Abstract:
OBJECTIVE:To determine the frequency of mutations of the gonadotropin-releasing hormone receptor (GnRHR) and of the G protein-coupled receptor 54 (GPR54) genes in normosmic idiopathic hypogonadotropic hypogonadism (IHH). METHODS:In a retrospective study we analyzed the GnRHR and the GPR54 genes of 45 IHH patients and 50 controls. Genomic DNA was amplified by PCR to obtain partially overlapping amplicons encompassing the exon-intron boundaries of the GnRHR and GPR54 genes and analyzed by single-stranded conformation polymorphism gel electrophoresis and/or DNA sequencing. RESULTS:One heterozygous R262Q mutation of the GnRHR gene was identified in one patient with familial IHH. The silent single-nucleotide polymorphism (SNP) 453C > T occurred at the same frequency in patients and controls. One patient with sporadic IHH and consanguineous parents showed a novel homozygous sequence variation of the GPR54 gene (1001_1002insC) resulting in an open reading frame shift and elongation of 43 amino acids with an increased number of proline residues in the intracellular receptor domain. This patient had delayed puberty, low testosterone (3.4 nmol/l), and low-normal LH and FSH levels responsive to GnRH. Pulsatile GnRH administration normalized testosterone levels and induced spermatogenesis sufficiently to induce a pregnancy with assisted reproduction. Two common SNPs in exon 1 and exon 5 of the GPR54 gene showed similar frequency distribution and hormonal profiles in IHH and controls. CONCLUSIONS:Mutations of the GnRHR and of the GPR54 gene are rare in IHH and should be investigated especially in cases with autosomal recessive transmission. Common SNPs of the GnRHR and GPR54 genes do not play any role in IHH.
journal_name
Eur J Endocrinoljournal_title
European journal of endocrinologyauthors
Lanfranco F,Gromoll J,von Eckardstein S,Herding EM,Nieschlag E,Simoni Mdoi
10.1530/eje.1.02031subject
Has Abstractpub_date
2005-12-01 00:00:00pages
845-52issue
6eissn
0804-4643issn
1479-683Xpii
153/6/845journal_volume
153pub_type
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journal_title:European journal of endocrinology
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更新日期:2004-11-01 00:00:00
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更新日期:2000-12-01 00:00:00
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更新日期:2014-06-01 00:00:00
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pub_type: 杂志文章,随机对照试验
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更新日期:2009-03-01 00:00:00
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更新日期:1997-04-01 00:00:00
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更新日期:2006-02-01 00:00:00
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更新日期:2014-10-01 00:00:00
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更新日期:2012-03-01 00:00:00
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更新日期:2003-01-01 00:00:00