›› 2013, Vol. 40 ›› Issue (11): 134-138.

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Genetic Polymorphism of TLR4 Gene and its Associations with Somatic Cell Score in Chinese Holstein Cattle

CHEN Ren-jin1,2, WANG Zhen-zhen3, YANG Zhang-ping2, ZHU Xiao-rong1, JI De-jun2, MAO Yong-jiang2   

  1. 1. Experimental Animal Centre, Xuzhou Medical College, Xuzhou 212004, China;
    2. College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China;
    3. Department of Cell Biology, Xuzhou Medical College, Xuzhou 212004, China
  • Received:2013-03-11 Online:2013-11-20 Published:2013-12-19

Abstract: The polymorphism of toll-like receptor 4(TLR4) gene and its correlation with somatic cell score (SCS) in Chinese Holstein cattle were analyzed for the purpose of providing molecular markers in the marker-assisted selections (MAS) to accelerate the disease-resistant breeding progress in Chinese Holstein cattle. The polymorphism of TLR4 gene was detected by PCR-RFLP and PCR-SSCP technique in 610 Chinese Holstein cattle cattle from 30 bull families. The associations between polymorphic sites of TLR4 gene and SCS were analyzed by the least square mean analysis. Two SNPs were found, SNP -226 G>C was found in the 5' flanking region of TLR4 gene, three genotypes (GG, GC and CC) were found in 610 Chinese Holstein cattle by PCR-RFLP, and the frequencies of GG, GC and CC genotypes were 0.208, 0.482 and 0.310, respectively. SNP 1760 C>T was found in the exon 3 of TLR4 gene, three genotypes (GG, GC and CC) were found in 610 Chinese Holstein cattle by PCR-SSCP, and the frequencies of CC, TC and TT genotypes was 0.738, 0.225 and 0.007, respectively. Chi-square tested showed Chinese Holstein cattle was not in Hardy-Weinberg equilibrium at the two sites. There were no significant differences in SCS among genotypes for SNP -226 G>C, least square mean of SCS for CC genotype was very significantly lower than that for TT and TC genotypes(P<0.01). CC genotype for SNP 1760 C>T site had a great genetic effect on SCS in Chinese Holstein cattle, which could be used as a candidate marker for mastitis resistance selection in dairy cattle.

Key words: Chinese Holstein cattle; TLR4 gene; PCR-RFLP; PCR-SSCP; polymorphism; SCS

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