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GENETIC VARIATION AT A LOCUS (TAM-1) FOR SUBMAXILLARY GLAND PROTEASE IN THE MOUSE AND ITS LOCATION ON CHROMOSOME 7
Loren C. Skow 1
1 The Jackson Laboratory, Bar Harbor, Maine 04609
Electrophoretic and activity variants for a testosterone-induced esteroprotease have been discovered in submaxillary glands from inbred strains of mice. The enzyme is tentatively designated tamase (TAM-1) and the variant genetic locus is Tam-1. The alleles Tam-1a and Tam-1b determine electrophoretically distinct zones of tamase activity, while Tam-1c produces no detectable enzyme activity. Data from recombinant inbred strains and B6AF1 x B6 and B6D2F1 x B6 backcrosses established linkage of Tam-1 to glucose phosphate isomerase (Gpi-1), pink-eyed dilution (p) and ß-hemoglobin (Hbb) on chromosome 7. The gene order is Gpi-1—Tam-1—p—Hbb. Analysis of congenic resistant strains indicates that Tam-1 is closely linked to the minor histocompatibility locus, H-4. TAM-1 was not cross-reactive with antisera to mouse nerve growth factor, submaxillary renin, or tamases A and D.
Submitted on February 28, 1978Revised on July 3, 1978
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