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1. Mendelian randomization integrating GWAS and eQTL data reveals genetic determinants of complex and clinical traits

Author

Porcu, E. (Eleonora), Rueger, S. (Sina), Lepik, K. (Kaido), Agbessi, M. (Mawusse), Ahsan, H. (Habibul), Alves, I. (Isabel), Andiappan, A. (Anand), Arindrarto, W. (Wibowo), Awadalla, P. (Philip), Battle, A. (Alexis), Beutner, F. (Frank), Bonder, M. J. (Marc Jan), Boomsma, D. (Dorret), Christiansen, M. (Mark), Claringbould, A. (Annique), Deelen, P. (Patrick), Esko, T. (Tonu), Fave, M.-J. (Marie-Julie), Franke, L. (Lude), Frayling, T. (Timothy), Gharib, S. A. (Sina A.), Gibson, G. (Gregory), Heijmans, B. T. (Bastiaan T.), Hemani, G. (Gibran), Jansen, R. (Rick), Kahonen, M. (Mika), Kalnapenkis, A. (Anette), Kasela, S. (Silva), Kettunen, J. (Johannes), Kim, Y. (Yungil), Kirsten, H. (Holger), Kovacs, P. (Peter), Krohn, K. (Knut), Kronberg-Guzman, J. (Jaanika), Kukushkina, V. (Viktorija), Lee, B. (Bernett), Lehtimaki, T. (Terho), Loeffler, M. (Markus), Marigorta, U. M. (Urko M.), Mei, H. (Hailang), Milani, L. (Lili), Montgomery, G. W. (Grant W.), Mueler-Nurasyid, M. (Martina), Nauck, M. (Matthias), Nivard, M. (Michel), Penninx, B. (Brenda), Perola, M. (Markus), Pervjakova, N. (Natalia), Pierce, B. L. (Brandon L.), Powell, J. (Joseph), Prokisch, H. (Holger), Psaty, B. M. (Bruce M.), Raitakari, O. T. (Olli T.), Ripatti, S. (Samuli), Rotzschke, O. (Olaf), Saha, A. (Ashis), Scholz, M. (Markus), Schramm, K. (Katharina), Seppala, I. (Ilkka), Slagboom, E. P. (Eline P.), Stehouwer, C. D. (Coen D. A.), Stumvoll, M. (Michael), Sullivan, P. (Patrick), Teumer, A. (Alexander), Thiery, J. (Joachim), Tong, L. (Lin), Tonjes, A. (Anke), van Dongen, J. (Jenny), van Iterson, M. (Maarten), van Meurs, J. (Joyce), Veldink, J. H. (Jan H.), Verlouw, J. (Joost), Visscher, P. M. (Peter M.), Volker, U. (Uwe), Vosa, U. (Urmo), Westra, H.-J. (Harm-Jan), Wijmenga, C. (Cisca), Yaghootkar, H. (Hanieh), Yang, J. (Jian), Zeng, B. (Biao), Zhang, F. (Futao), Beekman, M. (Marian), Boomsma, D. I. (Dorret I.), Bot, J. (Jan), Deelen, J. (Joris), Hofman, B. A. (Bert A.), Hottenga, J. J. (Jouke J.), Isaacs, A. (Aaron), Jhamai, P. M. (P. Mila), Kielbasa, S. M. (Szymon M.), Lakenberg, N. (Nico), Luijk, R. (Rene), Mei, H. (Hailiang), Moed, M. (Matthijs), Nooren, I. (Irene), Pool, R. (Rene), Schalkwijk, C. G. (Casper G.), Slagboom, P. E. (P. Eline), Suchiman, H. E. (H. Eka D.), Swertz, M. A. (Morris A.), Tigchelaar, E. F. (Ettje F.), Uitterlinden, A. G. (Andre G.), van den Berg, L. H. (Leonard H.), van der Breggen, R. (Ruud), van der Kallen, C. J. (Carla J. H.), van Dijk, F. (Freerk), van Duijn, C. M. (Cornelia M.), van Galen, M. (Michiel), van Greevenbroek, M. M. (Marleen M. J.), van Heemst, D. (Diana), van Rooij, J. (Jeroen), Van't Hof, P. (Peter), van Zwet, E. W. (Erik. W.), Vermaat, M. (Martijn), Verbiest, M. (Michael), Verkerk, M. (Marijn), Zhernakova, D. V. (Dasha V.), Zhernakova, S. (Sasha), Santoni, F. A. (Federico A.), Reymond, A. (Alexandre), and Kutalik, Z. (Zoltan)

