A novel AIFM1 mutation expands the phenotype to an infantile motor neuron disease

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AIFM1 is a gene located on the X chromosome, coding for AIF (Apoptosis-Inducing Factor), a mitochondrial flavoprotein involved in caspase-independent cell death. AIFM1 mutations have been associated with different clinical phenotypes: a severe infantile encephalopathy with combined oxidative phosphorylation deficiency and the Cowchock syndrome, an X-linked Charcot-Marie-Tooth disease (CMTX4) with axonal sensorimotor neuropathy, deafness and cognitive impairment. In two male cousins with early-onset mitochondrial encephalopathy and cytochrome c oxidase (COX) deficiency, we identified a novel AIFM1 mutation. Muscle biopsies and electromyography in both patients showed signs of severe denervation. Our patients manifested a phenotype that included signs of both cortical and motor neuron involvement. These observations emphasize the role of AIF in the development and function of neurons.

Original languageEnglish
Pages (from-to)463-466
Number of pages4
JournalEuropean Journal of Human Genetics
Issue number3
Publication statusPublished - Mar 1 2016


ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics

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