Acts as a transcriptional activator (PubMed:19706761, PubMed:10806483, PubMed:19878745, PubMed:24076122, PubMed:24311597, PubMed:24217340). Binds to the DNA consensus sequence 5'-GACCACCCA-3' (PubMed:2105456, PubMed:8378770, PubMed:24217340). Regulates the transcription of specific genes during normal development (PubMed:19706761). Plays a role in craniofacial development and digital development, as well as development of the central nervous system and gastrointestinal tract. Mediates SHH signaling (PubMed:19706761, PubMed:28973407). Plays a role in cell proliferation and differentiation via its role in SHH signaling (PubMed:11238441, PubMed:28973407). Acts as a transcriptional activator, but activates a different set of genes than isoform 1. Activates expression of CD24, unlike isoform 1. Mediates SHH signaling. Promotes cancer cell migration. Interacts with KIF7 (By similarity). Interacts with STK36 (PubMed:10806483). Interacts with ZIC1; the interaction enhances transcription activation (PubMed:11238441). Interacts with SUFU; this inhibits transcriptional activation by GLI1 (PubMed:10806483, PubMed:24311597, PubMed:24217340, PubMed:28965847). Tethered in the cytoplasm by binding to SUFU (PubMed:10806483). Activation and translocation to the nucleus is promoted by interaction with STK36 (PubMed:10806483). Phosphorylation by ULK3 may promote nuclear localization (PubMed:19878745). Translocation to the nucleus is promoted by interaction with ZIC1 (PubMed:11238441). Detected in testis (at protein level) (PubMed:2105456). Testis, myometrium and fallopian tube. Also expressed in the brain with highest expression in the cerebellum, optic nerve and olfactory tract (PubMed:19878745). Isoform 1 is detected in brain, spleen, pancreas, liver, kidney and placenta; isoform 2 is not detectable in these tissues (PubMed:19706761). Isoform 1 and isoform 2 are amplified in glioblastoma cells. Phosphorylated in vitro by ULK3. Acetylation at Lys-518 down-regulates transcriptional activity. Deacetylated by HDAC1. Ubiquitinated by the CRL2(FEM1B) complex, suppressing GLI1 transcriptional activator activity. The disease is caused by variants affecting the gene represented in this entry. The disease may be caused by variants affecting the gene represented in this entry. Undetectable in normal cells but highly expressed in cancer cells. Belongs to the GLI C2H2-type zinc-finger protein family.