Journal
MOLECULAR AND CELLULAR ENDOCRINOLOGY
Volume 366, Issue 1, Pages 59-67Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.mce.2012.11.018
Keywords
Luteinizing hormone receptor; Leydig cell hypoplasia; Micropenis; Male sex differentiation
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Funding
- German Research Foundation [GR 1547/13-1]
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The luteinizing hormone/chorionic gonadotropin receptor (LHCGR) is essential for normal male sex differentiation. Recently, the additional primate-specific exon 6A of the LHCGR was discovered and it was shown to act as regulatory element at the transcriptional level. Compound heterozygous mutations in exon 6A (c.580 A > G) and exon 11 (c.1244T > C) were identified in the LHCGR of a male 46,XY patient with genital malformation. Analysis revealed that mutation c.580A > G in exon 6A affects the splicing pattern resulting in an increase of transcripts containing the internal variants of exon 6A prone to nonsense-mediated decay. In contrast, mutation c.1244T > C results in an amino acid substitution (Ile415Thr), which abolishes signal transduction due to structural changes. When inherited in a compound heterozygous fashion these mutations result in Leydig cell hypoplasia (LCH) type II. Thus this study provides proof that mutations causing aberrant transcription can impair receptor function and thereby be causative of LCH. (C) 2012 Elsevier Ireland Ltd. All rights reserved.
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