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- W4247164055 abstract "The roles of protein kinase C and its substrates in development are poorly understood. Recently, we disrupted the mouse gene for a major cellular substrate for protein kinase C, the MARCKS protein (Proc. Natl. Acad. Sci. USA, 92, 944–948, 1995). The resulting phenotype consisted of universal perinatal lethality, agenesis of the corpus callosum and other forebrain commissures, and neuronal ectopia and other cortical and retinal lamination disturbances. These mice also had high frequencies of exencephaly (25% overall, 35% in females). In the present study, we have examined the normal expression of MARCKS and the various isozymes of protein kinase C at the time of cranial neural tube closure, in an attempt to correlate MARCKS expression in time and anatomical location with the exencephaly characteristic of MARCKS deficiency. Failure of neural tube closure occurred at various sites in the cranial neural tube, suggesting a cellular functional defect that was not limited to a specific location. Non-exencephalic MARCKS-deficient embryos appeared to be anatomically normal on embryonic day (E) 8.5–9.5. MARCKS and PKC α were expressed at the plasma membrane of the neuroepithelial cells comprising the future neural tube, as well as in the surface ectoderm and underlying mesenchyme. Endogenous protein kinase C species, comprising either or both α and δ, were capable of phosphorylating MARCKS in intact E8.5 embryos. Thus, MARCKS is expressed at the plasma membranes of the specific cell types involved in cranial neurulation; its deficiency presumably results in a still-to-be-elucidated functional defect in these cells that leads to exencephaly in a high proportion of cases." @default.
- W4247164055 created "2022-05-12" @default.
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- W4247164055 date "1996-10-23" @default.
- W4247164055 modified "2023-09-25" @default.
- W4247164055 title "Developmental expression of MARCKS and protein kinase C in mice in relation to the exencephaly resulting from MARCKS deficiency" @default.
- W4247164055 doi "https://doi.org/10.1016/s0165-3806(96)00097-1" @default.
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