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==Expression and function==
==Expression and function==


Oct-4 transcription factor is initially active as a [[maternal effect|maternal factor]] in the [[oocyte]] and remains active in embryos throughout the preimplantation period. Oct-4 expression is associated with an undifferentiated phenotype and tumors.<ref>{{cite journal | vauthors = 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 | title = POU5F1 (OCT3/4) identifies cells with pluripotent potential in human germ cell tumors | journal = Cancer Research | volume = 63 | issue = 9 | pages = 2244–50 | date = May 2003 | pmid = 12727846 }}</ref> Gene knockdown of Oct-4 promotes [[cellular differentiation|differentiation]], demonstrating a role for these factors in human embryonic stem cell self-renewal.<ref>{{cite journal | vauthors = Zaehres H, Lensch MW, Daheron L, Stewart SA, Itskovitz-Eldor J, Daley GQ | title = High-efficiency RNA interference in human embryonic stem cells | journal = Stem Cells | volume = 23 | issue = 3 | pages = 299–305 | date = March 2005 | pmid = 15749924 | doi = 10.1634/stemcells.2004-0252 }}</ref> Oct-4 can form a heterodimer with [[Sox2]], so that these two proteins bind DNA together.<ref name=Rodda2005>{{cite journal | vauthors = Rodda DJ, Chew JL, Lim LH, Loh YH, Wang B, Ng HH, Robson P | title = Transcriptional regulation of nanog by OCT4 and SOX2 | journal = The Journal of Biological Chemistry | volume = 280 | issue = 26 | pages = 24731–7 | date = July 2005 | pmid = 15860457 | doi = 10.1074/jbc.M502573200 }}</ref>
Oct-4 transcription factor is initially active as a [[maternal effect|maternal factor]] in the [[oocyte]] and remains active in embryos throughout the preimplantation period. Oct-4 expression is associated with an undifferentiated phenotype and tumors.<ref>{{cite journal | vauthors = 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 | title = POU5F1 (OCT3/4) identifies cells with pluripotent potential in human germ cell tumors | journal = Cancer Research | volume = 63 | issue = 9 | pages = 2244–50 | date = May 2003 | pmid = 12727846 }}</ref> Gene knockdown of Oct-4 promotes [[cellular differentiation|differentiation]], demonstrating a role for these factors in human embryonic stem cell self-renewal.<ref>{{cite journal | vauthors = Zaehres H, Lensch MW, Daheron L, Stewart SA, Itskovitz-Eldor J, Daley GQ | title = High-efficiency RNA interference in human embryonic stem cells | journal = Stem Cells | volume = 23 | issue = 3 | pages = 299–305 | date = March 2005 | pmid = 15749924 | doi = 10.1634/stemcells.2004-0252 }}</ref> Oct-4 can form a heterodimer with [[Sox2]], so that these two proteins bind DNA together.<ref name=Rodda2005>{{cite journal | vauthors = Rodda DJ, Chew JL, Lim LH, Loh YH, Wang B, Ng HH, Robson P | title = Transcriptional regulation of nanog by OCT4 and SOX2 | journal = The Journal of Biological Chemistry | volume = 280 | issue = 26 | pages = 24731–7 | date = July 2005 | pmid = 15860457 | doi = 10.1074/jbc.M502573200 | doi-access = free }}</ref>


Mouse embryos that are Oct-4 deficient or have low expression levels of Oct-4 fail to form the [[inner cell mass]], lose [[pluripotency]], and differentiate into [[trophectoderm]]. Therefore, the level of Oct-4 expression in mice is vital for regulating pluripotency and early cell differentiation since one of its main functions is to keep the embryo from differentiating.
Mouse embryos that are Oct-4 deficient or have low expression levels of Oct-4 fail to form the [[inner cell mass]], lose [[pluripotency]], and differentiate into [[trophectoderm]]. Therefore, the level of Oct-4 expression in mice is vital for regulating pluripotency and early cell differentiation since one of its main functions is to keep the embryo from differentiating.
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==Role in reprogramming==
==Role in reprogramming==


