Abnormal sperm in mice with targeted deletion of the act (activator of cAMP-responsive element modulator in testis) gene

Proceedings of the National Academy of Sciences of the United States of America
Noora KotajaPaolo Sassone-Corsi

Abstract

ACT [activator of cAMP-responsive element modulator (CREM) in testis] is a LIM-only protein that interacts with transcription factor CREM in postmeiotic male germ cells and enhances CREM-dependent transcription. CREM regulates many crucial genes required for spermatid maturation, and targeted mutation of the Crem gene in the mouse germ-line blocks spermatogenesis. Here we report the phenotype of mice in which targeted disruption of the act gene was obtained by homologous recombination. Whereas the seminiferous tubules of the act(-/-) mice contain all of the developmental stages of germ cells and the mice are fertile, the amount of mature sperm in the epididymis is drastically reduced. The residual sperm display severe abnormalities, including fully folded tails and aberrant head shapes. These results indicate that numerous postmeiotic genes under CREM control require the coactivator function of ACT. Thus, the fine-tuning of sperm development is achieved by the coordinated action of two transcriptional regulators.

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