GLI Family Zinc Finger Protein 1 (GLI1)

GLI1 encodes a member of the Kruppel family of zinc finger proteins. The encoded transcription factor is activated by the sonic hedgehog signal transduction cascade and regulates stem cell proliferation. The activity and nuclear localization of this protein is negatively regulated by p53 in an inhibitory loop. Multiple transcript variants encoding different isoforms have been found for this gene.The zinc fingers contain sequence elements that place the GLI gene product among the Kruppel (Kr) family of zinc finger proteins. (The German word """Kruppel""" means """cripple""" or """dwarf.""") The Drosophila gene is a member of the gap class of segmentation genes; thoracic and anterior abdominal segments fail to form in Kr mutant embryos.