Oct-4 is one of the transcription factors used to create [[induced pluripotent stem cell]]s (iPSCs), together with [[Sox2]], [[Kruppel-like factors|Klf4]] and often c-[[Myc]] (OSKM) in mouse,<ref>{{cite journal | vauthors = Okita K, Ichisaka T, Yamanaka S | title = Generation of germline-competent induced pluripotent stem cells | journal = Nature | volume = 448 | issue = 7151 | pages = 313–7 | date = July 2007 | pmid = 17554338 | doi = 10.1038/nature05934 }}</ref><ref>{{cite journal | vauthors = Wernig M, Meissner A, Foreman R, Brambrink T, Ku M, Hochedlinger K, Bernstein BE, Jaenisch R | title = In vitro reprogramming of fibroblasts into a pluripotent ES-cell-like state | journal = Nature | volume = 448 | issue = 7151 | pages = 318–24 | date = July 2007 | pmid = 17554336 | doi = 10.1038/nature05944 }}</ref><ref>{{cite journal | vauthors = Maherali N, Sridharan R, Xie W, Utikal J, Eminli S, Arnold K, Stadtfeld M, Yachechko R, Tchieu J, Jaenisch R, Plath K, Hochedlinger K | title = Directly reprogrammed fibroblasts show global epigenetic remodeling and widespread tissue contribution | journal = Cell Stem Cell | volume = 1 | issue = 1 | pages = 55–70 | date = June 2007 | pmid = 18371336 | doi = 10.1016/j.stem.2007.05.014 }}</ref> demonstrating its capacity to induce an embryonic stem cell-like state. These factors are often referred to as "Yamanaka reprogramming factors". This reprogramming effect has also been seen with the [[Thomson reprogramming factors]], reverting human fibroblast cells to iPSCs through Oct-4, along with Sox2, [[Homeobox protein NANOG|Nanog]], and [[Lin28]]. The use of Thomson reprogramming factors avoids the need to overexpress c-Myc, an oncogene.<ref>{{cite journal | vauthors = Yu J, Vodyanik MA, Smuga-Otto K, Antosiewicz-Bourget J, Frane JL, Tian S, Nie J, Jonsdottir GA, Ruotti V, Stewart R, Slukvin II, Thomson JA | title = Induced pluripotent stem cell lines derived from human somatic cells | journal = Science | volume = 318 | issue = 5858 | pages = 1917–20 | date = December 2007 | pmid = 18029452 | doi = 10.1126/science.1151526 }}</ref> It was later determined that only two of these four factors, Oct4 and Klf4, were sufficient to reprogram mouse adult neural stem cells.<ref name="pmid18594515">{{cite journal | vauthors = Kim JB, Zaehres H, Wu G, Gentile L, Ko K, Sebastiano V, Araúzo-Bravo MJ, Ruau D, Han DW, Zenke M, Schöler HR | title = Pluripotent stem cells induced from adult neural stem cells by reprogramming with two factors | journal = Nature | volume = 454 | issue = 7204 | pages = 646–50 | date = July 2008 | pmid = 18594515 | doi = 10.1038/nature07061 }}</ref> Finally it was shown that a single factor, Oct-4 was sufficient for this transformation.<ref name="Kim_2009">{{cite journal | vauthors = Kim JB, Sebastiano V, Wu G, Araúzo-Bravo MJ, Sasse P, Gentile L, Ko K, Ruau D, Ehrich M, van den Boom D, Meyer J, Hübner K, Bernemann C, Ortmeier C, Zenke M, Fleischmann BK, Zaehres H, Schöler HR | title = Oct4-induced pluripotency in adult neural stem cells | journal = Cell | volume = 136 | issue = 3 | pages = 411–9 | date = February 2009 | pmid = 19203577 | doi = 10.1016/j.cell.2009.01.023 }}</ref> Moreover, while Sox2, Klf4, and cMyc could be replaced by their respective family members,Oct4's closer relatives, [[POU2F1|Oct1]] and [[Oct6]], fail to induce pluripotency, thus demonstrating the exclusiveness of Oct4 among POU transcription factors.<ref>{{cite journal | vauthors = Nakagawa M, Koyanagi M, Tanabe K, Takahashi K, Ichisaka T, Aoi T, Okita K, Mochiduki Y, Takizawa N, Yamanaka S | display-authors = 6 | title = Generation of induced pluripotent stem cells without Myc from mouse and human fibroblasts | journal = Nature Biotechnology | volume = 26 | issue = 1 | pages = 101–6 | date = January 2008 | pmid = 18059259 | doi = 10.1038/nbt1374 }}</ref> However, later it was shown that Oct4 could be completely omitted from Yamanaka cocktail, and the remaining three factors, Sox2, Klf4, and cMyc (SKM) could generate mouse iPSCs with dramatically enhanced developmental potential.<ref>{{cite journal | vauthors = Velychko S, Adachi K, Kim KP, Hou Y, MacCarthy CM, Wu G, Schöler HR | title = Excluding Oct4 from Yamanaka Cocktail Unleashes the Developmental Potential of iPSCs | journal = Cell Stem Cell | volume = 25 | issue = 6 | pages = 737–753.e4 | date = December 2019 | pmid = 31708402 | doi = 10.1016/j.stem.2019.10.002 }}</ref> This suggests that Oct4 increases the efficiency of reprogramming, but decreases the quality of resulting iPSCs.
Oct-4 is one of the transcription factors used to create [[induced pluripotent stem cell]]s (iPSCs), together with [[Sox2]], [[Kruppel-like factors|Klf4]] and often c-[[Myc]] (OSKM) in mouse,<ref>{{cite journal | vauthors = Okita K, Ichisaka T, Yamanaka S | title = Generation of germline-competent induced pluripotent stem cells | journal = Nature | volume = 448 | issue = 7151 | pages = 313–7 | date = July 2007 | pmid = 17554338 | doi = 10.1038/nature05934 }}</ref><ref>{{cite journal | vauthors = Wernig M, Meissner A, Foreman R, Brambrink T, Ku M, Hochedlinger K, Bernstein BE, Jaenisch R | title = In vitro reprogramming of fibroblasts into a pluripotent ES-cell-like state | journal = Nature | volume = 448 | issue = 7151 | pages = 318–24 | date = July 2007 | pmid = 17554336 | doi = 10.1038/nature05944 }}</ref><ref>{{cite journal | vauthors = Maherali N, Sridharan R, Xie W, Utikal J, Eminli S, Arnold K, Stadtfeld M, Yachechko R, Tchieu J, Jaenisch R, Plath K, Hochedlinger K | title = Directly reprogrammed fibroblasts show global epigenetic remodeling and widespread tissue contribution | journal = Cell Stem Cell | volume = 1 | issue = 1 | pages = 55–70 | date = June 2007 | pmid = 18371336 | doi = 10.1016/j.stem.2007.05.014 }}</ref> demonstrating its capacity to induce an embryonic stem cell-like state. These factors are often referred to as "Yamanaka reprogramming factors". This reprogramming effect has also been seen with the [[Thomson reprogramming factors]], reverting human fibroblast cells to iPSCs through Oct-4, along with Sox2, [[Homeobox protein NANOG|Nanog]], and [[Lin28]]. The use of Thomson reprogramming factors avoids the need to overexpress c-Myc, an oncogene.<ref>{{cite journal | vauthors = Yu J, Vodyanik MA, Smuga-Otto K, Antosiewicz-Bourget J, Frane JL, Tian S, Nie J, Jonsdottir GA, Ruotti V, Stewart R, Slukvin II, Thomson JA | title = Induced pluripotent stem cell lines derived from human somatic cells | journal = Science | volume = 318 | issue = 5858 | pages = 1917–20 | date = December 2007 | pmid = 18029452 | doi = 10.1126/science.1151526 }}</ref> It was later determined that only two of these four factors, Oct4 and Klf4, were sufficient to reprogram mouse adult neural stem cells.<ref name="pmid18594515">{{cite journal | vauthors = Kim JB, Zaehres H, Wu G, Gentile L, Ko K, Sebastiano V, Araúzo-Bravo MJ, Ruau D, Han DW, Zenke M, Schöler HR | title = Pluripotent stem cells induced from adult neural stem cells by reprogramming with two factors | journal = Nature | volume = 454 | issue = 7204 | pages = 646–50 | date = July 2008 | pmid = 18594515 | doi = 10.1038/nature07061 }}</ref> Finally it was shown that a single factor, Oct-4 was sufficient for this transformation.<ref name="Kim_2009">{{cite journal | vauthors = Kim JB, Sebastiano V, Wu G, Araúzo-Bravo MJ, Sasse P, Gentile L, Ko K, Ruau D, Ehrich M, van den Boom D, Meyer J, Hübner K, Bernemann C, Ortmeier C, Zenke M, Fleischmann BK, Zaehres H, Schöler HR | title = Oct4-induced pluripotency in adult neural stem cells | journal = Cell | volume = 136 | issue = 3 | pages = 411–9 | date = February 2009 | pmid = 19203577 | doi = 10.1016/j.cell.2009.01.023 }}</ref> Moreover, while Sox2, Klf4, and cMyc could be replaced by their respective family members,Oct4's closer relatives, [[POU2F1|Oct1]] and [[Oct6]], fail to induce pluripotency, thus demonstrating the exclusiveness of Oct4 among POU transcription factors.<ref>{{cite journal | vauthors = Nakagawa M, Koyanagi M, Tanabe K, Takahashi K, Ichisaka T, Aoi T, Okita K, Mochiduki Y, Takizawa N, Yamanaka S | display-authors = 6 | title = Generation of induced pluripotent stem cells without Myc from mouse and human fibroblasts | journal = Nature Biotechnology | volume = 26 | issue = 1 | pages = 101–6 | date = January 2008 | pmid = 18059259 | doi = 10.1038/nbt1374 }}</ref> However, later it was shown that Oct4 could be completely omitted from Yamanaka cocktail, and the remaining three factors, Sox2, Klf4, and cMyc (SKM) could generate mouse iPSCs with dramatically enhanced developmental potential.<ref>{{cite journal | vauthors = Velychko S, Adachi K, Kim KP, Hou Y, MacCarthy CM, Wu G, Schöler HR | title = Excluding Oct4 from Yamanaka Cocktail Unleashes the Developmental Potential of iPSCs | journal = Cell Stem Cell | volume = 25 | issue = 6 | pages = 737–753.e4 | date = December 2019 | pmid = 31708402 | doi = 10.1016/j.stem.2019.10.002 | doi-access = free }}</ref> This suggests that Oct4 increases the efficiency of reprogramming, but decreases the quality of resulting iPSCs.


