02435nas a2200277   4500008004100000245012900041210006900170260000800239300001300247490000700260520148800267100001901755700002101774700001701795700002401812700002501836700001901861700002101880700001801901700002001919700002201939700002701961700001801988700002802006856012302034       2025                        eng d00aIdentification of genetic variations linked to buparvaquone resistance in Theileria annulata infecting dairy cattle in India0 aIdentification of genetic variations linked to buparvaquone resi  cJUL  ae03262430 v203 a<p>
	Buparvaquone (BPQ) is used for the treatment of bovine theileriosis, a tickborne disease caused by parasites of the Theileria genus. Studies on T. annulata have linked the mechanism of BPQ resistance predominantly to genetic variations in the parasite cytochrome b (cytb) gene. In addition, cryptic mechanisms of resistance involving the parasite peptidyl-prolyl isomerase (pin1) and dihydroorotate dehydrogenase (dhodh) genes require assessment. In India, where bovine theileriosis is endemic, and BPQ is widely used for treatment, it is necessary to establish the prevalence of genetic variations linked to BPQ resistance. In this study, multiplexed PCR amplification and nanopore sequencing method was used for genotyping the complete gene loci of the three target genes. Analysis of 454 T. annulata field samples collected from seven different states of India revealed the presence of previously reported BPQ resistance associated variations S129G, A146T and P253S in cytb gene and A53P in pin1 gene. The A146T and I203V variations in cytb were found to be prevalent and mostly co-occurring, and their role in BPQ resistance needs further evaluation. This study has revealed the presence of previously reported BPQ resistance-linked mutations in cytb and pin1 genes in T. annulata infecting dairy cattle in India and establishes an Oxford nanopore sequencing method suitable for large-scale surveillance of genetic variation in Theileria parasites from field samples.</p>
1 aMusale, Pankaj1 aKhilari, Ajinkya1 aGade, Rohini1 aDhanikachalam, Velu1 aJadhav, Santoshkumar1 aBajpai, Manali1 aTurakani, Bhagya1 aJoshi, Akshay1 aPrajapati, Amar1 aSrivastava, Anand1 aSwaminathan, Marimuthu1 aJoshi, Sachin1 aShanmugam, Dhanasekaran  uhttps://library.ncl.res.in/content/identification-genetic-variations-linked-buparvaquone-resistance-theileria-annulata