7 results on '"Oumoussa, Badreddine Mohand"'
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2. SHH medulloblastoma in a young adult with a TCF4 germline pathogenic variation
- Author
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Blanluet, Maud, Masliah-Planchon, Julien, Giurgea, Irina, Bielle, Franck, Girard, Elodie, Andrianteranagna, Mamy, Clemenceau, Stéphane, Bourneix, Christine, Burglen, Lydie, Doummar, Diane, Rapinat, Audrey, Oumoussa, Badreddine Mohand, Ayrault, Olivier, Pouponnot, Celio, Gentien, David, Pierron, Gaëlle, Delattre, Olivier, Doz, François, and Bourdeaut, Franck
- Published
- 2019
- Full Text
- View/download PDF
3. SLITRK2, an X-linked modifier of the age at onset in C9orf72 frontotemporal lobar degeneration
- Author
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Barbier, Mathieu, Camuzat, Agnès, Hachimi, Khalid El, Guegan, Justine, Rinaldi, Daisy, Lattante, Serena, Houot, Marion, Sánchez-Valle, Raquel, Sabatelli, Mario, Antonell, Anna, Molina-Porcel, Laura, Clot, Fabienne, Couratier, Philippe, van der Ende, Emma, van der Zee, Julie, Manzoni, Claudia, Camu, William, Cazeneuve, Cécile, Sellal, François, Didic, Mira, Golfier, Véronique, Pasquier, Florence, Duyckaerts, Charles, Rossi, Giacomina, Bruni, Amalia C, Alvarez, Victoria, Gómez-Tortosa, Estrella, de Mendonça, Alexandre, Graff, Caroline, Masellis, Mario, Nacmias, Benedetta, Oumoussa, Badreddine Mohand, Jornea, Ludmila, Forlani, Sylvie, Van Deerlin, Viviana, Rohrer, Jonathan D, Gelpi, Ellen, Rademakers, Rosa, Van Swieten, John, Le Guern, Eric, Van Broeckhoven, Christine, Ferrari, Raffaele, Génin, Emmanuelle, Brice, Alexis, Ber, Le, Isabelle Alexis Brice, Sophie, Auriacombe, Serge, Belliard, Anne, Bertrand, Anne, Bissery, Fre ́ de, ́ ric Blanc, Marie-Paule, Boncoeur, Ste, ́ phanie Bombois, Claire Boutoleau-Bretonnie` re, Agne`, s Camuzat, Mathieu, Ceccaldi, Marie, Chupin, Philippe, Couratier, Olivier, Colliot, Vincent, Deramecourt, Mira, Didic, Bruno, Dubois, Charles, Duyckaerts, Fre ́ de, ́ rique Etcharry-Bouyx, Aure, ́ lie Guignebert-Funkiewiez, Maı ̈te, ́ Formaglio, ́ ronique Golfier, Ve, Marie-Odile, Habert, Didier, Hannequin, Lucette, Lacomblez, Julien, Lagarde, ́ raldine Lautrette, Ge, Isabelle Le Ber, Benjamin Le Toullec, Richard, Levy, Marie-Anne, Mackowiak, Bernard-Franc ̧ois Michel, Florence, Pasquier, Thibaud, Lebouvier, Carole Roue, ́ -Jagot, Christel Thauvin- Robinet, Catherine, Thomas-Anterion, Je ́ re, ́ mie Pariente, Franc ̧ois Salachas, Sabrina, Sayah, Franc ̧ois Sellal, Assi-Herve, ́ Oya, Daisy, Rinaldi, Adeline, Rollin-Sillaire, Martine, Vercelletto, David, Wallon, Armelle, Rametti-Lacroux, Raffaele, Ferrari, Hernandez, Dena G., Nalls, Michael A., Rohrer, Jonathan D., Adaikalavan, Ramasamy, Kwok, John B. J., Carol Dobson- Stone, Brooks, William S., Schofield, Peter R., Halliday, Glenda M., Hodges, John R., Olivier, Piguet, Lauren, Bartley, Elizabeth, Thompson, Isabel Herna, ́ ndez, Agustı ́n Ruiz, Merce`, Boada, Barbara, Borroni, Alessandro, Padovani, Carlos, Cruchaga, Cairns, Nigel J., Luisa, Benussi, Giuliano, Binetti, Roberta, Ghidoni, Gianluigi, Forloni, Diego, Albani, Daniela, Galimberti, Chiara, Fenoglio, Maria, Serpente, Elio, Scarpini, ́ n, Jordi Clarimo, Alberto Lleo, ́, Rafael, Blesa, Maria Landqvist Waldo, ̈, Karin, Nilsson, Christer, Nilsson, Mackenzie, Ian R. A., Hsiung, Ging-Yuek R., Mann, David M. A., Jordan, Grafman, Morris, Christopher M., Johannes, Attems, Griffiths, Timothy D., Mckeith, Ian G., Thomas, Alan J., Pietro, Pietrini, Edward, Uey, Wassermann, Eric M., Atik, Baborie, Evelyn, Jaros, Tierney, Michael C., Pau, Pastor, Cristina, Razquin, Sara, Ortega-Cubero, Elena, Alonso, Robert, Perneczky, Janine, Diehl-Schmid, Panagiotis, Alexopoulos, Alexander, Kurz, Rainero, Innocenzo, Rubino, Elisa, Pinessi, Lorenzo, Ekaterina, Rogaeva, Peter St George-Hyslop, Giacomina, Rossi, Fabrizio, Tagliavini, Giorgio, Giaccone, Rowe, James B., Schlachetzki, Johannes