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Electronic Journal of Biotechnology

versión On-line ISSN 0717-3458

Resumen

DING-PING, Bai; CHENG-JIANG, Yu  y  YU-LIN, Chen. Association between AA-NAT gene polymorphism and reproductive performance in sheep. Electron. J. Biotechnol. [online]. 2012, vol.15, n.2, pp. 7-7. ISSN 0717-3458.

Arylalkylamine N-acetyltransferase (AA-NAT) is critical enzyme in Melatonin (MLT) biosynthesis for MLT regulating the animal seasonal breeding. In this study, DNA sequencing methods were applied to detect the polymorphisms of the AA-NAT gene in 179 Chinese sheep belonging to two non-seasonal reproduction breeds and two seasonal reproduction breeds. One mutation at exon 3 (NM_001009461:c.486A > G) was firstly described at the sheep AA-NAT locus. Hence, we described the SmaI PCR-RFLP method for detecting EX3 486A > G mutation, frequencies of the AA-NAT-G allele varied from 0.871 to 0.908 in two non-seasonal reproduction breeds and 0.517 to 0.578 in two seasonal reproduction breeds. The associations of SmaI polymorphism with estrus traits was analyzed in non-seasonal reproduction breeds sheep and seasonal reproduction breeds sheep, the significant statistical results were found between them, the GG genotype frequencies was higher in non-seasonal reproduction breeds (p < 0.001), while, the GA genotype frequencies was higher in seasonal reproduction breeds (p < 0.05). Hence, the EX3 486A > G mutation could facilitate association analysis and serve as a genetic marker for Chinese sheep breeding and genetics.

Palabras clave : AA-NAT gene; polymorphism; reproduction; seasonality; sheep.

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