Organization and expression of prostatic steroid binding protein genes

Journal of Steroid Biochemistry
M ParkerM J Page

Abstract

The function of regulatory regions of DNA, which flank the genes for prostatic steroid binding protein, is being analysed by introducing the cloned genes into heterologous cells. Two non-allelic genes for the C3 polypeptide, C3(1) and C3(2) have been transfected into androgen-responsive S115 cells using SV2-gpt vectors. The genes have been introduced either intact or as so-called fusion genes consisting of putative C3 promoters plus human beta-interferon cDNA. Both genes for C3 were accurately transcribed and their expression was stimulated 5-10-fold with 10(-8) M testosterone. Thus we should be able to define at least one region of DNA which confers androgen sensitivity to the genes. Although both genes were expressed similarly in S115 cells only C3(1) is responsible for C3 in vivo and C3(2) is transcribed poorly, if at all. The most likely explanation for the difference is that in vivo the C3(2) gene remains hypermethylated whereas the DNA which was introduced into S115 cells was unmethylated. This result supports the notion that the state of DNA methylation is important for controlling the transcription of genes.

References

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