Identification of feline Kiss1 and distribution of immunoreactive kisspeptin in the hypothalamus of the domestic cat

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  • AMELKINA Olga
    Research Unit of Obstetrics and Reproduction in Animals, Department of Obstetrics, Gynaecology and Reproduction, Faculty of Veterinary Sciences, Chulalongkorn University, Bangkok 10330, Thailand Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, Washington, DC 20013, USA
  • TANYAPANYACHON Prattana
    Research Unit of Obstetrics and Reproduction in Animals, Department of Obstetrics, Gynaecology and Reproduction, Faculty of Veterinary Sciences, Chulalongkorn University, Bangkok 10330, Thailand
  • THONGPHAKDEE Ampika
    Wildlife Reproductive Innovation Center, Bureau of Conservation and Research, Zoological Park Organization under the Royal Patronage of H.M. the King, Bangkok, Thailand
  • CHATDARONG Kaywalee
    Research Unit of Obstetrics and Reproduction in Animals, Department of Obstetrics, Gynaecology and Reproduction, Faculty of Veterinary Sciences, Chulalongkorn University, Bangkok 10330, Thailand

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  • Identification of feline <i>Kiss1</i> and distribution of immunoreactive kisspeptin in the hypothalamus of the domestic cat

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<p> In recent years, the Kiss1 gene has been reported in a number of vertebrate species, and a substantial dataset has been acquired to demonstrate the critical role of kisspeptins in the reproductive system; yet limited information is available for carnivores. In the present study, we identified and characterized feline Kiss1 by isolating and cloning its full-length cDNA in the domestic cat hypothalamus and caracal testis, using the method of rapid amplification of cDNA ends. Additionally, we isolated and cloned the 3′ end of Kiss1 cDNA, containing kisspeptin-10 (Kp10), from the ovaries of a clouded leopard and Siberian tiger. Nucleotide sequencing revealed that domestic cat Kiss1 cDNA is of 711 base pairs and caracal Kiss1 cDNA is of 792 base pairs, both having an open reading frame of 450 base pairs, encoding a precursor protein Kiss1 of 149 amino acids. The core sequence of the feline kisspeptin Kp10 was found to be identical in all species analyzed here and is highly conserved in other vertebrate species. Using an anti-Kp10 antibody, we found the immunoreactive kisspeptin to be localized in the periventricular and infundibular nuclei of the cat hypothalamus. The results show that kisspeptin is highly conserved among different feline families, and its immunoreactive distribution in the hypothalamus may indicate its physiological function in the domestic cat.</p>

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