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Eukaryotic Cell, November 2007, p. 2112-2121, Vol. 6, No. 11
1535-9778/07/$08.00+0     doi:10.1128/EC.00199-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Roles of Candida albicans Sfl1 in Hyphal Development{triangledown}

Yandong Li, Chang Su, Xuming Mao, Fang Cao, and Jiangye Chen*

State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, SIBS, Chinese Academy of Sciences, 320 Yue Yang Road, Shanghai 200031, China

Received 5 June 2007/ Accepted 10 August 2007

The ability to switch between different morphological forms is an important feature of Candida albicans and is relevant to its pathogenesis. Many conserved positive and negative transcription factors are involved in morphogenetic regulation of the two dimorphic fungi Candida albicans and Saccharomyces cerevisiae. In S. cerevisiae, the transcriptional repressor Sfl1 and the activator Flo8 function antagonistically in invasive and filamentous growth. We have previously reported that Candida albicans Flo8 is a transcription factor essential for hyphal development and virulence in C. albicans. To determine whether a similar negative factor exists in C. albicans, we identified Candida albicans Sfl1 as a functional homolog of the S. cerevisiae sfl1 mutant. Sfl1 is a negative regulator of hyphal development in C. albicans. Deletion of C. albicans SFL1 enhanced filamentous growth and hypha-specific gene expression in several media and at several growth temperatures. Overexpression of the SFL1 led to a significant reduction of filament formation. Both deletion and overexpression of the SFL1 attenuated virulence of C. albicans in a mouse model. Deleting FLO8 in an sfl1/sfl1 mutant completely blocked hyphal development in various growth conditions examined, suggesting that C. albicans Sfl1 may act as a negative regulator of filamentous growth by antagonizing Flo8 functions. We suggest that, similar to the case for S. cerevisiae, a combination of dual control by activation and repression of Flo8 and Sfl1 may contribute to the fine regulatory network in C. albicans morphogenesis responding to different environmental cues.

* Corresponding author. Mailing address: Institute of Biochemistry and Cell Biology, SIBS, Chinese Academy of Sciences, 320 Yue Yang Road, Shanghai 200031, China. Phone: 86-21-54921251. Fax: 86-21-54921011. E-mail: jychen{at}sunm.shcnc.ac.cn

{triangledown} Published ahead of print on 22 August 2007.

Eukaryotic Cell, November 2007, p. 2112-2121, Vol. 6, No. 11
1535-9778/07/$08.00+0     doi:10.1128/EC.00199-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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