Abstract

Genome-wide association studies (GWAS) have identified thousands of variants associated with complex traits, but their biological interpretation often remains unclear. Most of these variants overlap with expression QTLs, indicating their potential involvement in regulation of gene expression. Here, we propose a transcriptome-wide summary statistics-based Mendelian Randomization approach (TWMR) that uses multiple SNPs as instruments and multiple gene expression traits as exposures, simultaneously. Applied to 43 human phenotypes, it uncovers 3,913 putatively causal gene–trait associations, 36% of which have no genome-wide significant SNP nearby in previous GWAS. Using independent association summary statistics, we find that the majority of these loci were missed by GWAS due to power issues. Noteworthy among these links is educational attainment-associated BSCL2, known to carry mutations leading to a Mendelian form of encephalopathy. We also find pleiotropic causal effects suggestive of mechanistic connections. TWMR better accounts for pleiotropy and has the potential to identify biological mechanisms underlying complex traits.

Published
2019

2. Autosomal genetic variation is associated with DNA methylation in regions variably escaping X-chromosome inactivation

Author

Luijk, R. (René), Wu, H. (Haoyu), Ward-Caviness, C.K. (Cavin K.), Hannon, E. (Eilis), Carnero-Montoro, E. (Elena), Min, J. (Josine), Mandaviya, P.R. (Pooja), Müller-Nurasyid, M. (Martina), Mei, H. (Hailiang), Maarel, S.M. (Silvre) van der, Beekman, M. (Marian), der Breggen, R. (Ruud van), Deelen, J. (Joris), Lakenberg, N. (Nico), Moed, H. (Heleen), Suchiman, H.E.D. (Eka), Arindrarto, W. (Wibowo), van’t Hof, P. (Peter), Jan Bonder, M. (Marc), Deelen, P. (Patrick), Tigchelaar, E.F. (Ettje F.), Zhernakova, A. (Alexandra), Zhernakova, D.V. (Dasha V.), Dongen, J. (Jenny) van, Hottenga, J.J. (Jouke Jan), Pool, R. (Reńe), Isaacs, A. (Aaron), Hofman, B.A. (Bert A.), Jhamai, M. (Mila), Kallen, C.J. van der, Schalkwijk, C.G. (Casper), Stehouwer, C.D. (Coen), Berg, L.H. (Leonard) van den, Van Galen, M. (Michiel), Vermaat, M. (Martijn), van Rooij, J. (Jeroen), Uitterlinden, A.G. (André), Verbiest, M.M.P.J. (Michael), Verkerk, M. (Marijn), Kielbasa, P.S.M. (P. Szymon M.), Bot, J.J. (Jan), Nooren, I. (Irene), Dijk, F. (Freerk) van, Swertz, M.A. (Morris A.), Heemst, D. (Diana) van, Relton, C.L. (Caroline), Mill, J. (Jonathan), Waldenberger, M. (Melanie), Bell, J.T. (Jordana T.), Jansen, R. (Rick), Franke, L. (Lude), ‘t Hoen, P.A.C. (Peter A. C.), Boomsma, D.I. (Dorret), Duijn, C.M. (Cornelia) van, Greevenbroek, M.M. van, Veldink, J.H. (Jan), Wijmenga, C. (Cisca), Meurs, J.B.J. (Joyce) van, Daxinger, L. (Lucia), Slagboom, P.E. (Eline), Zwet, E.W. (Erik) van, Heijmans, B.T. (Bastiaan T.), Luijk, R. (René), Wu, H. (Haoyu), Ward-Caviness, C.K. (Cavin K.), Hannon, E. (Eilis), Carnero-Montoro, E. (Elena), Min, J. (Josine), Mandaviya, P.R. (Pooja), Müller-Nurasyid, M. (Martina), Mei, H. (Hailiang), Maarel, S.M. (Silvre) van der, Beekman, M. (Marian), der Breggen, R. (Ruud van), Deelen, J. (Joris), Lakenberg, N. (Nico), Moed, H. (Heleen), Suchiman, H.E.D. (Eka), Arindrarto, W. (Wibowo), van’t Hof, P. (Peter), Jan Bonder, M. (Marc), Deelen, P. (Patrick), Tigchelaar, E.F. (Ettje F.), Zhernakova, A. (Alexandra), Zhernakova, D.V. (Dasha V.), Dongen, J. (Jenny) van, Hottenga, J.J. (Jouke Jan), Pool, R. (Reńe), Isaacs, A. (Aaron), Hofman, B.A. (Bert A.), Jhamai, M. (Mila), Kallen, C.J. van der, Schalkwijk, C.G. (Casper), Stehouwer, C.D. (Coen), Berg, L.H. (Leonard) van den, Van Galen, M. (Michiel), Vermaat, M. (Martijn), van Rooij, J. (Jeroen), Uitterlinden, A.G. (André), Verbiest, M.M.P.J. (Michael), Verkerk, M. (Marijn), Kielbasa, P.S.M. (P. Szymon M.), Bot, J.J. (Jan), Nooren, I. (Irene), Dijk, F. (Freerk) van, Swertz, M.A. (Morris A.), Heemst, D. (Diana) van, Relton, C.L. (Caroline), Mill, J. (Jonathan), Waldenberger, M. (Melanie), Bell, J.T. (Jordana T.), Jansen, R. (Rick), Franke, L. (Lude), ‘t Hoen, P.A.C. (Peter A. C.), Boomsma, D.I. (Dorret), Duijn, C.M. (Cornelia) van, Greevenbroek, M.M. van, Veldink, J.H. (Jan), Wijmenga, C. (Cisca), Meurs, J.B.J. (Joyce) van, Daxinger, L. (Lucia), Slagboom, P.E. (Eline), Zwet, E.W. (Erik) van, and Heijmans, B.T. (Bastiaan T.)