C. M., James, Uphill, John, Collinge, Simon, Mead, Adrian, Danek, Van Deerlin, Vivianna M., Murray, Grossman, Trojanowski, John Q., Julie van der Zee, Christine Van Broeckhoven, Cappa, Stefano F., Isabelle, Leber, Alexis, Brice, Benedetta, Nacmias, Sandro, Sorbi, Silvia, Bagnoli, Irene, Piaceri, Nielsen, Jørgen E., Hjermind, Lena E., Matthias, Riemenschneider, Manuel, Mayhaus, Bernd, Ibach, Gilles, Gasparoni, Sabrina, Pichler, Wei, Gu, Rossor, Martin N., Fox, Nick C., Warren, Jason D., Maria Grazia Spillantini, Morris, Huw R., Patrizia, Rizzu, Peter, Heutink, Snowden, Julie S., Sara, Rollinson, Anna, Richardson, Alexander, Gerhard, Bruni, Amalia C., Raffaele, Maletta, Francesca, Frangipane, Chiara, Cupidi, Livia, Bernardi, Maria, Anfossi, Maura, Gallo, Maria Elena Conidi, Nicoletta, Smirne, Rosa, Rademakers, Matt, Baker, Dickson, Dennis W., Graff-Radford, Neill R., Petersen, Ronald C., David, Knopman, Josephs, Keith A., Boeve, Bradley F., Parisi, Joseph E., Seeley, William W., Miller, Bruce L., Karydas, Anna M., Howard, Rosen, van Swieten, John C., Dopper, Elise G. P., Harro, Seelaar, Pijnenburg, Yolande A. L., Philip, Scheltens, Giancarlo, Logroscino, Rosa, Capozzo, Valeria, Novelli, Puca, Annibale A., Massimo, Franceschi, Alfredo, Postiglione, Graziella, Milan, Paolo, Sorrentino, Mark, Kristiansen, Huei-Hsin, Chiang, Caroline, Graff, Adeline, Rollin, Dimitrios, Kapogiannis, Luigi, Ferrucci, Stuart, Pickering-Brown, Singleton, Andrew B., John, Hardy, Parastoo, Momeni., Neurology, Amsterdam Neuroscience - Neurodegeneration, Institut du Cerveau = Paris Brain Institute (ICM), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Sorbonne Université (SU)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Università cattolica del Sacro Cuore = Catholic University of the Sacred Heart [Roma] (Unicatt), Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Universitat de Barcelona (UB), Centre d'investigation clinique Paris Est [CHU Pitié Salpêtrière] (CIC Paris-Est), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Sorbonne Université (SU), Hôpital Dupuytren [CHU Limoges], Erasmus University Medical Center [Rotterdam] (Erasmus MC), Center for Molecular Neurology (VIB-UAntwerp), University of Antwerp (UA), University College of London [London] (UCL), Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Service de Neurologie [Hôpitaux Civils de Colmar], Hôpitaux Civils Colmar, Mécanismes Centraux et Périphériques de la Neurodégénérescence, Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM), Neurologie, maladies neuro-musculaires [Hôpital de la Timone - APHM], Aix Marseille Université (AMU)-Assistance Publique - Hôpitaux de Marseille (APHM)- Hôpital de la Timone [CHU - APHM] (TIMONE), Institut de Neurosciences des Systèmes (INS), Aix Marseille Université (AMU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre Hospitalier Yves le Foll, Lille Neurosciences & Cognition - U 1172 (LilNCog), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), Fondazione IRCCS Istituto Neurologico 'Carlo Besta', Regional Neurogenetic Centre [Lamezia Terme, Italy] (CRN - ASP Catanzaro), Hospital Central de Asturias, Institute of Health Research of Principado de Asturias (ISPA), Fundación Jiménez Díaz, Fundacion Jimenez Diaz [Madrid] (FJD), Faculdade de Medicina [Lisboa], Universidade de Lisboa = University of Lisbon (ULISBOA), Karolinska University Hospital [Stockholm], Sunnybrook Research Institute [Toronto] (SRI), Sunnybrook Health Sciences Centre, Università degli Studi di Firenze = University of Florence (UniFI), Fondazione Don Carlo Gnocchi, Plateforme Post-génomique de la Pitié-Salpêtrière (PASS-P3S), Unité Mixte de Service Production et Analyse de données en Sciences de la vie et en Santé (PASS), Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU), Hospital of the University of Pennsylvania (HUP), Perelman School of Medicine, University of Pennsylvania-University of Pennsylvania, Neurodegenerative Brain Diseases