title: NANOG reporter cell lines generated by gene targeting in human embryonic stem cells.
abstract: BACKGROUND
  Pluripotency and self-renewal of human embryonic stem cells (hESCs) is mediated by a complex interplay between extra- and intracellular signaling pathways, which regulate the expression of pluripotency-specific transcription factors. The homeodomain transcription factor NANOG plays a central role in maintaining hESC pluripotency, but the precise role and regulation of NANOG are not well defined.
  
  
  RESULTS
  To facilitate the study of NANOG expression and regulation in viable hESC cultures, we generated fluorescent NANOG reporter cell lines by gene targeting in hESCs. In these reporter lines, the fluorescent reporter gene was co-expressed with endogenous NANOG and responded to experimental induction or repression of the NANOG promoter with appropriate changes in expression levels. Furthermore, NANOG reporter lines facilitated the separation of hESC populations based on NANOG expression levels and their subsequent characterization. Gene expression arrays on isolated hESC subpopulations revealed genes with differential expression in NANOG(high) and NANOG(low) hESCs, providing candidates for NANOG downstream targets hESCs.
  
  
  CONCLUSIONS
  The newly derived NANOG reporter hESC lines present novel tools to visualize NANOG expression in viable hESCs. In future applications, these reporter lines can be used to elucidate the function and regulation of NANOG in pluripotent hESCs.
authors.affiliation: Stem Cell Center, University of Lund, Lund, Sweden.
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Fischer
authors.forename: Elvira
authors.initials: E
authors.lastname: Ganic
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Ameri
authors.forename: Xiaojie
authors.initials: X
authors.lastname: Xian
authors.forename: Martina
authors.initials: M
authors.lastname: Johannesson
authors.forename: Henrik
authors.initials: H
authors.lastname: Semb
mesh_terms: D002460:Cell Line / Q000378:metabolism*; D053595:Embryonic Stem Cells / Q000378:metabolism*; D005786:Gene Expression Regulation; D018390:Gene Targeting; D017930:Genes, Reporter; D018398:Homeodomain Proteins / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D000071317:Nanog Homeobox Protein
chemical_list: D018398:Homeodomain Proteins; C486780:NANOG protein, human; D000071317:Nanog Homeobox Protein
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