**14. Transcription factors involved in the expression of cellulase and hemicellulase-encoding genes**

A number of genes encoding plant cell wall degrading enzymes appears to present in their pro‐ moter regions regulatory elements for binding of transcriptional activators. The filamentous fungi *A. niger* and *T. reesei* have been the subject of many studies regarding the mechanism of transcriptional regulation of cellulase- and hemicellulase-encoding genes. Also, genes respon‐ sible for the expression of transcription factors found in *A. niger* and *T. reesei* have their homo‐ logs in other *Aspergilli* species and *Neurospora crassa*. In this section, the main transcription regulators involved in plant-polysaccharide degradation found in fungi are presented.