==In embryonic stem cells==
==In embryonic stem cells==
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Several studies suggest a role for Oct-4 in sustaining self-renewal capacity of [[adult stem cell|adult somatic stem cells]] (i.e. stem cells from epithelium, bone marrow, liver, etc.).<ref name="pmid15513931">For example:
Several studies suggest a role for Oct-4 in sustaining self-renewal capacity of [[adult stem cell|adult somatic stem cells]] (i.e. stem cells from epithelium, bone marrow, liver, etc.).<ref name="pmid15513931">For example:
* {{cite journal | vauthors = Tai MH, Chang CC, Kiupel M, Webster JD, Olson LK, Trosko JE | title = Oct4 expression in adult human stem cells: evidence in support of the stem cell theory of carcinogenesis | journal = Carcinogenesis | volume = 26 | issue = 2 | pages = 495–502 | date = February 2005 | pmid = 15513931 | doi = 10.1093/carcin/bgh321 }}
* {{cite journal | vauthors = Tai MH, Chang CC, Kiupel M, Webster JD, Olson LK, Trosko JE | title = Oct4 expression in adult human stem cells: evidence in support of the stem cell theory of carcinogenesis | journal = Carcinogenesis | volume = 26 | issue = 2 | pages = 495–502 | date = February 2005 | pmid = 15513931 | doi = 10.1093/carcin/bgh321 | doi-access = free }}
* {{cite journal | vauthors = Kim JH, Jee MK, Lee SY, Han TH, Kim BS, Kang KS, Kang SK | title = Regulation of adipose tissue stromal cells behaviors by endogenic Oct4 expression control | journal = PLOS ONE | volume = 4 | issue = 9 | pages = e7166 | date = September 2009 | pmid = 19777066 | pmc = 2747014 | doi = 10.1371/journal.pone.0007166 | editor1-last = Mei | editor1-first = Lin }}</ref> Other scientists have produced evidence to the contrary,<ref>{{cite journal | vauthors = Lengner CJ, Camargo FD, Hochedlinger K, Welstead GG, Zaidi S, Gokhale S, Scholer HR, Tomilin A, Jaenisch R | title = Oct4 expression is not required for mouse somatic stem cell self-renewal | journal = Cell Stem Cell | volume = 1 | issue = 4 | pages = 403–15 | date = October 2007 | pmid = 18159219 | pmc = 2151746 | doi = 10.1016/j.stem.2007.07.020 }}</ref> and dismiss those studies as artifacts of ''in vitro'' culture, or interpreting background noise as signal,<ref>{{cite journal | vauthors = Lengner CJ, Welstead GG, Jaenisch R | title = The pluripotency regulator Oct4: a role in somatic stem cells? | journal = Cell Cycle | volume = 7 | issue = 6 | pages = 725–8 | date = March 2008 | pmid = 18239456 | doi = 10.4161/cc.7.6.5573 | url = http://www.landesbioscience.com/journals/cc/article/5573/ }}</ref> and warn about Oct-4 [[pseudogene]]s giving false detection of Oct-4 expression.<ref name="pmid17379765">{{cite journal | vauthors = Zangrossi S, Marabese M, Broggini M, Giordano R, D'Erasmo M, Montelatici E, Intini D, Neri A, Pesce M, Rebulla P, Lazzari L | title = Oct-4 expression in adult human differentiated cells challenges its role as a pure stem cell marker | journal = Stem Cells | volume = 25 | issue = 7 | pages = 1675–80 | date = July 2007 | pmid = 17379765 | doi = 10.1634/stemcells.2006-0611 }}</ref>
* {{cite journal | vauthors = Kim JH, Jee MK, Lee SY, Han TH, Kim BS, Kang KS, Kang SK | title = Regulation of adipose tissue stromal cells behaviors by endogenic Oct4 expression control | journal = PLOS ONE | volume = 4 | issue = 9 | pages = e7166 | date = September 2009 | pmid = 19777066 | pmc = 2747014 | doi = 10.1371/journal.pone.0007166 | editor1-last = Mei | editor1-first = Lin }}</ref> Other scientists have produced evidence to the contrary,<ref>{{cite journal | vauthors = Lengner CJ, Camargo FD, Hochedlinger K, Welstead GG, Zaidi S, Gokhale S, Scholer HR, Tomilin A, Jaenisch R | title = Oct4 expression is not required for mouse somatic stem cell self-renewal | journal = Cell Stem Cell | volume = 1 | issue = 4 | pages = 403–15 | date = October 2007 | pmid = 18159219 | pmc = 2151746 | doi = 10.1016/j.stem.2007.07.020 }}</ref> and dismiss those studies as artifacts of ''in vitro'' culture, or interpreting background noise as signal,<ref>{{cite journal | vauthors = Lengner CJ, Welstead GG, Jaenisch R | title = The pluripotency regulator Oct4: a role in somatic stem cells? | journal = Cell Cycle | volume = 7 | issue = 6 | pages = 725–8 | date = March 2008 | pmid = 18239456 | doi = 10.4161/cc.7.6.5573 | url = http://www.landesbioscience.com/journals/cc/article/5573/ | doi-access = free }}</ref> and warn about Oct-4 [[pseudogene]]s giving false detection of Oct-4 expression.<ref name="pmid17379765">{{cite journal | vauthors = Zangrossi S, Marabese M, Broggini M, Giordano R, D'Erasmo M, Montelatici E, Intini D, Neri A, Pesce M, Rebulla P, Lazzari L | title = Oct-4 expression in adult human differentiated cells challenges its role as a pure stem cell marker | journal = Stem Cells | volume = 25 | issue = 7 | pages = 1675–80 | date = July 2007 | pmid = 17379765 | doi = 10.1634/stemcells.2006-0611 }}</ref>
Oct-4 has also been implicated as a marker of [[cancer stem cell]]s.<ref>{{cite journal | vauthors = Kim RJ, Nam JS | title = OCT4 Expression Enhances Features of Cancer Stem Cells in a Mouse Model of Breast Cancer | journal = Laboratory Animal Research | volume = 27 | issue = 2 | pages = 147–52 | date = June 2011 | pmid = 21826175 | pmc = 3145994 | doi = 10.5625/lar.2011.27.2.147 }}</ref><ref>{{cite journal | vauthors = Atlasi Y, Mowla SJ, Ziaee SA, Bahrami AR | title = OCT-4, an embryonic stem cell marker, is highly expressed in bladder cancer | journal = International Journal of Cancer | volume = 120 | issue = 7 | pages = 1598–602 | date = April 2007 | pmid = 17205510 | doi = 10.1002/ijc.22508 }}</ref>
Oct-4 has also been implicated as a marker of [[cancer stem cell]]s.<ref>{{cite journal | vauthors = Kim RJ, Nam JS | title = OCT4 Expression Enhances Features of Cancer Stem Cells in a Mouse Model of Breast Cancer | journal = Laboratory Animal Research | volume = 27 | issue = 2 | pages = 147–52 | date = June 2011 | pmid = 21826175 | pmc = 3145994 | doi = 10.5625/lar.2011.27.2.147 }}</ref><ref>{{cite journal | vauthors = Atlasi Y, Mowla SJ, Ziaee SA, Bahrami AR | title = OCT-4, an embryonic stem cell marker, is highly expressed in bladder cancer | journal = International Journal of Cancer | volume = 120 | issue = 7 | pages = 1598–602 | date = April 2007 | pmid = 17205510 | doi = 10.1002/ijc.22508 }}</ref>


