[No authors listed]
The locus for autosomal recessive infantile cerebellar ataxia (CLA3 or SCAR6) has been mapped to chromosome 20q11-q13 in a single Norwegian pedigree. We identified a relatively uncharacterised mouse gene Tp53inp2, and showed that its human orthologue mapped within this candidate interval. Tp53inp2 appears to encode a mammalian-specific protein with homology to the two Tp53inp1 isoforms that respond to cellular stress and interact with p53. We show that Tp53inp2 expression is highly restricted during mouse embryogenesis, with strong expression in the developing brain and spinal cord, as well as in the sensory and motor neuron tracts of the peripheral nervous system. Given this expression pattern, the neurological phenotype of CLA3 and the chromosomal localisation of TP53INP2, we searched the coding region for mutations in samples from individuals from the CLA3 pedigree. Our failure to detect causative mutations suggests that alterations in the coding region of TP53INP2 are not responsible for ataxia in this family, although we cannot rule out changes in non-coding elements of this gene.
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