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Phylogenetic analysis of basic helix-loop-helix transcription factors in the genome of a typical human-disease vector.

Ixodes scapularis, the black-legged tick, is one of the most common human-disease vectors and transmits Borrelia species, such as B. burgdorferi, as well as Theileria microti, Anaplasma phagocytophilum, etc. As basic helix-loop-helix (bHLH) transcription factors have been recognized for many years as important regulators of various developmental processes, we performed phylogenetic analysis of the black-legged tick genome in order to identify the number and family of bHLH transcription factors. Because bHLH family members have been identified in many organisms, including silkworm and fruit fly, we were able to conduct this survey and identify 58 putative bHLH transcription factors. Phylogenetic analysis revealed that the black-legged tick has 26, 10, 9, 1, 9, and 1 member in groups A, B, C, D, E, and F, respectively, whereas two were orphan genes. This analysis also revealed that unlike silkworm and fruit fly, the black-legged tick has no Mesp, Mlx, or TF4 family members, but has one more MyoRb family member. The present study provides useful background information for future studies of the black-legged tick as a disease vector with the goal of prevention and treatment.

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