Abstract

X-chromosome inactivation (XCI), i.e., the inactivation of one of the female X chromosomes, restores equal expression of X-chromosomal genes between females and males. However, ~10% of genes show variable degrees of escape from XCI between females, although little is known about the causes of variable XCI. Using a discovery data-set of 1867 females and 1398 males and a replication sample of 3351 females, we show that genetic variation at three autosomal loci is associated with female-specific changes in X-chromosome methylation. Through cis-eQTL expression analysis, we map these loci to the genes SMCHD1/METTL4, TRIM6/HBG2, and ZSCAN9. Low-expression alleles of the loci are predominantly associated with mild hypomethylation of CpG islands near genes known to variably escape XCI, implicating the autosomal genes in variable XCI. Together, these results suggest a genetic basis for variable escape from XCI and highlight the potential of a population genomics approach to identify genes involved in XCI.

Published
2018
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3. Skewed X-inactivation is common in the general female population

Author

Shvetsova, E. (Ekaterina), Sofronova, A. (Alina), Monajemi, R. (Ramin), Gagalova, K. (Kristina), Draisma, G. (Gerrit), White, S.J. (Stefan), Santen, G.W.E. (Gijs), Chuva De Sousa Lopes, S.M. (Susana M.), Heijmans, B.T. (Bastiaan T.), van Meurs, J. (Joyce), Jansen, R. (Rick), Franke, L. (Lude), Kielbasa, S.M. (Szymon M.), Dunnen, J.T. (Johan) den, ‘t Hoen, P.A.C. (Peter A. C.), Heijmans, B.T. (Bastiaan T), Meurs, J.B.J. (Joyce) van, Boomsma, D.I. (Dorret), Pool, R. (Reńe), Dongen, J. (Jenny) van, Hottenga, J.J. (Jouke Jan), Greevenbroek, M.M. van, Stehouwer, C.D. (Coen Da), Kallen, C.J. van der, Schalkwijk, C.G. (Casper), Wijmenga, C. (Cisca), Zhernakova, S. (Sasha), Tigchelaar, E.F. (Ettje F.), Slagboom, P.E. (Eline), Beekman, M. (Marian), Deelen, J. (Joris), Heemst, D. (Diana) van, Veldink, J.H. (Jan), Berg, L.H. (Leonard) van den, Duijn, C.M. (Cornelia) van, Hofman, B.A. (Bert A), Uitterlinden, A.G. (André), Jhamai, P.M. (Mila), Verbiest, M.M.P.J. (Michael), Suchiman, H.E.D. (H Eka D), Verkerk, M. (Marijn), Breggen, R. (Ruud) van der, van Rooij, J. (Jeroen), Lakenberg, N. (Nico), Mei, S. (Shan), Bot, J. (Jan), Zhernakova, D.V. (Dasha V), van ’t Hof, P. (Peter), Deelen, P. (Patrick), Nooren, I. (Irene), Moed, H. (Heleen), Vermaat, M. (Martijn), Luijk, R. (René), Jan Bonder, M. (Marc), Iterson, M. (Maarten) van, van Dijk, F. (Freerk), Van Galen, M. (Michiel), Arindrarto, W. (Wibowo), Swertz, M.A. (Morris A), Zwet, E.W. (Erik) van, Isaacs, A.J. (Aaron), Francioli, L.C. (Laurent), Menelaou, A. (Androniki), Pulit, S.L. (Sara), Dijk, F. (Freerk) van, Palamara, P.F. (Pier Francesco), Elbers, C.C. (Clara), Neerincx, P.B.T. (Pieter B T), Ye, K. (K.), Guryev, V. (Victor), Kloosterman, W. (Wp), Abdellaoui, A. (Abdel), van Leeuwen, E. (Em), Oven, M. (Mannis) van, Li, M. (M.), Laros, J. (Jf), Karssen, L.C. (Lennart), Kanterakis, A. (Alexandros), Amin, N. (Najaf), Hottenga, J. (Jj), Lameijer, E. (Ew), Kattenberg, V.M. (Mathijs), Dijkstra, M. (Martijn), Byelas, H. (Heorhiy), Setten, J. (Jessica) van, van Schaik, B. (Bd), Bot, J.J. (Jan), Nijman, I. (Ij), Renkens, I. (Ivo), Marschall, T. (Tanja), Schönhuth, A. (A.), Hehir-Kwa, J. (Jayne), Handsaker, R.E. (Robert), Polak, P., Sohail, M. (Mashaal), Vuzman, D. (Dana), Hormozdiari, F. (Fereydoun), Enckevort, D. (David) van, Mei, H. (H.), Koval, V. (Vyacheslav), Moed, M. (Mh), van der Velde, K. (Kj), Rivadeneira Ramirez, F. (Fernando), Estrada Gil, K. (Karol), Medina-Gomez, M.C. (Carolina), McCarroll, S. (Sa), de