Wolff-Parkinson-White syndrome: De novo variants and evidence for mutational burden in genes associated with atrial fibrillation

Am J Med Genet A. 2020 Jun;182(6):1387-1399. doi: 10.1002/ajmg.a.61571. Epub 2020 Mar 31.

Abstract

Background: Wolff-Parkinson-White (WPW) syndrome is a relatively common arrhythmia affecting ~1-3/1,000 individuals. Mutations in PRKAG2 have been described in rare patients in association with cardiomyopathy. However, the genetic basis of WPW in individuals with a structurally normal heart remains poorly understood. Sudden death due to atrial fibrillation (AF) can also occur in these individuals. Several studies have indicated that despite ablation of an accessory pathway, the risk of AF remains high in patients compared to general population.

Methods: We applied exome sequencing in 305 subjects, including 65 trios, 80 singletons, and 6 multiple affected families. We used de novo analysis, candidate gene approach, and burden testing to explore the genetic contributions to WPW.

Results: A heterozygous deleterious variant in PRKAG2 was identified in one subject, accounting for 0.6% (1/151) of the genetic basis of WPW in this study. Another individual with WPW and left ventricular hypertrophy carried a known pathogenic variant in MYH7. We found rare de novo variants in genes associated with arrhythmia and cardiomyopathy (ANK2, NEBL, PITX2, and PRDM16) in this cohort. There was an increased burden of rare deleterious variants (MAF ≤ 0.005) with CADD score ≥ 25 in genes linked to AF in cases compared to controls (P = .0023).

Conclusions: Our findings show an increased burden of rare deleterious variants in genes linked to AF in WPW syndrome, suggesting that genetic factors that determine the development of accessory pathways may be linked to an increased susceptibility of atrial muscle to AF in a subset of patients.

Keywords: ANK2; Wolff-Parkinson-White (WPW) syndrome; atrial fibrillation; exome sequencing.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • AMP-Activated Protein Kinases / genetics*
  • Adolescent
  • Adult
  • Ankyrins / genetics
  • Atrial Fibrillation / genetics*
  • Atrial Fibrillation / pathology
  • Carrier Proteins / genetics
  • Child
  • Cohort Studies
  • Cytoskeletal Proteins / genetics
  • DNA-Binding Proteins / genetics
  • Female
  • Genetic Association Studies
  • Genetic Predisposition to Disease*
  • Heart Atria / pathology
  • Homeodomain Proteins / genetics
  • Humans
  • LIM Domain Proteins / genetics
  • Male
  • Mutation / genetics
  • Transcription Factors / genetics
  • Whole Exome Sequencing
  • Wolff-Parkinson-White Syndrome / genetics*
  • Wolff-Parkinson-White Syndrome / pathology
  • Young Adult

Substances

  • ANK2 protein, human
  • Ankyrins
  • Carrier Proteins
  • Cytoskeletal Proteins
  • DNA-Binding Proteins
  • Homeodomain Proteins
  • LIM Domain Proteins
  • NEBL protein, human
  • PRDM16 protein, human
  • Transcription Factors
  • homeobox protein PITX2
  • PRKAG2 protein, human
  • AMP-Activated Protein Kinases