| Abstrakt: |
We have previously reported on a mouse liver-specific genetic polymorphism associated with altered sialylation of lysosomal a-mannosidase. A second electrophoretic polymorphism for liver lysosomal a-mannosidase has now been found and characterized. This variation, between SWR/J and SM/JCv inbred mice, is determined by a single genetic locus (Map-2) on chromosome 17 and appears to be the result of further differences in sialylation of the lysosomal enzyme. The Map-2 gene appears to affect the processing of liver, spleen, and lung lysosomal a-mannosidase, whereas the Map-1 gene appears to be specific to the processing of liver lysosomal a-mannosidase (Dizik and Elliott, 1977). The more negatively charged electrophoretic liver phenotype (MA-A) characteristic of the SM/JCv strain is recessive to the phenotype (MA-B) characteristic of the SWR/J strain. In contrast, at the Map-1 locus, the more negatively charged phenotype is dominant. The electrophoretic pattern of development of the liver enzyme from SM/JCv mice is described. |
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