Two cases of recessive intellectual disability caused by NDST1 and METTL23 variants

Intellectual disability (ID) is a highly heterogeneous genetic condition with more than a thousand genes described so far. By exome sequencing of two consanguineous families presenting hallmark features of ID, we identified two homozygous variants in two genes previously associated with autosomal re...

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Main Authors: Khan, Amjad (Author) , Miao, Zhichao (Author) , Umair, Muhammad (Author) , Ullah, Amir (Author) , Alshabeeb, Mohammad A. (Author) , Bilal, Muhammad (Author) , Ahmad, Farooq (Author) , Rappold, Gudrun (Author) , Ansar, Muhammad (Author) , Carapito, Raphael (Author)
Format: Article (Journal)
Language:English
Published: 31 August 2020
In: Genes
Year: 2020, Volume: 11, Issue: 9
ISSN:2073-4425
DOI:10.3390/genes11091021
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3390/genes11091021
Verlag, lizenzpflichtig, Volltext: https://www.mdpi.com/2073-4425/11/9/1021
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Author Notes:Amjad Khan, Zhichao Miao, Muhammad Umair, Amir Ullah, Mohammad A. Alshabeeb, Muhammad Bilal, Farooq Ahmad, Gudrun A. Rappold, Muhammad Ansar and Raphael Carapito

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520 |a Intellectual disability (ID) is a highly heterogeneous genetic condition with more than a thousand genes described so far. By exome sequencing of two consanguineous families presenting hallmark features of ID, we identified two homozygous variants in two genes previously associated with autosomal recessive ID: NDST1 (c.1966G>A; p.Asp656Asn) and METTL23 (c.310T>C; p.Phe104Leu). The segregation of the variants was validated by Sanger sequencing in all family members. In silico homology modeling of wild-type and mutated proteins revealed substantial changes in the secondary structure of both proteins, indicating a possible effect on function. The identification and validation of new pathogenic NDST1 and METTL23 variants in two cases of autosomal recessive ID further highlight the importance of these genes in proper brain function and development. 
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