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    Journal of anatomy. 2017 Feb 9. doi: 10.1111/joa.12590
    A staging system for correct phenotype interpretation of mouse embryos harvested on embryonic day 14 (E14.5).
    Geyer SH1,  Reissig L2,  Rose J3,  Wilson R4,  Prin F5,  Szumska D6,  Ramirez-Solis R7,  Tudor C8,  White J9,  Mohun TJ10,  Weninger WJ11
    Author information
    1Centre for Anatomy and Cell Biology & MIC, Medical University of Vienna, Vienna, Austria.
    2Centre for Anatomy and Cell Biology & MIC, Medical University of Vienna, Vienna, Austria.
    3Centre for Anatomy and Cell Biology & MIC, Medical University of Vienna, Vienna, Austria.
    4The Francis Crick Institute Mill Hill Laboratory, London, UK.
    5The Francis Crick Institute Mill Hill Laboratory, London, UK.
    6Wellcome Trust Centre for Human Genetics, Oxford, UK.
    7Wellcome Trust Sanger Institute, Hinxton, Cambridge, UK.
    8Wellcome Trust Sanger Institute, Hinxton, Cambridge, UK.
    9Wellcome Trust Sanger Institute, Hinxton, Cambridge, UK.
    10The Francis Crick Institute Mill Hill Laboratory, London, UK.
    11Centre for Anatomy and Cell Biology & MIC, Medical University of Vienna, Vienna, Austria.
    Abstract

    We present a simple and quick system for accurately scoring the developmental progress of mouse embryos harvested on embryonic day 14 (E14.5). Based solely on the external appearance of the maturing forelimb, we provide a convenient way to distinguish six developmental sub-stages. Using a variety of objective morphometric data obtained from the commonly used C57BL/6N mouse strain, we show that these stages correlate precisely with the growth of the entire embryo and its organs. Applying the new staging system to phenotype analyses of E14.5 embryos of 58 embryonic lethal null mutant lines from the DMDD research programme (https://dmdd.org.uk) and its pilot, we show that homozygous mutant embryos are frequently delayed in development. To demonstrate the importance of our staging system for correct phenotype interpretation, we describe stage-specific changes of the palate, heart and gut, and provide examples in which correct diagnosis of malformations relies on correct staging.


    © 2017 Anatomical Society.

    KEYWORDS: Deciphering the Mechanisms of Developmental Disorders, embryo, high-resolution episcopic microscopy, knock out, morphology, mutant

    Publikations ID: 28185240
    Quelle: öffnen
     
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