Novel pathogenic SLC25A46 splice-site mutation causes an optic atrophy spectrum disorder

M. Nguyen, I. Boesten, D. M. E. I. Hellebrekers, N. M. Mulder-den Hartog, I. F. M. de Coo, H. J. M. Smeets, M. Gerards*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

25 Citations (Web of Science)

Abstract

The inherited optic neuropathies comprise a group of genetically heterogeneous disorders causing optic nerve dysfunction. In some cases, optic neuropathies are associated with cerebellar atrophy which mainly affects the vermis. Here, we describe a Moroccan girl of consanguineous parents with optic atrophy and cerebellar atrophy. Exome sequencing revealed a novel homozygous mutation (c.283+3G>T) in the donor splice site for exon 1 of SLC25A46. RNA analysis revealed that an alternative splice site within exon 1 was used leading to a premature termination codon within exon 2. SLC25A46 mRNA expression showed there is no wild-type transcript present in the patient and the mutant transcript does not undergo nonsense mediated mRNA decay. Futhermore, we observed c.283+3G>T SLC25A46 mutation induces mitochondrial fragmentation. An additional 10 patients with optic atrophy and cerebellar atrophy, which were negative for mtDNA and OPA1 variants, were tested for pathogenic mutations in the SLC25A46 gene. However, no additional variants were identified. Our findings confirm the recent report of pathogenic SLC25A46 mutations as a novel cause for optic atrophy spectrum disorder.

Original languageEnglish
Pages (from-to)121-125
Number of pages5
JournalClinical Genetics
Volume91
Issue number1
Early online date8 Apr 2016
DOIs
Publication statusPublished - Jan 2017

Keywords

  • optic atrophy
  • SLC25A46
  • cerebellar atrophy
  • exome sequencing
  • mitochondrial dynamics
  • CEREBELLAR-ATAXIA
  • FAMILY

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