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Identification of a splice-site mutation in the human growth hormone-variant gene

, : Identification of a splice-site mutation in the human growth hormone-variant gene. American Journal of Human Genetics 48(6): 1168-1174

The human growth-hormone-variant (hGH-V) gene normally expresses two alternatively spliced forms of mRNA--hGH-V and hGH-V2--in the placenta. hGH-V2 mRNA differs from hGH-V rDNA by the retention of intron 4 and represents approximately 15% of transcripts at term. In a survey of hGH-V gene expression in 20 placentas of gestational age 8-40 wk, we detected a single placenta that contained, in addition to the two normal hGH-V mRNA species, a set of two slightly larger hGH-V mRNAs. Sequence analysis of the elongated hGH-V mRNA demonstrated retention of the first 12 bases of intron 2, resulting from both a base substitution at the intron 2 splice-donor dinucleotide (GT----AT) and activation of a cryptic splice-donor site 12 bases downstream. Survey of a total of 60 additional chromosomes failed to reveal additional incidence of this mutation. The mutation, which we have designated hGH-Vintron 2, pos 1 (G----A), represents both an initial example of a nondeletional mutation within the hGH-V gene and corresponding structural alteration in the encoded hGH-V hormone.


PMID: 2035535

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