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Melanin production as a visual indicator of conjugal transfer in Streptomyces

Ting-Wen Chen1,2, Carton W Chen3

  • 1Department of Life Sciences and Institute of Genome Sciences, National Yang-Ming University, Taipei, 112, Taiwan.

Journal of Applied Genetics
|January 15, 2020
PubMed

Insights

Researchers developed a visual method to track plasmid transfer in Streptomyces conjugation. This technique uses a reporter system to quickly confirm successful DNA transfer between bacterial cells.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Conjugation is a key mechanism for horizontal gene transfer in bacteria, particularly in Streptomyces.
  • Monitoring plasmid transfer typically involves complex genetic or biochemical analyses.

Purpose of the Study:

  • To develop a simple, visual method for detecting plasmid transfer during Streptomyces conjugation.
  • To enable rapid assessment of conjugal gene transfer without laborious procedures.

Main Methods:

  • Constructed a conjugative plasmid containing the melC operon, encoding extracellular tyrosinase.
  • Introduced the plasmid into Streptomyces hosts lacking melC expression.
  • Co-cultured donor and plasmidless recipient strains on a solid medium with tyrosine.

Main Results:

  • Melanin production was observed within 8-9 hours of incubation, indicating successful plasmid transfer.
  • The visual detection of melanin confirmed the synthesis of tyrosinase in recipient cells.
  • This system provides a rapid, visual readout of conjugal transfer.

Conclusions:

  • The developed visual monitoring system offers a straightforward method for demonstrating plasmid transfer in Streptomyces.
  • This technique can be applied broadly across Streptomyces species and potentially for monitoring chromosome transfer.
Keywords:
ConjugationMelaninPlasmid transferStreptomycesTyrosinase

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