Expression pattern of subA in different tissues and blood-feeding status in Haemaphysalis flava

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• 作者：Lei Liu ; Tian-yin Cheng ; Fen Yan
• 关键词：Tick ; Subolesin ; SubA ; RACE ; Vaccine
• 刊名：Experimental and Applied Acarology
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：70
• 期：4
• 页码：511-522
• 全文大小：3,329 KB
• 刊物主题：Entomology; Animal Systematics/Taxonomy/Biogeography; Animal Genetics and Genomics; Animal Ecology; Life Sciences, general;
• 出版者：Springer Netherlands
• ISSN：1572-9702
• 卷排序：70

文摘

Tick-borne-diseases (TBD) pose a huge threat to the health of both humans and animals worldwide. Tick vaccines constitute an attractive alternative for tick control, due to their cost-efficiency and environmental-friendliness. Subolesin, a protective antigen against ticks, is reported to be a promising candidate for the development of broad-spectrum vaccines. However, the entire length of its gene, subA, and its gene expression pattern in different tissues and blood-feeding status (or different levels of engorgement) have not been studied extensively. In our study, the full-length of subA in Haemaphysalis flava, Rhipicephalus haemaphysaloides, Rhipicephalus microplus, and Dermacentor sinicus was cloned by RACE–PCR. The subA expression pattern was analyzed further in H. flava in different tissues and blood-feeding status by RT-PCR. We found that the full-length of subA in H. flava, R. haemaphysaloides, R. microplus, and D. sinicus was 1318, 1498, 1316, and 1769 bp, respectively, with encoded proteins at 180, 162, 162, and 166 aa in length, respectively. The primary structure of subolesin in H. flava included three conserved regions and two hypervariable regions, with no signal peptide. SubA expression in female H. flava of different blood-feeding status was in the order of the fasted < the 1/4-engorged < the half-engorged < the fully-engorged (p < 0.01). Tissue expression of subA was in the order of salivary gland > midgut > integument (p < 0.01), but its expression in salivary glands was not statistically different from that in ovaries. We concluded that subolesin was a conserved antigen and that subA was expressed differentially in H. flava in different tissues and blood-feeding status. Those features made subolesin feasible as a potential target antigen for development of a universal vaccine for the control of tick infestations and a reduction in TBD.