Involved in cell division and chromosome segregation (By similarity). Involved in sporulation (PubMed:16484182, PubMed:22355671). May coordinate the cessation of aerial hyphae growth and subsequent chromosome segregation and/or septation (PubMed:16484182, PubMed:22355671). Required for expression of the ParB partioning protein during sporogenesis. Activates its own transcription and represses WhiB (PubMed:16484182). Binds with low affinity to its own promoter and to the Parp2 sporulation-specific promoter. Also binds directly to the RNA polymerase sigma factor WhiG, leading to inhibition of WhiG-dependent transcription in a dose-dependent manner (PubMed:22355671). Monomer in solution. Induced when aerial mycelia start forming, expression is maximal when sporulation starts. Transcribed both as part of an operon and from its own specific promoter during sporulation (PubMed:10986251). Transcription is stimulated by WhiG (PubMed:22355671). DNA binding is primarily driven by the H-T-H domain, but requires full-length protein for maximum affinity. Cells lacking this gene do not sporulate; instead of aerial hyphae of unicellular spores, long slightly coiled unseptated stalks form. Belongs to the WhiA family. There may be second mutations present in each of mutant strains C58 and C213.