A Homozygous Deletion in GRID2 Causes a Human Phenotype With Cerebellar Ataxia and Atrophy

Creative Commons License

Ütine G. E., Haliloglu G., Volkan Salancı B., Çetinkaya A., Şimşek Kiper P. Ö., Alanay Y., ...More

JOURNAL OF CHILD NEUROLOGY, vol.28, no.7, pp.926-932, 2013 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 28 Issue: 7
  • Publication Date: 2013
  • Doi Number: 10.1177/0883073813484967
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.926-932
  • Keywords: intellectual disability, cerebellar ataxia, GRID2, homozygous, deletion, glutamate, excitatory neurotransmitter, DELTA-2 GLUTAMATE-RECEPTOR, MOTOR COORDINATION, HOTFOOT, GENE, MUTATIONS, LURCHER, GLUTAMATE-RECEPTOR-DELTA-2, MICE
  • Hacettepe University Affiliated: Yes


GRID2 is a member of the ionotropic glutamate receptor family of excitatory neurotransmitter receptors. GRID2 encodes the glutamate receptor subunit delta-2, selectively expressed in cerebellar Purkinje cells. The phenotype associated with loss of GRID2 function was described only in mice until now, characterized by different degrees of cerebellar ataxia and usually relatively mild abnormalities of the cerebellum. This work describes for the first time the human phenotype associated with homozygous partial deletion of GRID2 in 3 children in one large consanguineous Turkish family. Homozygous deletion of exons 3 and 4 of GRID2 (94153589-94298037bp) in the proband and similarly affected cousins, and heterozygous deletions in parental DNA were shown using Affymetrix (R) 6.0 single-nucleotide polymorphism array, confirmed by real-time polymerase chain reaction. The phenotype includes nystagmus, hypotonia with marked developmental delay in gross motor skills in early infancy followed by a static encephalopathy course with development of cerebellar ataxia, oculomotor apraxia, and pyramidal tract involvement.