Time-Course Transcriptome Analysis of Bacillus subtilis DB104 during Growth.

Area of Science:

• Microbiology
• Molecular Biology
• Biotechnology

Background:

• Bacillus subtilis DB104 is crucial for recombinant protein expression.
• Understanding gene expression dynamics is vital for optimizing bacterial strain commercialization.
• Transcriptome and proteome analyses are key for studying microbial genomic responses.

Purpose of the Study:

• To monitor gene expression changes in Bacillus subtilis DB104 during growth on complete medium.
• To identify and categorize differentially expressed genes (DEGs) based on expression patterns.
• To elucidate the relationship between gene expression, sporulation, and sigma factor function.

Main Methods:

• Transcriptome analysis of Bacillus subtilis DB104.
• Utilized KEGG pathway analysis, K-mean clustering, and Gene Ontology (GO) enrichment analysis.
• Investigated the role of sigma factors in gene regulation.

Main Results:

• 2122 DEGs were identified and clustered into 10 groups based on expression patterns.
• ABC transporter genes were downregulated during exponential growth.
• Metabolic shifts, stress responses, and lipid catabolism were observed, linked to sporulation initiation and programmed cell death.

Conclusions:

• Gene expression changes in Bacillus subtilis DB104 are significantly influenced by sporulation initiation.
• Sigma factors play a specific role in regulating the timing of spore coat gene expression.
• This research provides a comprehensive view of transcriptional regulation in Bacillus subtilis during growth.