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1. A multi-ethnic genome-wide association study implicates collagen matrix integrity and cell differentiation pathways in keratoconus

Author

Hardcastle, AJ, Liskova, P, Bykhovskaya, Y, McComish, BJ, Davidson, AE, Inglehearn, CF, Li, X, Choquet, H, Habeeb, M, Lucas, SEM, Sahebjada, S, Pontikos, N, Lopez, KER, Khawaja, AP, Ali, M, Dudakova, L, Skalicka, P, Van Dooren, BTH, Geerards, AJM, Haudum, CW, Lo Faro, V, Tenen, A, Simcoe, MJ, Patasova, K, Yarrand, D, Yin, J, Siddiqui, S, Rice, A, Farraj, LA, Chen, Y-DI, Rahi, JS, Krauss, RM, Theusch, E, Charlesworth, JC, Szczotka-Flynn, L, Toomes, C, Meester-Smoor, MA, Richardson, AJ, Mitchell, PA, Taylor, KD, Melles, RB, Aldave, AJ, Mills, RA, Cao, K, Chan, E, Daniell, MD, Wang, JJ, Rotter, JI, Hewitt, AW, MacGregor, S, Klaver, CCW, Ramdas, WD, Craig, JE, Iyengar, SK, O'Brart, D, Jorgenson, E, Baird, PN, Rabinowitz, YS, Burdon, KP, Hammond, CJ, Tuft, SJ, Hysi, PG, Hardcastle, AJ, Liskova, P, Bykhovskaya, Y, McComish, BJ, Davidson, AE, Inglehearn, CF, Li, X, Choquet, H, Habeeb, M, Lucas, SEM, Sahebjada, S, Pontikos, N, Lopez, KER, Khawaja, AP, Ali, M, Dudakova, L, Skalicka, P, Van Dooren, BTH, Geerards, AJM, Haudum, CW, Lo Faro, V, Tenen, A, Simcoe, MJ, Patasova, K, Yarrand, D, Yin, J, Siddiqui, S, Rice, A, Farraj, LA, Chen, Y-DI, Rahi, JS, Krauss, RM, Theusch, E, Charlesworth, JC, Szczotka-Flynn, L, Toomes, C, Meester-Smoor, MA, Richardson, AJ, Mitchell, PA, Taylor, KD, Melles, RB, Aldave, AJ, Mills, RA, Cao, K, Chan, E, Daniell, MD, Wang, JJ, Rotter, JI, Hewitt, AW, MacGregor, S, Klaver, CCW, Ramdas, WD, Craig, JE, Iyengar, SK, O'Brart, D, Jorgenson, E, Baird, PN, Rabinowitz, YS, Burdon, KP, Hammond, CJ, Tuft, SJ, and Hysi, PG

Abstract

Keratoconus is characterised by reduced rigidity of the cornea with distortion and focal thinning that causes blurred vision, however, the pathogenetic mechanisms are unknown. It can lead to severe visual morbidity in children and young adults and is a common indication for corneal transplantation worldwide. Here we report the first large scale genome-wide association study of keratoconus including 4,669 cases and 116,547 controls. We have identified significant association with 36 genomic loci that, for the first time, implicate both dysregulation of corneal collagen matrix integrity and cell differentiation pathways as primary disease-causing mechanisms. The results also suggest pleiotropy, with some disease mechanisms shared with other corneal diseases, such as Fuchs endothelial corneal dystrophy. The common variants associated with keratoconus explain 12.5% of the genetic variance, which shows potential for the future development of a diagnostic test to detect susceptibility to disease.

Published
2021

2. Phenotypic Consequences of the GJD2 Risk Genotype in Myopia Development.

Author

Haarman AEG, Enthoven CA, Tedja MS, Polling JR, Tideman JWL, Keunen JEE, Boon CJF, Felix JF, Raat H, Geerards AJM, Luyten GPM, van Rijn GA, Verhoeven VJM, and Klaver CCW

Subjects
Alleles, Anterior Chamber diagnostic imaging, Axial Length, Eye, Biometry, Case-Control Studies, Child, Connexins biosynthesis, Disease Progression, Female, Follow-Up Studies, Genotype, Humans, Male, Middle Aged, Myopia diagnosis, Myopia physiopathology, Prospective Studies, Gap Junction delta-2 Protein, Connexins genetics, Gene Expression Regulation, Myopia genetics, Population Surveillance, RNA genetics, Refraction, Ocular
Abstract

