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. 1990 Jul;10(7):3717–3726. doi: 10.1128/mcb.10.7.3717

Transcription of the rat and mouse proenkephalin genes is initiated at distinct sites in spermatogenic and somatic cells.

D L Kilpatrick 1, S A Zinn 1, M Fitzgerald 1, H Higuchi 1, S L Sabol 1, J Meyerhardt 1
PMCID: PMC360821  PMID: 2355920

Abstract

During spermatogenesis, several genes are expressed in a germ cell-specific manner. Previous studies have demonstrated that rat and mouse spermatogenic cells produce a 1,700-nucleotide proenkephalin RNA, while somatic cells that express the proenkephalin gene contain a 1,450-nucleotide transcript. Using cDNA cloning, RNA protection, and primer extension analyses, we showed that transcription of the rat and mouse spermatogenic-cell RNAs is initiated downstream from the proenkephalin somatic promoter in the first somatic intron (intron As). In both species, the germ cell cap site region consists of multiple start sites distributed over a length of approximately 30 base pairs. Within rat and mouse intron As, the region upstream of the germ cell cap sites is GC rich and lacks TATA sequences. A consensus binding site for the transcription factor SP1 was identified in intron As downstream of the proenkephalin germ cell cap site region. These features are characteristic of several previously described promoters that lack TATA sequences. Homologies were also identified between the proenkephalin and rat cytochrome c spermatogenic-cell promoters, including the absence of a TATA box, a multiple start site region, and several common sequences. This promoter motif thus may be shared with other genes expressed in male germ cells.

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