group, Department of Molecular Genetics, VIB, Antwerpen, Belgium, Génétique, génomique fonctionnelle et biotechnologies (UMR 1078) (GGB), EFS-Université de Brest (UBO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut Brestois Santé Agro Matière (IBSAM), Université de Brest (UBO), The French clinical and genetic Research network on FTLD/FTLD-ALS and PREVDEMALS, The International Frontotemporal Dementia Genomics Consortium, The European Early Onset Dementia (EU -EOD) Consortium, Brainbank Neuro-CEB Neuropathology Network, and Neurological Tissue Bank of the Biobank Hospital Clinic-IDIBAPS
- Subjects
Adult ,Male ,TDP-43 ,C9orf72 ,SLITRK2 ,amyotrophic lateral sclerosis ,frontotemporal dementia ,Nerve Tissue Proteins ,Settore MED/03 - GENETICA MEDICA ,Polymorphism, Single Nucleotide ,Cohort Studies ,Genes, X-Linked ,80 and over ,Medicine ,Dementia ,Humans ,Allele ,Age of Onset ,Polymorphism ,Aged ,Aged, 80 and over ,biology ,C9orf72 Protein ,business.industry ,Membrane Proteins ,MESH: Frontotemporal Lobar Degeneration / epidemiology ,Frontotemporal Lobar ,Degeneration / genetics ,Genes, X-Linked / genetics ,Genome-Wide Association Study / methods ,Frontotemporal lobar degeneration ,Single Nucleotide ,Middle Aged ,X-Linked ,medicine.disease ,Amyotrophic lateral sclerosis ,Minor allele frequency ,Genes ,Immunology ,Synaptophysin ,biology.protein ,Female ,MESH: Adult ,C9orf72 Protein / genetics ,Frontotemporal Lobar Degeneration / diagnosis ,[SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC] ,Human medicine ,Neurology (clinical) ,MESH: Humans ,Membrane Proteins / genetics ,Nerve Tissue Proteins / genetics ,Polymorphism, Single Nucleotide / genetics ,Age of onset ,Frontotemporal Lobar Degeneration ,business ,Frontotemporal dementia ,Genome-Wide Association Study - Abstract
The G4C2-repeat expansion in C9orf72 is the most common cause of frontotemporal dementia and of amyotrophic lateral sclerosis. The variability of age at onset and phenotypic presentations is a hallmark of C9orf72 disease. In this study, we aimed to identify modifying factors of disease onset in C9orf72 carriers using a family-based approach, in pairs of C9orf72 carrier relatives with concordant or discordant age at onset. Linkage and association analyses provided converging evidence for a locus on chromosome Xq27.3. The minor allele A of rs1009776 was associated with an earlier onset (P = 1 × 10−5). The association with onset of dementia was replicated in an independent cohort of unrelated C9orf72 patients (P = 0.009). The protective major allele delayed the onset of dementia from 5 to 13 years on average depending on the cohort considered. The same trend was observed in an independent cohort of C9orf72 patients with extreme deviation of the age at onset (P = 0.055). No association of rs1009776 was detected in GRN patients, suggesting that the effect of rs1009776 was restricted to the onset of dementia due to C9orf72. The minor allele A is associated with a higher SLITRK2 expression based on both expression quantitative trait loci (eQTL) databases and in-house expression studies performed on C9orf72 brain tissues. SLITRK2 encodes for a post-synaptic adhesion protein. We further show that synaptic vesicle glycoprotein 2 and synaptophysin, two synaptic vesicle proteins, were decreased in frontal cortex of C9orf72 patients carrying the minor allele. Upregulation of SLITRK2 might be associated with synaptic dysfunctions and drives adverse effects in C9orf72 patients that could be modulated in those carrying the protective allele. How the modulation of SLITRK2 expression affects synaptic functions and influences the disease onset of dementia in C9orf72 carriers will require further investigations. In summary, this study describes an original approach to detect modifier genes in rare diseases and reinforces rising links between C9orf72 and synaptic dysfunctions that might directly influence the occurrence of first symptoms.
