title: Variable sexually dimorphic gene expression in laboratory strains of Drosophila melanogaster.
abstract: BACKGROUND
  Wild-type laboratory strains of model organisms are typically kept in isolation for many years, with the action of genetic drift and selection on mutational variation causing lineages to diverge with time. Natural populations from which such strains are established, show that gender-specific interactions in particular drive many aspects of sequence level and transcriptional level variation. Here, our goal was to identify genes that display transcriptional variation between laboratory strains of Drosophila melanogaster, and to explore evidence of gender-biased interactions underlying that variability.
  
  
  RESULTS
  Transcriptional variation among the laboratory genotypes studied occurs more frequently in males than in females. Qualitative differences are also apparent to suggest that genes within particular functional classes disproportionately display variation in gene expression. Our analysis indicates that genes with reproductive functions are most often divergent between genotypes in both sexes, however a large proportion of female variation can also be attributed to genes without expression in the ovaries.
  
  
  CONCLUSIONS
  The present study clearly shows that transcriptional variation between common laboratory strains of Drosophila can differ dramatically due to sexual dimorphism. Much of this variation reflects sex-specific challenges associated with divergent physiological trade-offs, morphology and regulatory pathways operating within males and females.
authors: Department of Genetics, University of Cambridge, Downing Street, Cambridge CB1 3QA, UK. dab55@cam.ac.uk
authors: Dean A
authors: DA
authors: Baker
authors: Lisa A
authors: LA
authors: Meadows
authors: Jing
authors: J
authors: Wang
authors: Julian At
authors: JA
authors: Dow
authors: Steven
authors: S
authors: Russell
mesh_terms: D000818:Animals; D004331:Drosophila melanogaster / Q000235:genetics*; D005260:Female; D015870:Gene Expression; D020869:Gene Expression Profiling; D017344:Genes, Insect; D014644:Genetic Variation; D007753:Laboratories; D008297:Male; D008957:Models, Genetic; D012727:Sex Characteristics; D013223:Statistics as Topic; D014158:Transcription, Genetic