RESUMO

Polymorphisms of the CART gene were investigated by PCR-single-strand conformation polymorphism analysis in 540 samples from 10 goat breeds. Ten novel single-nucleotide polymorphisms as well as three microsatellites were detected; a mutation, 77T → C, led to an amino acid change (Leu → Ser). Associations between polymorphic loci and reproductive traits were analyzed in Chuandong White, Guizhou White and Gulin Ma breeds. Mutation at position 524 had no significant effect on litter size in these three goat breeds. The polymorphism 539C → A differed significantly among the three breeds (P < 0.05); C(7)T(8)/C(9)T(8) at 939 was associated with larger litter size (P < 0.05) than genotypes C(7)T(8)/C(7)T(8) and C(7)T(8)/C(8)T(8). No significant association of birth weight was found with gene variation (524C → T, 539C → A and 939 CnTn). These findings could be valuable for marker-assisted selection for goat breeding.

Assuntos

Cabras/genética , Proteínas do Tecido Nervoso/genética , Polimorfismo de Nucleotídeo Único , Polimorfismo Conformacional de Fita Simples/genética , Reprodução/genética , Animais , Sequência de Bases , Biomarcadores , Peso ao Nascer/genética , Cruzamento , Tamanho da Ninhada de Vivíparos/genética , Repetições de Microssatélites/genética , Reação em Cadeia da Polimerase , Análise de Sequência de DNA