Long QT syndrome in chromosome 7q35q36.3 deletion involving KCNH2 gene: Warning for chlorpheniramine prescription.

Abstract:

BACKGROUND:The deletion of the distal 7q region is a rare chromosomal syndrome characterized by wide phenotypic manifestations including growth and psychomotor delay, facial dysmorphisms, and genitourinary malformations. METHODS:We describe a 6-year-old child with a 12-Mb deletion of the region 7q35q36.3. RESULTS:Among the deleted genes, two genes have cardiac implications: PRKAG2 (OMIM #602743), associated with hypertrophic cardiomyopathy, cardiac conduction disease, and sudden death, and KCNH2 (OMIM #152427), coding for a cardiac potassium channel involved in long QT syndrome, unmasked by the chlorpheniramine treatment. At same time, the SHH gene (OMIM #600725), encoding sonic hedgehog, a secreted protein that is involved in the embryonic development, is deleted. CONCLUSION:Our report underlines potential cardiac complications linked to the common pharmacological treatment in this rare multiorgan and proteiform disease.

journal_name

Mol Genet Genomic Med

authors

Di Stolfo G,Accadia M,Mastroianno S,Leone MP,Palumbo O,Palumbo P,Potenza D,Maccarone P,Sacco M,Russo A,Carella M

doi

10.1002/mgg3.855

subject

Has Abstract

pub_date

2019-09-01 00:00:00

pages

e855

issue

9

issn

2324-9269

journal_volume

7

pub_type

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