MAX gene-associated protein (MGA) (MGA)

MAX gene-associated protein (MGA) is a large, multi-domain transcription factor that serves as a key regulator within the MYC/MAX/MAD network. It is characterized by the presence of both a basic helix-loop-helix leucine zipper (bHLH-Zip) domain and a T-box DNA-binding domain, which enable it to heterodimerize with MAX and bind to E-box or Brachyury-binding elements (UniProt Q8IWI9). MGA primarily functions as a transcriptional repressor, often as a core component of the PRC1.6 (Polycomb repressive complex 1.6), which silences genes involved in the cell cycle and germ cell development (PubMed 27477906). In the context of oncology, MGA is frequently identified as a tumor suppressor; its loss or inactivation via mutation is linked to the progression of lung adenocarcinoma, chronic lymphocytic leukemia, and colorectal cancer by allowing unopposed MYC-driven transcription (PubMed 28806135). Although there are currently no FDA-approved drugs directly targeting MGA, it is an area of intense research for therapeutic intervention in MYC-dependent malignancies, particularly through strategies that restore its repressive function or exploit synthetic lethal vulnerabilities (NCBI Gene 10469).

Other names

MAX-associated proteinMAD5MGADMAX dimerization protein MGA

Competitive inhibition of MYC-MAX heterodimerization and recruitment of the PRC1.6 repressive complex to E-box containing promoters.