Craen, A. (Aj), Suchiman, H. (He), Hofman, B. (Ba), Oostra, B.A. (Ben), Uitterlinden, A. (Ag), Willemsen, G.A.H.M. (Gonneke), Platteel, I. (Inge), Veldink, J. (Jh), van den Berg, L. (Lh), Pitts, S. (Sj), Potluri, S. (Shobha), Sundar, P. (Purnima), Cox, D. (Dr), Sunyaev, S. (Sr), den Dunnen, J. (Jt), Stoneking, M. (Mark), Knijff, P. (Peter) de, Kayser, M.H. (Manfred), Li, Q. (Q.), Li, Y. (Y.), Du, Y. (Y.), Chen, R. (R.), Cao, H. (H.), Li, N. (N.), Cao, S. (Sherry), Wang, J. (J.), Bovenberg, J.A. (Jasper), Peer, I. (Itsik), Slagboom, P. (Pe), van Duijn, C. (Cm), Boomsma, D. (Di), van Ommen, G. (Gj), de Bakker, P. (Pi), Swertz, M. (Ma), Wijmenga, C. (C.), Shvetsova, E. (Ekaterina), Sofronova, A. (Alina), Monajemi, R. (Ramin), Gagalova, K. (Kristina), Draisma, G. (Gerrit), White, S.J. (Stefan), Santen, G.W.E. (Gijs), Chuva De Sousa Lopes, S.M. (Susana M.), Heijmans, B.T. (Bastiaan T.), van Meurs, J. (Joyce), Jansen, R. (Rick), Franke, L. (Lude), Kielbasa, S.M. (Szymon M.), Dunnen, J.T. (Johan) den, ‘t Hoen, P.A.C. (Peter A. C.), Heijmans, B.T. (Bastiaan T), Meurs, J.B.J. (Joyce) van, Boomsma, D.I. (Dorret), Pool, R. (Reńe), Dongen, J. (Jenny) van, Hottenga, J.J. (Jouke Jan), Greevenbroek, M.M. van, Stehouwer, C.D. (Coen Da), Kallen, C.J. van der, Schalkwijk, C.G. (Casper), Wijmenga, C. (Cisca), Zhernakova, S. (Sasha), Tigchelaar, E.F. (Ettje F.), Slagboom, P.E. (Eline), Beekman, M. (Marian), Deelen, J. (Joris), Heemst, D. (Diana) van, Veldink, J.H. (Jan), Berg, L.H. (Leonard) van den, Duijn, C.M. (Cornelia) van, Hofman, B.A. (Bert A), Uitterlinden, A.G. (André), Jhamai, P.M. (Mila), Verbiest, M.M.P.J. (Michael), Suchiman, H.E.D. (H Eka D), Verkerk, M. (Marijn), Breggen, R. (Ruud) van der, van Rooij, J. (Jeroen), Lakenberg, N. (Nico), Mei, S. (Shan), Bot, J. (Jan), Zhernakova, D.V. (Dasha V), van ’t Hof, P. (Peter), Deelen, P. (Patrick), Nooren, I. (Irene), Moed, H. (Heleen), Vermaat, M. (Martijn), Luijk, R. (René), Jan Bonder, M. (Marc), Iterson, M. (Maarten) van, van Dijk, F. (Freerk), Van Galen, M. (Michiel), Arindrarto, W. (Wibowo), Swertz, M.A. (Morris A), Zwet, E.W. (Erik) van, Isaacs, A.J. (Aaron), Francioli, L.C. (Laurent), Menelaou, A. (Androniki), Pulit, S.L. (Sara), Dijk, F. (Freerk) van, Palamara, P.F. (Pier Francesco), Elbers, C.C. (Clara), Neerincx, P.B.T. (Pieter B T), Ye, K. (K.), Guryev, V. (Victor), Kloosterman, W. (Wp), Abdellaoui, A. (Abdel), van Leeuwen, E. (Em), Oven, M. (Mannis) van, Li, M. (M.), Laros, J. (Jf), Karssen, L.C. (Lennart), Kanterakis, A. (Alexandros), Amin, N. (Najaf), Hottenga, J. (Jj), Lameijer, E. (Ew), Kattenberg, V.M. (Mathijs), Dijkstra, M. (Martijn), Byelas, H. (Heorhiy), Setten, J. (Jessica) van, van Schaik, B. (Bd), Bot, J.J. (Jan), Nijman, I. (Ij), Renkens, I. (Ivo), Marschall, T. (Tanja), Schönhuth, A. (A.), Hehir-Kwa, J. (Jayne), Handsaker, R.E. (Robert), Polak, P., Sohail, M. (Mashaal), Vuzman, D. (Dana), Hormozdiari, F. (Fereydoun), Enckevort, D. (David) van, Mei, H. (H.), Koval, V. (Vyacheslav), Moed, M. (Mh), van der Velde, K. (Kj), Rivadeneira Ramirez, F. (Fernando), Estrada Gil, K. (Karol), Medina-Gomez, M.C. (Carolina), McCarroll, S. (Sa), de Craen, A. (Aj), Suchiman, H. (He), Hofman, B. (Ba), Oostra, B.A. (Ben), Uitterlinden, A. (Ag), Willemsen, G.A.H.M. (Gonneke), Platteel, I. (Inge), Veldink, J. (Jh), van den Berg, L. (Lh), Pitts, S. (Sj), Potluri, S. (Shobha), Sundar, P. (Purnima), Cox, D. (Dr), Sunyaev, S. (Sr), den Dunnen, J. (Jt), Stoneking, M. (Mark), Knijff, P. (Peter) de, Kayser, M.H. (Manfred), Li, Q. (Q.), Li, Y. (Y.), Du, Y. (Y.), Chen, R. (R.), Cao, H. (H.), Li, N. (N.), Cao, S. (Sherry), Wang, J. (J.), Bovenberg, J.A. (Jasper), Peer, I. (Itsik), Slagboom, P. (Pe), van Duijn, C. (Cm), Boomsma, D. (Di), van Ommen, G. (Gj), de Bakker, P. (Pi), Swertz, M. (Ma), and Wijmenga, C. (C.)

