Conditional GWAS analysis identifies putative disorder-specific SNPs for psychiatric disorders
Enda M. Byrne,
Nathan G. Skene,
Antonio F Pardinas,
Jordan W. Smoller,
Bipolar Working Group of the Psychiatric Genomics Consortium,
Major Depressive Disorder Working Group of the Psychiatric Genomics Consortium,
Michael J Owen,
James TR Walters,
Michael C O’Donovan,
John G McGrath,
Patrick F Sullivan,
Michael E Goddard,
Peter M Visscher,
Naomi R. Wray
Posted 30 Mar 2019
bioRxiv DOI: 10.1101/592899
Posted 30 Mar 2019
Substantial genetic liability is shared across psychiatric disorders but less is known about risk variants that are specific to a given disorder. We used multi-trait conditional and joint analysis (mtCOJO) to adjust GWAS summary statistics of one disorder for the effects of genetically correlated traits to identify putative disorder-specific SNP associations. We applied mtCOJO to summary statistics for five psychiatric disorders from the Psychiatric Genomics Consortium – schizophrenia (SCZ), bipolar disorder (BIP), major depression (MD), attention-deficit hyperactivity disorder (ADHD) and autism (AUT). Most genom-wide significant variants for these disorders had evidence of pleiotropy (i.e., impact on multiple psychiatric disorders) and hence have reduced mtCOJO conditional effect sizes. However, subsets of genome-wide significant variants had larger conditional effect sizes consistent with disorder-specific effects: 15 of 130 genome-wide significant variants for schizophrenia, 5 of 40 for major depression, 3 of 11 for ADHD and 1 of 2 for autism. In addition, we identified a number of variants that approached genome-wide significance in the original GWAS and have larger conditional effect sizes after conditioning on the other disorders. We show that decreased expression of VPS29 in the brain may increase risk to SCZ only and increased expression of CSE1L is associated with SCZ and MD, but not with BIP. Likewise, decreased expression of PCDHA7 in the brain is linked to increased risk of MD but decreased risk of SCZ and BIP.
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