Transcriptome study reveals tick immune genes restrict Babesia microti infection

Area of Science:

• Systems biology
• Vector-pathogen interactions
• Tick immunology

Background:

• Haemaphysalis longicornis is a primary vector for Babesia microti, impacting human and animal health.
• Understanding tick-Babesia molecular interactions is vital for disease control and prevention strategies.

Purpose of the Study:

• To elucidate the molecular mechanisms underlying the interaction between Haemaphysalis longicornis ticks and Babesia microti.
• To identify potential vaccine targets for controlling tick infestations and pathogen transmission.

Main Methods:

• Systems biology approach using RNA sequencing to analyze gene expression in uninfected and B. microti-infected ticks.
• Identification and analysis of differentially expressed genes and key immune-related pathways (Toll, JAK-STAT, immunodeficiency, RNAi).
• RNA interference (RNAi) experiments to assess the role of Dorsal, Relish, and STAT genes in Babesia infection.

Main Results:

• 1,051 differentially expressed unigenes were identified, with 796 upregulated and 255 downregulated.
• Immune-related pathways, including Toll, JAK-STAT, immunodeficiency, and RNAi, were significantly modulated by B. microti infection.
• Knockdown of Dorsal, Relish, and STAT genes led to a significant increase in Babesia infection levels.

Conclusions:

• The study provides significant insights into the molecular interactions between Haemaphysalis longicornis and Babesia microti.
• Dorsal, Relish, and STAT are critical transcriptional factors involved in the tick's immune response to Babesia infection.
• Novel tick antigens identified in this study represent promising targets for developing vaccines against tick-borne diseases.