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An Intron 9 CYP19 Gene Variant (IVS9+5G>A), Present in an Aromatase-Deficient Girl, Affects Normal Splicing and Is Also Present in Normal Human Steroidogenic Tissues.

Abstract：

BACKGROUND/AIMS:Splicing CYP19 gene variants causing aromatase deficiency in 46,XX disorder of sexual development (DSD) patients have been reported in a few cases. A misbalance between normal and aberrant splicing variants was proposed to explain spontaneous pubertal breast development but an incomplete sex maturation progress. The aim of this study was to functionally characterize a novel CYP19A1 intronic homozygote mutation (IVS9+5G>A) in a 46,XX DSD girl presenting spontaneous breast development and primary amenorrhea, and to evaluate similar splicing variant expression in normal steroidogenic tissues. METHODS:Genomic DNA analysis, splicing prediction programs, splicing assays, and in vitro protein expression and enzyme activity analyses were carried out. CYP19A1 mRNA expression in human steroidogenic tissues was also studied. RESULTS:A novel IVS9+5G>A homozygote mutation was found. In silico analysis predicts the disappearance of the splicing donor site in intron 9, confirmed by patient peripheral leukocyte cP450arom and in vitro studies. Protein analysis showed a shorter and inactive protein. The intron 9 transcript variant was also found in human steroidogenic tissues. CONCLUSIONS:The mutation IVS9+5G>A generates a splicing variant that includes intron 9 which is also present in normal human steroidogenic tissues, suggesting that a misbalance between normal and aberrant splicing variants might occur in target tissues, explaining the clinical phenotype in the affected patient.

journal_name

Horm Res Paediatr

journal_title

Hormone research in paediatrics

authors

Saraco N,Nesi-Franca S,Sainz R,Marino R,Marques-Pereira R,La Pastina J,Perez Garrido N,Sandrini R,Rivarola MA,de Lacerda L,Belgorosky A

doi

10.1159/000437142

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

275-82

issue

4

eissn

1663-2818

issn

1663-2826

pii

000437142

journal_volume

84

pub_type

杂志文章

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