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          Institute: MPI für medizinische Forschung     Collection: Abteilung Molekulare Neurobiologie     Display Documents

ID: 22168.0, MPI für medizinische Forschung / Abteilung Molekulare Neurobiologie
The human growth hormone gene locus: structure, evolution, and allelic variations
Translation of Title:The human growth hormone gene locus: structure, evolution, and allelic variations
Authors:Hirt, H.; Kimelman, J.; Birnbaum, Morris J.; Chen, E. Y.; Seeburg, Peter H.; Eberhardt, N. L.; Barta, Andrea
Date of Publication (YYYY-MM-DD):1987-02
Title of Journal:DNA
Journal Abbrev.:DNA
Issue / Number:1
Start Page:59
End Page:70
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:Genomic clones containing the closely related genes for human growth hormone (hGH) and chorionic somatomammotropin (hCS) were obtained from genomic bacteriophage lambda and cosmid libraries. The entire GH/CS chromosomal locus was reconstructed utilizing overlapping restriction fragments characterized from the isolated clones. The hGH/hCS locus contains two GH genes and three CS genes spanning 48 kb of DNA in the order: 5-(hGH-1/hCS-5/hCS-1/hGH-2/hCS-2)-3, confirming analysis of cosmid clones obtained from a different human library (Barsh et al., 1983). To complete the characterization of the hCS genes, the nucleotide sequence of the hCS-5 gene was determined. Sequence analysis revealed a mutation of the 5 splice site at the exon II-intron B boundary, suggesting that the hCS-5 gene is a pseudogene. The nucleotide sequence of an allelic variant of the hCS-2 gene was determined and found to contain a single amino acid substitution and the deletion of a single codon. The hGH/hCS gene locus was further characterized by the localization of at least 27 Alu-type repetitive sequences and identification of three unique sequences in the vicinity of several hGH and hCS genes which define the probable breakpoints of the evolutionary duplication units. These data, combined with the nucleotide sequences of all five GH and CS genes, indicate that the hGH/hCS gene locus has evolved by duplication mechanisms. Evidence for the occurrence of at least one gene conversion event involving the hCS-1 gene precursor and the hCS-2 gene was found, indicating that the hGH/hCS gene locus has evolved by concerted mechanisms. The structure of the hCS genes is discussed in light of recent studies of CS genes from other mammalian species.
External Publication Status:published
Document Type:Article
Communicated by:Wulf Kaiser
Affiliations:MPI für medizinische Forschung/Abteilung Molekulare Neurobiologie/
Identifiers:URI: [Abstract]
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