A new neurological mouse mutation that arose spontaneously in a BALB/cByJ stock displays a semidominant pattern of inheritance. In the heterozygote, this mutation results in an early loss of Purkinje cells in the cerebellum, which is followed by the overt symptom of an ataxic gait first observed at postnatal day 13 (P13). A portion of animals homozygous for the mutation die within P0; the remaining homozygotes die by P25. The mutation maps to mouse Chromosome (Chr) 6 between markers D6Rck314 and D6Rck361, a chromosomal segment that contains the lurcher (Lc) locus. The Lc mutation is also semidominant and has a strikingly similar phenotype. A cross between a new mutant (Nm) heterozygote and an Lc heterozygote yields double heterozygotes, animals that carry both mutations, with a phenotype similar to that of both Nm and Lc homozygotes. The similarity in phenotype, the colocalization of the two loci on mouse Chr 6, and the positive result of the allelism test demonstrate that the new mutation is an allele of the Lc gene.
Mammalian Genome – Springer Journals
Published: Mar 31, 2009
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