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[[Berkas: 1tup.jpg|jmpl|300 px|Tumor suppressor p53 trimer + DNA fragment, Human.]]
'''p53''' ({{lang-en|protein 53, p53}}) adalah [[faktor transkripsi]] yang mendapat julukan dalam [[bahasa Inggris]] sebagai "''the guardian of the genome''", atau "''guardian angel gene''", dan "''master watchman''" karena peran [[protein]] tersebut dalam menjaga [[sel (biologi)|sel]] dari [[mutasi]] [[gen|genetik]]etik akibat kerusakan [[DNA]].
 
p53 memiliki [[ekspresi gen|ekspresi]] yang beragam seperti berbagai fungsi selularseluler, regulasi, [[apoptosis]], [[replikasi DNA]], [[proliferasi]], dll. Dalam kondisi normal, jumlah konsentrasi p53 dalam [[sitoplasma]] sangat sedikit dan hanya teraktivasi saat sel mengalami stress.<ref>{{en}} {{cite web
| url = http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2710969
| title = Watching the watcher: regulation of p53 by mitochondria
| accessdate = 2010-11-19
| work = Graduate Center for Toxicology, University of Kentucky; Aaron K Holley dan Daret K St Clair
}}</ref>
 
Rendahnya asupan [[asam folat]] dan [[vitamin B6]] dapat meningkatkan risiko mutasi genetik pada p53 dan menginduksi [[kanker usus besar]].<ref>{{en}} {{cite web
| url = http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2634965
| title = FOLATE AND VITAMIN B6 INTAKE AND RISK OF COLON CANCER IN RELATION TO P53 MUTATIONAL STATUS
| accessdate = 2010-12-12
| work = Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Ludwig Boltzmann-Institute for Applied Cancer Research, KFJ-Spital, Vienna, Austria and Applied Cancer Research - Institute for Translational Research Vienna (ACR–ITR VIEnna), Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Department of Medical Oncology, Dana-Farber Cancer Institute; Eva S. Schernhammer, MD, DrPH, Shuji Ogino, MD, PhD, dan Charles S. Fuchs, MD, MPH
}}</ref> Upregulasi p53 yang berlebihan, biasanya terjadi pada kasus [[kemoterapi]] [[kanker]] dengan penggunaan ''[[cisplatin]]'', dapat meracuni [[ginjal]], dan perlu diturunkan segera, misalnya dengan penggunaan ''pifithrin-α''.<ref>{{en}} {{cite web
| url = http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2792752/pdf/nihms159739.pdf
| title = Activation and involvement of p53 in cisplatin-induced nephrotoxicity
| accessdate = 2010-12-12
| work = Department of Cellular Biology and Anatomy, Medical College of Georgia and Veterans Affairs
Medical Center, Department of Internal Medicine, University of Utah and Veterans Affairs Medical Center, Department of Internal Medicine, University of Arkansas for Medical Sciences; Qingqing Wei, Guie Dong, Tianxin Yang, Judit Megyesi, Peter M. Price, dan Zheng Dong
}}</ref>
 
== Rujukan ==
{{Commonscat|Tumor suppressor protein p53}}
{{reflist}}
 
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[[Kategori:Faktor transkripsi]]
 
 
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