Alanyl-tRNA Synthetase 2 (AARS2)-Related Ataxia Without Leukoencephalopathy

Molly E. Kuo, Anthony Antonellis, Vikram G. Shakkottai

Research output: Contribution to journalArticlepeer-review

Abstract

Mutations in the mitochondrial alanyl-tRNA synthetase gene, AARS2, have been reported to cause leukoencephalopathy associated with early ovarian failure, a clinical presentation described as “ovarioleukodystrophy.” We present a sibling pair: one with cerebellar ataxia and one with vision loss and cognitive impairment in addition to ataxia. Neither shows evidence of leukoencephalopathy on MRI imaging. Exome sequencing revealed that both siblings are compound heterozygous for AARS2 variants (p.Phe131del and p.Ile328Met). Yeast complementation assays indicate that p.Phe131del AARS2 dramatically impairs gene function and that p.Ile328Met AARS2 is a hypomorphic allele. This work expands the phenotypic spectrum of AARS2-associated disease to include ataxia without leukoencephalopathy.

Original languageEnglish (US)
Pages (from-to)154-160
Number of pages7
JournalCerebellum
Volume19
Issue number1
DOIs
StatePublished - Feb 1 2020
Externally publishedYes

Keywords

  • AARS2
  • Cerebellar ataxia
  • Leukoencephalopathy
  • Ovarioleukodystrophy
  • Recessive ataxia

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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