Mutation in ADAT3, encoding adenosine deaminase acting on transfer RNA, causes intellectual disability and strabismus.

Abstract:

BACKGROUND:Intellectual disability (ID) is one of the most common forms of disability worldwide, displaying a wide range of aetiologies and affecting nearly 2% of the global population. OBJECTIVE:To describe a novel autosomal recessive form of ID with strabismus and its underlying aetiology. MATERIALS AND METHODS:Autozygosity mapping, linkage analysis and exome sequencing were performed in a large multiplex consanguineous family that segregates ID and strabismus. Exome sequencing was independently performed in three other consanguineous families segregating the same disease. Direct sequencing of the resulting candidate gene was performed in four additional families with the same phenotype. RESULTS:A single missense mutation was identified in ADAT3 in all studied families on an ancient ancestral haplotype. This gene encodes one of two eukaryotic proteins that are necessary for the deamination of adenosine at position 34 to inosine in t-RNA. Our results show the first human mutation in the t-RNA editing machinery and expand the landscape of pathways involved in the pathogenesis of ID.

journal_name

J Med Genet

authors

Alazami AM,Hijazi H,Al-Dosari MS,Shaheen R,Hashem A,Aldahmesh MA,Mohamed JY,Kentab A,Salih MA,Awaji A,Masoodi TA,Alkuraya FS

doi

10.1136/jmedgenet-2012-101378

subject

Has Abstract

pub_date

2013-07-01 00:00:00

pages

425-30

issue

7

eissn

0022-2593

issn

1468-6244

pii

jmedgenet-2012-101378

journal_volume

50

pub_type

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