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CCNA2
Available structures
PDB	Ortholog search: PDBe RCSB
List of PDB id codes
	1E9H, 1FIN, 1FVV, 1GY3, 1H1P, 1H1Q, 1H1R, 1H1S, 1H24, 1H25, 1H26, 1H27, 1H28, 1JST, 1JSU, 1OGU, 1OI9, 1OIU, 1OIY, 1OKV, 1OKW, 1OL1, 1OL2, 1P5E, 1PKD, 1QMZ, 1URC, 1VYW, 2BKZ, 2BPM, 2C4G, 2C5N, 2C5O, 2C5V, 2C5X, 2C6T, 2CCH, 2CCI, 2CJM, 2I40, 2IW6, 2IW8, 2IW9, 2UUE, 2UZB, 2UZD, 2UZE, 2UZL, 2V22, 2WEV, 2WFY, 2WHB, 2WIH, 2WIP, 2WMA, 2WMB, 2WPA, 2WXV, 2X1N, 3EID, 3EJ1, 3EOC, 3F5X, 4BCK, 4BCM, 4BCN, 4BCP, 4CFM, 4CFN, 4CFU, 4CFV, 4CFW, 4CFX, 4EOI, 4EOJ, 4EOK, 4EOL, 4EOM, 4EON, 4EOO, 4EOP, 4EOQ, 4EOR, 4EOS, 4FX3, 5CYI, 5IF1
Identifiers
Aliases	CCNA2, CCN1, CCNA, cyclin A2
External IDs	OMIM: 123835; MGI: 108069; HomoloGene: 55562; GeneCards: CCNA2; OMA:CCNA2 - orthologs
Gene location (Human)
Chr.	Chromosome 4 (human)
End	121,823,883 bp
Gene location (Mouse)
Chr.	Chromosome 3 (mouse)
End	36,626,299 bp
RNA expression pattern
	Top expressed in
	ventricular zone; ; oocyte; ; secondary oocyte; ; ganglionic eminence; ; gonad; ; bone marrow; ; stromal cell of endometrium; ; rectum; ; mucosa of transverse colon; ; trabecular bone;
	Top expressed in
	fetal liver hematopoietic progenitor cell; ; genital tubercle; ; tail of embryo; ; Paneth cell; ; somite; ; ventricular zone; ; maxillary prominence; ; mandibular prominence; ; ureter; ; epiblast;
	More reference expression data
	; ;
	More reference expression data
Gene ontology
Molecular function	protein binding; protein kinase binding; cyclin-dependent protein kinase activity; protein domain specific binding; protein kinase activity; cyclin-dependent protein serine/threonine kinase regulator activity;
Cellular component	cytoplasm; female pronucleus; male pronucleus; nucleoplasm; nucleus; cyclin-dependent protein kinase holoenzyme complex; cytosol; cyclin A2-CDK2 complex;
Biological process	cochlea development; cellular response to luteinizing hormone stimulus; response to estradiol; response to glucagon; positive regulation of fibroblast proliferation; cellular response to estradiol stimulus; cellular response to organic cyclic compound; cellular response to insulin-like growth factor stimulus; cellular response to platelet-derived growth factor stimulus; cellular response to leptin stimulus; cell division; positive regulation of transcription, DNA-templated; animal organ regeneration; cellular response to nitric oxide; cell cycle; Ras protein signal transduction; viral process; cellular response to hypoxia; cellular response to cocaine; G2/M transition of mitotic cell cycle; protein deubiquitination; cell cycle G1/S phase transition; regulation of cell cycle; regulation of cyclin-dependent protein serine/threonine kinase activity; mitotic cell cycle; regulation of DNA replication; regulation of mitotic nuclear division; positive regulation of cell population proliferation; positive regulation of cell cycle;
	Sources:Amigo / QuickGO
Orthologs
	890
	12428
	ENSG00000145386
	ENSMUSG00000027715
	P20248
	P51943
	NM_001237
	NM_009828
	NP_001228
	NP_033958
	Wikidata
View/Edit Human	View/Edit Mouse

Cyclin-A2 is a protein that in humans is encoded by the CCNA2 gene.^[5] It is one of the two types of cyclin A: cyclin A1 is expressed during meiosis and embryogenesis while cyclin A2 is expressed in the mitotic division of somatic cells.^[6]

Function

Cyclin A2 belongs to the cyclin family, whose members regulate cell cycle progression by interacting with CDK kinases. Cyclin A2 is unique in that it can activate two different CDK kinases; it binds CDK2 during S phase, and CDK1 during the transition from G2 to M phase.^[7]

Cyclin A2 is synthesized at the onset of S phase and localizes to the nucleus, where the cyclin A2-CDK2 complex is implicated in the initiation and progression of DNA synthesis. Phosphorylation of CDC6 and MCM4 by the cyclin A2-CDK2 complex prevents re-replication of DNA during the cell cycle.^[6]

