Exome sequencing revealed PMM2 gene mutations in a French-Canadian family with congenital atrophy of the cerebellum.

Abstract

Two affected and one unaffected siblings from a French-Canadian family were evaluated in our neurogenetic clinic. The oldest brother had intentional and postural hand tremor while his youngest sister presented mild ataxia, a similar hand tremor and global developmental delay. Brain MRIs of the two affected family members further revealed a significant cerebellar atrophy. For this study we conducted a whole exome sequencing (WES) investigation using genomic DNA prepared from the affected brother and sister, alongside DNA prepared from their unaffected mother, and identified two mutations previously reported to cause a rare disorder known as Congenital Disorder of Glycosylation, type Ia (CDG1A) (OMIM #212065). This study emphasizes how the diagnosis of patients presenting a mild tremor phenotype associated with cerebellar atrophy may benefit from WES in establishing genetic defects associated with their conditions.

• Authors: Anne Noreau, Philippe Beauchemin, Alexandre Dionne-Laporte, FORGE Canada, Patrick A Dion, Guy A Rouleau, Nicolas Dupré
• Journal: Cerebellum & ataxias (Cerebellum Ataxias) Vol. 1 Pg. 8 ( 2014) ISSN: 2053-8871 [Print] England
• PMID: 26331032 (Publication Type: Case Reports)