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Biology of Reproduction, Vol 47, 665-675, Copyright © 1992 by Society for the Study of Reproduction

ARTICLES

Expression of an endogenous murine leukemia virus-related proviral sequence is androgen regulated and primarily restricted to the epididymis/vas deferens and oviduct/uterus

GA Cornwall, MC Orgebin-Crist and SR Hann
Center for Reproductive Biology Research, Vanderbilt University School of Medicine, Nashville, Tennessee 37232.

A cDNA representing a 5.2-kb defective, endogenous murine leukemia proviral sequence (EPI-EPS) was isolated from a C57BL/6 mouse cDNA epididymal library. Northern blot analysis demonstrated that EPI-EPS was predominantly expressed in the C57BL/6 mouse epididymis and vas deferens with 10-fold lower expression in the seminal vesicle, kidney, and submandibular gland. Analysis of tissues from other inbred strains of mice as well as the wild mouse, Mus musculus musculus, showed a similar pattern of tissue expression. EPI-EPS expression was also highly androgen regulated in both the reproductive and nonreproductive tissues of the C57BL/6 strain. However, a differential response to testosterone replacement was observed between tissues. Expression of EPI-EPS mRNA in the epididymis and vas deferens exhibited only a partial recovery to precastration levels after testosterone replacement; in the kidney and submandibular gland there was a complete recovery of EPI-EPS expression. Finally, EPI-EPS expression was also highly restricted in the female tissues, with expression limited to the oviduct and uterus. EPI-EPS, however, was not estrogen regulated in the female. These results suggest that a proviral sequence, EPI-EPS, is expressed in M. m. musculus and several inbred strains of mice due to its integration near a highly tissue-specific and androgen-regulated genetic locus.


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