Study Challenges Classic Bacterial Gene Model

• 03 Apr 2026

In April 2026, scientists at the Bose Institute have challenged a long-standing model of bacterial gene regulation, offering new insights that could aid the fight against Tuberculosis and drug-resistant infections.

Key Points

• Background:
  • Tuberculosis is a major global health concern, especially with rising drug resistance.
  • Caused by Mycobacterium tuberculosis.
• Traditional Theory (σ-cycle):
  • Sigma (σ) factor binds to RNA polymerase to start transcription.
  • Detaches once elongation begins.
  • Considered universal across bacteria.
• New Discovery:
  • σ-cycle is not universal in all bacteria.
  • Different sigma factors behave differently during gene expression.
• Key Findings:
  • σA and σE detach during transcription.
  • σF remains bound throughout the process.
  • Indicates multiple regulatory mechanisms in TB bacteria.
• Scientific Implication:
  • Reveals a new survival strategy used by TB bacteria under stress.
  • Suggests bacteria use flexible gene regulation rather than a single model.
• Drug Development Potential:
  • Opens new targets beyond enzyme active sites.
  • Focus on disrupting protein interactions to combat drug resistance.