title: Redefining the progression of lineage segregations during mammalian embryogenesis by clonal analysis.
abstract: Clonal lineage information is fundamental in revealing cell fate choices. Using genetic single-cell labeling in utero, we investigated lineage segregations during anteroposterior axis formation in mouse. We show that while endoderm and surface ectoderm segregate during gastrulation, neural ectoderm and mesoderm share a common progenitor persisting through all stages of axis elongation. These data challenge the paradigm that the three germ layers, formed by gastrulation, constitute the primary branchpoints in differentiation of the pluripotent epiblast toward tissue-specific precursors. Bipotent neuromesodermal progenitors show self-renewing characteristics and may represent the cellular substrate coupling sustained axial elongation and coordinated differentiation of these tissues. These findings have important implications for the interpretation of the phenotypic defects of several mouse mutants and the directed differentiation of embryonic stem (ES) cells in vitro.
authors.affiliation: Institut Pasteur, Département de Biologie du Développement, CNRS URA 2578, 25 rue du Dr. Roux, 75724 Paris cedex 15, France. tzouanacou@gmail.com
authors.forename: Elena
authors.initials: E
authors.lastname: Tzouanacou
authors.forename: Amélie
authors.initials: A
authors.lastname: Wegener
authors.forename: Filip J
authors.initials: FJ
authors.lastname: Wymeersch
authors.forename: Valerie
authors.initials: V
authors.lastname: Wilson
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Nicolas
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D019070:Cell Lineage; D049109:Cell Proliferation; D053595:Embryonic Stem Cells / Q000166:cytology; D004707:Endoderm / Q000378:metabolism; D005260:Female; D005775:Gastrula / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental; D008297:Male; D008648:Mesoderm / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D008954:Models, Biological; D013234:Stem Cells / Q000166:cytology