Sporadic centronuclear myopathy with muscle pseudohypertrophy, neutropenia, and necklace fibers due to a DNM2 mutation.

ABSTRACT: Dynamin 2 gene (DNM2) mutations result in an autosomal dominant centronuclear myopathy (CNM) and a Charcot-Marie-Tooth (CMT) neuropathy. DNM2-CMT but not DNM2-CNM patients were noted to have neutropenia. We here report a man with paravertebral muscles hypertrophy and mild neutropenia. His muscle biopsy was typical for CNM with additional "necklace" fibers. Sequencing of DNM2 revealed a known heterozygous c.1269C>T (p.Arg369Trp) mutation. Necklace fibers were considered as a pathological hallmark of late onset X-linked CNM due to mutations in MTM1 but have not been observed in DNM2-CNM. The findings broaden the features of DNM2-myopathy.

SUBMITTER: Liewluck T 

PROVIDER: S-EPMC2991611 | biostudies-literature | 2010 Dec

REPOSITORIES: biostudies-literature