- Published
- 2021
- Full Text
- View/download PDF
4. Clinicogenomic factors of biotherapy immunogenicity in autoimmune disease: A prospective multicohort study of the ABIRISK consortium
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Hassler, Signe, Bachelet, Delphine, Duhaze, Julianne, Szely, Natacha, Gleizes, Aude, Abina, Salima Hacein-Bey, Aktas, Orhan, Auer, Michael, Avouac, Jerome, Birchler, Mary, Bouhnik, Yoram, Brocq, Olivier, Buck-Martin, Dorothea, Cadiot, Guillaume, Carbonnel, Franck, Chowers, Yehuda, Comabella, Manuel, Derfuss, Tobias, De Vries, Niek, Donnellan, Naoimh, Doukani, Abiba, Guger, Michael, Hartung, Hans-Peter, Havrdova, Eva Kubala, Hemmer, Bernhard, Huizinga, Tom, Ingenhoven, Kathleen, Hyldgaard-Jensen, Poul Erik, Jury, Elizabeth C., Khalil, Michael, Kieseier, Bernd, Lauren, Anna, Lindberg, Raija, Loercher, Amy, Maggi, Enrico, Manson, Jessica, Mauri, Claudia, Oumoussa, Badreddine Mohand, Montalban, Xavier, Nachury, Maria, Nytrova, Petra, Richez, Christophe, Ryner, Malin, Sellebjerg, Finn, Sievers, Claudia, Sikkema, Dan, Soubrier, Martin, Tourdot, Sophie, Trang, Caroline, Vultaggio, Alessandra, Warnke, Clemens, Spindeldreher, Sebastian, Donnes, Pierre, Hickling, Timothy P., Mery, Agnes Hincelin, Allez, Matthieu, Deisenhammer, Florian, Fogdell-Hahn, Anna, Mariette, Xavier, Pallardy, Marc, Broet, Philippe, Hassler, Signe, Bachelet, Delphine, Duhaze, Julianne, Szely, Natacha, Gleizes, Aude, Abina, Salima Hacein-Bey, Aktas, Orhan, Auer, Michael, Avouac, Jerome, Birchler, Mary, Bouhnik, Yoram, Brocq, Olivier, Buck-Martin, Dorothea, Cadiot, Guillaume, Carbonnel, Franck, Chowers, Yehuda, Comabella, Manuel, Derfuss, Tobias, De Vries, Niek, Donnellan, Naoimh, Doukani, Abiba, Guger, Michael, Hartung, Hans-Peter, Havrdova, Eva Kubala, Hemmer, Bernhard, Huizinga, Tom, Ingenhoven, Kathleen, Hyldgaard-Jensen, Poul Erik, Jury, Elizabeth C., Khalil, Michael, Kieseier, Bernd, Lauren, Anna, Lindberg, Raija, Loercher, Amy, Maggi, Enrico, Manson, Jessica, Mauri, Claudia, Oumoussa, Badreddine Mohand, Montalban, Xavier, Nachury, Maria, Nytrova, Petra, Richez, Christophe, Ryner, Malin, Sellebjerg, Finn, Sievers, Claudia, Sikkema, Dan, Soubrier, Martin, Tourdot, Sophie, Trang, Caroline, Vultaggio, Alessandra, Warnke, Clemens, Spindeldreher, Sebastian, Donnes, Pierre, Hickling, Timothy P., Mery, Agnes Hincelin, Allez, Matthieu, Deisenhammer, Florian, Fogdell-Hahn, Anna, Mariette, Xavier, Pallardy, Marc, and Broet, Philippe
- Abstract
Background Biopharmaceutical products (BPs) are widely used to treat autoimmune diseases, but immunogenicity limits their efficacy for an important proportion of patients. Our knowledge of patient-related factors influencing the occurrence of antidrug antibodies (ADAs) is still limited. Methods and findings The European consortium ABIRISK (Anti-Biopharmaceutical Immunization: prediction and analysis of clinical relevance to minimize the RISK) conducted a clinical and genomic multicohort prospective study of 560 patients with multiple sclerosis (MS, n = 147), rheumatoid arthritis (RA, n = 229), Crohn's disease (n = 148), or ulcerative colitis (n = 36) treated with 8 different biopharmaceuticals (etanercept, n = 84; infliximab, n = 101; adalimumab, n = 153; interferon [IFN]-beta-1a intramuscularly [IM], n = 38; IFN-beta-1a subcutaneously [SC], n = 68; IFN-beta-1b SC, n = 41; rituximab, n = 31; tocilizumab, n = 44) and followed during the first 12 months of therapy for time to ADA development. From the bioclinical data collected, we explored the relationships between patient-related factors and the occurrence of ADAs. Both baseline and time-dependent factors such as concomitant medications were analyzed using Cox proportional hazard