Cited by 107Developmental Biology and Gene RegulationCellular Mechanics and InteractionsCongenital heart defects research

Axis specification and morphogenesis in the mouse embryo require Nap1, a regulator of WAVE-mediated actin branching

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Rakeman, Andrew S., Anderson, Kathryn V.·2006·Development

Abstract

Dynamic cell movements and rearrangements are essential for the generation of the mammalian body plan, although relatively little is known about the genes that coordinate cell movement and cell fate. WAVE complexes are regulators of the actin cytoskeleton that couple extracellular signals to polarized cell movement. Here, we show that mouse embryos that lack Nap1, a regulatory component of the WAVE complex, arrest at midgestation and have defects in morphogenesis of all three embryonic germ layers. WAVE protein is not detectable in Nap1 mutants, and other components of the WAVE complex fail to localize to the surface of Nap1 mutant cells; thus loss of Nap1 appears to inactivate the WAVE complex in vivo. Nap1 mutants show specific morphogenetic defects: they fail to close the neural tube, fail to form a single heart tube (cardia bifida), and show delayed migration of endoderm and mesoderm. Other morphogenetic processes appear to proceed normally in the absence of Nap1/WAVE activity: the notochord, the layers of the heart, and the epithelial-to-mesenchymal transition (EMT) at gastrulation appear normal. A striking phenotype seen in approximately one quarter of Nap1 mutants is the duplication of the anteroposterior body axis. The axis duplications arise because Nap1 is required for the normal polarization and migration of cells of the Anterior Visceral Endoderm (AVE), an early extraembryonic organizer tissue. Thus, the Nap1 mutant phenotypes define the crucial roles of Nap1/WAVE-mediated actin regulation in tissue organization and establishment of the body plan of the mammalian embryo.

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  • Mice lacking other critical actin-regulatory genes such as Rac1 and the WAVE complex component Nap1 show similar developmental abnormalities, resulting in death during early embryogenesis; deletion of Rac1 and Nap1 causes death during gastrulation at E7.5 and E9, respectively.

    “Similar developmental abnormalities, resulting in death during early embryogenesis, have been observed in mice lacking other critical actin-regulatory genes such as Rac1 and the WAVE complex component Nap1. Deletion of these genes in the mouse cause death during gastrulation at E7.5 and E9, respectively.69, 70, 71”

    From The autism and schizophrenia associated gene CYFIP1 is critical for the maintenance of dendritic complexity and the stabilization of mature spines (2014) · cites this paper as [71]

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Authors
Rakeman, A. S., & Anderson, K. V.
Affiliations
  • Cornell University (US)
  • Developmental Biology Program, Sloan-Kettering Institute, 1275 York Avenue,New York, NY 10021, USA.
Corresponding author
Anderson, Kathryn V.
Venue
Development
Published
2006-08-15
Volume
133
Issue
16
Pages
3075-3083
ISSN
  • 0950-1991 (ISSN-L)
  • 1477-9129
OpenAlex
W2070660616
Cited by
107
References
50
Citations by year
2026: 6 · 2025: 6 · 2024: 6 · 2023: 2 · 2022: 2 · 2021: 6 · 2020: 6 · 2019: 5 · 2018: 2 · 2017: 6 · 2016: 3 · 2015: 4 · 2014: 9 · 2013: 2 · 2012: 7
FWCI
2.85
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Development (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (HD35455)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular Mechanics and Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Congenital heart defects research
Keywords
NAP1, WAVE complex, actin cytoskeleton, embryonic morphogenesis, neural tube closure, mesoderm migration, anterior visceral endoderm, cell polarity, mouse embryo, body plan
MeSH terms
Actins, Amino Acid Sequence, Animals, Cell Membrane, Cell Movement, Chromosome Mapping, Embryo, Mammalian, Endoderm, Genes, Lethal, Membrane Proteins, Mesoderm, Molecular Sequence Data, Morphogenesis, Pseudopodia, Embryonic Development, Wiskott-Aldrich Syndrome Protein Family, Mice

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