Polimorfismo nos genes da leptina e do receptor de melatonina em búfalas (Bubalus bubalis)
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Data
2012-04-25
Autores
Zetouni, Larissa [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O gene responsável pela codificação do hormônio leptina tem sido associado à produção de leite, e diversos polimorfismos encontrados nesse gene foram associados a características produtivas em bovinos. O objetivo do presente estudo foi a identificação do polimorfismo LEP-1620 (A/G) no gene bubalino da leptina e suas possíveis associações com as produções de leite, gordura, proteína e porcentagens de gordura e proteína. Foram coletadas amostras de pelo da cauda de 200 búfalas, e após a extração do DNA as amostras foram genotipadas pela técnica PCR-RFLP. Três amostras foram sequenciadas e foi encontrado um SNP na posição 70 do íntron 2 do gene da leptina, caracterizado pela substituição de um A por um G. As médias das produções mensais de leite, gordura, proteína e as porcentagens de gordura e proteína foram avaliadas em um modelo misto. Os genótipos encontrados (AA, AG, GG) foram positivamente associados às características porcentagem de gordura e de proteína (p<0,05), sendo que os animais AA apresentaram médias superiores para as características. As curvas de lactação para as características produção de leite e porcentagens de gordura e proteína apresentaram trajetórias semelhantes para os três genótipos. Esses resultados indicam que o polimorfismo LEP-1620 (A/G) pode ser utilizado futuramente como marcador molecular para as características porcentagem de gordura e proteína do leite de búfalas
The gene responsible for encoding the hormone leptin has been associated with milk production, and several polymorphisms of this gene were associated with production traits in cattle. The aim of the present study was to identify the LEP-1620 (A/G) polymorphism in the buffalo leptin gene and its possible associations with milk, fat and protein yield, and fat and protein percentages. Samples of tail hair from 200 buffalo cows were collected, and after DNA extraction the samples were genotyped by PCR-RFLP. Three samples were sequenced and an SNP was found at position 70 of intron 2 in the leptin gene, characterized by the substitution of an A for a G. The means from monthly milk, fat and protein yield and falt and protein percentages were evaluated by a mixed model. The genotypes found (AA, AG, GG) were positively associated with fat and protein percentages (p<0,005), and the AA animals showed the highest means for this traits. The lactation curves for milk yield and fat and protein percentages showed similar trajectories for the three genotypes. These results indicate that the LEP-1620 (A/G) polymorphism can be used in the future as a molecular marker for fat and protein percentages traits of buffalo cow’s milk
The gene responsible for encoding the hormone leptin has been associated with milk production, and several polymorphisms of this gene were associated with production traits in cattle. The aim of the present study was to identify the LEP-1620 (A/G) polymorphism in the buffalo leptin gene and its possible associations with milk, fat and protein yield, and fat and protein percentages. Samples of tail hair from 200 buffalo cows were collected, and after DNA extraction the samples were genotyped by PCR-RFLP. Three samples were sequenced and an SNP was found at position 70 of intron 2 in the leptin gene, characterized by the substitution of an A for a G. The means from monthly milk, fat and protein yield and falt and protein percentages were evaluated by a mixed model. The genotypes found (AA, AG, GG) were positively associated with fat and protein percentages (p<0,005), and the AA animals showed the highest means for this traits. The lactation curves for milk yield and fat and protein percentages showed similar trajectories for the three genotypes. These results indicate that the LEP-1620 (A/G) polymorphism can be used in the future as a molecular marker for fat and protein percentages traits of buffalo cow’s milk
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Palavras-chave
Bubalus bubalis, Polymorphism, Búfalo, Polimorfismo (Genetica)
Como citar
ZETOUNI, Larissa. Polimorfismo nos genes da leptina e do receptor de melatonina em búfalas (Bubalus bubalis). 2012. ix, 59 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2012.