Purpose: To study the relatively high effect of the refractive error gene GJD2 in human myopia, and to assess its relationship with refractive error, ocular biometry and lifestyle in various age groups., Methods: The population-based Rotterdam Study (RS), high myopia case-control study MYopia STudy, and the birth-cohort study Generation R were included in this study. Spherical equivalent (SER), axial length (AL), axial length/corneal radius (AL/CR), vitreous depth (VD), and anterior chamber depth (ACD) were measured using standard ophthalmologic procedures. Biometric measurements were compared between GJD2 (rs524952) genotype groups; education and environmental risk score (ERS) were calculated to estimate gene-environment interaction effects, using the Synergy index (SI)., Results: RS adults carrying two risk alleles had a lower SER and longer AL, ACD and VD (AA versus TT, 0.23D vs. 0.70D; 23.79 mm vs. 23.52 mm; 2.72 mm vs. 2.65 mm; 16.12 mm vs. 15.87 mm; all P < 0.001). Children carrying two risk alleles had larger AL/CR at ages 6 and 9 years (2.88 vs. 2.87 and 3.00 vs. 2.96; all P < 0.001). Education and ERS both negatively influenced myopia and the biometric outcomes, but gene-environment interactions did not reach statistical significance (SI 1.25 [95% confidence interval {CI}, 0.85-1.85] and 1.17 [95% CI, 0.55-2.50] in adults and children)., Conclusions: The elongation of the eye caused by the GJD2 risk genotype follows a dose-response pattern already visible at the age of 6 years. These early effects are an example of how a common myopia gene may drive myopia.

Published
2021
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3. A multi-ethnic genome-wide association study implicates collagen matrix integrity and cell differentiation pathways in keratoconus.

Author

Hardcastle AJ, Liskova P, Bykhovskaya Y, McComish BJ, Davidson AE, Inglehearn CF, Li X, Choquet H, Habeeb M, Lucas SEM, Sahebjada S, Pontikos N, Lopez KER, Khawaja AP, Ali M, Dudakova L, Skalicka P, Van Dooren BTH, Geerards AJM, Haudum CW, Faro VL, Tenen A, Simcoe MJ, Patasova K, Yarrand D, Yin J, Siddiqui S, Rice A, Farraj LA, Chen YI, Rahi JS, Krauss RM, Theusch E, Charlesworth JC, Szczotka-Flynn L, Toomes C, Meester-Smoor MA, Richardson AJ, Mitchell PA, Taylor KD, Melles RB, Aldave AJ, Mills RA, Cao K, Chan E, Daniell MD, Wang JJ, Rotter JI, Hewitt AW, MacGregor S, Klaver CCW, Ramdas WD, Craig JE, Iyengar SK, O'Brart D, Jorgenson E, Baird PN, Rabinowitz YS, Burdon KP, Hammond CJ, Tuft SJ, and Hysi PG

Subjects
Humans, Australia epidemiology, Case-Control Studies, Europe epidemiology, Genetic Predisposition to Disease, Genome-Wide Association Study, Phenotype, Risk Assessment, Risk Factors, Cell Differentiation genetics, Collagen metabolism, Extracellular Matrix metabolism, Extracellular Matrix pathology, Genetic Loci, Keratoconus diagnosis, Keratoconus ethnology, Keratoconus genetics, Keratoconus metabolism, Polymorphism, Single Nucleotide
Abstract

Keratoconus is characterised by reduced rigidity of the cornea with distortion and focal thinning that causes blurred vision, however, the pathogenetic mechanisms are unknown. It can lead to severe visual morbidity in children and young adults and is a common indication for corneal transplantation worldwide. Here we report the first large scale genome-wide association study of keratoconus including 4,669 cases and 116,547 controls. We have identified significant association with 36 genomic loci that, for the first time, implicate both dysregulation of corneal collagen matrix integrity and cell differentiation pathways as primary disease-causing mechanisms. The results also suggest pleiotropy, with some disease mechanisms shared with other corneal diseases, such as Fuchs endothelial corneal dystrophy. The common variants associated with keratoconus explain 12.5% of the genetic variance, which shows potential for the future development of a diagnostic test to detect susceptibility to disease.

Published
2021
Full Text
View/download PDF

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