Abstract

X-inactivation is a well-established dosage compensation mechanism ensuring that X-chromosomal genes are expressed at comparable levels in males and females. Skewed X-inactivation is often explained by negative selection of one of the alleles. We demonstrate that imbalanced expression of the paternal and maternal X-chromosomes is common in the general population and that the random nature of the X-inactivation mechanism can be sufficient to explain the imbalance. To this end, we analyzed blood-derived RNA and whole-genome sequencing data from 79 female children and their parents from the Genome of the Netherlands project. We calculated the median ratio of the paternal over total counts at all X-chromosomal heterozygous single-nucleotide variants with coverage ≥10. We identified two individuals where the same X-chromosome was inactivated in all cells. Imbalanced expression of the two X-chromosomes (ratios ≤0.35 or ≥0.65) was observed in nearly 50% of the population. The empirically observed skewing is explained by a theoretical model where X-inactivation takes place in an embryonic stage in which eight cells give rise to the hematopoietic compartment. Genes escaping X-inactivation are expressed from both alleles and therefore demonstrate less skewing than inactivated genes. Using this characteristic, we identified three novel escapee genes (SSR4, REPS2, and SEPT6), but did not find support for many previously reported escapee genes in blood. Our collective data suggest that skewed X-inactivation is common in the general population. This may contribute to manifestation of symptoms in carriers of recessive X-linked disorders. We recommend that X-inactivation results should not be used lightly in the interpretation of X-linked variants.