Cyclin A2 is involved in the G2/M transition but it cannot independently form a maturation promoting factor (MPF).^[8] Recent studies have shown that the cyclin A2-CDK1 complex triggers cyclin B1-CDK1 activation which results in chromatin condensation and the breakdown of the nuclear envelope.^[9]

Regulation

The levels of cyclin A2 are tightly synchronized with the progression of the cell cycle.^[10] Transcription initiates in late G1, peaks and plateaus in mid-S, and declines in G2.^[10]^[6]

Cyclin A2 transcription is mostly regulated by the transcription factor E2F and begins in G1, after the R point.^[10]^[6] Absence of cyclin A2 before the R point is due to the E2F inhibition by hypophosphorylated retinoblastoma protein (pRb). After the R point, pRb is phosphorylated and can no longer bind E2F, leading to cyclin A2 transcription.^[11]^[12] The cyclin A2-CDK2 complex eventually phosphorylates E2F, turning off cyclin A2 transcription.^[10] E2F promotes cyclin A2 transcription by de-repressing the promoter.^[10]^[11]

Interactions

Cyclin A2 has been shown to interact with:

DNA Repair

Cyclin A2 regulates homologous recombinational DNA repair in human breast cancer cells^[21] Loss of cyclin A2 causes high rates of double-strand breaks in DNA. The increase in double-strand breaks is a consequence of defective homologous recombinational repair of the breaks resulting from reduced MRE11 and RAD51 DNA repair proteins.^[21] Cyclin A2 mediates the abundance of MRE11 nuclease by binding to Mre11 mRNA. Cyclin A2 mediates the abundance of RAD51 protein by inhibiting proteasome degradation of this protein.

During mouse development and aging, cyclin A2 promotes DNA repair, particularly double-strand break repair, in the brain.^[22] Also in mice, cyclin A2 was found to be an RNA binding protein that controls the translation of Mre11 mRNA.^[23]

Clinical significance

Cyclin A2 (Ccna2) is a key protein involved in the direction of mammalian cardiac myocytes to grow and divide, and has been shown to induce cardiac repair following myocardial infarction.^[24] Normally, Ccna2 is silenced postnatally in mammalian cardiac myocytes. Because of this gene silencing, adult heart muscle cells cannot divide readily to repair and regenerate after a heart attack.^[24]

Ccna2 has been found to induce cardiac repair in small-animal models following myocardial infarction.^[24] Preclinical trials involving injections of adenovirus which contained the Ccna2 gene into infarcted porcine (pig) hearts has shown to be protective of MI in pig hearts.^[24] Ccna2 mediated cardiac repair showed both a decrease in fibrosis in the peri-infarct tissue and a greater number of cardiomyocytes at the sites of injection.^[24] Delivery of Ccna2 into cardiac tissue invokes a regenerative response and markedly enhances cardiac function.^[24]^[25]^[26]

Cancer

Increased expression of cyclin A2 has been observed in many types of cancer such as breast, cervical, liver, and lung among others.^[6]^[27]^[28]^[29]^[30] While it is not clear whether increased expression of cyclin A2 is a cause or result of tumorigenesis, it is indicative of prognostic values such as predictions of survival or relapse.^[6]

Overexpression of cyclin A2 in mammalian cells can result in the delayed onset of metaphase and anaphase.^[31] It is also possible that cyclin A2-CDK contributes to tumorigenesis by the phosphorylation of oncoproteins or tumor suppressors like p53.^[32]