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* {{cite journal | vauthors = Guillaudeux T, Mattei MG, Depetris D, Le Bouteiller P, Pontarotti P | title = In situ hybridization localizes the human OTF3 to chromosome 6p21.3-->p22 and OTF3L to 12p13 | journal = Cytogenetics and Cell Genetics | volume = 63 | issue = 4 | pages = 212–4 | year = 1993 | pmid = 8500351 | doi = 10.1159/000133537 }}
* {{cite journal | vauthors = Guillaudeux T, Mattei MG, Depetris D, Le Bouteiller P, Pontarotti P | title = In situ hybridization localizes the human OTF3 to chromosome 6p21.3-->p22 and OTF3L to 12p13 | journal = Cytogenetics and Cell Genetics | volume = 63 | issue = 4 | pages = 212–4 | year = 1993 | pmid = 8500351 | doi = 10.1159/000133537 }}
* {{cite journal | vauthors = Abdel-Rahman B, Fiddler M, Rappolee D, Pergament E | title = Expression of transcription regulating genes in human preimplantation embryos | journal = Human Reproduction | volume = 10 | issue = 10 | pages = 2787–92 | date = October 1995 | pmid = 8567814 | doi = 10.1093/oxfordjournals.humrep.a135792 }}
* {{cite journal | vauthors = Abdel-Rahman B, Fiddler M, Rappolee D, Pergament E | title = Expression of transcription regulating genes in human preimplantation embryos | journal = Human Reproduction | volume = 10 | issue = 10 | pages = 2787–92 | date = October 1995 | pmid = 8567814 | doi = 10.1093/oxfordjournals.humrep.a135792 }}
* {{cite journal | vauthors = 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 | title = Generation and analysis of 280,000 human expressed sequence tags | journal = Genome Research | volume = 6 | issue = 9 | pages = 807–28 | date = September 1996 | pmid = 8889549 | doi = 10.1101/gr.6.9.807 }}
* {{cite journal | vauthors = 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 | title = Generation and analysis of 280,000 human expressed sequence tags | journal = Genome Research | volume = 6 | issue = 9 | pages = 807–28 | date = September 1996 | pmid = 8889549 | doi = 10.1101/gr.6.9.807 | doi-access = free }}
* {{cite journal | vauthors = Inamoto S, Segil N, Pan ZQ, Kimura M, Roeder RG | title = The cyclin-dependent kinase-activating kinase (CAK) assembly factor, MAT1, targets and enhances CAK activity on the POU domains of octamer transcription factors | journal = The Journal of Biological Chemistry | volume = 272 | issue = 47 | pages = 29852–8 | date = November 1997 | pmid = 9368058 | doi = 10.1074/jbc.272.47.29852 }}
* {{cite journal | vauthors = Inamoto S, Segil N, Pan ZQ, Kimura M, Roeder RG | title = The cyclin-dependent kinase-activating kinase (CAK) assembly factor, MAT1, targets and enhances CAK activity on the POU domains of octamer transcription factors | journal = The Journal of Biological Chemistry | volume = 272 | issue = 47 | pages = 29852–8 | date = November 1997 | pmid = 9368058 | doi = 10.1074/jbc.272.47.29852 | doi-access = free }}
* {{cite journal | vauthors = Nichols J, Zevnik B, Anastassiadis K, Niwa H, Klewe-Nebenius D, Chambers I, Schöler H, Smith A | title = Formation of pluripotent stem cells in the mammalian embryo depends on the POU transcription factor Oct4 | journal = Cell | volume = 95 | issue = 3 | pages = 379–91 | date = October 1998 | pmid = 9814708 | doi = 10.1016/S0092-8674(00)81769-9 }}
* {{cite journal | vauthors = Nichols J, Zevnik B, Anastassiadis K, Niwa H, Klewe-Nebenius D, Chambers I, Schöler H, Smith A | title = Formation of pluripotent stem cells in the mammalian embryo depends on the POU transcription factor Oct4 | journal = Cell | volume = 95 | issue = 3 | pages = 379–91 | date = October 1998 | pmid = 9814708 | doi = 10.1016/S0092-8674(00)81769-9 }}
* {{cite journal | vauthors = Gonzalez MI, Robins DM | title = Oct-1 preferentially interacts with androgen receptor in a DNA-dependent manner that facilitates recruitment of SRC-1 | journal = The Journal of Biological Chemistry | volume = 276 | issue = 9 | pages = 6420–8 | date = March 2001 | pmid = 11096094 | doi = 10.1074/jbc.M008689200 }}
* {{cite journal | vauthors = Gonzalez MI, Robins DM | title = Oct-1 preferentially interacts with androgen receptor in a DNA-dependent manner that facilitates recruitment of SRC-1 | journal = The Journal of Biological Chemistry | volume = 276 | issue = 9 | pages = 6420–8 | date = March 2001 | pmid = 11096094 | doi = 10.1074/jbc.M008689200 | doi-access = free }}
* {{cite journal | vauthors = Butteroni C, De Felici M, Schöler HR, Pesce M | title = Phage display screening reveals an association between germline-specific transcription factor Oct-4 and multiple cellular proteins | journal = Journal of Molecular Biology | volume = 304 | issue = 4 | pages = 529–40 | date = December 2000 | pmid = 11099378 | doi = 10.1006/jmbi.2000.4238 }}
