In addition, other specifically induced factors playing a potential role in protein utilization were identified, including heat shock proteins, various transporters, metabolic enzymes, transcription factors and hypothetical proteins with unknown functions (Zaugg et al., 2009; Staib et al., 2010). Similar approaches were also supported

by the analysis of suppression subtractive hybridization libraries, applied for the identification of novel dermatophyte genes specifically expressed by T. rubrum cells upon contact with keratin, in response to varying pH or to other environmental stimuli (Kaufman et al., 2005; Baeza et al., 2007; Maranhao et al., 2007, 2009; Peres et al., 2010; Silveira et al., 2010). A comparative transcriptional analysis in the two closely related species T. tonsurans and Trichophyton HSP inhibitor review equinum detected differential,

species-specific expression levels of selected genes encoding secreted proteases upon growth on keratin (Preuett et al., 2010). In order to unravel pathogenicity-related adaptation mechanisms of dermatophytes during infection, we explored the transcriptional response of the fungal cells in an animal model. For this approach, the zoophilic dermatophyte A. benhamiae was selected as an appropriate species for several reasons (Fig. 2). Arthroderma benhamiae is zoophilic and causes inflammatory cutaneous infections not only in humans but also in guinea-pigs, allowing the establishment of an animal model (Staib et al., 2010). Under laboratory conditions, A. benhamiae grows relatively fast and produces abundant microconidia,

single-nucleated Belnacasan molecular weight round-oval cells that are useful for transformation. Cleistothecia formation further facilitates genetic analyses and allows to shed light on the basis of sexual development in dermatophytes. As a major additional Isotretinoin prerequisite, the genome of our A. benhamiae strain, which had been isolated from a patient with highly inflammatory tinea faciei (Fumeaux et al., 2004), has recently been decoded and annotated (Burmester et al., 2011) (Fig. 2). Transcriptional analysis in A. benhamiae cells isolated during experimental cutaneous infection of guinea-pigs uncovered a distinct protease gene expression profile, which is essentially different from the pattern displayed during in vitro growth on keratin. Most notably, a differential expression of genes coding for members of the Sub and Mep protease families was detected. Instead of the major keratinase genes expressed in vitro, others were activated specifically during infection, suggesting functions that are not necessarily associated with the degradation of keratin. Future studies will address the strong in vivo activation of the gene encoding the serine protease Sub6, a known major allergen in the related dermatophyte T. rubrum. The broad A.