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Expression of the growth hormone variant gene in human placenta


, : Expression of the growth hormone variant gene in human placenta. Journal of Clinical Endocrinology and Metabolism 64(3): 635-637

Besides the hGH-N gene, which codes for the pituitary 22 and 20K GH variants, the human genome contains a second GH gene, namely the GH-V, which has been thought to be silent. We recently discovered a placental variant of human growth hormone (hPGH), which appears in maternal serum at mid-pregnancy and which rises in concentration thereafter to term. As hPGH and GH-V proteins display very similar characteristics, including a high affinity for hepatic GH receptors, they could be identical. To verify this hypothesis, we sought hGH-V mRNA in placenta. Hybridization experiments were performed between dot-blotted mRNA originating either from placenta of from one pituitary hGH secreting adenoma and synthetic polynucleotide probes corresponding to specific portions of the hGH-V or hGH-N gene sequences. The results indicate that the V gene is indeed expressed in the placenta and, at a very low level, in the pituitary adenoma. Therefore hPGH is most likely the expression product of the hGH-V gene.


Accession: 005432003

PMID: 3818895

DOI: 10.1210/jcem-64-3-635

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Related references

Liebhaber, S.A.; Urbanek, M.; Ray, J.; Tuan, R.S.; Cooke, N.E., 1989: Characterization and histologic localization of human growth hormone-variant gene expression in the placenta. The human growth hormone-variant (hGH-V) gene is one of five highly similar growth hormone-related genes clustered on the short arm of chromosome 17. Although the pattern of expression of the adjacent normal growth hormone (hGH-N) and chorionic so...

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