Mice homozygous for the dreher (dr) mutation are characterized by pigmentation and skeletal abnormalities and striking behavioral phenotypes, including ataxia, vestibular deficits, and hyperactivity. The ataxia is associated with a cerebellar malformation that is remarkably similar to human Dandy-Walker malformation. Previously, positional cloning identified mutations in LIM homeobox transcription factor 1 alpha gene (Lmx1a) in three dr alleles. Two of these alleles, however, are extinct and unavailable for further analysis. In this article we report a new spontaneous dr allele and describe the Lmx1a mutations in this and six additional dr alleles. Strikingly, deletion null, missense, and frameshift mutations in these alleles all cause similar cerebellar malformations, suggesting that all dr mutations analyzed to date are null alleles.
Mammalian Genome – Springer Journals
Published: Oct 3, 2006
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