Lack of association between amino acid sequences of the bovine leukemia virus envelope and varying stages of infection in dairy cattle.

Autor: Cerón Téllez F; Virology, Genetics and Molecular Biology Laboratory, Faculty of Higher Education, Cuautitlan, Veterinary Medicine, Campus 4, National Autonomous University of Mexico, Km. 2.5 Carretera Cuautitlán-Teoloyucan San Sebastián Xhala, Cuautitlán Izcalli Estado de México, C.P. 54714, Mexico. Electronic address: fernandocerontellez@gmail.com., González Méndez AS; Virology, Genetics and Molecular Biology Laboratory, Faculty of Higher Education, Cuautitlan, Veterinary Medicine, Campus 4, National Autonomous University of Mexico, Km. 2.5 Carretera Cuautitlán-Teoloyucan San Sebastián Xhala, Cuautitlán Izcalli Estado de México, C.P. 54714, Mexico. Electronic address: anss.silvana@gmail.com., Tórtora Pérez JL; Virology, Genetics and Molecular Biology Laboratory, Faculty of Higher Education, Cuautitlan, Veterinary Medicine, Campus 4, National Autonomous University of Mexico, Km. 2.5 Carretera Cuautitlán-Teoloyucan San Sebastián Xhala, Cuautitlán Izcalli Estado de México, C.P. 54714, Mexico. Electronic address: tortora@unam.mx., Loza-Rubio E; National Center of Research in Animal Microbiology and Innocuity, INIFAP, CP. 05110, Mexico City, Mexico. Electronic address: loza.elizabeth@inifap.gob.mx., Ramírez Álvarez H; Virology, Genetics and Molecular Biology Laboratory, Faculty of Higher Education, Cuautitlan, Veterinary Medicine, Campus 4, National Autonomous University of Mexico, Km. 2.5 Carretera Cuautitlán-Teoloyucan San Sebastián Xhala, Cuautitlán Izcalli Estado de México, C.P. 54714, Mexico. Electronic address: ramiralh@unam.mx.
Jazyk: angličtina
Zdroj: Virus research [Virus Res] 2020 Mar; Vol. 278, pp. 197866. Date of Electronic Publication: 2020 Jan 20.
DOI: 10.1016/j.virusres.2020.197866
Abstrakt: We collected 724 blood samples from dairy cattle from six Mexican states, and tested them for the presence of antibodies against BLV using a commercial ELISA test. Our study groups consisted of 32 samples: 12 asymptomatic cows, 12 cows with lymphocytosis and 8 samples of tumor tissue of the abomasum and heart of cattle with lymphoma. We designed three pairs of primers to amplify the complete BLV env gene, and obtained a fragment of 1548 nucleotides in length with the sequenced products. According to the phylogenetic tree we constructed to identify the viral genotype, 96.87 % of the sequences grouped into genotype 1, while a single sample from a cow with lymphocytosis (3.13 %) was associated with genotype 3 sequences. The similarity between the Mexican BLV sequences ranged from 0.985-1.00. In addition, the proportion of non-synonymous and synonymous mutations indicated negative selection. We did not identify any conserved residues in the viral protein sequences that could be related to BLV infection stage in cattle. Proviral quantification was performed using quantitative polymerase chain reaction, and we used Mood´s median test as statistical analysis. We found no significant association between proviral load and phase of infection. The sequences showed high similarity without any association between BLV surface glycoprotein and the different infection stages, nor differences in the proviral load. BLV genotype 1 was identified as prevalent in the studied samples, and for the first time in Mexico, we identified BLV genotype 3 in cattle.
Competing Interests: Declaration of Competing Interest The authors have no financial or personal interests that could influence or bias the content of this article. The authors declare that they have no competing interests. All authors have seen and approved the manuscript.
(Copyright © 2020 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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