Missense mutation in the ATPase, aminophospholipid transporter protein ATP8A2 is associated with cerebellar atrophy and quadrupedal locomotion.

Cerebellar ataxia, mental retardation and dysequilibrium syndrome is a rare and heterogeneous condition. We investigated a consanguineous family from Turkey with four affected individuals exhibiting the condition. Homozygosity mapping revealed that several shared homozygous regions, including chromosome 13q12. Targeted next-generation sequencing of an affected individual followed by segregation analysis, population screening and prediction approaches revealed a novel missense variant, p.I376M, in ATP8A2. The mutation lies in a highly conserved C-terminal transmembrane region of E1 E2 ATPase domain. The ATP8A2 gene is mainly expressed in brain and development, in particular cerebellum. Interestingly, an unrelated individual has been identified, in whom mental retardation and severe hypotonia is associated with a de novo t(10;13) balanced translocation resulting with the disruption of ATP8A2. These findings suggest that ATP8A2 is involved in the development of the cerebro-cerebellar structures required for posture and gait in humans.
AuthorsOnur Emre Onat, Suleyman Gulsuner, Kaya Bilguvar, Ayse Nazli Basak, Haluk Topaloglu, Meliha Tan, Uner Tan, Murat Gunel, Tayfun Ozcelik
JournalEuropean journal of human genetics : EJHG (Eur J Hum Genet) Vol. 21 Issue 3 Pg. 281-5 (Mar 2013) ISSN: 1476-5438 [Electronic] England
PMID22892528 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
Chemical References
  • Phospholipid Transfer Proteins
  • Adenosine Triphosphatases
  • ATP8A2 protein, human
  • Adenosine Triphosphatases (genetics)
  • Amino Acid Sequence
  • Atrophy (genetics)
  • Base Sequence
  • Brain (physiology)
  • Cerebellar Ataxia (genetics)
  • Cerebellum (pathology)
  • Chromosomes, Human, Pair 13
  • Female
  • Gait (genetics)
  • Homozygote
  • Humans
  • Intellectual Disability (genetics)
  • Locomotion
  • Male
  • Molecular Sequence Data
  • Mutation, Missense
  • Pedigree
  • Phospholipid Transfer Proteins (genetics)

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