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Identification of CACNA1D variants associated with sinoatrial node dysfunction and deafness in additional Pakistani families reveals a clinical significance.

Abstract：

:Sinoatrial node dysfunction and deafness (SANDD) syndrome is rare and characterized by a low heart beat and severe-to-profound deafness. Additional features include fatigue, dizziness, and episodic syncope. The sinoatrial node (SAN) drives heart automaticity and continuously regulates heart rate. The CACNA1D gene encoding the Cav1.3 protein expressed in inner hair cells, atria and SAN, induces loss-of-function in channel activity and underlies SANDD. To date, only one variant c.1208_1209insGGG:p.(G403_V404insG) has been reported for SANDD syndrome. We studied five Pakistani families with SANDD and characterized a new missense variant p.(A376V) in CACNA1D in one family, and further characterized the founder variant p.(G403_V404insG) in four additional pedigrees. We show that affected individuals in the four families which segregate p.(G403_V404insG) share a 1.03 MB haplotype on 3p21.1 suggesting they share a common distant ancestor. In conclusion, we identified new and known variants in CACNA1D in five Pakistani families with SANDD. This study is of clinical importance as the CACNA1D founder variant is only observed in families from the Khyber Pakhtunkhwa (KPK) province, in Pakistan. Therefore, screening patients with congenital deafness for SAN dysfunction in this province could ensure adequate follow-up and prevent cardiac failure associated with SAN.

journal_name

J Hum Genet

journal_title

Journal of human genetics

authors

Liaqat K,Schrauwen I,Raza SI,Lee K,Hussain S,Chakchouk I,Nasir A,Acharya A,Abbe I,Umair M,Ansar M,Ullah I,Shah K,University of Washington Center for Mendelian Genomics.,Bamshad MJ,Nickerson DA,Ahmad W,Leal SM

doi

10.1038/s10038-018-0542-8

subject

Has Abstract

pub_date

2019-02-01 00:00:00

pages

153-160

issue

2

eissn

1434-5161

issn

1435-232X

pii

10.1038/s10038-018-0542-8

journal_volume

64

pub_type

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