Genomic analysis of the relationship between gene expression variation and DNA polymorphism in Drosophila simulans Public Deposited

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  • Lawniczak, Mara KN
    • Other Affiliation: Division of Cell and Molecular Biology, Imperial College London, London, SW7 2AZ, UK
  • Begun, David J
    • Other Affiliation: Department of Evolution and Ecology and Center for Population Biology, University of California, Shields Avenue, Davis, CA 95616, USA
  • Holloway, Alisha K
    • Other Affiliation: Department of Evolution and Ecology and Center for Population Biology, University of California, Shields Avenue, Davis, CA 95616, USA
  • Jones, Corbin
    • Affiliation: College of Arts and Sciences, Department of Biology, School of Medicine, Carolina Center for Genome Sciences
  • Abstract Background Understanding how DNA sequence polymorphism relates to variation in gene expression is essential to connecting genotypic differences with phenotypic differences among individuals. Addressing this question requires linking population genomic data with gene expression variation. Results Using whole genome expression data and recent light shotgun genome sequencing of six Drosophila simulans genotypes, we assessed the relationship between expression variation in males and females and nucleotide polymorphism across thousands of loci. By examining sequence polymorphism in gene features, such as untranslated regions and introns, we find that genes showing greater variation in gene expression between genotypes also have higher levels of sequence polymorphism in many gene features. Accordingly, X-linked genes, which have lower sequence polymorphism levels than autosomal genes, also show less expression variation than autosomal genes. We also find that sex-specifically expressed genes show higher local levels of polymorphism and divergence than both sex-biased and unbiased genes, and that they appear to have simpler regulatory regions. Conclusion The gene-feature-based analyses and the X-to-autosome comparisons suggest that sequence polymorphism in cis-acting elements is an important determinant of expression variation. However, this relationship varies among the different categories of sex-biased expression, and trans factors might contribute more to male-specific gene expression than cis effects. Our analysis of sex-specific gene expression also shows that female-specific genes have been overlooked in analyses that only point to male-biased genes as having unusual patterns of evolution and that studies of sexually dimorphic traits need to recognize that the relationship between genetic and expression variation at these traits is different from the genome as a whole.
Date of publication
  • 18700012
  • doi:10.1186/gb-2008-9-8-r125
Resource type
  • Article
Rights statement
  • In Copyright
Rights holder
  • Mara KN Lawniczak et al.; licensee BioMed Central Ltd.
Journal title
  • Genome Biology
Journal volume
  • 9
Journal issue
  • 8
Page start
  • R125
  • English
Is the article or chapter peer-reviewed?
  • Yes
  • 1465-6906
Bibliographic citation
  • Genome Biology. 2008 Aug 12;9(8):R125
  • Open Access
  • BioMed Central Ltd

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