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Hum Mol Genet. 2015 Aug 15;24(16):4764-73. doi: 10.1093/hmg/ddv196. Epub 2015 Jun 1.

Increased burden of de novo predicted deleterious variants in complex congenital diaphragmatic hernia.

Author information

1
Division of Molecular Genetics, Department of Pediatrics.
2
The Herbert Irving Comprehensive Cancer Center.
3
Department of Surgery.
4
California Pediatric Surgery Group, Santa Barbara, CA 93105, USA.
5
Division of Pediatric Surgery, Tel Hashomer Medical Center, Tel Hashomer, Israel.
6
Department of Pediatric Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA.
7
Pediatric Surgery Division, Department of Surgery, Oregon Health Science University, Portland, OR 97239, USA and.
8
Section of Pediatric Surgery, Department of Surgery, University of Michigan Health System, Ann Arbor, MI 48109, USA.
9
Departments of System Biology and Biomedical Informatics, Columbia University Medical Center, New York, NY 10032, USA, ys2411@columbia.edu wkc15@cumc.columbia.edu.
10
Division of Molecular Genetics, Department of Pediatrics, ys2411@columbia.edu wkc15@cumc.columbia.edu.

Abstract

Congenital diaphragmatic hernia (CDH) is a serious birth defect that accounts for 8% of all major birth anomalies. Approximately 40% of cases occur in association with other anomalies. As sporadic complex CDH likely has a significant impact on reproductive fitness, we hypothesized that de novo variants would account for the etiology in a significant fraction of cases. We performed exome sequencing in 39 CDH trios and compared the frequency of de novo variants with 787 unaffected controls from the Simons Simplex Collection. We found no significant difference in overall frequency of de novo variants between cases and controls. However, among genes that are highly expressed during diaphragm development, there was a significant burden of likely gene disrupting (LGD) and predicted deleterious missense variants in cases (fold enrichment = 3.2, P-value = 0.003), and these genes are more likely to be haploinsufficient (P-value = 0.01) than the ones with benign missense or synonymous de novo variants in cases. After accounting for the frequency of de novo variants in the control population, we estimate that 15% of sporadic complex CDH patients are attributable to de novo LGD or deleterious missense variants. We identified several genes with predicted deleterious de novo variants that fall into common categories of genes related to transcription factors and cell migration that we believe are related to the pathogenesis of CDH. These data provide supportive evidence for novel genes in the pathogenesis of CDH associated with other anomalies and suggest that de novo variants play a significant role in complex CDH cases.

PMID:
26034137
PMCID:
PMC4512631
DOI:
10.1093/hmg/ddv196
[Indexed for MEDLINE]
Free PMC Article

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