Transcriptional repressor which regulates DNA damage responses, morphogenesis, and virulence. Involved in the regulation of filamentous growth through its repression of hyphal-specific genes such as HWP1, ALS3, HYR1, ECE1, and CEK1. Expression is negatively regulated by NRG1, and by the contact with host oral epithelial cells. Up-regulated during the yeast-to-hypha transition through the function of YAK1. Also regulated by SWI4, SWI6, and WOR1, a transcriptional regulator of white-opaque switching. Leads to increased resistance to UV-killing, derepression of various stress-related genes, hyperfilamentous growth, and overexpression of hypha-specific genes. Belongs to the RFX family.