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Effects of ghrelin gene genotypes on the growth traits in Chinese cattle.

Mol. Biol. Rep.2012 Jun;39(6):6981-6. doi:10.1007/s11033-012-1527-x
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摘要


Ghrelin is an important peptide that stimulates food intake and regulates energy balance of animals. Single nucleotide polymorphisms of ghrelin gene in three Chinese cattle populations were investigated through PCR-SSCP and DNA sequencing. Five over-lapped DNA fragments were analyzed and a total of three ones exhibited different genotypes. Three genotypes and four SNPs (-415 A > G, -414 T > C, -321 C > A, and -172 A > G) were found on the -544 to +35 bp region (G-1) of ghrelin gene. On the locus of -1037 to -509 bp (G-2), two genotypes and one SNP (-726 A > T) were discovered. And in the exon1, exon2, and intron1 (G-4 locus, (+4 to +427)), two genotypes and one SNP were detected (+205 C > T, located in intron1). Positions of the five SNPs in the 5′ regulatory region might be the transcription factor binding sites. The SNPs at -415 and -414 in the core binding sequence were found to cause the change of the site. Though the SNP at -172 did not change the binding site, it generated one new site at the same time. The frequencies of the genotypes varied differently in the three breeds. Results of ANOVA showed that G-1 was correlative to the ischium width (IW) of Nanyang cattle aged 18 months (p = 0.043). The least square analysis between genotypes at G-1 locus and growth traits in Nanyang cattle showed that the individuals (aged 18 months) with C genotype had greater IW than that of the other two genotypes. The C genotype might serve as one potential candidate genetic marker for cattle growth and development.

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