Oct4

Oct4（八聚體結合轉錄因子4, octamer-binding transcription factor 4）,亦稱爲POU5F1（第五類POU結構域轉錄因子1），化學式為：C₁₇₁₈H₂₆₅₇O₅₁₇N₄₆₉S₁₃，是一種蛋白質，在人體中由POU5F1基因編碼。Oct4是一種具有與POU結構域同源的結構域的轉錄因子。Oct4對未分化的胚胎幹細胞的自我更新與幹性維持至關重要。也正因如此，有時Oct4會被用來作標記未分化細胞的分子標記。Oct4的過表達或低表達都會造成細胞的分化，因此Oct4隻在特定的表達強度下才能維持細胞的幹性。

Oct4（八聚體結合轉錄因子4）名稱中的「八聚體」（octamer）指DNA核苷酸序列「ATTTGCAT」。

參見

• Sox2
• Nanog
• 八聚體轉錄因子

拓展閱讀

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• Gerrard L, Zhao D, Clark AJ, Cui W. Stably transfected human embryonic stem cell clones express OCT4-specific green fluorescent protein and maintain self-renewal and pluripotency. Stem Cells. 2005, 23 (1): 124–33. PMID 15625129. doi:10.1634/stemcells.2004-0102. 
• Reményi A, Lins K, Nissen LJ, Reinbold R, Schöler HR, Wilmanns M. Crystal structure of a POU/HMG/DNA ternary complex suggests differential assembly of Oct4 and Sox2 on two enhancers. Genes & Development. Aug 2003, 17 (16): 2048–59. PMC 196258 可免費查閱. PMID 12923055. doi:10.1101/gad.269303. 
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• Wey E, Lyons GE, Schäfer BW. A human POU domain gene, mPOU, is expressed in developing brain and specific adult tissues. European Journal of Biochemistry / FEBS. Mar 1994, 220 (3): 753–62. PMID 7908264. doi:10.1111/j.1432-1033.1994.tb18676.x. 
• Crouau-Roy B, Amadou C, Bouissou C, Clayton J, Vernet C, Ribouchon MT, Pontarotti P. Localization of the OTF3 gene within the human MHC class I region by physical and meiotic mapping. Genomics. May 1994, 21 (1): 241–3. PMID 8088794. doi:10.1006/geno.1994.1249. 
• Guillaudeux T, Mattei MG, Depetris D, Le Bouteiller P, Pontarotti P. In situ hybridization localizes the human OTF3 to chromosome 6p21.3-->p22 and OTF3L to 12p13. Cytogenetics and Cell Genetics. 1993, 63 (4): 212–4. PMID 8500351. doi:10.1159/000133537. 
• Abdel-Rahman B, Fiddler M, Rappolee D, Pergament E. Expression of transcription regulating genes in human preimplantation embryos. Human Reproduction. Oct 1995, 10 (10): 2787–92. PMID 8567814. 
• Hillier LD, Lennon G, Becker M, Bonaldo MF, Chiapelli B, Chissoe S, Dietrich N, DuBuque T, Favello A, Gish W, Hawkins M, Hultman M, Kucaba T, Lacy M, Le M, Le N, Mardis E, Moore B, Morris M, Parsons J, Prange C, Rifkin L, Rohlfing T, Schellenberg K, Bento Soares M, Tan F, Thierry-Meg J, Trevaskis E, Underwood K, Wohldman P, Waterston R, Wilson R, Marra M. Generation and analysis of 280,000 human expressed sequence tags. Genome Research. Sep 1996, 6 (9): 807–28. PMID 8889549. doi:10.1101/gr.6.9.807. 
• Inamoto S, Segil N, Pan ZQ, Kimura M, Roeder RG. The cyclin-dependent kinase-activating kinase (CAK) assembly factor, MAT1, targets and enhances CAK activity on the POU domains of octamer transcription factors. The Journal of Biological Chemistry. Nov 1997, 272 (47): 29852–8. PMID 9368058. doi:10.1074/jbc.272.47.29852. 
• Nichols J, Zevnik B, Anastassiadis K, Niwa H, Klewe-Nebenius D, Chambers I, Schöler H, Smith A. Formation of pluripotent stem cells in the mammalian embryo depends on the POU transcription factor Oct4. Cell. Oct 1998, 95 (3): 379–91. PMID 9814708. doi:10.1016/S0092-8674(00)81769-9. 
