Enrichment of rare protein truncating variants in amyotrophic lateral sclerosis patients
Sali M.K. Farhan,
Daniel P Howrigan,
Liam E. Abbott,
Andrea E Byrnes,
Bradley N. Smith,
Simon D. Topp,
Joseph R. Klim,
Daniel A. Mordes,
CReATe Consortium, FALS Consortium, ALSGENS Consortium,
Jacob L. McCauley,
J Paul Taylor,
Mike A Nalls,
Christopher E. Shaw,
David B. Goldstein,
Matthew B Harms,
Mark J. Daly,
Benjamin M. Neale
Posted 25 Apr 2018
bioRxiv DOI: 10.1101/307835 (published DOI: 10.1038/s41593-019-0530-0)
Posted 25 Apr 2018
To discover novel genetic risk factors underlying amyotrophic lateral sclerosis (ALS), we aggregated exomes from 3,864 cases and 7,839 ancestry matched controls. We observed a significant excess of ultra-rare and rare protein-truncating variants (PTV) among ALS cases, which was primarily concentrated in constrained genes; however, a significant enrichment in PTVs does persist in the remaining exome. Through gene level analyses, known ALS genes, SOD1, NEK1, and FUS, were the most strongly associated with disease status. We also observed suggestive statistical evidence for multiple novel genes including DNAJC7, which is a highly constrained gene and a member of the heat shock protein family (HSP40). HSP40 proteins, along with HSP70 proteins, facilitate protein homeostasis, such as folding of newly synthesized polypeptides, and clearance of degraded proteins. When these processes are not regulated, misfolding and accumulation of degraded proteins can occur leading to aberrant protein aggregation, one of the pathological hallmarks of neurodegeneration.
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