Genome-wide analyses of ADHD identify 27 risk loci, refine the genetic architecture and implicate several cognitive domains
Author:
Demontis Ditte, Walters G. Bragi, Athanasiadis Georgios, Walters Raymond, Therrien Karen, Farajzadeh Leila, Voloudakis GeorgiosORCID, Bendl Jaroslav, Zeng Biao, Zhang Wen, Grove Jakob, Als Thomas D., Duan Jinjie, Satterstrom F. Kyle, Bybjerg-Grauholm Jonas, Bækved-Hansen Marie, Gudmundsson Olafur O., Magnusson Sigurdur H., Baldursson Gisli, Davidsdottir Katrin, Haraldsdottir Gyda S., Nielsen Trine Tollerup, Agerbo EsbenORCID, Hoffman Gabriel E.ORCID, Dalsgaard Søren, Martin JoannaORCID, Ribasés Marta, Boomsma Dorret I.ORCID, Artigas Maria Soler, Mota Nina Roth, Howrigan Daniel, Medland Sarah E., Zayats Tetyana, Manikandan Veera, Nordentoft Merete, Mors Ole, Hougaard David M., Mortensen Preben Bo, Daly Mark J., Faraone Stephen V., Stefansson Hreinn, Roussos Panos, Franke Barbara, Werge Thomas, Neale Benjamin M.ORCID, Stefansson Kari, Børglum Anders D., ,
Abstract
AbstractAttention deficit hyperactivity disorder (ADHD) is a prevalent childhood psychiatric disorder, with a major genetic component. Here we present a GWAS meta-analysis of ADHD comprising 38,691 individuals with ADHD and 186,843 controls. We identified 27 genome-wide significant loci, which is more than twice the number previously reported. Fine-mapping risk loci highlighted 76 potential risk genes enriched in genes expressed in brain, particularly the frontal cortex, and in early brain development. Overall, ADHD was associated with several brain specific neuronal sub-types and especially midbrain dopaminergic neurons. In a subsample of 17,896 exome-sequenced individuals, we identified increased load of rare protein-truncating variants in cases for a set of risk genes enriched with likely causal common variants, suggesting implication of SORCS3 in ADHD by both common and rare variants. We found ADHD to be highly polygenic, with around seven thousand variants explaining 90% of the SNP heritability. Bivariate gaussian mixture modeling estimated that more than 90% of ADHD influencing variants are shared with other psychiatric disorders (autism, schizophrenia and depression) and phenotypes (e.g. educational attainment) when both concordant and discordant variants are considered. Additionally, we demonstrated that common variant ADHD risk was associated with impaired complex cognition such as verbal reasoning and a range of executive functions including attention.
Publisher
Cold Spring Harbor Laboratory
Cited by
14 articles.
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