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<p>CSV import</p> <p><b>New page</b></p><div>[[File:Cyclin Expression.svg|left|422px]] &#039;&#039;&#039;Cyclin A&#039;&#039;&#039; is a member of the [[cyclin]] family, which plays a significant role in regulating the [[cell cycle]]. Cyclin A is involved in the control of the cell cycle at two main points: the transition from [[G1 phase|G1]] to [[S phase]] and the progression through [[G2 phase|G2]] to [[mitosis]]. This protein is essential for [[DNA replication]] and [[mitotic]] functions, making it a key player in cell division and proliferation.<br /> <br /> ==Function==<br /> Cyclin A associates with various [[cyclin-dependent kinases (CDKs)]], including [[CDK2]] in S phase and [[CDK1]] in G2 phase. These complexes are crucial for the progression of the cell cycle. In the G1/S transition, cyclin A-CDK2 complex is involved in the initiation of DNA replication by phosphorylating proteins that are part of the pre-replication complexes assembled on DNA during G1 phase. As the cell progresses to G2 phase, cyclin A binds to CDK1, forming a complex that prepares the cell for mitosis by phosphorylating key proteins required for mitotic entry.<br /> <br /> ==Regulation==<br /> The expression and activity of cyclin A are tightly regulated throughout the cell cycle. Cyclin A levels are low in the G1 phase, begin to rise in the S phase, peak in G2, and rapidly degrade as cells exit mitosis. This degradation is mediated by the [[anaphase-promoting complex (APC/C)]], an E3 ubiquitin ligase that targets cyclin A for proteasomal degradation, ensuring that the cell cycle progresses in a unidirectional manner.<br /> <br /> ==Clinical Significance==<br /> Abnormal expression of cyclin A is associated with various [[cancer]]s, as it can lead to uncontrolled cell proliferation. Overexpression of cyclin A has been observed in a wide range of tumors and is often correlated with poor prognosis. Therefore, cyclin A is considered a potential biomarker for cancer diagnosis and prognosis, as well as a target for therapeutic intervention.<br /> <br /> ==Research==<br /> Research on cyclin A not only focuses on its role in cell cycle regulation and cancer but also explores its potential in therapeutic targeting. Inhibitors of cyclin A-associated kinases, such as CDK2, are being investigated for their ability to halt the proliferation of cancer cells. Understanding the precise mechanisms of cyclin A regulation and its interactions with CDKs could lead to the development of novel cancer therapies.<br /> <br /> [[Category:Cell cycle]]<br /> [[Category:Proteins]]<br /> [[Category:Cancer research]]<br /> <br /> {{biology-stub}}</div>

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