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Complex alternative splicing of the GH-V gene in the human testis.

Abstract：

:The human growth hormone variant (GH-V) gene is expressed during pregnancy in the syncytiotrophoblast and, as shown recently, in the normal human testis. In addition to the classical transcript encoding for the 22 K major form, intron D-retaining processed mRNAs (GH-V2) have also been described in both tissues. In the present study we analyzed testicular GH-V RNA alternative splicing patterns, a major source of GH variability. We observed three types of GH-V-derived mRNAs by reverse transcription-polymerase chain reaction amplification of GH/placental lactogen mRNA, subsequent cloning into appropriate vectors, vector amplification, restriction-endonuclease map-analysis and double-strand sequencing of GH-V clones. Apart from the conventional splice product encoding classical hGH-V (22K, 191 amino acids (aa)) and intron D-retaining mRNA GH-V2 (230aa), we detected an additional GH-V mRNA variant, GH-Vdelta4, utilizing a competitive splice-donor site 4 bp 5'of the conventional exon 4/intron D splice-donor site, but retaining the genuine intron D/exon 5 splice-acceptor site. This mRNA encodes a putative 25 K protein of 219 amino acids in length, having the first 124 amino acids and, thus, two and a half structural alpha-helices in common with hGH-V.hGH-Vdelta4 has lost the N-glycosylation site at Asn 140 of hGH-V, but acquires a novel site at position 148 as well as a cystein-rich domain in the 65 carboxyl-terminal amino acids, potentially involved in multiple disulfide-bridge formation. Tissue specificity and possible functions for testicular physiology remain to be investigated.

journal_name

Eur J Endocrinol

journal_title

European journal of endocrinology

authors

Untergasser G,Hermann M,Rumpold H,Berger P

doi

10.1530/eje.0.1390424

subject

Has Abstract

pub_date

1998-10-01 00:00:00

pages

424-7

issue

4

eissn

0804-4643

issn

1479-683X

journal_volume

139

pub_type

杂志文章

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