Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Quantifiable Downregulation of Endogenous Genes in Agaricus bisporus Mediated by Expression of RNA Hairpins

  • Costa, Ana S.M.B. (Warwick HRI, University of Warwick) ;
  • Thomas, D. John I. (Warwick HRI, University of Warwick) ;
  • Eastwood, Daniel (Warwick HRI, University of Warwick) ;
  • Cutler, Simon B. (Warwick HRI, University of Warwick) ;
  • Bailey, Andy M. (School of Biological Sciences, University of Bristol) ;
  • Foster, Gary D. (School of Biological Sciences, University of Bristol) ;
  • Mills, Peter R. (Warwick HRI, University of Warwick) ;
  • Challen, Michael P. (Warwick HRI, University of Warwick)
  • Received : 2008.06.27
  • Accepted : 2008.08.07
  • Published : 2009.03.31
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Abstract

Functional gene studies in the cultivated white button mushroom Agaricus bisporus have been constrained by the absence of effective gene-silencing tools. Using two endogenous genes from A. bisporus, we have tested the utility of dsRNA hairpin constructs to mediate downregulation of specific genes. Hairpin constructs for genes encoding orotidine 5'-monophosphate decarboxylase (URA3) and carboxin resistance (CBX) were introduced into A. bisporus using Agrobacteriummediated transfection. Although predicted changes in phenotype were not observed in vitro, quantitative-PCR analyses indicated unambiguously that transcripts in several transformants were substantially reduced compared with the non-transformed controls. Interestingly, some hairpin transformants exhibited increased transcription of target genes. Our observations show that hairpin transgenic sequences can mediate downregulation of A. bisporus endogenous genes and that the technology has the potential to expedite functional genomics of the mushroom.

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References

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