* {{cite journal | vauthors = Butteroni C, De Felici M, Schöler HR, Pesce M | title = Phage display screening reveals an association between germline-specific transcription factor Oct-4 and multiple cellular proteins | journal = Journal of Molecular Biology | volume = 304 | issue = 4 | pages = 529–40 | date = December 2000 | pmid = 11099378 | doi = 10.1006/jmbi.2000.4238 }}
* {{cite journal | vauthors = Ezashi T, Ghosh D, Roberts RM | title = Repression of Ets-2-induced transactivation of the tau interferon promoter by Oct-4 | journal = Molecular and Cellular Biology | volume = 21 | issue = 23 | pages = 7883–91 | date = December 2001 | pmid = 11689681 | pmc = 99954 | doi = 10.1128/MCB.21.23.7883-7891.2001 }}
* {{cite journal | vauthors = Ezashi T, Ghosh D, Roberts RM | title = Repression of Ets-2-induced transactivation of the tau interferon promoter by Oct-4 | journal = Molecular and Cellular Biology | volume = 21 | issue = 23 | pages = 7883–91 | date = December 2001 | pmid = 11689681 | pmc = 99954 | doi = 10.1128/MCB.21.23.7883-7891.2001 }}
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* {{cite journal | vauthors = Wang P, Branch DR, Bali M, Schultz GA, Goss PE, Jin T | title = The POU homeodomain protein OCT3 as a potential transcriptional activator for fibroblast growth factor-4 (FGF-4) in human breast cancer cells | journal = The Biochemical Journal | volume = 375 | issue = Pt 1 | pages = 199–205 | date = October 2003 | pmid = 12841847 | pmc = 1223663 | doi = 10.1042/BJ20030579 }}
* {{cite journal | vauthors = Wang P, Branch DR, Bali M, Schultz GA, Goss PE, Jin T | title = The POU homeodomain protein OCT3 as a potential transcriptional activator for fibroblast growth factor-4 (FGF-4) in human breast cancer cells | journal = The Biochemical Journal | volume = 375 | issue = Pt 1 | pages = 199–205 | date = October 2003 | pmid = 12841847 | pmc = 1223663 | doi = 10.1042/BJ20030579 }}
* {{cite journal | vauthors = Reményi A, Lins K, Nissen LJ, Reinbold R, Schöler HR, Wilmanns M | title = Crystal structure of a POU/HMG/DNA ternary complex suggests differential assembly of Oct4 and Sox2 on two enhancers | journal = Genes & Development | volume = 17 | issue = 16 | pages = 2048–59 | date = August 2003 | pmid = 12923055 | pmc = 196258 | doi = 10.1101/gad.269303 }}
* {{cite journal | vauthors = Reményi A, Lins K, Nissen LJ, Reinbold R, Schöler HR, Wilmanns M | title = Crystal structure of a POU/HMG/DNA ternary complex suggests differential assembly of Oct4 and Sox2 on two enhancers | journal = Genes & Development | volume = 17 | issue = 16 | pages = 2048–59 | date = August 2003 | pmid = 12923055 | pmc = 196258 | doi = 10.1101/gad.269303 }}
* {{cite journal | vauthors = Rajpert-De Meyts E, Hanstein R, Jørgensen N, Graem N, Vogt PH, Skakkebaek NE | title = Developmental expression of POU5F1 (OCT-3/4) in normal and dysgenetic human gonads | journal = Human Reproduction | volume = 19 | issue = 6 | pages = 1338–44 | date = June 2004 | pmid = 15105401 | doi = 10.1093/humrep/deh265 }}
* {{cite journal | vauthors = Rajpert-De Meyts E, Hanstein R, Jørgensen N, Graem N, Vogt PH, Skakkebaek NE | title = Developmental expression of POU5F1 (OCT-3/4) in normal and dysgenetic human gonads | journal = Human Reproduction | volume = 19 | issue = 6 | pages = 1338–44 | date = June 2004 | pmid = 15105401 | doi = 10.1093/humrep/deh265 | doi-access = free }}
* {{cite journal | vauthors = Matin MM, Walsh JR, Gokhale PJ, Draper JS, Bahrami AR, Morton I, Moore HD, Andrews PW | title = Specific knockdown of Oct4 and beta2-microglobulin expression by RNA interference in human embryonic stem cells and embryonic carcinoma cells | journal = Stem Cells | volume = 22 | issue = 5 | pages = 659–68 | year = 2005 | pmid = 15342930 | doi = 10.1634/stemcells.22-5-659 }}
* {{cite journal | vauthors = Matin MM, Walsh JR, Gokhale PJ, Draper JS, Bahrami AR, Morton I, Moore HD, Andrews PW | title = Specific knockdown of Oct4 and beta2-microglobulin expression by RNA interference in human embryonic stem cells and embryonic carcinoma cells | journal = Stem Cells | volume = 22 | issue = 5 | pages = 659–68 | year = 2005 | pmid = 15342930 | doi = 10.1634/stemcells.22-5-659 }}
* {{cite journal | vauthors = Baal N, Reisinger K, Jahr H, Bohle RM, Liang O, Münstedt K, Rao CV, Preissner KT, Zygmunt MT | title = Expression of transcription factor Oct-4 and other embryonic genes in CD133 positive cells from human umbilical cord blood | journal = Thrombosis and Haemostasis | volume = 92 | issue = 4 | pages = 767–75 | date = October 2004 | pmid = 15467907 | doi = 10.1160/TH04-02-0079 }}
* {{cite journal | vauthors = Baal N, Reisinger K, Jahr H, Bohle RM, Liang O, Münstedt K, Rao CV, Preissner KT, Zygmunt MT | title = Expression of transcription factor Oct-4 and other embryonic genes in CD133 positive cells from human umbilical cord blood | journal = Thrombosis and Haemostasis | volume = 92 | issue = 4 | pages = 767–75 | date = October 2004 | pmid = 15467907 | doi = 10.1160/TH04-02-0079 }}

