Clinical and Molecular Characterization of Ataxia with Oculomotor Apraxia Patients In Saudi Arabia

BMC Medical Genetics. 2011;12(1):27 DOI 10.1186/1471-2350-12-27

 

Journal Homepage

Journal Title: BMC Medical Genetics

ISSN: 1471-2350 (Online)

Publisher: BMC

LCC Subject Category: Medicine: Internal medicine | Science: Biology (General): Genetics

Country of publisher: United Kingdom

Language of fulltext: English

Full-text formats available: PDF, HTML

 

AUTHORS

Alkhairallah Thamer S
Khalil Dania S
Al Sharif Latifa J
Shinwari Jameela M
Bohlega Saeed A
Al Tassan Nada A

EDITORIAL INFORMATION

Open peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 22 weeks

 

Abstract | Full Text

<p>Abstract</p> <p>Background</p> <p>Autosomal recessive ataxias represent a group of clinically overlapping disorders. These include ataxia with oculomotor apraxia type1 (AOA1), ataxia with oculomotor apraxia type 2 (AOA2) and ataxia-telangiectasia-like disease (ATLD). Patients are mainly characterized by cerebellar ataxia and oculomotor apraxia. Although these forms are not quite distinctive phenotypically, different genes have been linked to these disorders. Mutations in the <it>APTX </it>gene were reported in AOA1 patients, mutations in <it>SETX </it>gene were reported in patients with AOA2 and mutations in <it>MRE11 </it>were identified in ATLD patients. In the present study we describe in detail the clinical features and results of genetic analysis of 9 patients from 4 Saudi families with ataxia and oculomotor apraxia.</p> <p>Methods</p> <p>This study was conducted in the period between 2005-2010 to clinically and molecularly characterize patients with AOA phenotype. Comprehensive sequencing of all coding exons of previously reported genes related to this disorder (<it>APTX</it>, <it>SETX </it>and <it>MRE11</it>).</p> <p>Results</p> <p>A novel nonsense truncating mutation c.6859 C > T, R2287X in <it>SETX </it>gene was identified in patients from one family with AOA2. The previously reported missense mutation W210C in <it>MRE11 </it>gene was identified in two families with autosomal recessive ataxia and oculomotor apraxia.</p> <p>Conclusion</p> <p>Mutations in <it>APTX </it>, <it>SETX </it>and <it>MRE11 </it>are common in patients with autosomal recessive ataxia and oculomotor apraxia. The results of the comprehensive screening of these genes in 4 Saudi families identified mutations in <it>SETX </it>and <it>MRE11 </it>genes but failed to identify mutations in <it>APTX </it>gene.</p>