Transcription factor that regulates asexual reproduction (PubMed:16207816, PubMed:19028996). Binds the StuA-response elements (StRE) with the consensus sequence 5'-(A/T)CGCG(T/A)N(A/C)-3' at the promoters of target genes (By similarity). Controls the expression of 6 secondary metabolite biosynthetic clusters including 2 involved in the synthesis of alkaloids (fumigaclavine and fumitremorgen), 2 clusters of the ETP class (gliotoxin and an unknown ETP-like toxin), a cluster predicted to produce pseurotin A, and the product of the last cluster is unknown (PubMed:19028996). Controls the production of ergot alkaloids during conidiophore development (PubMed:23925951). Controls expression of sspA and gliP (PubMed:18490465). Involved in the induction of immunoglobulin E-independent mast cell degranulation (PubMed:19527167). Induced at the onset of developmental competence and highly expressed in competent hyphae (PubMed:16207816). Impairs the ability to undergo asexual reproduction with abnormal morphology of conidiophores and only small numbers of dysmorphic conidia exhibiting precocious germination (PubMed:16207816, PubMed:19028996). Displayed reduced expression of the catalase gene cat1 and hypersusceptibility to hydrogen peroxide (PubMed:16207816). Impairs the production of ergot alkaloids such as chanoclavine-I, festuclavine, fumigaclavine A, fumigaclavine B, and fumigaclavine C (PubMed:23925951). Impairs A.fumigatus immunoglobulin E-independent mast cell degranulation induction (PubMed:19527167). Belongs to the EFG1/PHD1/stuA family.