Revision as of 03:44, 18 April 2020

For the day, see October 4.
"Oct-3" redirects here. For the day, see October 3.
POU5F1
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesPOU5F1, OCT3, OCT4, OTF-3, OTF3, OTF4, Oct-3, Oct-4, POU class 5 homeobox 1, Oct3/4
External IDsOMIM: 164177; MGI: 101893; HomoloGene: 8422; GeneCards: POU5F1; OMA:POU5F1 - orthologs
Orthologs
SpeciesHumanMouse
Entrez

5460

18999

Ensembl

ENSMUSG00000024406

UniProt

Q01860

P20263

RefSeq (mRNA)

NM_203289
NM_001173531
NM_001285986
NM_001285987
NM_002701

NM_001252452
NM_013633

RefSeq (protein)

NP_001239381
NP_038661

Location (UCSC)Chr 6: 31.16 – 31.18 MbChr 17: 35.82 – 35.82 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Oct-4 (octamer-binding transcription factor 4), also known as POU5F1 (POU domain, class 5, transcription factor 1), is a protein that in humans is encoded by the POU5F1 gene.[5] Oct-4 is a homeodomain transcription factor of the POU family. It is critically involved in the self-renewal of undifferentiated embryonic stem cells.[6] As such, it is frequently used as a marker for undifferentiated cells. Oct-4 expression must be closely regulated; too much or too little will cause differentiation of the cells.[7]

Octamer-binding transcription factor 4, OCT-4, is a transcription factor protein that is encoded by the Pou5f1 gene and is part of the POU (Pit-Oct-Unc) family.[8] OCT-4 consists of an octamer motif, a particular DNA sequence of AGTCAAAT that binds to their target genes and activates or deactivates certain expressions. These gene expressions then lead to phenotypic changes in stem cell differentiation during the development of a mammalian embryo.[9] It plays a vital role in determining the fates of both inner mass cells and embryonic stem cells and has the ability to maintain pluripotency throughout embryonic development.[10] Recently, it has been noted that OCT-4 not only maintains pluripotency in embryonic cells but also has the ability to regulate cancer cell proliferation and can be found in various cancers such as pancreatic, lung, liver and testicular germ cell tumors in adult germ cells.[11] Another defect this gene can have is dysplastic growth in epithelial tissues which are caused by a lack of OCT-4 within the epithelial cells.[12]

Expression and function

Oct-4 transcription factor is initially active as a maternal factor in the oocyte and remains active in embryos throughout the preimplantation period. Oct-4 expression is associated with an undifferentiated phenotype and tumors.[13] Gene knockdown of Oct-4 promotes differentiation, demonstrating a role for these factors in human embryonic stem cell self-renewal.[14] Oct-4 can form a heterodimer with Sox2, so that these two proteins bind DNA together.[15]

Mouse embryos that are Oct-4 deficient or have low expression levels of Oct-4 fail to form the inner cell mass, lose pluripotency, and differentiate into trophectoderm. Therefore, the level of Oct-4 expression in mice is vital for regulating pluripotency and early cell differentiation since one of its main functions is to keep the embryo from differentiating.

Orthologs

Orthologs of Oct-4 in humans and other species include:

Species Entrez GeneID Chromosome Location RefSeq (mRNA) RefSeq (protein)
Mus musculus (mouse) 18999 17,17 B1; 17 19.23 cM NC_000083.4, 35114104..35118822 (Plus Strand) NM_013633.1 NP_038661.1
Homo sapiens (human) 5460 6, 6p21.31 NC_000006.10, 31246432-31240107 (Minus Strand) NM_002701.3 NP_002692.2 (full length isoform)
NP_002692.1 (N-terminal truncated isoform)
Rattus norvegicus (rat) 294562 20 NW_001084776, 650467-655015 (Minus strand) NM_001009178 NP_001009178
Danio rerio (zebrafish) 303333 21 NC_007127.1, 27995548-28000317 (Minus strand) NM_131112 NP_571187

Structure

Oct-4 contains the following protein domains:

Domain Description Length (AA)
POU domain Found in Pit-Oct-Unc transcription factors 75
Homeodomain DNA binding domains involved in the transcriptional regulation of key eukaryotic developmental processes; may bind to DNA as monomers or as homodimers and/or heterodimers in a sequence-specific manner. 59

Implications in disease

Oct-4 has been implicated in tumorigenesis of adult germ cells. Ectopic expression of the factor in adult mice has been found to cause the formation of dysplastic lesions of the skin and intestine. The intestinal dysplasia resulted from an increase in progenitor cell population and the upregulation of β-catenin transcription through the inhibition of cellular differentiation.[16]

Pluripotency in embryo development

Animal model

In 2000, Niwa et al. used conditional expression and repression in murine embryonic stem cells to determine requirements for Oct-4 in the maintenance of developmental potency.[7] Although transcriptional determination has often been considered as a binary on-off control system, they found that the precise level of Oct-4 governs 3 distinct fates of ES cells. An increase in expression of less than 2-fold causes differentiation into primitive endoderm and mesoderm. In contrast, repression of Oct-4 induces loss of pluripotency and dedifferentiation to trophectoderm. Thus, a critical amount of Oct-4 is required to sustain stem cell self-renewal, and up- or down-regulation induces divergent developmental programs. Changes to Oct-4 levels do not independently promote differentiation, but are also controlled by levels of Sox2. A decrease in Sox2 accompanies increased levels of Oct-4 to promote a mesendodermal fate, with Oct-4 actively inhibiting ectodermal differentiation. Repressed Oct-4 levels that lead to ectodermal differentiation are accompanied by an increase in Sox2, which effectively inhibits mesendodermal differentiation.[17] Niwa et al. suggested that their findings established a role for Oct-4 as a master regulator of pluripotency that controls lineage commitment and illustrated the sophistication of critical transcriptional regulators and the consequent importance of quantitative analyzes.

