A newly recognized autosomal recessive syndrome affecting neurologic function and vision

Mustafa A. Salih, Andreas Tzschach, Darren T. Oystreck, Hamdy H. Hassan, Abdulmajeed Aldrees, Salah A. Elmalik, Heba Y. El Khashab, Thomas F. Wienker, Khaled K. Abu-Amero, Thomas M. Bosley

Research output: Contribution to journalArticlepeer-review


Genetic factors represent an important etiologic group in the causation of intellectual disability. We describe a Saudi Arabian family with closley related parents in which four of six children were affected by a congenital cognitive disturbance. The four individuals (aged 18, 16, 13, and 2 years when last examined) had motor and cognitive delay with seizures in early childhood, and three of the four (sparing only the youngest child) had progressive, severe cognitive decline with spasticity. Two affected children had ocular malformations, and the three older children had progressive visual loss. The youngest had normal globes with good functional vision when last examined but exhibited the oculodigital sign, which may signify a subclinical visual deficit. A potentially deleterious nucleotide change (c.1A>G; p.Met1Val) in the C12orf57 gene was homozygous in all affected individuals, heterozygous in the parents, and absent in an unaffected sibling and >350 normal individuals. This gene has no known function. This family manifests a autosomal recessive syndrome with some phenotypic variability that includes abnormal development of brain and eyes, delayed cognitive and motor milestones, seizures, and a severe cognitive and visual decline that is associated with a homozygous variant in a newly identified gene.

Original languageEnglish (US)
Pages (from-to)1207-1213
Number of pages7
JournalAmerican Journal of Medical Genetics, Part A
Issue number6
StatePublished - Jun 2013
Externally publishedYes


  • Brain malformation
  • C12orf57 gene
  • Chorioretinal coloboma
  • Corpus callosum
  • Epilepsy
  • Intellectual disability
  • Iris coloboma
  • Neurodegeneration
  • Neurogenetic disease
  • Staphyloma

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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