The nmd mouse mutation causes progressive degeneration of spinal motor neurons and muscle atrophy. We identified the mutated gene as the putative transcriptional activator and ATPase/DNA helicase previously described as Smbp2, Rip1, Gf1, or Catf1. Mutations were found in two alleles-a single amino acid deletion in nmdJ and a splice donor mutation in nmd2J. The selective vulnerability of motor neurons is striking in view of the widespread expression of this gene, although the pattern of degeneration may reflect a specific threshold since neither allele is null. In addition, the severity of the nmd phenotype is attenuated in a semidominant fashion by a major genetic locus on chromosome (Chr) 13. The identification of the nmd gene and mapping of a major suppressor provide new opportunities for understanding mechanisms of motor neuron degeneration.
SciCrunch® is a data sharing and display platform. Anyone can create a custom portal where they can select searchable subsets of hundreds of data sources, brand their web pages and create their community. SciCrunch® will push data updates automatically to all portals on a weekly basis. User communities can also add their own data to SciCrunch®, however this is not currently a free service.