GnRH receptors play vital roles in mammalian reproduction via regulation of gonadotropin
secretion, which is essential for gametogenesis and production of gonadal steroids. GnRH
receptors for more than 20 mammalian species have been sequenced, including human,
mouse, and dog. This study reports the molecular cloning and sequencing of GnRH receptor
(GnRHR) cDNA from the pituitary gland of the domestic cat, an important species in
biomedical research. Feline GnRHR cDNA is composed of 981 nucleotides and encodes a
327 amino acid protein. Unlike the majority of mammalian species sequenced so far, but
similar to canine GnRHR, feline GnRHR protein lacks asparagine in position three of the
extracellular domain of the protein. At the amino acid level, feline GnRHR exhibits 95.1%
identity with canine, 93.8% with human, and 88.9% with mouse GnRHR. Comparative
sequence analysis of GnRHRs for multiple mammalian species led to resequencing of
canine GnRHR, which differed from that previously published by a single base change that
translates to a different amino acid in position 193. This single base change was confirmed
in dogs of multiple breeds. Reverse transcriptase PCR analysis of GnRHR messenger RNA in
different tissues from four normal cats indicated the presence of amplicons of varying
lengths, including full-length as well as shortened GnRHR amplicons, pointing to the existence
of truncated GnRHR transcripts in the domestic cat. This study is the first insight
into molecular composition and expression of feline GnRHR and promotes better understanding
of receptor organization, and distribution in various tissues of this species
GnRH receptors play vital roles in mammalian reproduction via regulation of gonadotropinsecretion, which is essential for gametogenesis and production of gonadal steroids. GnRHreceptors for more than 20 mammalian species have been sequenced, including human,mouse, and dog. This study reports the molecular cloning and sequencing of GnRH receptor(GnRHR) cDNA from the pituitary gland of the domestic cat, an important species inbiomedical research. Feline GnRHR cDNA is composed of 981 nucleotides and encodes a327 amino acid protein. Unlike the majority of mammalian species sequenced so far, butsimilar to canine GnRHR, feline GnRHR protein lacks asparagine in position three of theextracellular domain of the protein. At the amino acid level, feline GnRHR exhibits 95.1%identity with canine, 93.8% with human, and 88.9% with mouse GnRHR. Comparativesequence analysis of GnRHRs for multiple mammalian species led to resequencing ofcanine GnRHR, which differed from that previously published by a single base change thattranslates to a different amino acid in position 193. This single base change was confirmedin dogs of multiple breeds. Reverse transcriptase PCR analysis of GnRHR messenger RNA indifferent tissues from four normal cats indicated the presence of amplicons of varyinglengths, including full-length as well as shortened GnRHR amplicons, pointing to the existenceof truncated GnRHR transcripts in the domestic cat. This study is the first insightinto molecular composition and expression of feline GnRHR and promotes better understandingof receptor organization, and distribution in various tissues of this species
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