Exome-wide assessment of isolated biliary atresia: A report from the National Birth Defects Prevention Study using child-parent trios and a case-control design to identify novel rare variants.

Abstract

The etiology of biliary atresia (BA) is unknown, but recent studies suggest a role for rare protein-altering variants (PAVs). Exome sequencing data from the National Birth Defects Prevention Study on 54 child-parent trios, one child-mother duo, and 1513 parents of children with other birth defects were analyzed. Most (91%) cases were isolated BA. We performed (1) a trio-based analysis to identify rare de novo, homozygous, and compound heterozygous PAVs and (2) a case-control analysis using a sequence kernel-based association test to identify genes enriched with rare PAVs. While we replicated previous findings on PKD1L1, our results do not suggest that recurrent de novo PAVs play important roles in BA susceptibility. In fact, our finding in NOTCH2, a disease gene associated with Alagille syndrome, highlights the difficulty in BA diagnosis. Notably, IFRD2 has been implicated in other gastrointestinal conditions and warrants additional study. Overall, our findings strengthen the hypothesis that the etiology of BA is complex.

• Authors: Pagna Sok, Aniko Sabo, Lynn M Almli, Mary M Jenkins, Wendy N Nembhard, A J Agopian, Michael J Bamshad, Elizabeth E Blue, Lawrence C Brody, Austin L Brown, Marilyn L Browne, Mark A Canfield, Suzan L Carmichael, Jessica X Chong, Shannon Dugan-Perez, Marcia L Feldkamp, Richard H Finnell, Richard A Gibbs, Denise M Kay, Yunping Lei, Qingchang Meng, Cynthia A Moore, James C Mullikin, Donna Muzny, Andrew F Olshan, Faith Pangilinan, Jennita Reefhuis, Paul A Romitti, Jeremy M Schraw, Gary M Shaw, Martha M Werler, Sanjiv Harpavat, Philip J Lupo, University of Washington Center for Mendelian Genomics, NISC Comparative Sequencing Program, the National Birth Defects Prevention Study
• Journal: American journal of medical genetics. Part A (Am J Med Genet A) Vol. 191 Issue 6 Pg. 1546-1556 (06 2023) ISSN: 1552-4833 [Electronic] United States
• PMID: 36942736 (Publication Type: Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, N.I.H., Extramural)
• Copyright: © 2023 Wiley Periodicals LLC.

Chemical References

• PKD1L1 protein, human
• Membrane Proteins

Topics

• Humans
• Biliary Atresia (epidemiology, genetics, diagnosis)
• Exome (genetics)
• Homozygote
• Parents
• Case-Control Studies
• Membrane Proteins (genetics)