Abstract 9929: Novel Mutations Identified by Whole Exome Sequencing in Families With Congenital Heart Disease
Congenital heart disease (CHD) is a complex disorder with multifactorial etiology and high heritability. We used whole exome sequencing to identify novel variants associated with familial CHD.
Methods: CHD patients were enrolled in a prospective biobank registry (n=2800). Whole exome sequencing was performed in 12 affected members with LV outflow tract defects and 7 non-affected members from 5 families using Illumina Hi-Seq 2000, and Agilent SureSelect Human All Exon v.2 Kit for sequence capture.
Results: Sequence alignment to the reference human genome (GRCh37/hg19) identified over 48K single nucleotide variants (SNVs) and indels (average 820 novel coding variants per individual). SNVs were called using SOAP tools and SIFT, Polyphen and Mutation Taster algorithms were used to predict pathogenicity. Affected and unaffected members were compared using the dominant model to identify novel CHD-associated variants. We identified 216 novel SNVs that segregated within affected members (not seen in unaffected members). These included 82 potentially pathogenic variants on 69 genes expressed in the heart and/or vasculature. Of these, 51 were inherited and 31 were de novo. Novel inherited variants in two genes on the Eph (ephrin) family receptor interacting proteins segregated within 4 affected members from 2 families. Eph receptors form the largest subfamily of receptor tyrosine kinases that are components of cell adhesion, migration, and signalling pathways and are involved in organ development. Additional inherited and de novo variants are being further characterized to determine if they are related to cardiac developmental pathways.
Conclusions: Next-generation sequencing can detect novel variants on susceptibility genes that identify new pathways involved in CHD causation. Replication in additional CHD families and candidate gene resequencing will help validate the association of observed variants with CHD.
- © 2012 by American Heart Association, Inc.