Published
2018
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4. Genome-wide identification of directed gene networks using large-scale population genomics data

Author

Luijk, R. (René), Dekkers, K.F. (Koen F.), Iterson, M. (Maarten) van, Arindrarto, W. (Wibowo), Claringbould, A. (Annique), Hop, P. (Paul), Beekman, M. (Marian), Breggen, R. (Ruud) van der, Deelen, J. (Joris), Lakenberg, N. (Nico), Moed, H. (Heleen), Suchiman, H.E.D. (Eka), van ’t Hof, P. (Peter), Bonder, M.J. (Marc), Deelen, P. (Patrick), Tigchelaar, E.F. (Ettje F.), Zhernakova, A. (Alexandra), Zhernakova, D.V. (Dasha V.), Dongen, J. (Jenny) van, Hottenga, J.J. (Jouke Jan), Pool, R. (Reńe), Isaacs, A. (Aaron), Hofman, B.A. (Bert A.), Jhamai, M. (Mila), Kallen, C.J. van der, Schalkwijk, C.G. (Casper), Stehouwer, C.D. (Coen), Berg, L.H. (Leonard) van den, Van Galen, M. (Michiel), Vermaat, M. (Martijn), van Rooij, J. (Jeroen), Uitterlinden, A.G. (André), Verbiest, M.M.P.J. (Michael), Verkerk, M. (Marijn), Kielbasa, P.S.M. (P. Szymon M.), Bot, J.J. (Jan), Nooren, I. (Irene), Dijk, F. (Freerk) van, Swertz, M.A. (Morris A.), Heemst, D. (Diana) van, Boomsma, D.I. (Dorret I.), Duijn, C.M. (Cornelia) van, Greevenbroek, M.M. van, Veldink, J.H. (Jan), Wijmenga, C. (Cisca), Franke, L. (Lude), ’t Hoen, P.A.C. (Peter A. C.), Jansen, R. (Rick), Meurs, J.B.J. (Joyce) van, Mei, H. (Hailiang), Slagboom, P.E. (Eline), Heijmans, B.T. (Bastiaan T.), Zwet, E.W. (Erik) van, Luijk, R. (René), Dekkers, K.F. (Koen F.), Iterson, M. (Maarten) van, Arindrarto, W. (Wibowo), Claringbould, A. (Annique), Hop, P. (Paul), Beekman, M. (Marian), Breggen, R. (Ruud) van der, Deelen, J. (Joris), Lakenberg, N. (Nico), Moed, H. (Heleen), Suchiman, H.E.D. (Eka), van ’t Hof, P. (Peter), Bonder, M.J. (Marc), Deelen, P. (Patrick), Tigchelaar, E.F. (Ettje F.), Zhernakova, A. (Alexandra), Zhernakova, D.V. (Dasha V.), Dongen, J. (Jenny) van, Hottenga, J.J. (Jouke Jan), Pool, R. (Reńe), Isaacs, A. (Aaron), Hofman, B.A. (Bert A.), Jhamai, M. (Mila), Kallen, C.J. van der, Schalkwijk, C.G. (Casper), Stehouwer, C.D. (Coen), Berg, L.H. (Leonard) van den, Van Galen, M. (Michiel), Vermaat, M. (Martijn), van Rooij, J. (Jeroen), Uitterlinden, A.G. (André), Verbiest, M.M.P.J. (Michael), Verkerk, M. (Marijn), Kielbasa, P.S.M. (P. Szymon M.), Bot, J.J. (Jan), Nooren, I. (Irene), Dijk, F. (Freerk) van, Swertz, M.A. (Morris A.), Heemst, D. (Diana) van, Boomsma, D.I. (Dorret I.), Duijn, C.M. (Cornelia) van, Greevenbroek, M.M. van, Veldink, J.H. (Jan), Wijmenga, C. (Cisca), Franke, L. (Lude), ’t Hoen, P.A.C. (Peter A. C.), Jansen, R. (Rick), Meurs, J.B.J. (Joyce) van, Mei, H. (Hailiang), Slagboom, P.E. (Eline), Heijmans, B.T. (Bastiaan T.), and Zwet, E.W. (Erik) van

Abstract

Identification of causal drivers behind regulatory gene networks is crucial in understanding gene function. Here, we develop a method for the large-scale inference of gene–gene interactions in observational population genomics data that are both directed (using local genetic instruments as causal anchors, akin to Mendelian Randomization) and specific (by controlling for linkage disequilibrium and pleiotropy). Analysis of genotype and whole-blood RNA-sequencing data from 3072 individuals identified 49 genes as drivers of downstream transcriptional changes (Wald P < 7 × 10−10), among which transcription factors were overrepresented (Fisher’s P = 3.3 × 10−7). Our analysis suggests new gene functions and targets, including for SENP7 (zinc-finger genes involved in retroviral repression) and BCL2A1 (target genes possibly involved in auditory dysfunction). Our work highlights the utility of population genomics data in deriving directed gene expression networks. A resource of trans-effects for all 6600 genes with a genetic instrument can be explored individually using a web-based browser.

