Transcriptome analysis of perforated small cocoon from Bombyx mori mutants

Area of Science:

• Genomics
• Molecular Biology
• Developmental Biology

Background:

• Silkworm growth and development are significantly influenced by the metabolism of essential substances like amino acids and carbohydrates.
• Understanding the genetic basis of developmental abnormalities is crucial for silkworm breeding and research.

Purpose of the Study:

• To investigate the molecular mechanisms underlying the abnormal development of the silkworm mutant perforated small cocoon (psc).
• To identify differentially expressed genes (DEGs) involved in metabolic pathways in the psc mutant compared to the wild-type.

Main Methods:

• Transcriptome analysis using RNA sequencing was performed on the psc mutant and the wild-type XueSong KD (XSKD) silkworms at the third-instar larval stage.
• Differentially expressed genes were identified and functionally annotated using the KEGG database.
• Quantitative real-time PCR (qRT-PCR) was used to validate the expression levels of selected DEGs.

Main Results:

• A total of 716 DEGs were identified, with 354 upregulated and 362 downregulated in the psc mutant.
• Enrichment analysis revealed that DEGs were predominantly associated with metabolic pathways of amino acids, carbohydrates, and lipids, as well as neuroactive ligand-receptor interactions.
• Key enzyme genes in substance metabolism and neuroreceptor genes were found to be crucial for the formation of the psc phenotype.

Conclusions:

• The study elucidates the molecular basis of abnormal development in the psc silkworm mutant, highlighting the role of disrupted metabolic and neuroactive ligand-receptor interaction pathways.
• The identified DEGs provide valuable targets for understanding silkworm development and offer potential guidance for breeding improved silkworm varieties.