The protein encoded by this gene belongs to the inhibitor of DNA binding (ID) family, members of which are transcriptional regulators that contain a helix-loop-helix (HLH) domain but not a basic domain. Members of the ID family inhibit the functions of basic helix-loop-helix transcription factors in a dominant-negative manner by suppressing their heterodimerization partners through the HLH domains. This protein may play a role in negatively regulating cell differentiation. A pseudogene has been identified for this gene.[2]
A research published by "Nature" in 01/2016, authored by Italian researchers Antonio Iavarone and Anna Lasorella, from Columbia University, states that ID2 protein has a relevant role in the development and resistance to therapies of glioblastoma, the most aggressive of brain cancers.[3]
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Iavarone A, Garg P, Lasorella A, Hsu J, Israel MA (1994). "The helix-loop-helix protein Id-2 enhances cell proliferation and binds to the retinoblastoma protein". Genes Dev. 8 (11): 1270–84. doi:10.1101/gad.8.11.1270. PMID7926730.
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Kurabayashi M, Jeyaseelan R, Kedes L (1993). "Two distinct cDNA sequences encoding the human helix-loop-helix protein Id2". Gene. 133 (2): 305–6. doi:10.1016/0378-1119(93)90658-P. PMID8224921.
Mathew S, Chen W, Murty VV, Benezra R, Chaganti RS (1996). "Chromosomal assignment of human ID1 and ID2 genes". Genomics. 30 (2): 385–7. doi:10.1006/geno.1995.0037. PMID8586447.
Langlands K, Yin X, Anand G, Prochownik EV (1997). "Differential interactions of Id proteins with basic-helix-loop-helix transcription factors". J. Biol. Chem. 272 (32): 19785–93. doi:10.1074/jbc.272.32.19785. PMID9242638.
Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, Suyama A, Sugano S (1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene. 200 (1–2): 149–56. doi:10.1016/S0378-1119(97)00411-3. PMID9373149.
Yokota Y, Mansouri A, Mori S, Sugawara S, Adachi S, Nishikawa S, Gruss P (1999). "Development of peripheral lymphoid organs and natural killer cells depends on the helix-loop-helix inhibitor Id2". Nature. 397 (6721): 702–6. doi:10.1038/17812. PMID10067894.
Law SF, Zhang YZ, Fashena SJ, Toby G, Estojak J, Golemis EA (1999). "Dimerization of the docking/adaptor protein HEF1 via a carboxy-terminal helix-loop-helix domain". Exp. Cell Res. 252 (1): 224–35. doi:10.1006/excr.1999.4609. PMID10502414.
Liu J, Shi W, Warburton D (2000). "A cysteine residue in the helix-loop-helix domain of Id2 is critical for homodimerization and function". Biochem. Biophys. Res. Commun. 273 (3): 1042–7. doi:10.1006/bbrc.2000.3055. PMID10891368.
Lasorella A, Noseda M, Beyna M, Yokota Y, Iavarone A (2000). "Id2 is a retinoblastoma protein target and mediates signalling by Myc oncoproteins". Nature. 407 (6804): 592–8. doi:10.1038/35036504. PMID11034201.
Wang S, Sdrulla A, Johnson JE, Yokota Y, Barres BA (2001). "A role for the helix-loop-helix protein Id2 in the control of oligodendrocyte development". Neuron. 29 (3): 603–14. doi:10.1016/S0896-6273(01)00237-9. PMID11301021.
Wong J, Funes-Duran M, Ahlberg J, Round J, O'Connell R, Miller R, Chen E, Richmond PA, Vierra CA (2001). "Characterization of a basic helix-loop-helix protein, ABF-1: nuclear localization, transcriptional properties, and interaction with Id-2". DNA Cell Biol. 20 (8): 465–71. doi:10.1089/104454901316976091. PMID11560778.