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Identification and Differential Gene Expression of Adhesin-Like Wall Proteins in Candida glabrata Biofilms

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Abstract

An important initial step in biofilm development and subsequent establishment of fungal infections by the human pathogen Candida glabrata is adherence to a surface. Adherence is mediated through a large number of differentially regulated cell wall-bound adhesins. The fungus can modify the incorporation of adhesins in the cell wall allowing crucial adaptations to new environments. In this study, expression and cell wall incorporation of C. glabrata adhesins were evaluated in biofilms cultured in two different media: YPD and a semi-defined medium SdmYg. Tandem mass spectrometry of isolated C. glabrata cell walls identified 22 proteins including six adhesins: the novel adhesins Awp5 and Awp6, Epa3 and the previously identified adhesins Epa6, Awp2 and Awp4. Regulation of expression of these and other relevant adhesin genes was investigated using real-time qPCR analysis. For most adhesin genes, significant up-regulation was observed in biofilms in at least one of the culturing media. However, this was not the case for EPA6 and AWP2, which is consistent with their gene products already being abundantly present in planktonic cultures grown in YPD medium. Furthermore, most of the adhesin genes tested also show medium-dependent differential regulation. These results underline the idea that many adhesins in C. glabrata are involved in biofilm formation and that their expression is tightly regulated and dependent on environmental conditions and growth phase. This may contribute to its potential to form resilient biofilms and cause infection in various host tissues.

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Abbreviations

GPI:

Glycosylphosphatidylinositol

NA:

Nicotinic acid

PBS:

Phosphate buffered saline

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Acknowledgments

PG was supported by an INCRECyT fellowship from Parque Científico y Tecnológico de Albacete.

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Authors and Affiliations

  1. Department of Preventive Dentistry, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University Amsterdam, Gustav Mahlerlaan 3004, 1081 LA, Amsterdam, The Netherlands

    E. A. Kraneveld, J. J. de Soet, D. M. Deng & W. Crielaard

  2. Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands

    H. L. Dekker, C. G. de Koster, F. M. Klis & P. W. J. de Groot

  3. Regional Center for Biomedical Research, Albacete Science and Technology Park, University of Castilla—La Mancha, 02006, Albacete, Spain

    P. W. J. de Groot

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  1. E. A. Kraneveld
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Correspondence to E. A. Kraneveld.

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Kraneveld, E.A., de Soet, J.J., Deng, D.M. et al. Identification and Differential Gene Expression of Adhesin-Like Wall Proteins in Candida glabrata Biofilms. Mycopathologia 172, 415–427 (2011). https://doi.org/10.1007/s11046-011-9446-2

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  • DOI: https://doi.org/10.1007/s11046-011-9446-2

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