Published
2018
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5. To the editor: Uncompromised 10-year survival of oldest old carrying somatic mutations in DNMT3A and TET2

Author

Akker, E.B. (Erik) van den, Pitts, S.J. (Steven J.), Deelen, J. (Joris), Moed, H. (Heleen), Potluri, S. (Shobha), Rooij, J.G.J. (Jeroen) van, Suchiman, H.E.D. (Eka), Lakenberg, N. (Nico), De Dijcker, W.J. (Wesley J.), Uitterlinden, A.G. (André), Kraaij, R. (Robert), Hofman, A. (Albert), De Craen, A.J.M. (Anton J. M.), Houwing-Duistermaat, J.J. (Jeanine), Van Ommen, G.-J.B. (Gert-Jan B.), Cox, D.R. (David), Meurs, J.B.J. (Joyce) van, Beekman, M. (Marian), Reinders, M.J. (Marcel), Slagboom, P.E. (Eline), Akker, E.B. (Erik) van den, Pitts, S.J. (Steven J.), Deelen, J. (Joris), Moed, H. (Heleen), Potluri, S. (Shobha), Rooij, J.G.J. (Jeroen) van, Suchiman, H.E.D. (Eka), Lakenberg, N. (Nico), De Dijcker, W.J. (Wesley J.), Uitterlinden, A.G. (André), Kraaij, R. (Robert), Hofman, A. (Albert), De Craen, A.J.M. (Anton J. M.), Houwing-Duistermaat, J.J. (Jeanine), Van Ommen, G.-J.B. (Gert-Jan B.), Cox, D.R. (David), Meurs, J.B.J. (Joyce) van, Beekman, M. (Marian), Reinders, M.J. (Marcel), and Slagboom, P.E. (Eline)

Published
2016
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6. Underlying molecular mechanisms of DIO2 susceptibility in symptomatic osteoarthritis

Author

Bomer, N. (Nils), Hollander, W. (Wouter) den, Ramos, Y.F.M. (Yolande), Bos, S.D. (Steffan), Breggen, R. (Ruud) van der, Lakenberg, N. (Nico), Pepers, B.A. (Barry), Eeden, A.E. (Annelies) van, Darvishan, A. (Arash), Tobi, E.W. (Elmar), Duijnisveld, B.J. (Bouke), Akker, E.B. (Erik) van den, Heijmans, B.T. (Bastiaan), Roon-Mom, W.M.C. (Willeke) van, Verbeek, F.J. (Fons), Osch, G.J.V.M. (Gerjo) van, Nelissen, R.G.H.H. (Rob), Slagboom, P.E. (Eline), Meulenbelt, I. (Ingrid), Bomer, N. (Nils), Hollander, W. (Wouter) den, Ramos, Y.F.M. (Yolande), Bos, S.D. (Steffan), Breggen, R. (Ruud) van der, Lakenberg, N. (Nico), Pepers, B.A. (Barry), Eeden, A.E. (Annelies) van, Darvishan, A. (Arash), Tobi, E.W. (Elmar), Duijnisveld, B.J. (Bouke), Akker, E.B. (Erik) van den, Heijmans, B.T. (Bastiaan), Roon-Mom, W.M.C. (Willeke) van, Verbeek, F.J. (Fons), Osch, G.J.V.M. (Gerjo) van, Nelissen, R.G.H.H. (Rob), Slagboom, P.E. (Eline), and Meulenbelt, I. (Ingrid)

