Theileria annulata (T. annulata) is intra-erythrocytic protozoan parasite which is more prevalent in tropical and sub-tropical countries. It has a significant economic impact on the productivity of the dairy industry, and buparvaquone is used to treat infected animals in the prevalent regions of the world. Systematically, buparvaquone targets the cyto-b gene to break the electron transport chain (ETC) and Theileria annulata peptidyl-prolyl isomerase 1 (TaPIN1) gene to destabilize transcription factor JUN (c-JUN) to inhibit proliferation of infected cells, which ultimately leads to the death of T. annulata. The reported studies on drug resistance is due to inappropriate drug application, evolutionary characteristics of the cytochrome b (cyto-b) gene and oncogenic signaling pathways gene (TaPIN1) make the parasite resistant against buparvaquone. Hence, this systematic review was designed to find out non-synonymous mutation in genes (cyto-b and TaPIN1) responsible for drug resistance reported from Tunisia, Turkey, Egypt, Sudan, Iran, Pakistan, China and Germany with reference to the T. annulata Ankara strain of cyto-b (accession no. XM_949625.1) and TaPIN1 (accession no. TA18945) wild type genes. Non-synonymous point mutations were found in cyto-b (Q01 at 130-148 and Q02 at 253-262 regions) and TaPIN1 (A53P and A53T) genes. These point mutations are responsible for developing buparvaquone resistance against T. annulata infection. These genes can be used as biomarkers for the identification of drug resistance in any endemic area. To avoid the complication of drug resistance, development of genetically resistant cattle breeds, potent vaccines and anti-theilerial drugs (Trifloxystrobin and anti-cancerous) are currently required to control proliferating economically important T. annulata parasites.
Keywords: Buparvaquone; Cytochrome b; Drug resistance; Peptidyl-prolyl isomerase 1; Theileria annulata.
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