regression models. Mean age and disease duration were 35.1 and 0.85 years, respectively, for MS; 54.2 and 3.17 years for RA; and 36.9 and 3.69 years for inflammatory bowel diseases (IBDs). In a multivariate Cox regression model including each of the clinical and genetic factors mentioned hereafter, among the clinical factors, immunosuppressants (adjusted hazard ratio [aHR] = 0.408 [95% confidence interval (CI) 0.253-0.657], p < 0.001) and antibiotics (aHR = 0.121 [0.0437-0.333], p < 0.0001) were independently negatively associated with time to ADA development, whereas infections during the study (aHR = 2.757 [1.616-4.704], p < 0.001) and tobacco smoking (aHR = 2.150 [1.319-3.503], p < 0.01) were positively associated. 351,824 Single-Nucleot
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- 2020
5. Increased Fatty Acid Oxidation in Differentiated Proximal Tubular Cells Surviving a Reversible Episode of Acute Kidney Injury
- Author
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Bataille, Aurélien, primary, Galichon, Pierre, additional, Chelghoum, Nadjim, additional, Oumoussa, Badreddine Mohand, additional, Ziliotis, Marie-Julia, additional, Sadia, Iman, additional, Vandermeersch, Sophie, additional, Simon-Tillaux, Noémie, additional, Legouis, David, additional, Cohen, Raphaël, additional, Xu-Dubois, Yi-Chun, additional, Commereuc, Morgane, additional, Rondeau, Eric, additional, Le Crom, Stéphane, additional, and Hertig, Alexandre, additional
- Published
- 2018
- Full Text
- View/download PDF
6. Plasma levels of hsa-miR-152-3p are associated with diabetic nephropathy in patients with type 2 diabetes.
- Author
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Roux, Maguelonne, Perret, Claire, Feigerlova, Eva, Oumoussa, Badreddine Mohand, Saulnier, Pierre-Jean, Proust, Carole, Trégouët, David-Alexandre, and Hadjadj, Samy
- Subjects
DIABETIC nephropathies ,KIDNEY injuries ,TYPE 2 diabetes ,MICRORNA ,POLYMERASE chain reaction ,KIDNEY diseases ,DIABETES complications - Abstract
Background MicroRNAs (miRNAs) are small non-coding RNAs participating in post-transcriptional regulation of genes. Their key role in modulating the susceptibility to human diseases is now widely recognized, in particular in the context of cardiometabolic disorders. The aim of the present study was to identify miRNAs associated with diabetic nephropathy (DN) in patients with type 2 diabetes (T2D). Methods A next-generation sequencing-based miRNA profiling was performed in a case–control study for DN in plasma samples of 23 T2D patients with DN (cases) and 23 T2D without (controls). The main associations were confirmed using quantitative reverse transcription-polymerase chain reaction and tested for replication in an independent case–control collection of 100 T2D patients, 50 with DN and 50 without. Results From the 381 known mature miRNAs that were found highly expressed in the discovery samples, we observed and replicated an association between increased plasma levels of hsa-miR-152-3p and DN (P = 4.03 × 10
−4 in the combined samples). Hsa-miR-152-3p plasma levels were further found to be positively correlated (P = 0.003) to plasma osmolarity, a surrogate marker for solute carrier net activity, whose regulation is controlled by several genes including SLC5A3, one of the predicted targets of hsa-miR-152-3p. Conclusions We observed strong evidence for the association of hsa-miR-152-3p plasma levels and DN in patients with T2D, confirming an association previously observed in patients with type 1 diabetes. [ABSTRACT FROM AUTHOR]- Published
- 2018
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7. SLITRK2, an X-linked modifier of the age at onset in C9orf72 frontotemporal lobar degeneration.
