Homozygosity for a nonsense variant in AIMP2 is associated with a progressive neurodevelopmental disorder with microcephaly, seizures, and spastic quadriparesis

J Hum Genet. 2018 Jan;63(1):19-25. doi: 10.1038/s10038-017-0363-1. Epub 2017 Nov 16.


We ascertained two unrelated consanguineous families with two affected children each having microcephaly, refractory seizures, intellectual disability, and spastic quadriparesis. Magnetic resonance imaging showed atrophy of cerebrum, cerebellum and spinal cord, prominent cisterna magna, symmetric T2 hypo-intensities in the bilateral basal ganglia and thinning of corpus callosum. Whole-exome sequencing of three affected individuals revealed c.105C>A [p.(Tyr35Ter)] variant in AIMP2. The variant lies in a common homozygous region of 940 kb on chromosome 7 and is likely to have been inherited from a common ancestor. The phenotype noted in our subjects' shares marked similarity with that of hypomyelinating leukodystrophy-3 caused by mutations in closely related gene AIMP1. We hereby report the first human disease associated with deleterious mutations in AIMP2.

Publication types

  • Case Reports

MeSH terms

  • Child
  • Chromosomes, Human, Pair 7 / genetics
  • Codon, Nonsense*
  • Exome
  • Female
  • Genetic Diseases, Inborn / genetics*
  • Genetic Diseases, Inborn / pathology
  • Homozygote*
  • Humans
  • Microcephaly / genetics*
  • Microcephaly / pathology
  • Neurodevelopmental Disorders / genetics*
  • Neurodevelopmental Disorders / pathology
  • Nuclear Proteins / genetics*
  • Quadriplegia / genetics*
  • Quadriplegia / pathology
  • Seizures / genetics*
  • Seizures / pathology


  • AIMP2 protein, human
  • Codon, Nonsense
  • Nuclear Proteins