GLI family zinc finger protein 1 (GLI1)

GLI family zinc finger protein 1 (GLI1) is a DNA-binding transcription factor in the Kruppel family of zinc finger proteins, which mediates the Hedgehog signaling pathway in vertebrates[1][3][4][6]. It regulates gene expression by binding to target gene promoters and functions as both a transcriptional activator and, under some contexts, a repressor[1]. GLI1 is essential for embryonic development—regulating cell fate, proliferation, and differentiation—and its dysregulation is implicated in oncogenesis, especially in tumors of the brain, skin (basal cell carcinoma), and muscle[1][3][6]. Aberrant activation of GLI1, through the Hedgehog pathway or gene amplification/mutation, drives tumorigenesis and is a key resistance mechanism to upstream pathway inhibitors[1]. GLI1 participates in gene regulatory networks through DNA-binding zinc finger domains and interacts with multiple cofactors (such as SUFU, STK36, SAP18, and ZIC1) to modulate chromatin architecture and gene expression[1][6]. Elevated GLI1 expression is both a functional marker of Hedgehog pathway activity and a prognostic indicator for some cancers[1]. GLI1 is one of three mammalian GLI proteins—with GLI2 and GLI3—each sharing structural motifs and mediating complementary or antagonistic roles within the Hedgehog (Shh) signaling axis[1][2].

Other names

Glioma-associated oncogeneOncogene GLIGLI-Kruppel family member GLI1glioma-associated oncogene 1glioma-associated oncogene homolog 1 (zinc finger)

Transcriptional regulation via direct DNA binding at GLI consensus sites Mediator of Sonic Hedgehog (Shh) signaling by acting as a transcriptional effector Interaction with cofactors (e.g., SUFU) modulates activation/repression functions