title: Genetic analysis of liver neuraminidase isozymes in Rattus norvegicus: independent control of NEU-1 and NEU-2 phenotypes.
abstract: Two recently identified isozymes of neuraminidase in rat liver were examined for transmission patterns and linkage relationships, and for variation among inbred strains. The isozymes, designated neuraminidase-1 (NEU-1) and neuraminidase-2 (NEU-2), exhibited no electrophoretic mobility variants among the 22 inbred strains examined, but did possess striking interstrain variation in activity phenotypes on electrophoretic gels. The results of a backcross analysis involving the KGH and ACP strains revealed that NEU-1 and NEU-2 phenotypes are independently controlled, each by a single autosomal locus with additively acting alleles. The two loci are unlinked to one another, but the gene controlling NEU-1 is tightly linked to RT1, the rat major histocompatibility complex. This gene is almost certainly identical to Neu-1, a gene identified previously through its effect on "total" activity levels of liver neuraminidase as determined by fluorometric assay of tissue homogenates. NEU-2 and the gene controlling its phenotype were not detected by the fluorometric technique. We designate the genes controlling the NEU-1 and NEU-2 phenotypes as Neu-1 and Neu-2, respectively. Data from this and other studies place Neu-1 between Glo-1 and dw-3. The location of Neu-2 is unknown.
mesh_terms: D000818:Animals; D003433:Crosses, Genetic; D005260:Female; D005796:Genes; D008040:Genetic Linkage; D007527:Isoenzymes / Q000235:genetics*; D008099:Liver / Q000201:enzymology*; D008285:Major Histocompatibility Complex; D008297:Male; D009439:Neuraminidase / Q000235:genetics*; D010641:Phenotype; D051381:Rats; D011919:Rats, Inbred Strains; D013045:Species Specificity
chemical_list: D007527:Isoenzymes; D009439:Neuraminidase