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The identification of two pathogenic variants in a family with mild and severe forms of developmental delay.

Abstract：

:Intellectual disability (ID) accounts for 1% of the general population, and it is caused by the interplay between the genetic and/or environmental factors. The genetic components responsible for the development of ID are highly heterogeneous, and the phenotype and severity of the disease vary in patients even if they have an identical pathological variant and/or belong to the same family. Herein, we reported two male siblings with ID in an Iranian family. By means of the whole-exome sequencing method, elder brother affected by a moderate form of ID exhibited a de novo missense variant in the KCNQ3 gene, while another sibling afflicted with a severe form of the disease exhibited a de novo in-frame deletion in the UBE3A gene. Both variants have been previously ascribed to similar clinical phenotypes. In addition, a genetic variant in the KCNQ3 gene was transmitted to his son, who had a mild form of ID. To our knowledge, all individuals with KCNQ3-related developmental delay show de novo variants in the KCNQ3 gene. Thus, this familial case exhibit milder phenotype that might extend the clinical spectrum of KCNQ3 pathogenic variants. In addition, the current report highlights the significance of the clinical evaluation and non-biased assessment of the genetic analysis.

journal_name

J Hum Genet

journal_title

Journal of human genetics

authors

Miyake N,Heydari S,Garshasbi M,Saitoh S,Nasiri J,Hamanaka K,Takata A,Matsumoto N,Beheshti FH,Chaleshtori ARS

doi

10.1038/s10038-020-0809-8

subject

Has Abstract

pub_date

2020-10-09 00:00:00

eissn

1434-5161

issn

1435-232X

pii

10.1038/s10038-020-0809-8

pub_type

杂志文章

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