Bovine leukemia virus proviral load is more strongly associated with bovine major histocompatibility complex class II DRB3 polymorphism than with DQA1 polymorphism in Holstein cow in Japan

Retrovirology

Ayumu Ohno¹  Yoko Aida²  Shin-nosuke Takeshima³ 

[1]0000000094465255, grid.7597.c, Viral Infectious Diseases Unit, RIKEN, 351-0198, Wako, Saitama, Japan

[2]0000000094465255, grid.7597.c, Viral Infectious Diseases Unit, RIKEN, 351-0198, Wako, Saitama, Japan

[3]Nakamura Laboratory, Baton Zone Program, RIKEN Cluster for Science, Technology and Innovation Hub, 351-0198, Wako, Saitama, Japan

[4]0000000094465255, grid.7597.c, Viral Infectious Diseases Unit, RIKEN, 351-0198, Wako, Saitama, Japan

[5]Photonics Control Technology Team, RIKEN Center for Advanced Photonics, 3510198, Wako, Saitama, Japan

[6]0000 0004 0530 9007, grid.444497.e, Department of Food and Nutrition, Jumonji University, 352-8510, Niiza, Saitama, Japan

关键词: BoLA;    BoLA;    Bovine leukemia virus;    Proviral load;    Japanese Holstein;   

DOI  :  10.1186/s12977-019-0476-z

来源: publisher

【 摘 要 】

Bovine leukemia virus (BLV) causes enzootic bovine leukosis and is closely related to the human T-lymphotropic virus. Bovine major histocompatibility complex (BoLAs) are used extensively as markers of disease and immunological traits in cattle. For BLV diagnosis, proviral load is a major diagnosis index for the determination of disease progression and transmission risk. Therefore, we investigated the frequency of BoLA-DRB3 alleles, BoLA-DQA1 alleles, and haplotypes of BoLA class II isolated from the heads of 910 BLV-infected cows out of 1290 cows assessed from BLV-positive farms, in a nationwide survey from 2011 to 2014 in Japan. Our aim was to identify BoLA class II polymorphisms associated with the BLV proviral load in the Holstein cow. The study examined 569 cows with a high proviral load and 341 cows with a low proviral load. Using the highest odds ratio (OR) as a comparison index, we confirmed that BoLA-DRB3 was the best marker for determining which cow spread the BLV (OR 13.9 for BoLA-DRB3, OR 11.5 for BoLA-DQA1, and OR 6.2 for BoLA class II haplotype). In addition, DRB3*002:01, *009:02, *012:01, *014:01, and *015:01 were determined as BLV provirus associated alleles. BoLA-DRB3*002:01, *009:02, and *014:01 were determined as resistant alleles (OR > 1), and BoLA-DRB3*012:01 and *015:01 were determined as susceptible alleles (OR < 1). In this study, we showed that BoLA-DRB3 was a good marker for determining which cow spread BLV, and we found not only one resistant allele (BoLA-DRB3*009:02), but also two other disease-resistant alleles and two disease-susceptible alleles. This designation of major alleles as markers of susceptibility or resistance can allow the determination of the susceptibility or resistance of most cows to disease. Overall, the results of this study may be useful in eliminating BLV from farms without having to separate cows into several cowsheds.

【 授权许可】

CC BY