A Novel Mechanism for Human Cardiac Ankyrin-B Syndrome due to Reciprocal Chromosomal Translocation

A. J. Huq, M.D. Pertile, A. M. Davis, H. Landon, P. A. James, C. F. Kline, J. Vohra, P. J. Mohler, M.B. Delatycki

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Background Cardiac rhythm abnormalities are a leading cause of morbidity and mortality in developed countries. Loss-of-function variants in the ANK2 gene can cause a variety of cardiac rhythm abnormalities including sinus node dysfunction, atrial fibrillation and ventricular arrhythmias (called the “ankyrin-B syndrome”). ANK2 encodes ankyrin-B, a molecule critical for the membrane targeting of key cardiac ion channels, transporters, and signalling proteins. Methods and Results Here, we describe a family with a reciprocal chromosomal translocation between chromosomes 4q25 and 9q26 that transects the ANK2 gene on chromosome 4 resulting in loss-of-function of ankyrin-B. Select family members with ankyrin-B haploinsufficiency due to the translocation displayed clinical features of ankyrin-B syndrome. Furthermore, evaluation of primary lymphoblasts from a carrier of the translocation showed altered levels of ankyrin-B as well as a reduced expression of downstream ankyrin-binding partners. Conclusions Thus, our data conclude that, similar to previously described ANK2 loss-of-function “point mutations”, large chromosomal translocations resulting in ANK2 haploinsufficiency are sufficient to cause the human cardiac ankyrin-B syndrome. The unexpected ascertainment of ANK2 dysfunction via the discovery of a chromosomal translocation in this family, the determination of the familial phenotype, as well as the complexities in formulating screening and treatment strategies are discussed.

Original languageEnglish
Pages (from-to)612-618
Number of pages7
JournalHeart Lung and Circulation
Issue number6
Publication statusPublished - 1 Jun 2017
Externally publishedYes


  • ANK2
  • Ankyrin-B
  • Ankyrin-B syndrome
  • Cardiac arrhythmia
  • Chromosome 4 translocation
  • Long QT syndrome type 4

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