Abstract

Objectives: To investigate how the genetic susceptibility gene DIO2 confers risk to osteoarthritis (OA) onset in humans and to explore whether counteracting the deleterious effect could contribute to novel therapeutic approaches. Methods: Epigenetically regulated expression of DIO2 was explored by assessing methylation of positional CpG-dinucleotides and the respective DIO2 expression in OA-affected and macroscopically preserved articular cartilage from end-stage OA patients. In a human in vitro chondrogenesis model, we measured the effects when thyroid signalling during culturing was either enhanced (excess T3 or lentiviral induced DIO2 overexpression) or decreased (iopanoic acid). Results: OA-related changes in methylation at a specific CpG dinucleotide upstream of DIO2 caused significant upregulation of its expression (ß=4.96; p=0.0016). This effect was enhanced and appeared driven specifically by DIO2 rs225014 risk allele carriers (ß=5.58, p=0.0006). During in vitro chondrogenesis, DIO2 overexpression resulted in a significant reduced capacity of chondrocytes to deposit extracellular matrix (ECM) components, concurrent with significant induction of ECM degrading enzymes (ADAMTS5, MMP13) and markers of mineralisation (ALPL, COL1A1). Given their concurrent and significant upregulation of expression, this process is likely mediated via HIF-2a/RUNX2 signalling. In contrast, we showed that inhibiting deiodinases during in vitro chondrogenesis contributed to prolonged cartilage homeostasis as reflected by significant increased deposition of ECM components and attenuated upregulation of matrix degrading enzymes. Conclusions: Our findings show how genetic variation at DIO2 could confer risk to OA and raised the possibility that counteracting thyroid signalling may be a novel therapeutic approach.

Published
2014
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7. Identification of DIO2 as a new susceptibility locus for symptomatic osteoarthritis

Author

Meulenbelt, I. (Ingrid), Min, J. (Josine), Bos, S.D. (Steffan), Riyazi, N. (Naghmeh), Houwing-Duistermaat, J.J. (Jeanine), Wijk, H.J. van der, Kroon, H.M. (Herman), Nakajima, M., Ikegawa, S. (Shiro), Uitterlinden, A.G. (André), Meurs, J.B.J. (Joyce) van, Deure, W.M. (Wendy) van der, Visser, T.J. (Theo), Seymour, A.B. (Albert), Lakenberg, N. (Nico), Breggen, R. (Ruud) van der, Kremer, D. (Dennis), Tikka-Kleemola, P. (Päivi), Kloppenburg, M. (Margreet), Loughlin, J. (John), Slagboom, P.E. (Eline), Meulenbelt, I. (Ingrid), Min, J. (Josine), Bos, S.D. (Steffan), Riyazi, N. (Naghmeh), Houwing-Duistermaat, J.J. (Jeanine), Wijk, H.J. van der, Kroon, H.M. (Herman), Nakajima, M., Ikegawa, S. (Shiro), Uitterlinden, A.G. (André), Meurs, J.B.J. (Joyce) van, Deure, W.M. (Wendy) van der, Visser, T.J. (Theo), Seymour, A.B. (Albert), Lakenberg, N. (Nico), Breggen, R. (Ruud) van der, Kremer, D. (Dennis), Tikka-Kleemola, P. (Päivi), Kloppenburg, M. (Margreet), Loughlin, J. (John), and Slagboom, P.E. (Eline)

Abstract

Osteoarthritis [MIM 165720] is a common late-onset articular joint disease for which no pharmaceutical intervention is available to attenuate the cartilage degeneration. To identify a new osteoarthritis susceptibility locus, a genome-wide linkage scan and combined linkage association analysis were applied to 179 affected siblings and four trios with generalized osteoarthritis (The GARP study). We tested, for confirmation by association, 1478 subjects who required joint replacement and 734 controls in a UK population. Additional replication was tested in 1582 population-based females from the Rotterdam study that contained 94 cases with defined hip osteoarthritis and in 267 Japanese females with symptomatic hip osteoarthritis and 465 controls. Suggested evidence for linkage in the GARP study was observed on chromosome 14q32.11 (log of odds = 3.03, P = 1.9 × 10-4). Genotyping tagging single-nucleotide polymorphisms covering three important candidate genes revealed a common coding variant (rs225014; Thr92Ala) in the iodothyronine-deiodinase enzyme type 2 (D2) gene (DIO2 [MIM 601413]) which significantly explained the linkage signal (P = 0.006). Confirmation and replication by association in the additional osteoarthritis studies indicated a common DIO2 haplotype, exclusively containing the minor allele of rs225014 and common allele of rs12885300, with a combined recessive odds ratio of 1.79, 95% confidence interval (CI) 1.37-2.34 with P = 2.02 × 10-5in female cases with advanced/symptomatic hip osteoarthritis. The gene product of this DIO2 converts intracellular pro-hormone-3,3′,5,5′-tetraiodothyronine (T4) into the active thyroid hormone 3,3′,5-triiodothyronine (T3) thereby regulating intracellular levels of active T3 in target tissues such as the growth plate. Our results indicate a new susceptibility gene (DIO2) conferring risk to osteoarthritis.

Published
2008
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