References

^ ^a ^b ^c GRCh38: Ensembl release 89: ENSG00000145386 – Ensembl, May 2017
^ ^a ^b ^c GRCm38: Ensembl release 89: ENSMUSG00000027715 – Ensembl, May 2017
^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^ Paterlini P, De Mitri MS, Martin C, Münnich A, Bréchot C (July 1991). "A TaqI polymorphism in the human cyclin A gene". Nucleic Acids Res. 19 (9): 2516. doi:10.1093/nar/19.9.2516. PMC 329485. PMID 1675006.
^ ^a ^b ^c ^d ^e ^f Yam CH, Fung TK, Poon RY (Aug 2002). "Cyclin A in cell cycle control and cancer". Cell. Mol. Life Sci. 59 (8): 1317–1326. doi:10.1007/s00018-002-8510-y. PMC 11337442. PMID 12363035. S2CID 97398.
^ Pagano M, Pepperkok R, Verde F, Ansorge W, Draetta G (March 1992). "Cyclin A is required at two points in the human cell cycle". EMBO J. 11 (3): 961–971. doi:10.1002/j.1460-2075.1992.tb05135.x. PMC 556537. PMID 1312467.
^ Fung TK, Ma HT, Poon RY (Mar 2007). "Specialized roles of the two mitotic cyclins in somatic cells: cyclin A as an activator of M phase-promoting factor". Mol. Biol. Cell. 18 (5): 1861–1873. doi:10.1091/mbc.E06-12-1092. PMC 1855023. PMID 17344473.
^ Gong D, Ferrell JE (Sep 2010). "The roles of cyclin A2, B1, and B2 in early and late mitotic events". Mol. Biol. Cell. 21 (18): 3149–3161. doi:10.1091/mbc.E10-05-0393. PMC 2938381. PMID 20660152.
^ ^a ^b ^c ^d ^e Henglein B, Chenivesse X, Wang J, Eick D, Bréchot C (Jun 1994). "Structure and cell cycle-regulated transcription of the human cyclin A gene". Proc. Natl. Acad. Sci. U.S.A. 91 (12): 5490–5494. Bibcode:1994PNAS...91.5490H. doi:10.1073/pnas.91.12.5490. PMC 44021. PMID 8202514.
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^ ^a ^b Xu M, Sheppard KA, Peng CY, Yee AS, Piwnica-Worms H (1994). "Cyclin A/CDK2 binds directly to E2F-1 and inhibits the DNA-binding activity of E2F-1/DP-1 by phosphorylation". Mol. Cell. Biol. 14 (12): 8420–8431. doi:10.1128/MCB.14.12.8420. PMC 359381. PMID 7969176.
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^ Dyson N, Dembski M, Fattaey A, Ngwu C, Ewen M, Helin K (December 1993). "Analysis of p107-associated proteins: p107 associates with a form of E2F that differs from pRB-associated E2F-1". J. Virol. 67 (12): 7641–7647. doi:10.1128/JVI.67.12.7641-7647.1993. PMC 238233. PMID 8230483.
^ Joaquin M, Bessa M, Saville MK, Watson RJ (November 2002). "B-Myb overcomes a p107-mediated cell proliferation block by interacting with an N-terminal domain of p107". Oncogene. 21 (52): 7923–7932. doi:10.1038/sj.onc.1206001. PMID 12439743. S2CID 21761703.
^ Rosner M, Hengstschläger M (November 2004). "Tuberin binds p27 and negatively regulates its interaction with the SCF component Skp2". J. Biol. Chem. 279 (47): 48707–48715. doi:10.1074/jbc.M405528200. PMID 15355997.
^ Marti A, Wirbelauer C, Scheffner M, Krek W (May 1999). "Interaction between ubiquitin-protein ligase SCFSKP2 and E2F-1 underlies the regulation of E2F-1 degradation". Nat. Cell Biol. 1 (1): 14–19. doi:10.1038/8984. PMID 10559858. S2CID 8884226.
^ ^a ^b Gu WW, Lin J, Hong XY (October 2017). "Cyclin A2 regulates homologous recombination DNA repair and sensitivity to DNA damaging agents and poly(ADP-ribose) polymerase (PARP) inhibitors in human breast cancer cells". Oncotarget. 8 (53): 90842–90851. doi:10.18632/oncotarget.20412. PMC 5710888. PMID 29207607.
^ Gygli PE, Chang JC, Gokozan HN, Catacutan FP, Schmidt TA, Kaya B, et al. (July 2016). "Cyclin A2 promotes DNA repair in the brain during both development and aging". Aging. 8 (7): 1540–1570. doi:10.18632/aging.100990. PMC 4993346. PMID 27425845.
^ Kanakkanthara A, Jeganathan KB, Limzerwala JF, Baker DJ, Hamada M, Nam HJ, et al. (September 2016). "Cyclin A2 is an RNA binding protein that controls Mre11 mRNA translation". Science. 353 (6307): 1549–1552. Bibcode:2016Sci...353.1549K. doi:10.1126/science.aaf7463. PMC 5109925. PMID 27708105.
^ ^a ^b ^c ^d ^e ^f Shapiro SD, Ranjan AK, Kawase Y, Cheng RK, Kara RJ, Bhattacharya R, Guzman-Martinez G, Sanz J, Garcia MJ, Chaudhry HW (2014). "Cyclin A2 induces cardiac regeneration after myocardial infarction through cytokinesis of adult cardiomyocytes". Sci Transl Med. 6 (224): 224ra27. doi:10.1126/scitranslmed.3007668. PMID 24553388. S2CID 20386712.
^ Woo YJ, Panlilio CM, Cheng RK, Liao GP, Suarez EE, Atluri P, Chaudhry HW (2007). "Myocardial regeneration therapy for ischemic cardiomyopathy with cyclin A2". J. Thorac. Cardiovasc. Surg. 133 (4): 927–933. doi:10.1016/j.jtcvs.2006.07.057. PMID 17382628.
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^ Ohashi R, Gao C, Miyazaki M, Hamazaki K, Tsuji T, Inoue Y, Uemura T, Hirai R, Shimizu N, Namba M (Jan–Feb 2001). "Enhanced expression of cyclin E and cyclin A in human hepatocellular carcinomas". Anticancer Res. 21 (1B): 657–662. PMID 11299822.
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^ Wang Y, Prives C (Jul 1995). "Increased and altered DNA binding of human p53 by S and G2/M but not G1 cyclin-dependent kinases". Nature. 376 (6535): 88–91. Bibcode:1995Natur.376...88W. doi:10.1038/376088a0. PMID 7596441. S2CID 4240439.

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