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<p>CSV import</p> <p><b>New page</b></p><div>= Cyclin A1 =<br /> <br /> &#039;&#039;&#039;Cyclin A1&#039;&#039;&#039; is a member of the cyclin family, which is a group of proteins that are crucial regulators of the cell cycle. Cyclins function as regulatory subunits that activate cyclin-dependent kinases (CDKs), and they play essential roles in the progression of cells through the cell cycle.<br /> <br /> == Structure and Function ==<br /> Cyclin A1 is encoded by the &#039;&#039;CCNA1&#039;&#039; gene in humans. It is one of the two A-type cyclins, the other being [[Cyclin A2]]. Cyclin A1 is primarily expressed in the [[testis]] and is involved in the regulation of the [[meiosis|meiotic cell cycle]] in [[spermatogenesis]].<br /> <br /> Cyclin A1 binds to and activates [[CDK2]] and [[CDK1]], which are crucial for the transition from the G1 phase to the S phase and the G2 phase to the M phase of the cell cycle, respectively. This activation is essential for the proper progression of meiosis in male germ cells.<br /> <br /> == Expression and Regulation ==<br /> Cyclin A1 expression is tightly regulated and is predominantly found in the [[germ cells]] of the testis. Its expression is also detected in some [[leukemia]] cells, suggesting a role in certain types of cancer.<br /> <br /> The regulation of Cyclin A1 involves various [[transcription factors]] and signaling pathways. For instance, the [[retinoblastoma protein]] (pRB) pathway is known to influence Cyclin A1 expression. Additionally, Cyclin A1 is subject to [[ubiquitination]] and subsequent degradation by the [[proteasome]], which is a common mechanism for controlling cyclin levels and ensuring proper cell cycle progression.<br /> <br /> == Clinical Significance ==<br /> Cyclin A1 has been implicated in the development of certain cancers, particularly [[acute myeloid leukemia]] (AML). Overexpression of Cyclin A1 has been observed in AML, and it is thought to contribute to the uncontrolled proliferation of leukemic cells.<br /> <br /> Research is ongoing to understand the potential of Cyclin A1 as a [[biomarker]] for cancer diagnosis and prognosis, as well as a target for therapeutic intervention.<br /> <br /> == See Also ==<br /> * [[Cyclin A2]]<br /> * [[Cyclin-dependent kinase]]<br /> * [[Cell cycle]]<br /> * [[Meiosis]]<br /> <br /> == References ==<br /> * Pagano, M., &amp; Draetta, G. (1992). Cyclins and related kinases in cancer. &#039;&#039;Advances in Cancer Research&#039;&#039;, 59, 1-32.<br /> * Yang, R., &amp; Morosetti, R. (1999). Cyclin A1 in acute myeloid leukemia. &#039;&#039;Leukemia&#039;&#039;, 13(5), 770-775.<br /> <br /> == External Links ==<br /> * [https://www.ncbi.nlm.nih.gov/gene/8900 Cyclin A1 Gene - NCBI]<br /> * [https://www.uniprot.org/uniprot/O96028 Cyclin A1 - UniProt]<br /> <br /> [[Category:Cell cycle regulators]]<br /> [[Category:Cyclins]]<br /> [[Category:Human proteins]]<br /> [[Category:Oncology]]</div>

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