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Related Experiment Videos

Genome-wide screening for trait conferring genes using DNA microarrays.

R T Gill1, S Wildt, Y T Yang

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 9, 2002
PubMed
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This study introduces a DNA microarray method to identify genes conferring specific cellular traits. The functional genomics approach maps genes to traits by enriching transformants and using microarrays to identify gene inserts, advancing trait discovery.

Area of Science:

  • Functional genomics
  • Molecular biology
  • Genetics

Background:

  • Transcriptional profiling identifies gene expression changes correlated with phenotypes.
  • A functional genomics approach is needed to directly link genes to specific cellular physiology.

Purpose of the Study:

  • To develop and demonstrate a DNA microarray-based method for genome-wide monitoring of transformants.
  • To identify genes whose overexpression confers specific cellular phenotypes, such as antimicrobial resistance.

Main Methods:

  • A parallel gene-trait mapping method involving transforming cells with a genomic library.
  • Enriching transformants with the desired trait and using DNA microarrays to identify enriched gene inserts.
  • Demonstrated using Escherichia coli and the antimicrobial agent Pine-Sol to identify genes conferring tolerance or sensitivity.

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Main Results:

  • Identified 19 genes conferring Pine-Sol tolerance and 27 genes conferring Pine-Sol sensitivity in E. coli.
  • Validated results through colony plating, sequencing, and assessing transformed cell resistance.
  • The method successfully identified genes linked to specific growth phenotypes.

Conclusions:

  • The developed DNA microarray method enables efficient genome-wide identification of genes associated with specific cellular traits.
  • This functional genomics approach has broad applications beyond antibiotic resistance, including drug resistance and industrial biotechnology.
  • The method provides a powerful tool for parallel gene-trait mapping and understanding gene function.