The protein encoded by this gene is a ubiquitously expressed nuclear protein. It binds directly, with several other proteins, to retinoblastoma protein which regulates cell proliferation. It was formerly known as Retinoblastoma Binding Protein 2 (RBP2). This protein also interacts with rhombotin-2 which functions distinctly in erythropoiesis and in T-cell leukemogenesis. Rhombotin-2 is thought to either directly affect the activity of the encoded protein or may indirectly modulate the functions of the retinoblastoma protein by binding to this protein. Alternatively spliced transcript variants encoding distinct isoforms have been found for this gene.[2]
The Drosophila homolog, LID, was found to be an H3K4 histone demethylase that binds to c-Myc.[3] It was recently renamed to Lysine Demethylase 5A (KDM5A).
JARID1A is a major component of the circadian clock, the upregulation of which at the end of the sleep phase blocks HDAC1 activity. Blocking HDAC1 activity results in an upregulation of CLOCK and BMAL1 and consequent upregulation of PER proteins. The PSF (polypyrimidine tract-binding protein-associated splicing factor) within the PER complex recruits SIN3A, a scaffold for assembly of transcriptional inhibitory complexes and rhythmically delivers histone deacetylases to the Per1 promoter, which repress Per1 transcription.[7][8]
Knockdown of JARID1A promoted osteogenic differentiation of human adipose-derived stromal cells in vitro and in vivo and resulted in marked increases of mRNA expression of osteogenesis-associated genes such as alkaline phosphatase (ALP), osteocalcin (OC), and osterix (OSX). RBP2 was shown to occupy the promoters of OSX and OC to maintain the level of the H3K4me3 mark by chromatin immunoprecipitation assays. RBP2 was also physically and functionally associated with RUNX2, an essential transcription factor that governed osteoblastic differentiation. RUNX2 knockdown impaired the repressive activity of RBP2 in osteogenic differentiation of human adipose-derived stromal cells.[9]
References
↑Defeo-Jones D, Huang PS, Jones RE, Haskell KM, Vuocolo GA, Hanobik MG, Huber HE, Oliff A (Jul 1991). "Cloning of cDNAs for cellular proteins that bind to the retinoblastoma gene product". Nature. 352 (6332): 251–4. doi:10.1038/352251a0. PMID1857421.
↑Ge W, Shi L, Zhou Y, Liu Y, Ma GE, Jiang Y, Xu Y, Zhang X, Feng H (2011). "Inhibition of osteogenic differentiation of human adipose-derived stromal cells by retinoblastoma binding protein 2 repression of RUNX2-activated transcription". Stem Cells (Dayton, Ohio). 29 (7): 1112–25. doi:10.1002/stem.663. PMID21604327.
Maruyama K, Sugano S (Jan 1994). "Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides". Gene. 138 (1–2): 171–4. doi:10.1016/0378-1119(94)90802-8. PMID8125298.
Fattaey AR, Helin K, Dembski MS, Dyson N, Harlow E, Vuocolo GA, Hanobik MG, Haskell KM, Oliff A, Defeo-Jones D (Nov 1993). "Characterization of the retinoblastoma binding proteins RBP1 and RBP2". Oncogene. 8 (11): 3149–56. PMID8414517.
Baens M, Aerssens J, van Zand K, Van den Berghe H, Marynen P (Sep 1995). "Isolation and regional assignment of human chromosome 12p cDNAs". Genomics. 29 (1): 44–52. doi:10.1006/geno.1995.1213. PMID8530100.
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Mao S, Neale GA, Goorha RM (Apr 1997). "T-cell oncogene rhombotin-2 interacts with retinoblastoma-binding protein 2". Oncogene. 14 (13): 1531–9. doi:10.1038/sj.onc.1200988. PMID9129143.
Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, Suyama A, Sugano S (Oct 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.
Chan SW, Hong W (Jul 2001). "Retinoblastoma-binding protein 2 (Rbp2) potentiates nuclear hormone receptor-mediated transcription". The Journal of Biological Chemistry. 276 (30): 28402–12. doi:10.1074/jbc.M100313200. PMID11358960.
Sandrock B, Egly JM (Sep 2001). "A yeast four-hybrid system identifies Cdk-activating kinase as a regulator of the XPD helicase, a subunit of transcription factor IIH". The Journal of Biological Chemistry. 276 (38): 35328–33. doi:10.1074/jbc.M105570200. PMID11445587.
Benevolenskaya EV, Murray HL, Branton P, Young RA, Kaelin WG (Jun 2005). "Binding of pRB to the PHD protein RBP2 promotes cellular differentiation". Molecular Cell. 18 (6): 623–35. doi:10.1016/j.molcel.2005.05.012. PMID15949438.
Tzschach A, Lenzner S, Moser B, Reinhardt R, Chelly J, Fryns JP, Kleefstra T, Raynaud M, Turner G, Ropers HH, Kuss A, Jensen LR (Apr 2006). "Novel JARID1C/SMCX mutations in patients with X-linked mental retardation". Human Mutation. 27 (4): 389. doi:10.1002/humu.9420. PMID16541399.
Roesch A, Becker B, Schneider-Brachert W, Hagen I, Landthaler M, Vogt T (Aug 2006). "Re-expression of the retinoblastoma-binding protein 2-homolog 1 reveals tumor-suppressive functions in highly metastatic melanoma cells". The Journal of Investigative Dermatology. 126 (8): 1850–9. doi:10.1038/sj.jid.5700324. PMID16645588.
Olsen JV, Blagoev B, Gnad F, Macek B, Kumar C, Mortensen P, Mann M (Nov 2006). "Global, in vivo, and site-specific phosphorylation dynamics in signaling networks". Cell. 127 (3): 635–48. doi:10.1016/j.cell.2006.09.026. PMID17081983.