The transcription factors Oct-4, Sox2 and Nanog are part of a complex regulatory network with Oct-4 and Sox2 capable of directly regulating Nanog by binding to its promoter, and are essential for maintaining the self-renewing undifferentiated state of the inner cell mass of the blastocyst, embryonic stem cell lines[18] (which are cell lines derived from the inner cell mass), and induced pluripotent stem cells.[15] While differential up- and down-regulation of Oct-4 and Sox2 has been shown to promote differentiation, down-regulation of Nanog must occur for differentiation to proceed.[17]

Role in reprogramming

Oct-4 is one of the transcription factors used to create induced pluripotent stem cells (iPSCs), together with Sox2, Klf4 and often c-Myc (OSKM) in mouse,[19][20][21] demonstrating its capacity to induce an embryonic stem cell-like state. These factors are often referred to as "Yamanaka reprogramming factors". This reprogramming effect has also been seen with the Thomson reprogramming factors, reverting human fibroblast cells to iPSCs through Oct-4, along with Sox2, Nanog, and Lin28. The use of Thomson reprogramming factors avoids the need to overexpress c-Myc, an oncogene.[22] It was later determined that only two of these four factors, Oct4 and Klf4, were sufficient to reprogram mouse adult neural stem cells.[23] Finally it was shown that a single factor, Oct-4 was sufficient for this transformation.[24] Moreover, while Sox2, Klf4, and cMyc could be replaced by their respective family members,Oct4's closer relatives, Oct1 and Oct6, fail to induce pluripotency, thus demonstrating the exclusiveness of Oct4 among POU transcription factors.[25] However, later it was shown that Oct4 could be completely omitted from Yamanaka cocktail, and the remaining three factors, Sox2, Klf4, and cMyc (SKM) could generate mouse iPSCs with dramatically enhanced developmental potential.[26] This suggests that Oct4 increases the efficiency of reprogramming, but decreases the quality of resulting iPSCs.

In embryonic stem cells

  • In in vitro experiments of mouse embryonic stem cells, Oct-4 has often been used as a marker of stemness, as differentiated cells show reduced expression of this marker.
  • Oct3/4 can both repress and activate the promoter of Rex1. In cells that already express high level of Oct3/4, exogenously transfected Oct3/4 will lead to the repression of Rex1.[27] However, in cells that are not actively expressing Oct3/4, exogenous transfection of Oct3/4 will lead to the activation of Rex1.[27] This implies a dual regulatory ability of Oct3/4 on Rex1. At low levels of the Oct3/4 protein, the Rex1 promoter is activated, while at high levels of the Oct3/4 protein, the Rex1 promoter is repressed.
  • Oct4 contributes to the rapid cell cycle of ESCs by promoting progression through the G1 phase, specifically through transcriptional inhibition of cyclin-dependent kinase inhibitors such as p21.[28]
  • CRISPR-Cas9 knockout of the gene in human embryonic stem cells demonstrated that Oct-4 is essential for the development after fertilisation.[29]

In adult stem cells

Several studies suggest a role for Oct-4 in sustaining self-renewal capacity of adult somatic stem cells (i.e. stem cells from epithelium, bone marrow, liver, etc.).[30] Other scientists have produced evidence to the contrary,[31] and dismiss those studies as artifacts of in vitro culture, or interpreting background noise as signal,[32] and warn about Oct-4 pseudogenes giving false detection of Oct-4 expression.[33] Oct-4 has also been implicated as a marker of cancer stem cells.[34][35]

