MAX-interacting protein 1 is a protein that in humans is encoded by the MXI1gene.
Expression of the c-myc gene, which produces an oncogenic transcription factor, is tightly regulated in normal cells but is frequently deregulated in human cancers. The protein encoded by this gene is a transcriptional repressor thought to negatively regulate MYC function, and is therefore a potential tumor suppressor. This protein inhibits the transcriptional activity of MYC by competing for MAX, another basic helix-loop-helix protein that binds to MYC and is required for its function. Defects in this gene are frequently found in patients with prostate tumors. Three alternatively spliced transcripts encoding different isoforms have been described. Additional alternatively spliced transcripts may exist but the products of these transcripts have not been verified experimentally.
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Albarosa R, DiDonato S, Finocchiaro G (1995). "Redefinition of the coding sequence of the MXI1 gene and identification of a polymorphic repeat in the 3' non-coding region that allows the detection of loss of heterozygosity of chromosome 10q25 in glioblastomas". Hum. Genet.95 (6): 709–11. doi:10.1007/BF00209493. PMID7789959.
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Edelhoff S, Ayer DE, Zervos AS et al. (1994). "Mapping of two genes encoding members of a distinct subfamily of MAX interacting proteins: MAD to human chromosome 2 and mouse chromosome 6, and MXI1 to human chromosome 10 and mouse chromosome 19". Oncogene9 (2): 665–8. PMID8290278.
Gupta K, Anand G, Yin X et al. (1998). "Mmip1: a novel leucine zipper protein that reverses the suppressive effects of Mad family members on c-myc". Oncogene16 (9): 1149–59. doi:10.1038/sj.onc.1201634. PMID9528857.