Browsing by Author "Fernandez-Cadenas, I."
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- COL4A2 is associated with lacunar ischemic stroke and deep ICH: meta-analyses among 21,500 cases and 40,600 controlsPublication . Rannikmäe, K.; Sivakumaran, V.; Millar, H.; Malik, R.; Anderson, C.D.; Chong, M.; Dave, T.; Falcone, G.J.; Fernandez-Cadenas, I.; Jimenez-Conde, J.; Lindgren, A.; Montaner, J.; O'Donnell, M.; Paré, G.; Radmanesh, F.; Rost, N.S.; Slowik, A.; Söderholm, M.; Traylor, M.; Pulit, S.L.; Seshadri, S.; Worrall, B.B.; Woo, D.; Markus, H.S.; Mitchell, B.D.; Dichgans, M.; Rosand, J.; Sudlow, CLM; Stroke Genetics Network (SiGN); METASTROKE Collaboration; International Stroke Genetics Consortium (ISGC)Objective: To determine whether common variants in familial cerebral small vessel disease (SVD) genes confer risk of sporadic cerebral SVD. Methods: We meta-analyzed genotype data from individuals of European ancestry to determine associations of common single nucleotide polymorphisms (SNPs) in 6 familial cerebral SVD genes (COL4A1, COL4A2, NOTCH3, HTRA1, TREX1, and CECR1) with intracerebral hemorrhage (ICH) (deep, lobar, all; 1,878 cases, 2,830 controls) and ischemic stroke (IS) (lacunar, cardioembolic, large vessel disease, all; 19,569 cases, 37,853 controls). We applied data quality filters and set statistical significance thresholds accounting for linkage disequilibrium and multiple testing. Results: A locus in COL4A2 was associated (significance threshold p < 3.5 × 10−4) with both lacunar IS (lead SNP rs9515201: odds ratio [OR] 1.17, 95% confidence interval [CI] 1.11–1.24, p = 6.62 × 10−8) and deep ICH (lead SNP rs4771674: OR 1.28, 95% CI 1.13–1.44, p = 5.76 × 10−5). A SNP in HTRA1 was associated (significance threshold p < 5.5 × 10−4) with lacunar IS (rs79043147: OR 1.23, 95% CI 1.10–1.37, p = 1.90 × 10−4) and less robustly with deep ICH. There was no clear evidence for association of common variants in either COL4A2 or HTRA1 with non-SVD strokes or in any of the other genes with any stroke phenotype. Conclusions: These results provide evidence of shared genetic determinants and suggest common pathophysiologic mechanisms of distinct ischemic and hemorrhagic cerebral SVD stroke phenotypes, offering new insights into the causal mechanisms of cerebral SVD.
- Genetic risk factors for ischaemic stroke and its subtypes (the METASTROKE collaboration): a meta-analysis of genome-wide association studiesPublication . Traylor, M.; Farrall, M.; Holliday, E.G.; Sudlow, C.; Hopewell, J.C.; Cheng, Y.C.; Fornage, M.; Ikram, M.A.; Malik, R.; Bevan, S.; Thorsteinsdottir, U.; Nalls, M.A.; Longstreth, W.; Wiggins, K.L.; Yadav, S.; Parati, E.A.; Destefano, A.L.; Worrall, B.B.; Kittner, S.J.; Khan, M.S.; Reiner, A.P.; Helgadottir, A.; Achterberg, S.; Fernandez-Cadenas, I.; Abboud, S.; Schmidt, R.; Walters, M.; Chen, W.M.; Ringelstein, E.B.; O'Donnell, M.; Ho, W.K.; Pera, J.; Lemmens, R.; Norrving, B.; Higgins, P.; Benn, M.; Sale, M.; Kuhlenbäumer, G.; Doney, A.S.; Vicente, A.M.; Delavaran, H.; Algra, A.; Davies, G.; Oliveira, S.A.; Palmer, C.N.; Deary, I.; Schmidt, H.; Pandolfo, M.; Montaner, J.; Carty, C.; de Bakker, P.I.; Kostulas, K.; Ferro, J.M.; van Zuydam, N.R,; Valdimarsson, E.; Nordestgaard, B.G.; Lindgren, A.; Thijs, V.; Slowik, A.; Saleheen, D.; Paré, G.; Berger, K.; Thorleifsson, G.; Australian Stroke Genetics Collaborative, Wellcome Trust Case Control Consortium 2 (WTCCC2); Hofman, A.; Mosley, T.H.; Mitchell, B.D.; Furie, K.; Clarke, R.; Levi, C.; Seshadri, S.; Gschwendtner, A.; Boncoraglio, G.B.; Sharma, P.; Bis, J.C.; Gretarsdottir, S.; Psaty, B.M.; Rothwell, P.M.; Rosand, J.; Meschia, J.F.; Stefansson, K.; Dichgans, M.; Markus, H.S.; International Stroke Genetics Consortium.Various genome-wide association studies (GWAS) have been done in ischaemic stroke, identifying a few loci associated with the disease, but sample sizes have been 3500 cases or less. We established the METASTROKE collaboration with the aim of validating associations from previous GWAS and identifying novel genetic associations through meta-analysis of GWAS datasets for ischaemic stroke and its subtypes.
- TTC7B emerges as a novel risk factor for ischemic stroke through the convergence of several genome-wide approachesPublication . Krug, T.; Gabriel, J.P.; Taipa, R.; Fonseca, B.V.; Domingues-Montanari, S.; Fernandez-Cadenas, I.; Manso, H.; Gouveia, L.O.; Sobral, J.; Albergaria, I.; Gaspar, G.; Jiménez-Conde, J.; Rabionet, R.; Ferro, J.M.; Montaner, J.; Vicente, A.M.; Silva, M.R.; Matos, I.; Lopes, G.; Oliveira, S.A.We hereby propose a novel approach to the identification of ischemic stroke (IS) susceptibility genes that involves converging data from several unbiased genetic and genomic tools. We tested the association between IS and genes differentially expressed between cases and controls, then determined which data mapped to previously reported linkage peaks and were nominally associated with stroke in published genome-wide association studies. We first performed gene expression profiling in peripheral blood mononuclear cells of 20 IS cases and 20 controls. Sixteen differentially expressed genes mapped to reported whole-genome linkage peaks, including the TTC7B gene, which has been associated with major cardiovascular disease. At the TTC7B locus, 46 tagging polymorphisms were tested for association in 565 Portuguese IS cases and 520 controls. Markers nominally associated in at least one test and defining associated haplotypes were then examined in 570 IS Spanish cases and 390 controls. Several polymorphisms and haplotypes in the intron 5-intron 6 region of TTC7B were also associated with IS risk in the Spanish and combined data sets. Multiple independent lines of evidence therefore support the role of TTC7B in stroke susceptibility, but further work is warranted to identify the exact risk variant and its pathogenic potential.