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• W4313485091 abstract "Buparvaquone remains the only effective therapeutic agent for the treatment of tropical theileriosis caused by Theileria annulata . However, an increase in the rate of buparvaquone treatment failures has been observed in recent years, raising the possibility that resistance to this drug is associated with the selection of T . annulata genotypes bearing mutation(s) in the cytochrome b gene ( Cyto b ). The aim of the present study was: (1) to demonstrate whether there is an association between mutations in the T . annulata Cyto b gene and selection of parasite-infected cells resistant to buparvaquone and (2) to determine the frequency of these mutations in parasites derived from infected cattle in the Aydın region of Türkiye. Susceptibility to buparvaquone was assessed by comparing the proliferative index of schizont-infected cells obtained from cattle with theileriosis before and/or after treatment with various doses of buparvaquone, using the 3-(4,5-dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) colourimetric assay. The DNA sequence of the parasite Cyto b gene from cell lines identified as resistant or susceptible was determined. A total of six nonsynonymous and six synonymous mutations were identified. Two of the nonsynonymous mutations resulted in the substitutions V135A and P253S which are located at the putative buparvaquone binding regions of cytochrome b. Allele-specific PCR (AS-PCR) analyses detected the V135A and P253S mutations at a frequency of 3.90% and 3.57% respectively in a regional study population and revealed an increase in the frequency of both mutations over the years. The A53P mutation of TaPIN1 of T . annulata , previously suggested as being involved in buparvaquone resistance, was not detected in any of the clonal cell lines examined in the present study. The observed data strongly suggested that the genetic mutations resulting in V135A and P253S detected at the putative binding sites of buparvaquone in cytochrome b play a significant role in conferring, and promoting selection of, T . annulata genotypes resistant to buparvaquone, whereas the role of mutations in TaPIN1 is more equivocal." @default.
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• W4313485091 date "2023-01-04" @default.
• W4313485091 modified "2023-09-27" @default.
• W4313485091 title "Selection of genotypes harbouring mutations in the cytochrome b gene of Theileria annulata is associated with resistance to buparvaquone" @default.
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• W4313485091 doi "https://doi.org/10.1371/journal.pone.0279925" @default.
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