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The secreted aspartic proteases (Saps) are among the most studied virulence determinants in  Candida albicans . These proteins are translated as pre-pro-enzymes consisting of a signal sequence followed by a propeptide and the mature enzyme. The propeptides of secreted proteinases are important for the correct processing, folding/secretion of the mature enzyme. In this study, the DNA sequences of  C. albicans  Saps were screened and a microsatellite was identified in  SAP8  propeptide region. The genetic variability of the repetitive region of Sap8 propeptide was determined in 108  C. albicans  independent strains isolated from different types of infection: oral infection (OI), oral commensal (OC), vulvovaginal candidiasis (VVC), and bloodstream infections (BSI). Nine different propeptides for Sap8 processing were identified whose frequencies varied with the type of infection. OC strains presented the highest gene diversity while OI isolated the lowest. The contribution of the Saps to mucosal and systemic infections has been demonstrated and recently Sap8 has been implicated in the cleavage of a signalling glycoprotein that leads to Cek1-MAPK pathway activation. This work is the first to identify a variable microsatellite in the propeptide of a secreted aspartic protease and brings new insights into the variability of Sap8.

Genetic Variability ofCandida albicansSap8 Propeptide in Isolates from Different Types of Infection