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- Title
A novel mutation in PRPS1 causes X‐linked Charcot‐Marie‐Tooth disease‐5.
- Authors
Meng, Lingchao; Wang, Kang; Lv, He; Wang, Zhaoxia; Zhang, Wei; Yuan, Yun
- Abstract
X‐linked Charcot‐Marie‐Tooth disease‐5 (CMTX5) is a rare hereditary disorder caused by mutations in the gene for phosphoribosyl pyrophosphate synthetase‐1 (PRPS1). We investigated a boy with a novel PRPS1 mutation (c.334G>C, p.V112L) via genetic, neuropathological and enzymatic tests. The proband was a 13‐year‐old boy with congenital non‐syndromic sensorineural deafness. At 3 year old, he developed progressive distal weakness of all limbs with muscle atrophy of both hands and shanks. Nerve conduction study revealed the loss of sensory nerve action potentials, and slowing down of motor nerve conduction velocities with a decrease of amplitudes of compound motor action potentials. Visual evoked potentials and brainstem auditory evoked potentials were not bilaterally evocable. Sural biopsy proved the loss of myelinated nerve fibers, with axonal degeneration, regenerating clusters and onion bulbs. Enzymatically, PRPS1 activity was close to zero in the proband and mildly reduced in his mother, compared with controls. To our knowledge, this is the first report of CMTX5 in a Chinese population. The genetic finding has expanded the genotypic spectrum of PRPS1 mutations.
- Subjects
VISUAL evoked potentials; X chromosome; NEURAL conduction; AUDITORY evoked response; NERVE fibers
- Publication
Neuropathology, 2019, Vol 39, Issue 5, p342
- ISSN
0919-6544
- Publication type
Article
- DOI
10.1111/neup.12589