Molecular Detection and Characterization of p44/msp2 Multigene Family of Anaplasma phagocytophilum from Haemaphysalis longicornis in Mie Prefecture, Japan

Japanese journal of infectious diseases

Eri Onoda¹  Shigetoshi Sakabe²  Hongru Su³  Ayaka Sato⁴  Hiromi Fujita⁵ 

[1] Department of Medicine and Infectious Disease, Ise Red Cross Hospital;Department of Microbiology, Shizuoka Institute of Environment and Hygiene;Laboratory of Microbiology, Graduate Program in Pharmaceutical and Nutritional Sciences, Integrated Graduate School of Pharmaceutical and Nutritional Sciences, University of Shizuoka;Mahara Institute of Medical Acarology;Mie Prefecture Health and Environment Research Institute

关键词: Anaplasma phagocytophilum;    Human granulocytic anaplasmosis;    Haemaphysalis longicornis;    p44/msp2;    multigene family;   

DOI  :  10.7883/yoken.JJID.2018.485

学科分类：传染病学

来源: National Institute of Infectious Diseases

【 摘 要 】

Anaplasma phagocytophilum is an obligate intracellular bacterium that causes human granulocytic anaplasmosis (HGA), an emerging tick-borne infectious disease. This bacterium expresses various 44-kDa major outer membrane proteins encoded by the p44/msp2 multigene family to avoid the host immune system. We previously detected A. phagocytophilum p44/msp2 from the tick Haemaphysalis longicornis in Mie Prefecture, Japan in 2008. In this study, we further investigated a total of 483 H. longicornis ticks (220 adults and 263 nymphs) collected from the Mie Prefecture by PCR targeting p44/msp2 to characterize the p44/msp2 multigene family of A. phagocytophilum. Six of the 483 ticks tested were PCR-positive for A. phagocytophilum p44/msp2, and these positive individuals were at the nymph stage of the tick life cycle. Cloning, sequencing, and phylogenetic analyses of the amplicons revealed that the 11 p44/msp2 clones obtained from the positive ticks shared a 54.9%–99.3% amino acid sequence similarity with the 27 previously identified clones from HGA patients in Japan. In particular, 6 p44/msp2 clones displayed the highest similarities (97.2%–99.3%) with 3 previously identified clones (FJ417343, FJ417345, FJ417357). Thus, the data from this study provide important public health information regarding A. phagocytophilum infection transmitted by H. longicornis ticks, especially at the nymph stage.

【 授权许可】

Unknown