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Hum Mutat. 2012 Feb;33(2):351-4. doi: 10.1002/humu.21650. Epub 2011 Dec 8.

A missense mutation in PIK3R5 gene in a family with ataxia and oculomotor apraxia.

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Department of Genetics, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.


Autosomal recessive ataxias are heterogeneous group of disorders characterized by cerebellar atrophy and peripheral sensorimotor neuropathy. Molecular characterization of this group of disorders identified a number of genes contributing to these overlapping phenotypes. Ataxia with oculomotor apraxia type 2 (AOA2) is an autosomal recessive form of ataxia caused by mutations in the SETX gene. We report on a consanguineous family with autosomal recessive inheritance and clinical characteristics of AOA2, and no mutations in the SETX gene. We mapped the AOA locus in this family to chromosome 17p12-p13. Sequencing of all genes in the refined region identified a homozygous missense mutation in PIK3R5 that was absent in 477 normal controls. Our characterization of the PIK3R5 protein and findings suggest that it may play a role in the development of the cerebellum and vermis.

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