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Genotype to phenotype: a complex problem.

Robin D Dowell1, Owen Ryan, An Jansen

  • 1Computer Science and Artificial Intelligence Laboratory, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.

Science (New York, N.Y.)
|April 24, 2010
PubMed
Summary
This summary is machine-generated.

Comparing two yeast strains revealed conditionally essential genes, highlighting how genetic background and complex interactions influence traits, similar to human variation.

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Area of Science:

  • Genomics
  • Yeast genetics
  • Comparative genomics

Background:

  • Saccharomyces cerevisiae strains Sigma1278b and S288c exhibit significant genetic variation, analogous to human genetic diversity.
  • Understanding strain-specific gene essentiality is crucial for deciphering phenotypic differences.

Purpose of the Study:

  • To generate a high-resolution genome sequence of the Sigma1278b yeast strain.
  • To identify genes essential in one strain but not the other through a genome-wide deletion analysis.
  • To investigate the genetic basis of conditional gene essentiality.

Main Methods:

  • High-resolution whole-genome sequencing of Saccharomyces cerevisiae Sigma1278b.
  • Construction and phenotypic analysis of a library of 5100 single-gene deletion mutants in Sigma1278b.
  • Comparative genome-wide analysis of deletion mutant phenotypes between Sigma1278b and S288c.

Main Results:

  • Sigma1278b and S288c differ by an average of 3.2 single-nucleotide polymorphisms per kilobase.
  • Identified 44 essential genes unique to Sigma1278b and 13 essential genes unique to S288c.
  • Strain-specific essentiality was frequently attributed to complex genetic interactions involving multiple background-specific modifiers.

Conclusions:

  • Phenotypic variation between individuals, even closely related ones, can arise from complex genetic interactions and background-specific modifiers.
  • This study provides a valuable genomic resource for Saccharomyces cerevisiae research.
  • The findings underscore the importance of genetic background in determining gene function and essentiality.