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Preparation of Mycobacterium Tuberculosis Culture Filtrate to Understand TB Pathogenesis
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Redefining genetic essentiality in Mycobacterium tuberculosis.

Saniya Patil1, Aseem Palande1, Tejan Lodhiya1

  • 1Department of Biology, Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati 517507, India.

Gene
|September 8, 2020
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Summary

Investigating Mycobacterium tuberculosis mutant libraries revealed that gene essentiality can change during growth without selection. Genes involved in adaptation and toxin-antitoxin systems showed dynamic insertion patterns, highlighting new insights into bacterial gene function.

Keywords:
Essential genesGrowth defectMycobacterium tuberculosisTnSeqTransposon

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Area of Science:

  • Microbiology
  • Genomics
  • Bacterial Genetics

Background:

  • Transposon sequencing is crucial for identifying essential and non-essential genes in bacteria.
  • Mycobacterium tuberculosis has a significant portion of its genome with unknown functions.
  • The impact of optimal growth conditions on gene essentiality in M. tuberculosis is not well understood.

Purpose of the Study:

  • To investigate dynamic changes in gene essentiality in a high-density Mycobacterium tuberculosis mutant library under non-selective growth conditions.
  • To identify genes and pathways that exhibit fluctuating essentiality states.
  • To report the essentiality status of newly annotated genetic features.

Main Methods:

  • Generation of a high-density transposon mutant library of M. tuberculosis.
  • Serial culturing of the mutant library under nutrient-rich conditions.
  • Monitoring temporal fluctuations in transposon insertion frequencies across the genome.

Main Results:

  • Genes related to morphological/physiological heterogeneity and metabolic bypass gradually lost insertions.
  • Genes encoding toxin-antitoxin systems showed enrichment of insertions.
  • Significant fluctuations in insertion frequencies were observed in genes involved in cell wall/processes, intermediary metabolism, and virulence.

Conclusions:

  • Gene essentiality in M. tuberculosis is dynamic and can change based on growth conditions, even without selection pressure.
  • Mutant adaptation involves dynamic changes in genes related to cellular processes, metabolism, and virulence.
  • This study provides essentiality data for several newly annotated genetic features in M. tuberculosis.