Conservation of core gene expression in vertebrate tissues

Esther T. Chan, Gerald Quon, Gordon Chua, Tomas Babak, Miles Trochesset, Ralph A. Zirngibl, Jane Aubin, Michael J.H. Ratcliffe, Andrew Wilde, Michael Brudno, Quaid D. Morris, Timothy R. Hughes

Research output: Contribution to journalArticle

105 Scopus citations

Abstract

Background. Vertebrates share the same general body plan and organs, possess related sets of genes, and rely on similar physiological mechanisms, yet show great diversity in morphology, habitat and behavior. Alteration of gene regulation is thought to be a major mechanism in phenotypic variation and evolution, but relatively little is known about the broad patterns of conservation in gene expression in non-mammalian vertebrates. Results. We measured expression of all known and predicted genes across twenty tissues in chicken, frog and pufferfish. By combining the results with human and mouse data and considering only ten common tissues, we have found evidence of conserved expression for more than a third of unique orthologous genes. We find that, on average, transcription factor gene expression is neither more nor less conserved than that of other genes. Strikingly, conservation of expression correlates poorly with the amount of conserved nonexonic sequence, even using a sequence alignment technique that accounts for non-collinearity in conserved elements. Many genes show conserved human/fish expression despite having almost no nonexonic conserved primary sequence. Conclusions. There are clearly strong evolutionary constraints on tissue-specific gene expression. A major challenge will be to understand the precise mechanisms by which many gene expression patterns remain similar despite extensive cis-regulatory restructuring.

Original languageEnglish (US)
Article number33
JournalJournal of Biology
Volume8
Issue number3
DOIs
StatePublished - May 5 2009
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

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    Chan, E. T., Quon, G., Chua, G., Babak, T., Trochesset, M., Zirngibl, R. A., Aubin, J., Ratcliffe, M. J. H., Wilde, A., Brudno, M., Morris, Q. D., & Hughes, T. R. (2009). Conservation of core gene expression in vertebrate tissues. Journal of Biology, 8(3), [33]. https://doi.org/10.1186/jbiol130