This gene encodes a basic helix-loop-helix transcription factor which is expressed in oligodendroglial tumors of the brain. The protein is an essential regulator of ventral neuroectodermal progenitor cell fate. The gene is involved in a chromosomal translocation t(14,21)(q11.2,q22) associated with T-cell acute lymphoblastic leukemia. Its chromosomal location is within a region of chromosome 21 which has been suggested to play a role in learning deficits associated with Down syndrome.Synonyms: BHLHB1, Class B basic helix-loop-helix protein 1, OLIG2, Oligo2, Oligodendrocyte transcription factor 2, PRKCBP2, Protein kinase C-binding protein 2, Protein kinase C-binding protein RACK17, RACK17, bHLHB1