Congenital muscular dystrophy with fatty liver and infantile-onset cataract caused by TRAPPC11 mutations: broadening of the phenotype

Wen-Liang Chen, Wenhua Zhu, Satomi Mitsuhashi, Satoru Noguchi, Michael Sacher, Megumu Ogawa, Hsiang-Hung Shih, Yuh-Jyh Jong, Ichizo Nishino

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31 Scopus citations

Abstract

Background: Transport protein particle (TRAPP) is a multiprotein complex involved in endoplasmic reticulum-to-Golgi trafficking. Zebrafish with a mutation in the TRAPPC11 orthologue showed hepatomegaly with steatosis and defects in visual system development. In humans, TRAPPC11 mutations have been reported in only three families showing limb-girdle muscular dystrophy (LGMD) or myopathy with movement disorders and intellectual disability.

Methods: We screened muscular dystrophy genes using next-generation sequencing and performed associated molecular and biochemical analyses in a patient with fatty liver and cataract in addition to infantile-onset muscle weakness.

Results: We identified the first Asian patient with TRAPPC11 mutations. Muscle pathology demonstrated typical dystrophic changes and liver biopsy revealed steatosis. The patient carried compound heterozygous mutations of a previously reported missense and a novel splice-site mutation. The splice-site change produced two aberrantly-spliced transcripts that were both predicted to result in translational frameshift and truncated proteins. Full-length TRAPPC11 protein was undetectable on immunoblotting.

Conclusion: This report widens the phenotype of TRAPPC11-opathy as the patient showed the following: (1) congenital muscular dystrophy phenotype rather than LGMD; (2) steatosis and infantile-onset cataract, both not observed in previously reported patients; but (3) no ataxia or abnormal movement, clearly indicating that TRAPPC11 plays a physiological role in multiple tissues in human.
Original languageEnglish
Article number29
JournalScientific Reports
Volume5
DOIs
StatePublished - 28 Aug 2015

Keywords

  • Transport protein particle (TRAPP); Endoplasmic reticulum-to-Golgi trafficking; Steatosis; Cataract; Congenital muscular dystrophy
  • COMPONENTS; MUTANTS; DEFECTS; SCREEN

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