Two novel SNPs of the ABCG2 gene and its associations with milk traits in Chinese Holsteins.
The ATP-binding cassette transporter ABCG2 (also known as breast cancer resistance protein, BCRP) belongs to the ATP-binding cassette (ABC) family of transmembrane drug transporters, playing a crucial role in the protection of various cells and tissues against xenotoxins and/or endotoxins. Recently, several studies have proposed it as the potential gene underlying the QTL on bovine chromosome 6. Hence, in this study, the PCR-SSCP method was applied to detect two polymorphisms (A → C and A → G) in the target sequence coding nucleotide-binding domain (NBD) region of ABCG2 and evaluate its associations with milk production traits and mastitis-related traits among Chinese Holsteins. In the analyzed population, the allelic frequencies for the A and B alleles were 0.5990 and 0.4010, respectively and the genotypic frequencies were in Hardy-Weinberg disequilibrium (P < 0.01). Moreover, significant statistical relationships between the polymorphisms of ABCG2 gene and following traits, including milk yields, milk protein percentage and somatic cell scores (SCS), were found (P < 0.05). When compared with AA genotype, BB genotype was associated with higher milk yields during 1st and 2nd lactations, as well as lower milk protein percentage and SCS. Thus, BB genotype is suggested to be a molecular marker for superior milk performance.
Yue
Wangping
W
Institute of Cellular and Molecular Biology, College of Life Science, Xuzhou Normal University, 221116 Xuzhou, Jiangsu, People's Republic of China. yuewp@yahoo.com.cn
Fang
Xingtang
X
Zhang
Chunlei
C
Pang
Yonghong
Y
Xu
Haixia
H
Gu
Chuanwen
C
Shao
Ruying
R
Lei
Chuzhao
C
Chen
Hong
H
D018528:ATP-Binding Cassette Transporters / Q000235:genetics*; D000483:Alleles; D000818:Animals; D001483:Base Sequence; D002417:Cattle; D002681:China; D003611:Dairy Products; D005260:Female; D005838:Genotype; D006801:Humans; D008892:Milk / Q000737:chemistry*; D008894:Milk Proteins / Q000032:analysis / Q000235:genetics; D020641:Polymorphism, Single Nucleotide; D018807:Polymorphism, Single-Stranded Conformational; D020033:Protein Isoforms / Q000235:genetics; D017422:Sequence Analysis, DNA
D018528:ATP-Binding Cassette Transporters; D008894:Milk Proteins; D020033:Protein Isoforms