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The specific activity of G6PD and PGK were measured in the testes, seminal vesicles, and livers of Sxr/+,XX mice, their Sxr/+,XY littermates and normal mice. While G6PD activity was high in the testes of young normal mice and declined as the testes matured, in the testes of Sxr/+,XX mice activity remained high, suggesting a failure of the Sertoli cells to mature normally. The activity of PGK was low in the testes of young normal mice, and increased as the testes matured. The testes of young Sxr/+,XX mice had high activity of this enzyme which remained high into adulthood. The high activity in young mice suggests an abnormality in the somatic cells. The seminal vesicle and liver measurements of G6PD and PGK confirmed that the Sxr/+,XX mice were phenotypically normal males except with respect to the testis. The developmental patterns of both enzymes in testes lacking germinal cells indicate that the maturation of the somatic cells of the normal testis is influenced by the presence of germinal cells.

Enzyme levels in testis and other tissues of genetically sex-reversed mice