Spiroplasma impairs testes gene expression in Glossina fuscipes fuscipes

Area of Science:

• Entomology
• Microbiology
• Genetics

Background:

• Glossina fuscipes fuscipes is a key vector for human and animal trypanosomiasis in Sub-Saharan Africa.
• Controlling tsetse fly populations is vital due to the disease's socio-economic impact and limited treatment options.
• Spiroplasma's presence in G. f. fuscipes offers potential for novel control strategies, possibly by conferring refractoriness to Trypanosoma infections.

Purpose of the Study:

• To investigate the impact of Spiroplasma infection on the reproductive fitness of male Glossina fuscipes fuscipes.
• To identify specific molecular pathways affected by Spiroplasma in male tsetse flies.

Main Methods:

• Differential gene expression analysis was performed on testes and male accessory glands (MAGs) of Spiroplasma-infected and uninfected male G. f. fuscipes.
• Analysis focused on identifying genes with altered expression levels in response to Spiroplasma infection.

Main Results:

• A significant downregulation of genes was observed in the testes of infected males.
• Genes related to sperm motility, energy metabolism, and mitochondrial function were notably downregulated in testes.
• Male accessory glands showed a less pronounced effect, with differentially expressed genes involved in antimicrobial activity and circadian rhythm regulation.

Conclusions:

• Spiroplasma infection imposes potential fitness costs on male G. f. fuscipes, particularly affecting testicular functions.
• Understanding these molecular impacts is essential for evaluating the feasibility and potential consequences of using Spiroplasma as a biological control agent against tsetse flies.