title: Zfp143 regulates Nanog through modulation of Oct4 binding.
abstract: Identification of regulators governing the maintenance of embryonic stem (ES) cells is crucial to the understanding of ES cell biology. We identified a zinc finger protein, Zfp143, as a novel regulator for self-renewal. Depletion of Zfp143 by RNA interference causes loss of self-renewal of ES cells. Chromatin immunoprecipitation and electrophoretic mobility shift assays show the direct binding of Zfp143 to the Nanog proximal promoter. Knockdown of Zfp143 or mutation of the Zfp143 binding motif significantly downregulates Nanog proximal promoter activity. Importantly, enforced expression of Nanog is able to rescue the Zfp143 knockdown phenotype, indicating that Nanog is one of the key downstream effectors of Zfp143. More interestingly, we further show that Zfp143 regulates Nanog expression through modulation of Oct4 binding. Coimmunoprecipitation experiments revealed that Zfp143 and Oct4 physically interact with each other. This interaction is important because Oct4 binding to the Nanog promoter is promoted by Zfp143. Our study reveals a novel regulator functionally important for the self-renewal of ES cells and provides new insights into the expanded regulatory circuitry that maintains ES cell pluripotency. Disclosure of potential conflicts of interest is found at the end of this article.
authors.affiliation: Genome Institute of Singapore, Singapore.
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.forename: Fang
authors.initials: F
authors.lastname: Fang
authors.forename: Yih-Cherng
authors.initials: YC
authors.lastname: Liou
authors.forename: Huck-Hui
authors.initials: HH
authors.lastname: Ng
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000502:physiology; D053595:Embryonic Stem Cells / Q000166:cytology* / Q000502:physiology; D005786:Gene Expression Regulation; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D051379:Mice; D000071317:Nanog Homeobox Protein; D050814:Octamer Transcription Factor-3 / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D015534:Trans-Activators / Q000502:physiology*
chemical_list: D018398:Homeodomain Proteins; D000071317:Nanog Homeobox Protein; C475540:Nanog protein, mouse; D050814:Octamer Transcription Factor-3; C494174:Pou5f1 protein, mouse; D015534:Trans-Activators; C491942:Zfp143 protein, mouse