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Open Access Methodology article

A toolbox for epitope-tagging and genome-wide location analysis in Candida albicans

Hugo Lavoie12, Adnane Sellam13, Christopher Askew12, André Nantel13 and Malcolm Whiteway12*

Author Affiliations

1 Biotechnology Research Institute, National Research Council, Montreal, Quebec, H4P 2R2, Canada

2 Department of Biology, McGill University, Montreal, Quebec, H3A 1B1, Canada

3 Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, H3A 1B1, Canada

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BMC Genomics 2008, 9:578  doi:10.1186/1471-2164-9-578

Published: 2 December 2008

Abstract

Background

Candida albicans is a diploid pathogenic fungus not yet amenable to routine genetic investigations. Understanding aspects of the regulation of its biological functions and the assembly of its protein complexes would lead to further insight into the biology of this common disease-causing microbial agent.

Results

We have developed a toolbox allowing in vivo protein tagging by PCR-mediated homologous recombination with TAP, HA and MYC tags. The transformation cassettes were designed to accommodate a common set of integration primers. The tagged proteins can be used to perform tandem affinity purification (TAP) or chromatin immunoprecipitation coupled with microarray analysis (ChIP-CHIP). Tandem affinity purification of C. albicans Nop1 revealed the high conservation of the small processome composition in yeasts. Data obtained with in vivo TAP-tagged Tbf1, Cbf1 and Mcm1 recapitulates previously published genome-wide location profiling by ChIP-CHIP. We also designed a new reporter system for in vivo analysis of transcriptional activity of gene loci in C. albicans.

Conclusion

This toolbox provides a basic setup to perform purification of protein complexes and increase the number of annotated transcriptional regulators and genetic circuits in C. albicans.