Plasma corticosterone concentrations in diabetic (db) mice maintained on two different inbred backgrounds were found to be elevated significantly when compared to normal controls. These data are similar to that reported with the phenotypically similar obese (ob) mouse. These results suggest that the hyperadrenolcorticism is not related to the primary gene action of either gene but rather is a consequence of the development of the obesity-diabetes syndromes.

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The Jackson Laboratory, Bar Harbor; Maine (L. P.K., D. L 6.) and lnstitute of Ecology and Genetics, Aarhus UniversitK Aarhus, Denmark (J. P. H.)Genetic variants that affect the heat stability and ionic charge of the adult isozyme of glycerol-3-phosphate dehydrogenase (EC 1.1.1.8) map to a gene, Gdc-1, located on chromosome 15. A second isozyme of glycerol-3-phosphate dehydrogenase, structurally homologous to the product of the Gdc-I locus and expressed predominantly in undifferentiated tissues, has previously been identified. We have now discovered an electrophoretic variant of this embryonic isozyme. This expression is determined by a codominant allele of the gene, Gdc-2, that maps to the distal end of chromosome 9 as inferred from the observed gene order Mpi-l-d-Mod-1 -Gdc-2.

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