Abstract
Spermatogenesis is a complex process requiring the coordinate expression of a number of testis-specific genes. One of these, Pdha-2, codes for the murine testis-specific isoform of the E1 alpha subunit of the pyruvate dehydrogenase complex. To elucidate the mechanisms regulating its expression in vivo, we have begun to investigate the Pdha-2 promoter in transgenic mice. In this paper, a construct containing 3.0 kb of promoter and upstream sequences is reported to be sufficient for directing the testis-specific expression of a CAT reporter gene in mice harbouring the transgene. Similarly to the endogenous Pdha-2, the CAT gene is expressed in testis in a stage-specific manner. However, the 3.0-kb Pdha-2 promoter is not active in somatic tissue suggesting that repressor elements may be present within these sequences.
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