- Author
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Barbier M, Camuzat A, Hachimi KE, Guegan J, Rinaldi D, Lattante S, Houot M, Sánchez-Valle R, Sabatelli M, Antonell A, Molina-Porcel L, Clot F, Couratier P, van der Ende E, van der Zee J, Manzoni C, Camu W, Cazeneuve C, Sellal F, Didic M, Golfier V, Pasquier F, Duyckaerts C, Rossi G, Bruni AC, Alvarez V, Gómez-Tortosa E, de Mendonça A, Graff C, Masellis M, Nacmias B, Oumoussa BM, Jornea L, Forlani S, Van Deerlin V, Rohrer JD, Gelpi E, Rademakers R, Van Swieten J, Le Guern E, Van Broeckhoven C, Ferrari R, Génin E, Brice A, and Le Ber I
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- Adult, Age of Onset, Aged, Aged, 80 and over, Cohort Studies, Female, Frontotemporal Lobar Degeneration epidemiology, Humans, Male, Middle Aged, Polymorphism, Single Nucleotide genetics, C9orf72 Protein genetics, Frontotemporal Lobar Degeneration diagnosis, Frontotemporal Lobar Degeneration genetics, Genes, X-Linked genetics, Genome-Wide Association Study methods, Membrane Proteins genetics, Nerve Tissue Proteins genetics
- Abstract
The G4C2-repeat expansion in C9orf72 is the most common cause of frontotemporal dementia and of amyotrophic lateral sclerosis. The variability of age at onset and phenotypic presentations is a hallmark of C9orf72 disease. In this study, we aimed to identify modifying factors of disease onset in C9orf72 carriers using a family-based approach, in pairs of C9orf72 carrier relatives with concordant or discordant age at onset. Linkage and association analyses provided converging evidence for a locus on chromosome Xq27.3. The minor allele A of rs1009776 was associated with an earlier onset (P = 1 × 10-5). The association with onset of dementia was replicated in an independent cohort of unrelated C9orf72 patients (P = 0.009). The protective major allele delayed the onset of dementia from 5 to 13 years on average depending on the cohort considered. The same trend was observed in an independent cohort of C9orf72 patients with extreme deviation of the age at onset (P = 0.055). No association of rs1009776 was detected in GRN patients, suggesting that the effect of rs1009776 was restricted to the onset of dementia due to C9orf72. The minor allele A is associated with a higher SLITRK2 expression based on both expression quantitative trait loci (eQTL) databases and in-house expression studies performed on C9orf72 brain tissues. SLITRK2 encodes for a post-synaptic adhesion protein. We further show that synaptic vesicle glycoprotein 2 and synaptophysin, two synaptic vesicle proteins, were decreased in frontal cortex of C9orf72 patients carrying the minor allele. Upregulation of SLITRK2 might be associated with synaptic dysfunctions and drives adverse effects in C9orf72 patients that could be modulated in those carrying the protective allele. How the modulation of SLITRK2 expression affects synaptic functions and influences the disease onset of dementia in C9orf72 carriers will require further investigations. In summary, this study describes an original approach to detect modifier genes in rare diseases and reinforces rising links between C9orf72 and synaptic dysfunctions that might directly influence the occurrence of first symptoms., (© The Author(s) (2021). Published by Oxford University Press on behalf of the Guarantors of Brain. All rights reserved. For permissions, please email: journals.permissions@oup.com.)
- Published
- 2021
- Full Text
- View/download PDF
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