Transcription factor EC (TFEC)

Transcription factor EC (TFEC) is a member of the microphthalmia (MiT) family of basic helix-loop-helix leucine zipper transcription factors that binds E-box DNA recognition sequences as either a homo- or heterodimer[1][4]. TFEC functions as both a transcriptional repressor and activator, influencing gene expression in multiple cellular processes, including cell survival, growth, and differentiation[1][4][8]. It can activate transcription of the nonmuscle myosin II heavy chain-A gene and co-regulate target genes with micropthalmia-associated transcription factor (MITF), particularly in osteoclasts[1][4]. TFEC may act as a repressor on certain promoter elements and as an activator on others, showing context-dependent regulatory functions[1][8]. Alternative splicing produces multiple isoforms with differing activation potentials[4]. Mutations or abnormal expression of TFEC have been associated with human diseases such as hematologic cancer and Waardenburg syndrome type 2A[1]. No approved drugs are known to specifically target TFEC, and its status as a direct therapeutic target remains unestablished.

Other names

BHLHE34TCFECTFECLTFE-CTFEC-LbHLHe34hTFEC-LClass E basic helix-loop-helix protein 34Transcription factor EC-like