mortality/aging
• homozygotes die around E10
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embryo
• at E7.5 the ectoderm at the midline which will become neuroepithelium appears more stratified and less columnar
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• the mesoderm is less dense
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• posterior body elongation is retarded at E7.5
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• at E9.5 embryos appear comma-shaped, lack recognizable structures, and consist mostly of loose mesenchyme
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• at E7.5 mutants are smaller than wild-type littermates with a relative decrease in the size of the embryonic tissue relative to the extraembryonic tissue
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• the neural folds are absent at E7.5
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• at E7.5 the neuroepithelium is present but poorly developed at the anterior and posterior end of the embryo
• at E7.5 gaps are present between ectodermal cells of the lumenal layer, no identifiable tight or adherens cell junctions are found, and neuroectodermal cell polarity is reduced
• by E8.0-E8.5 the presumptive neuroectodermal layer is thick and disorganized while the anterior and posterior margins of the layer are thin
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• at E8.5 the notochord is absent
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• at E8.5 somites are absent
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• no connection is formed between the embryonic and maternal circulations
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growth/size/body
• at E7.5 mutants are smaller than wild-type littermates with a relative decrease in the size of the embryonic tissue relative to the extraembryonic tissue
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nervous system
• at E7.5 the neuroepithelium is present but poorly developed at the anterior and posterior end of the embryo
• at E7.5 gaps are present between ectodermal cells of the lumenal layer, no identifiable tight or adherens cell junctions are found, and neuroectodermal cell polarity is reduced
• by E8.0-E8.5 the presumptive neuroectodermal layer is thick and disorganized while the anterior and posterior margins of the layer are thin
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