Characterization of Gonadotrophin‐Releasing Hormone Precursor cDNA in the Old World Mole‐Rat Cryptomys Hottentotus Pretoriae: High Degree of Identity with the New World Guinea Pig Sequence
Identifieur interne : 003015 ( Main/Exploration ); précédent : 003014; suivant : 003016Characterization of Gonadotrophin‐Releasing Hormone Precursor cDNA in the Old World Mole‐Rat Cryptomys Hottentotus Pretoriae: High Degree of Identity with the New World Guinea Pig Sequence
Auteurs : T. Kalamatianos [Royaume-Uni] ; L. Du Toit [Royaume-Uni, Afrique du Sud] ; E. Hrabovszky [Hongrie] ; I. Kall [Royaume-Uni, Hongrie] ; P. J. Marsh [Royaume-Uni] ; N. C. Bennett [Afrique du Sud] ; C. W. Coen [Royaume-Uni]Source :
- Journal of Neuroendocrinology [ 0953-8194 ] ; 2005-05.
English descriptors
- Teeft :
- Accession, Amino, Amino acid, Amino acid sequence, Amino acids, Blackwell publishing, Cdna, Cryptomys hottentotus pretoriae, Decapeptide, Gnrh, Gnrh1, Gnrh1 mrna, Gnrh1 precursor, Gnrh1 precursor mrna, Gnrh1 precursor sequence, Guinea, Guinea pigs, High degree, Hystricognath rodents, Mammal, Mature peptide, Mrna, Neurones, Peptide, Precursor, Preoptic, Primer, Reproductive, Rostral preoptic area.
Abstract
Regulation of pituitary gonadotrophins by the decapeptide gonadotrophin‐releasing hormone 1 (GnRH1) is crucial for the development and maintenance of reproductive functions. A common amino acid sequence for this decapeptide, designated as ‘mammalian’ GnRH, has been identified in all mammals thus far investigated with the exception of the guinea pig, in which there are two amino acid substitutions. Among hystricognath rodents, the members of the family Bathyergidae regulate reproduction in response to diverse cues. Thus, highveld mole‐rats (Cryptomys hottentotus pretoriae) are social bathyergids in which breeding is restricted to a particular season in the dominant female, but continuously suppressed in subordinate colony members. Elucidation of reproductive control in these animals will be facilitated by characterization of their GnRH1 gene. A partial sequence of GnRH1 precursor cDNA was isolated and characterized. Comparative analysis revealed the highest degree of identity (86%) to guinea pig GnRH1 precursor mRNA. Nevertheless, the deduced amino acid sequence of the mole‐rat decapeptide is identical to the ‘mammalian’ sequence rather than that of guinea pigs. Successful detection of GnRH1‐synthesizing neurones using either a guinea pig GnRH1 riboprobe or an antibody against the ‘mammalian’ decapeptide is consistent with the guinea pig‐like sequence for the precursor and the classic ‘mammalian’ form for the decapeptide. The high degree of identity in the GnRH1 precursor sequence between this Old World mole‐rat and the New World guinea pig is consistent with the theory that caviomorphs and phiomorphs originated from a common ancestral line in the Palaeocene to mid Eocene, some 63–45 million years ago.
Url:
DOI: 10.1111/j.1365-2826.2005.01307.x
Affiliations:
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A common amino acid sequence for this decapeptide, designated as ‘mammalian’ GnRH, has been identified in all mammals thus far investigated with the exception of the guinea pig, in which there are two amino acid substitutions. Among hystricognath rodents, the members of the family Bathyergidae regulate reproduction in response to diverse cues. Thus, highveld mole‐rats (Cryptomys hottentotus pretoriae) are social bathyergids in which breeding is restricted to a particular season in the dominant female, but continuously suppressed in subordinate colony members. Elucidation of reproductive control in these animals will be facilitated by characterization of their GnRH1 gene. A partial sequence of GnRH1 precursor cDNA was isolated and characterized. Comparative analysis revealed the highest degree of identity (86%) to guinea pig GnRH1 precursor mRNA. Nevertheless, the deduced amino acid sequence of the mole‐rat decapeptide is identical to the ‘mammalian’ sequence rather than that of guinea pigs. Successful detection of GnRH1‐synthesizing neurones using either a guinea pig GnRH1 riboprobe or an antibody against the ‘mammalian’ decapeptide is consistent with the guinea pig‐like sequence for the precursor and the classic ‘mammalian’ form for the decapeptide. The high degree of identity in the GnRH1 precursor sequence between this Old World mole‐rat and the New World guinea pig is consistent with the theory that caviomorphs and phiomorphs originated from a common ancestral line in the Palaeocene to mid Eocene, some 63–45 million years ago.</div></front></TEI><affiliations><list><country><li>Afrique du Sud</li><li>Hongrie</li><li>Royaume-Uni</li></country><region><li>Angleterre</li><li>Grand Londres</li></region><settlement><li>Londres</li></settlement><orgName><li>King's College de Londres</li></orgName></list><tree><country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Kalamatianos, T" sort="Kalamatianos, T" uniqKey="Kalamatianos T" first="T." last="Kalamatianos">T. Kalamatianos</name></region><name sortKey="Coen, C W" sort="Coen, C W" uniqKey="Coen C" first="C. W." last="Coen">C. W. Coen</name><name sortKey="Du Toit, L" sort="Du Toit, L" uniqKey="Du Toit L" first="L." last="Du Toit">L. 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