ITPR1 and cerebellar ataxia: The quantitative PCR technique was used to survey large segmental deletion of ITPR1 and a targeted sequencing approach was applied to sequence all of the 61 exons and the flanking regions of ITPR1. A novel ITPR1 mutation, c.7721T>C (p.V2574A), was identified in a family with dominantly inherited cerebellar ataxia.