Transcriptome analysis of interactions between silkworm and cytoplasmic polyhedrosis virus

Area of Science:

• Virology
• Insect Pathology
• Molecular Biology

Background:

• Bombyx mori cytoplasmic polyhedrosis virus (BmCPV) is a significant pathogen affecting silkworms, primarily targeting the midgut.
• Viral replication is concentrated in the posterior midgut, but the molecular mechanisms of infection and host response are not fully elucidated.

Purpose of the Study:

• To investigate the transcriptomic changes in silkworm midgut and fat body following BmCPV infection.
• To identify host genes involved in BmCPV invasion, replication, and immune defense.

Main Methods:

• Comparative transcriptomic analysis of silkworm midgut and fat body tissues at different time points post-BmCPV infection.
• High-throughput sequencing and data analysis to identify differentially expressed genes and pathways.

Main Results:

• Upregulation of numerous transcripts in the midgut during BmCPV infection.
• Identification of specific midgut genes with transmembrane transport functions induced by BmCPV, potentially mediating viral entry and proliferation.
• Upregulation of antioxidant genes in the fat body, contrasting with the midgut response.
• Induction of BmPGRP-S2 and a putative serine protease, suggesting a role in antiviral immunity.
• Differential expression patterns of BmCPV structural protein genes.

Conclusions:

• The study elucidates key host genes and pathways involved in BmCPV infection dynamics.
• Identified genes like BGI009201 are crucial for viral proliferation in the posterior midgut.
• BmPGRP-S2 and serine proteases play a role in the silkworm's immune defense against BmCPV.