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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Genetic mapping and evaluation of candidate genes for spasmodic, a neurological mouse mutation with abnormal startle response.

Spasmodic (spd) is a recessive mouse mutation characterized by a prolonged righting reflex, fine motor tremor, leg clasping, and stiffness. Using an intersubspecific backcross that segregates spd, we placed spd on Chr 11 with the following gene order: Adra-1-3.8 +/- 2.1 cM-Pad-1- 6.3 +/- 2.7-(spd, Anx-6, Csfgm, Glr-1, Il-3, Il-4, Il-5, Sparc)-9.1 +/- 2.4-D11 Mit5-2.2 +/- 1.5-Asgr-1. This localization eliminated the alpha 1-adrenergic receptor ( Adra-1) and the alpha 1 and gamma 2 subunits of the GABAA receptor as candidate genes. Two other promising candidate genes, annexin VI (Anx-6) and a glutamate receptor (Glr-1), were mapped to within 2.1 cM of the spd locus. Although no recombination was observed between spd and Anx-6 or Glr-1, no evidence was obtained for a lesion in either gene. The presence of normal Anx-6 and Glr-1 mRNA transcripts was confirmed by Northern blot analysis, in situ hybridization, and DNA sequence analysis. The localization of Anx-6 and Glr-1 extends the known synteny homology between human chromosome 5q21-q31 and mouse Chr 11 and reveals the probable chromosomal location of the human counterpart to spd. Synteny homology and phenotypic similarities suggest that spasmodic mice may be a genetic model for the inherited human startle disease, hyperekplexia (STHE).[1]


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