• Gonzalez MI, Robins DM. Oct-1 preferentially interacts with androgen receptor in a DNA-dependent manner that facilitates recruitment of SRC-1. The Journal of Biological Chemistry. Mar 2001, 276 (9): 6420–8. PMID 11096094. doi:10.1074/jbc.M008689200. 
• Butteroni C, De Felici M, Schöler HR, Pesce M. Phage display screening reveals an association between germline-specific transcription factor Oct-4 and multiple cellular proteins. Journal of Molecular Biology. Dec 2000, 304 (4): 529–40. PMID 11099378. doi:10.1006/jmbi.2000.4238. 
• Ezashi T, Ghosh D, Roberts RM. Repression of Ets-2-induced transactivation of the tau interferon promoter by Oct-4. Molecular and Cellular Biology. Dec 2001, 21 (23): 7883–91. PMC 99954 可免費查閱. PMID 11689681. doi:10.1128/MCB.21.23.7883-7891.2001. 
• Guo Y, Costa R, Ramsey H, Starnes T, Vance G, Robertson K, Kelley M, Reinbold R, Scholer H, Hromas R. The embryonic stem cell transcription factors Oct-4 and FoxD3 interact to regulate endodermal-specific promoter expression. Proceedings of the National Academy of Sciences of the United States of America. Mar 2002, 99 (6): 3663–7. PMC 122580 可免費查閱. PMID 11891324. doi:10.1073/pnas.062041099. 
• Looijenga LH, Stoop H, de Leeuw HP, de Gouveia Brazao CA, Gillis AJ, van Roozendaal KE, van Zoelen EJ, Weber RF, Wolffenbuttel KP, van Dekken H, Honecker F, Bokemeyer C, Perlman EJ, Schneider DT, Kononen J, Sauter G, Oosterhuis JW. POU5F1 (OCT3/4) identifies cells with pluripotent potential in human germ cell tumors. Cancer Research. May 2003, 63 (9): 2244–50. PMID 12727846. 
• Wang P, Branch DR, Bali M, Schultz GA, Goss PE, Jin T. The POU homeodomain protein OCT3 as a potential transcriptional activator for fibroblast growth factor-4 (FGF-4) in human breast cancer cells. The Biochemical Journal. Oct 2003, 375 (Pt 1): 199–205. PMC 1223663 可免費查閱. PMID 12841847. doi:10.1042/BJ20030579. 
• Reményi A, Lins K, Nissen LJ, Reinbold R, Schöler HR, Wilmanns M. Crystal structure of a POU/HMG/DNA ternary complex suggests differential assembly of Oct4 and Sox2 on two enhancers. Genes & Development. Aug 2003, 17 (16): 2048–59. PMC 196258 可免費查閱. PMID 12923055. doi:10.1101/gad.269303. 
• Rajpert-De Meyts E, Hanstein R, Jørgensen N, Graem N, Vogt PH, Skakkebaek NE. Developmental expression of POU5F1 (OCT-3/4) in normal and dysgenetic human gonads. Human Reproduction. Jun 2004, 19 (6): 1338–44. PMID 15105401. doi:10.1093/humrep/deh265. 
• Matin MM, Walsh JR, Gokhale PJ, Draper JS, Bahrami AR, Morton I, Moore HD, Andrews PW. Specific knockdown of Oct4 and beta2-microglobulin expression by RNA interference in human embryonic stem cells and embryonic carcinoma cells. Stem Cells. 2005, 22 (5): 659–68. PMID 15342930. doi:10.1634/stemcells.22-5-659. 
• Baal N, Reisinger K, Jahr H, Bohle RM, Liang O, Münstedt K, Rao CV, Preissner KT, Zygmunt MT. Expression of transcription factor Oct-4 and other embryonic genes in CD133 positive cells from human umbilical cord blood. Thrombosis and Haemostasis. Oct 2004, 92 (4): 767–75. PMID 15467907. doi:10.1160/TH04-02-0079. 

外部連結

• 醫學主題詞表（MeSH）：Oct-4+Transcription+Factor
• FactorBook POU5F1
• Generating iPS Cells from MEFS through Forced Expression of Sox-2, Oct-4, c-Myc, and Klf4（頁面存檔備份，存於網際網路檔案館）