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Title: A novel mechanism for human cardiac Ankyrin-B syndrome due to reciprocal chromosomal translocation
Authors: Huq, Aamira J;Pertile, MD;Davis, AM;Landon, H;James, PA;Kline, CF;Vohra, J;Mohler, PJ;Delatycki, Martin B
Issue Date: Jun-2017
EDate: 2016-11-16
Citation: Heart, Lung and Circulation 2017; 26(6): 612-618
Abstract: 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.
DOI: 10.1016/j.hlc.2016.09.013
PubMed URL:
Type: Journal Article
Subjects: ANK2
Ankyrin-B syndrome
Cardiac arrhythmia
Chromosome 4 translocation
Long QT syndrome type 4
Appears in Collections:Journal articles

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