title: Asymmetric localization of Cdx2 mRNA during the first cell-fate decision in early mouse development.
abstract: A longstanding question in mammalian development is whether the divisions that segregate pluripotent progenitor cells for the future embryo from cells that differentiate into extraembryonic structures are asymmetric in cell-fate instructions. The transcription factor Cdx2 plays a key role in the first cell-fate decision. Here, using live-embryo imaging, we show that localization of Cdx2 transcripts becomes asymmetric during development, preceding cell lineage segregation. Cdx2 transcripts preferentially localize apically at the late eight-cell stage and become inherited asymmetrically during divisions that set apart pluripotent and differentiating cells. Asymmetric localization depends on a cis element within the coding region of Cdx2 and requires cell polarization as well as intact microtubule and actin cytoskeletons. Failure to enrich Cdx2 transcripts apically results in a significant decrease in the number of pluripotent cells. We discuss how the asymmetric localization and segregation of Cdx2 transcripts could contribute to multiple mechanisms that establish different cell fates in the mouse embryo.
authors: The Gurdon Institute, University of Cambridge, Tennis Court Road, Cambridge CB2 1QN, United Kingdom.
authors: Maria
authors: M
authors: Skamagki
authors: Krzysztof B
authors: KB
authors: Wicher
authors: Agnieszka
authors: A
authors: Jedrusik
authors: Sujoy
authors: S
authors: Ganguly
authors: Magdalena
authors: M
authors: Zernicka-Goetz
mesh_terms: D000818:Animals; D000071616:CDX2 Transcription Factor; D019070:Cell Lineage; D016764:Cell Polarity; D002478:Cells, Cultured; D003599:Cytoskeleton; D004622:Embryo, Mammalian / Q000378:metabolism; D047108:Embryonic Development; D018398:Homeodomain Proteins / Q000032:analysis* / Q000235:genetics / Q000378:metabolism; D017404:In Situ Hybridization, Fluorescence; D051379:Mice; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D012333:RNA, Messenger / Q000378:metabolism; D015534:Trans-Activators / Q000032:analysis* / Q000235:genetics / Q000378:metabolism
chemical_list: D000071616:CDX2 Transcription Factor; D018398:Homeodomain Proteins; D012333:RNA, Messenger; D015534:Trans-Activators
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