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Title: Analysis of shared heritability in common disorders of the brain
Author: Anttila, Verneri
Bulik-Sullivan, Brendan
Finucane, Hilary K.
Walters, Raymond K.
Bras, Jose
Duncan, Laramie
Escott-Price, Valentina
Falcone, Guido J.
Gormley, Padhraig
Malik, Rainer
Patsopoulos, Nikolaos A.
Ripke, Stephan
Walters, James
Wei, Zhi
Yu, Dongmei
Lee, Phil H.
Turley, Patrick
IGAP consortium
IHGC consortium
ILAE Consortium on Complex Epilepsies
IMSGC consortium
IPDGC consortium
Intracerebral Hemorrhage Studies of the International Stroke Genetics Consortium [...] Rabionet R [...]
Attention-Deficit Hyperactivity Disorder Working Group of the Psychiatric Genomics Consortium
Anorexia Nervosa Working Group of the Psychiatric Genomics Consortium
Autism Spectrum Disorders Working Group of The Psychiatric Genomics Consortium
Bipolar Disorders Working Group of the Psychiatric Genomics Consortium
Major Depressive Disorder Working Group of the Psychiatric Genomics Consortium
Tourette Syndrome
Obsessive Compulsive Disorder
Tourette Syndrome Working Group of the Psychiatric Genomics Consortium
Schizophrenia Working Group of the Psychiatric Genomics Consortium
Breen, Gerome
Churchhouse, Claire
Bulik, Cynthia M.
Daly, Mark
Dichgans, Martin
Cormand Rifà, Bru
Rabionet Janssen, Raquel
Keywords: Malalties cerebrals
Brain diseases
Issue Date: 22-Jun-2018
Publisher: American Association for the Advancement of Science
Abstract: ience, this issue p. eaap8757 Structured Abstract INTRODUCTION Brain disorders may exhibit shared symptoms and substantial epidemiological comorbidity, inciting debate about their etiologic overlap. However, detailed study of phenotypes with different ages of onset, severity, and presentation poses a considerable challenge. Recently developed heritability methods allow us to accurately measure correlation of genome-wide common variant risk between two phenotypes from pools of different individuals and assess how connected they, or at least their genetic risks, are on the genomic level. We used genome-wide association data for 265,218 patients and 784,643 control participants, as well as 17 phenotypes from a total of 1,191,588 individuals, to quantify the degree of overlap for genetic risk factors of 25 common brain disorders. RATIONALE Over the past century, the classification of brain disorders has evolved to reflect the medical and scientific communities' assessments of the presumed root causes of clinical phenomena such as behavioral change, loss of motor function, or alterations of consciousness. Directly observable phenomena (such as the presence of emboli, protein tangles, or unusual electrical activity patterns) generally define and separate neurological disorders from psychiatric disorders. Understanding the genetic underpinnings and categorical distinctions for brain disorders and related phenotypes may inform the search for their biological mechanisms. RESULTS Common variant risk for psychiatric disorders was shown to correlate significantly, especially among attention deficit hyperactivity disorder (ADHD), bipolar disorder, major depressive disorder (MDD), and schizophrenia. By contrast, neurological disorders appear more distinct from one another and from the psychiatric disorders, except for migraine, which was significantly correlated to ADHD, MDD, and Tourette syndrome. We demonstrate that, in the general population, the personality trait neuroticism is significantly correlated with almost every psychiatric disorder and migraine. We also identify significant genetic sharing between disorders and early life cognitive measures (e.g., years of education and college attainment) in the general population, demonstrating positive correlation with several psychiatric disorders (e.g., anorexia nervosa and bipolar disorder) and negative correlation with several neurological phenotypes (e.g., Alzheimer's disease and ischemic stroke), even though the latter are considered to result from specific processes that occur later in life. Extensive simulations were also performed to inform how statistical power, diagnostic misclassification, and phenotypic heterogeneity influence genetic correlations. CONCLUSION The high degree of genetic correlation among many of the psychiatric disorders adds further evidence that their current clinical boundaries do not reflect distinct underlying pathogenic processes, at least on the genetic level. This suggests a deeply interconnected nature for psychiatric disorders, in contrast to neurological disorders, and underscores the need to refine psychiatric diagnostics. Genetically informed analyses may provide important "scaffolding" to support such restructuring of psychiatric nosology, which likely requires incorporating many levels of information. By contrast, we find limited evidence for widespread common genetic risk sharing among neurological disorders or across neurological and psychiatric disorders. We show that both psychiatric and neurological disorders have robust correlations with cognitive and personality measures. Further study is needed to evaluate whether overlapping genetic contributions to psychiatric pathology may influence treatment choices. Ultimately, such developments may pave the way toward reduced heterogeneity and improved diagnosis and treatment of psychiatric disorders.
Note: Versió postprint del document publicat a:
It is part of: Science, 2018, vol. 360, num. 6395
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ISSN: 0036-8075
Appears in Collections:Articles publicats en revistes (Genètica, Microbiologia i Estadística)

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