Journal
JOURNAL OF VETERINARY MEDICAL SCIENCE
Volume 82, Issue 11, Pages 1700-1703Publisher
JAPAN SOC VET SCI
DOI: 10.1292/jvms.20-0382
Keywords
allele-specific real-time PCR; Babesia gibsoni; drug resistance; M121I variant population
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A single-nucleotide polymorphism causing the replacement of methionine with isoleucine (M121I) in cytochrome b of Babesia gibsoni has been reported to reduce the susceptibility to atovaquone (ATV) in B. gibsoni infection. In our previous study, B. gibsoni with M121I was suggested to exist in nature. Thus, further examinations were performed. In total, 105 genomic DNA samples from B. gibsoni-infected dogs were collected from western (98 samples from 15 prefectures) and eastern areas (7 samples from 4 prefectures) in Japan. The M121I variant population was identified using allele-specific real-time PCR: it was then detected in nine samples (8.57%), which was higher than that in the previous study (4.11%). Although there are unclear points, such as the history of ATV usage, careful attention should be given to emerging ATV resistance.
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