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A novel HESX1 splice mutation causes isolated GH deficiency by interfering with mRNA processing.

Abstract：

OBJECTIVE:Mutations in HESX1 represent a rare cause of GH deficiency (GHD) associated with a broad spectrum of other anomalies. We searched for causative mutations in a cohort of 244 Italian patients affected by combined and isolated GHD (IGHD). METHODS:The HESX1 gene-coding region and exon-intron boundaries were screened by denaturing HPLC scanning. RESULTS:A novel mutation adjacent to the invariant donor splice site of intron 2 (c.357+3G>A) was identified at the heterozygous state in an IGHD patient. The in vitro and in vivo mRNA analysis of the wild-type HESX1 allele revealed the presence of the whole cDNA and two isoforms lacking exon 2 and exons 2-3 respectively. The mutant HESX1 allele yielded only two splicing products, the whole cDNA and the cDNA missing exons 2-3, whereas the mRNA lacking exon 2 was absent. An in vitro assay demonstrated that the exon 2-deleted mRNA, predicting a prematurely truncated protein, is subjected to nonsense-mediated mRNA decay (NMD). CONCLUSIONS:The c.357+3G>A mutation prevents the generation of one of the alternative isoforms normally produced by the wild-type allele, predicting a truncated HESX1 protein. The mutation is likely to cause IGHD in the heterozygous patient by interfering with the downregulation of HESX1 expression mediated by alternative splicing and NMD. Our results open new insight into the mechanism of HESX1 regulation suggesting that the coupling of alternative splicing and NMD might play a fundamental role in directing the HESX1 expression, and that the alteration of this process might lead to severe consequences.

journal_name

Eur J Endocrinol

journal_title

European journal of endocrinology

authors

Vivenza D,Godi M,Faienza MF,Mellone S,Moia S,Rapa A,Petri A,Bellone S,Riccomagno S,Cavallo L,Giordano M,Bona G

doi

10.1530/EJE-11-0047

subject

Has Abstract

pub_date

2011-05-01 00:00:00

pages

705-13

issue

5

eissn

0804-4643

issn

1479-683X

pii

EJE-11-0047

journal_volume

164

pub_type

杂志文章

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