Transcription repression factor which plays an important role in the establishment of the regional subdivision of the developing brain and in the development of the telencephalon. Interacts with KDM5B (PubMed:12657635). Interacts with GRG6/TLE6 (By similarity). Interacts with TLE1; the interaction is inhibited by interaction with TLE6/GRG6 (By similarity). Expression is restricted to the neurons of the developing telencephalon. The disease is caused by variants affecting the gene represented in this entry. PubMed:7959731 claims that there are 3 different FOXG1 proteins, FOXG1A, FOXG1B, and FOXG1C. It was latter found that there is only one gene and the differences between these three may be sequencing errors since the protein is coded in a unique exon. FOXG1 entry