See also

References

  1. ^ a b c ENSG00000206454, ENSG00000204531, ENSG00000237582, ENSG00000229094, ENSG00000233911, ENSG00000235068 GRCh38: Ensembl release 89: ENSG00000230336, ENSG00000206454, ENSG00000204531, ENSG00000237582, ENSG00000229094, ENSG00000233911, ENSG00000235068 – Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000024406 – Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^ Takeda J, Seino S, Bell GI (September 1992). "Human Oct3 gene family: cDNA sequences, alternative splicing, gene organization, chromosomal location, and expression at low levels in adult tissues". Nucleic Acids Research. 20 (17): 4613–20. doi:10.1093/nar/20.17.4613. PMC 334192. PMID 1408763.
  6. ^ Young Lab- Core Transcriptional Regulatory Circuitry in Human Embryonic Stem Cells Archived 2009-06-28 at the Wayback Machine at MIT
  7. ^ a b Niwa H, Miyazaki J, Smith AG (April 2000). "Quantitative expression of Oct-3/4 defines differentiation, dedifferentiation or self-renewal of ES cells". Nature Genetics. 24 (4): 372–6. doi:10.1038/74199. PMID 10742100.
  8. ^ Zeineddine, Dana et al. “The Oct4 protein: more than a magic stemness marker.” American journal of stem cells vol. 3,2 74-82. 5 Sep. 2014
  9. ^ Pan, Guang Jin, et al. “Stem Cell Pluripotency and Transcription Factor Oct4.” Cell Research, vol. 12, no. 5-6, Dec. 2002, pp. 321–329., doi:10.1038/sj.cr.7290134.
  10. ^ Wu, Guangming, and Hans R Schöler. “Role of Oct4 in the Early Embryo Development.” Cell Regeneration, vol. 3, no. 1, 2014, doi:10.1186/2045-9769-3-7.
  11. ^ Saha, Subbroto Kumar et al. “Systematic expression alteration analysis of master reprogramming factor OCT4 and its three pseudogenes in human cancer and their prognostic outcomes.” Scientific reports vol. 8,1 14806. 4 Oct. 2018, doi:10.1038/s41598-018-33094-7
  12. ^ Hochedlinger, Konrad et al. “Ectopic expression of Oct-4 blocks progenitor-cell differentiation and causes dysplasia in epithelial tissues.” Cell vol. 121,3 (2005): 465-77. doi:10.1016/j.cell.2005.02.018
  13. ^ 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 (May 2003). "POU5F1 (OCT3/4) identifies cells with pluripotent potential in human germ cell tumors". Cancer Research. 63 (9): 2244–50. PMID 12727846.
  14. ^ Zaehres H, Lensch MW, Daheron L, Stewart SA, Itskovitz-Eldor J, Daley GQ (March 2005). "High-efficiency RNA interference in human embryonic stem cells". Stem Cells. 23 (3): 299–305. doi:10.1634/stemcells.2004-0252. PMID 15749924.
  15. ^ a b Rodda DJ, Chew JL, Lim LH, Loh YH, Wang B, Ng HH, Robson P (July 2005). "Transcriptional regulation of nanog by OCT4 and SOX2". The Journal of Biological Chemistry. 280 (26): 24731–7. doi:10.1074/jbc.M502573200. PMID 15860457.
  16. ^ Hochedlinger K, Yamada Y, Beard C, Jaenisch R (May 2005). "Ectopic expression of Oct-4 blocks progenitor-cell differentiation and causes dysplasia in epithelial tissues". Cell. 121 (3): 465–77. doi:10.1016/j.cell.2005.02.018. PMID 15882627.
  17. ^ a b Thomson M, Liu SJ, Zou LN, Smith Z, Meissner A, Ramanathan S (June 2011). "Pluripotency factors in embryonic stem cells regulate differentiation into germ layers". Cell. 145 (6): 875–89. doi:10.1016/j.cell.2011.05.017. PMC 5603300. PMID 21663792.
  18. ^ Heurtier, V., Owens, N., Gonzalez, I. et al. The molecular logic of Nanog-induced self-renewal in mouse embryonic stem cells. Nat Commun 10, 1109 (2019). https://doi.org/10.1038/s41467-019-09041-z
  19. ^ Okita K, Ichisaka T, Yamanaka S (July 2007). "Generation of germline-competent induced pluripotent stem cells". Nature. 448 (7151): 313–7. doi:10.1038/nature05934. PMID 17554338.
  20. ^ Wernig M, Meissner A, Foreman R, Brambrink T, Ku M, Hochedlinger K, Bernstein BE, Jaenisch R (July 2007). "In vitro reprogramming of fibroblasts into a pluripotent ES-cell-like state". Nature. 448 (7151): 318–24. doi:10.1038/nature05944. PMID 17554336.
  21. ^ Maherali N, Sridharan R, Xie W, Utikal J, Eminli S, Arnold K, Stadtfeld M, Yachechko R, Tchieu J, Jaenisch R, Plath K, Hochedlinger K (June 2007). "Directly reprogrammed fibroblasts show global epigenetic remodeling and widespread tissue contribution". Cell Stem Cell. 1 (1): 55–70. doi:10.1016/j.stem.2007.05.014. PMID 18371336.
  22. ^ Yu J, Vodyanik MA, Smuga-Otto K, Antosiewicz-Bourget J, Frane JL, Tian S, Nie J, Jonsdottir GA, Ruotti V, Stewart R, Slukvin II, Thomson JA (December 2007). "Induced pluripotent stem cell lines derived from human somatic cells". Science. 318 (5858): 1917–20. doi:10.1126/science.1151526. PMID 18029452.
  23. ^ Kim JB, Zaehres H, Wu G, Gentile L, Ko K, Sebastiano V, Araúzo-Bravo MJ, Ruau D, Han DW, Zenke M, Schöler HR (July 2008). "Pluripotent stem cells induced from adult neural stem cells by reprogramming with two factors". Nature. 454 (7204): 646–50. doi:10.1038/nature07061. PMID 18594515.
  24. ^ Kim JB, Sebastiano V, Wu G, Araúzo-Bravo MJ, Sasse P, Gentile L, Ko K, Ruau D, Ehrich M, van den Boom D, Meyer J, Hübner K, Bernemann C, Ortmeier C, Zenke M, Fleischmann BK, Zaehres H, Schöler HR (February 2009). "Oct4-induced pluripotency in adult neural stem cells". Cell. 136 (3): 411–9. doi:10.1016/j.cell.2009.01.023. PMID 19203577.
  25. ^ Nakagawa M, Koyanagi M, Tanabe K, Takahashi K, Ichisaka T, Aoi T, et al. (January 2008). "Generation of induced pluripotent stem cells without Myc from mouse and human fibroblasts". Nature Biotechnology. 26 (1): 101–6. doi:10.1038/nbt1374. PMID 18059259.
  26. ^ Velychko S, Adachi K, Kim KP, Hou Y, MacCarthy CM, Wu G, Schöler HR (December 2019). "Excluding Oct4 from Yamanaka Cocktail Unleashes the Developmental Potential of iPSCs". Cell Stem Cell. 25 (6): 737–753.e4. doi:10.1016/j.stem.2019.10.002. PMID 31708402.
  27. ^ a b Ben-Shushan E, Thompson JR, Gudas LJ, Bergman Y (April 1998). "Rex-1, a gene encoding a transcription factor expressed in the early embryo, is regulated via Oct-3/4 and Oct-6 binding to an octamer site and a novel protein, Rox-1, binding to an adjacent site". Molecular and Cellular Biology. 18 (4): 1866–78. doi:10.1128/mcb.18.4.1866. PMC 121416. PMID 9528758.
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  29. ^ Fogarty NM, McCarthy A, Snijders KE, Powell BE, Kubikova N, Blakeley P, Lea R, Elder K, Wamaitha SE, Kim D, Maciulyte V, Kleinjung J, Kim JS, Wells D, Vallier L, Bertero A, Turner JM, Niakan KK (October 2017). "Genome editing reveals a role for OCT4 in human embryogenesis". Nature. 550 (7674): 67–73. doi:10.1038/nature24033. PMC 5815497. PMID 28953884.
  30. ^ For example:
  31. ^ Lengner CJ, Camargo FD, Hochedlinger K, Welstead GG, Zaidi S, Gokhale S, Scholer HR, Tomilin A, Jaenisch R (October 2007). "Oct4 expression is not required for mouse somatic stem cell self-renewal". Cell Stem Cell. 1 (4): 403–15. doi:10.1016/j.stem.2007.07.020. PMC 2151746. PMID 18159219.
  32. ^ Lengner CJ, Welstead GG, Jaenisch R (March 2008). "The pluripotency regulator Oct4: a role in somatic stem cells?". Cell Cycle. 7 (6): 725–8. doi:10.4161/cc.7.6.5573. PMID 18239456.
  33. ^ Zangrossi S, Marabese M, Broggini M, Giordano R, D'Erasmo M, Montelatici E, Intini D, Neri A, Pesce M, Rebulla P, Lazzari L (July 2007). "Oct-4 expression in adult human differentiated cells challenges its role as a pure stem cell marker". Stem Cells. 25 (7): 1675–80. doi:10.1634/stemcells.2006-0611. PMID 17379765.
  34. ^ Kim RJ, Nam JS (June 2011). "OCT4 Expression Enhances Features of Cancer Stem Cells in a Mouse Model of Breast Cancer". Laboratory Animal Research. 27 (2): 147–52. doi:10.5625/lar.2011.27.2.147. PMC 3145994. PMID 21826175.
  35. ^ Atlasi Y, Mowla SJ, Ziaee SA, Bahrami AR (April 2007). "OCT-4, an embryonic stem cell marker, is highly expressed in bladder cancer". International Journal of Cancer. 120 (7): 1598–602. doi:10.1002/ijc.22508. PMID 17205510.

Further reading

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