Human ataxias: a genetic dissection of inositol triphosphate receptor (ITPR1)-dependent signaling.
A persistent mystery about the ataxias has been why mutations in genes--many of which are expressed widely in the brain--primarily cause ataxia, and not, for example, epilepsy or dementia. Why should a polyglutamine stretch in the TATA-binding protein (that is important in all cells) particularly disrupt cerebellar coordination? We propose that advances in the genetics of cerebellar ataxias suggest a rational hypothesis for how so many different genes lead to predominantly cerebellar defects. We argue that the unifying feature of many genes involved in cerebellar ataxias is their impact on the signaling protein ITPR1 (inositiol 1,4,5-triphosphate receptor type 1), that underlies coincidence detection in Purkinje cells and could play an important role in cerebellar coordination.
Schorge
Stephanie
S
Reta Lila Weston Laboratories and Department of Molecular Neuroscience, Institute of Neurology, University College London, London, WC1N 3BG, UK.
van de Leemput
Joyce
J
Singleton
Andrew
A
Houlden
Henry
H
Hardy
John
J
D000818:Animals; D002118:Calcium / Q000378:metabolism; D020864:Calcium Channels, N-Type / Q000235:genetics; D002524:Cerebellar Ataxia / Q000235:genetics* / Q000473:pathology; D018698:Glutamic Acid / Q000378:metabolism; D006801:Humans; D053496:Inositol 1,4,5-Trisphosphate Receptors / Q000235:genetics*; D008954:Models, Biological; D009154:Mutation / Q000235:genetics; D010455:Peptides / Q000235:genetics; D015221:Potassium Channels / Q000235:genetics; D011689:Purkinje Cells / Q000378:metabolism; D015398:Signal Transduction / Q000235:genetics*
D020864:Calcium Channels, N-Type; D053496:Inositol 1,4,5-Trisphosphate Receptors; D010455:Peptides; D015221:Potassium Channels; C097188:polyglutamine; D018698:Glutamic Acid; D002118:Calcium