SDHAF1, encoding a LYR complex-II specific assembly factor, is mutated in SDH-defective infantile leukoencephalopathy

Nat Genet. 2009 Jun;41(6):654-6. doi: 10.1038/ng.378. Epub 2009 May 24.


We report mutations in SDHAF1, encoding a new LYR-motif protein, in infantile leukoencephalopathy with defective succinate dehydrogenase (SDH, complex II). Disruption of the yeast homolog or expression of variants corresponding to human mutants caused SDH deficiency and failure of OXPHOS-dependent growth, whereas SDH activity and amount were restored in mutant fibroblasts proportionally with re-expression of the wild-type gene. SDHAF1 is the first bona fide SDH assembly factor reported in any organism.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Genetic Complementation Test
  • Humans
  • Infant
  • Iron-Sulfur Proteins / genetics
  • Leukoencephalopathies / enzymology
  • Leukoencephalopathies / genetics*
  • Mutation*
  • Protein Subunits / genetics
  • Proteins / genetics*
  • Sequence Deletion
  • Succinate Dehydrogenase / genetics*
  • Yeasts / enzymology
  • Yeasts / genetics


  • Iron-Sulfur Proteins
  • Protein Subunits
  • Proteins
  • SDHAF1 protein, human
  • Succinate Dehydrogenase