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Zheng W, Umemiya-Shirafuji R, Chen S, Okado K, Adjou Moumouni PF, Suzuki H, Yang S, Liu M, Xuan X. Identification of Haemaphysalis longicornis Genes Differentially Expressed in Response to Babesia microti Infection. Pathogens 2020; 9:E378. [PMID: 32423088 PMCID: PMC7281432 DOI: 10.3390/pathogens9050378] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/02/2020] [Accepted: 05/12/2020] [Indexed: 12/31/2022] Open
Abstract
Haemaphysalis longicornis is a tick and a vector of various pathogens, including the human pathogenetic Babesia microti. The objective of this study was to identify female H. longicornis genes differentially expressed in response to infection with B. microti Gray strain by using a suppression subtractive hybridization (SSH) procedure. A total of 302 randomly selected clones were sequenced and analyzed in the forward subtracted SSH cDNA library related to Babesia infection, and 110 clones in the reverse cDNA library. Gene ontology assignments and sequence analyses of tick sequences in the forward cDNA library showed that 14 genes were related to response to stimulus or/and immune system process, and 7 genes had the higher number of standardized sequences per kilobase (SPK). Subsequent real-time PCR detection showed that eight genes including those encoding for Obg-like ATPase 1 (ola1), Calreticulin (crt), vitellogenin 1 (Vg1) and Vg2 were up-regulated in fed ticks. Compared to uninfected ticks, infected ticks had six up-regulated genes, including ola1, crt and Vg2. Functional analysis of up-regulated genes in fed or Babesia-infected ticks by RNA interference showed that knockdown of crt and Vg2 in infected ticks and knockdown of ola1 in uninfected ticks accelerated engorgement. In contrast, Vg1 knockdown in infected ticks had delayed engorgement. Knockdown of crt and Vg1 in infected ticks decreased engorged female weight. Vg2 knockdown reduced B. microti infection levels by 51% when compared with controls. The results reported here increase our understanding of roles of H. longicornis genes in blood feeding and B. microti infection.
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Affiliation(s)
- Weiqing Zheng
- The Collaboration Unit for Field Epidemiology of State Key Laboratory for Infectious Disease Prevention and Control, Jiangxi Provincial key Laboratory of Animal-Origin and Vector-Borne Diseases, Nanchang Center for Disease Control and Prevention, Honggutan New District, Nanchang 330038, China; (W.Z.); (S.C.)
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-Cho, Obihiro, Hokkaido 080-8555, Japan; (K.O.); (P.F.A.M.); (H.S.); (M.L.)
| | - Rika Umemiya-Shirafuji
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-Cho, Obihiro, Hokkaido 080-8555, Japan; (K.O.); (P.F.A.M.); (H.S.); (M.L.)
| | - Shengen Chen
- The Collaboration Unit for Field Epidemiology of State Key Laboratory for Infectious Disease Prevention and Control, Jiangxi Provincial key Laboratory of Animal-Origin and Vector-Borne Diseases, Nanchang Center for Disease Control and Prevention, Honggutan New District, Nanchang 330038, China; (W.Z.); (S.C.)
| | - Kiyoshi Okado
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-Cho, Obihiro, Hokkaido 080-8555, Japan; (K.O.); (P.F.A.M.); (H.S.); (M.L.)
| | - Paul Franck Adjou Moumouni
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-Cho, Obihiro, Hokkaido 080-8555, Japan; (K.O.); (P.F.A.M.); (H.S.); (M.L.)
| | - Hiroshi Suzuki
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-Cho, Obihiro, Hokkaido 080-8555, Japan; (K.O.); (P.F.A.M.); (H.S.); (M.L.)
| | - Shu Yang
- The Collaboration Unit for Field Epidemiology of State Key Laboratory for Infectious Disease Prevention and Control, Jiangxi Provincial key Laboratory of Animal-Origin and Vector-Borne Diseases, Nanchang Center for Disease Control and Prevention, Honggutan New District, Nanchang 330038, China; (W.Z.); (S.C.)
| | - Mingming Liu
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-Cho, Obihiro, Hokkaido 080-8555, Japan; (K.O.); (P.F.A.M.); (H.S.); (M.L.)
| | - Xuenan Xuan
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-Cho, Obihiro, Hokkaido 080-8555, Japan; (K.O.); (P.F.A.M.); (H.S.); (M.L.)
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