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The Journal of Heredity 2002:93(2)
© 2002 The American Genetic Association 93:119-124

Structure, Chromosomal Location, and Analysis of the Canine Cu/Zn Superoxide Dismutase (SOD1) Gene

S. L. Green, R. J. Tolwani, S. Varma, P. Quignon, F. Galibert, and L. C. Cork

From the Department of Comparative Medicine, Stanford University School of Medicine, Stanford, CA 94305 (Green, Tolwani, Varma, and Cork), and the CNRS UMR6061 Facultáe de Máedecine, Universitáe de Rennes, 2 avenue du Professeur Láeon Bernard, F-35043 Rennes Cáedex, France (Quignon and Galibert).

Address correspondence to Sherril L. Green, Department of Comparative Medicine, Stanford University School of Medicine, RAF 1, Quad 7, Bldg. 330, Stanford, CA 94305, or e-mail: Sherril{at}leland.stanford.edu.

Mutations in Cu/Zn superoxide dismutase (SOD1), a major cytosolic antioxidant enzyme in eukaryotic cells, have been reported in approximately 20% of familial amyotrophic lateral sclerosis (FALS) patients. Hereditary canine spinal muscular atrophy (HCSMA), a fatal inherited motor neuron disease in Brittany spaniels, shares many clinical and pathological features with human motor neuron disease, including FALS. The SOD1 coding region has been sequenced and cloned from several animal species, but not from the dog. We have mapped the chromosomal location, sequenced, and characterized the canine SOD1 gene. Extending this analysis, we have evaluated SOD1 as a candidate for HCSMA. The 462 bp SOD1 coding region in the dog encodes 153 amino acid residues and exhibits more than 83% and 79% sequence identity to other mammalian homologues at both the nucleotide and amino acid levels, respectively. The canine SOD1 gene maps to CFA31 close to syntenic group 13 on the radiation hybrid (RH) map in the vicinity of sodium myo/inositol transporter (SMIT) gene. The human orthologous SOD1 and SMIT genes have been localized on HSA 21q22.1 and HSA 21q21, respectively, confirming the conservation of synteny between dog syntenic group 13 and HSA 21. Direct sequencing of SOD1 cDNA from six dogs with HCSMA revealed no mutations. Northern analysis indicated no differences in steady-state levels of SOD1 mRNA.


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