the loads encountered at the ankle joint in vivo. The tests have also shown that the stability and strength of the ankle are not seriously reduced by implantation of the prosthesis. Laboratory wear tests and clinical experience over the last two years encourage optimism over the long term performance of the prothesis.
- Published
- 1975
44. The effects of proteolytic enzymes on the mechanical properties of adult human articular cartilage.
- Author
-
Kempson GE, Tuke MA, Dingle JT, Barrett AJ, and Horsfield PH
- Subjects
- Adult, Aged, Cartilage, Articular drug effects, Elasticity, Female, Humans, Kinetics, Lysosomes enzymology, Male, Middle Aged, Cartilage, Articular physiology, Cathepsins pharmacology, Peptide Hydrolases pharmacology
- Abstract
The effects of the lysosomal proteinase cathepsin D on the mechanical properties of adult human articular cartilage were examined in detail in 7 joints within the age range 21 to 72 years. The results of a preliminary study on the effects of the lysosomal proteinase cathepsin B1 and clostridial collagenase on the mechanical properties of cartilage are also presented. Cartilage which had been incubated with either cathepsin D or cathepsin B1 showed increased deformation in uniaxial compression perpendicular to the articular surface. The enzyme-treated cartilage also showed decreased tensile stiffness at low values of stress. This effect was more pronounced in specimens from the deeper zone of cartilage than in specimens from the superficial zone. It was also more pronounced in specimens which were aligned perpendicular to the predominant alignment of the collagen fibres in the superficial zone than in specimens which were parallel to the collagen fibres. At higher stresses the tensile stiffness of the treated cartilage was not significantly different from that of the untreated tissue. The tensile fracture stress of the cartilage was also not significantly reduced by the action of cathepsin D. In contrast to the effects observed with the cathepsins, the preliminary results obtained by incubating cartilage for 24 h with clostridial collagenase showed that both the tensile stiffness and the fracture stress were considerably lower than the corresponding values for the untreated tissue. Biochemical analysis of the incubation media, and the specimens, revealed that a large proportion of the proteoglycans was released from the cartilage by each of the three enzymes. The proportion of the total collagen which was released from the cartilage was different for each enzyme: cathepsin D released between 0 and 1.5 per cent, cathepsin B1 released between 2.3 and 4.3 per cent and collagenase released between 5.3 and 27.8 per cent of the collagen after 24 h.
- Published
- 1976
- Full Text
- View/download PDF
45. Development and evolution of the ICLH ankle replacement.
- Author
-
Samuelson KM, Freeman MA, and Tuke MA
- Subjects
- Humans, Postoperative Complications, Prosthesis Design, Ankle Joint surgery, Joint Prosthesis instrumentation
- Abstract
In 1972 the original ICLH ankle was first used clinically, and since then the authors have implanted 75 ICLH ankles. The overall percentage of acceptable results in this series is about 70%. The most frequent complication seen was delayed wound healing. Talomalleolar contact with resultant pain was a significant problem early in the series. Partial collapse of the talus has occurred in five ankles. Our experience has shown that it is possible to replace the ankle and initially achieve a functioning, pain-free arthroplasty. There are many factors that may adversely influence the ultimate outcome; and thus, the procedure should be approached with caution.
- Published
- 1982
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.