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• W3030235087 abstract "Abstract Neurite formation is the earliest stage of neuronal morphogenesis, where primitive dendrites and the primitive axon emerge from a spherical neuron and begin to elongate. Defective neuritogenesis is a contributing pathogenic mechanism behind a variety of neurodevelopmental disorders. Activity-dependent neuroprotective protein (Adnp) is essential to embryonic and postnatal brain development, and mutations in ADNP are among the most frequent underlying autism spectrum disorder (ASD). We found that knockdown of Adnp in vitro and in vivo in mouse layer 2/3 pyramidal neurons leads to increased neurite initiation and defective neurite elongation, suggesting that Adnp has distinct roles in each. In vivo analysis revealed that deficits begin at P0 and are sustained throughout development, the most notable of which include increased neurite stabilization, disrupted angle of the apical dendrite, increased basal dendrite number, and increased axon length. Because small changes in neuronal morphology can have large-scale effects on neuronal function and connectivity, we performed ex vivo calcium imaging to assess spontaneous function of layer 2/3 pyramidal neurons deficient in Adnp. This revealed that Adnp deficient neurons had a greater spontaneous calcium influx and a higher proportion of cells firing action potentials. Next, we utilized GRAPHIC, a novel synaptic tracing technology, to assess interhemispheric cortical connectivity. We found increased interhemispheric excitatory connectivity between Adnp deficient layer 2/3 pyramidal neurons. Because Adnp is a multifunctional protein with both transcription factor and cytoskeletal activity, we performed localization analysis of Adnp as neurons underwent neurite formation to probe the mechanism of our morphological defects. We found that Adnp is shuttled from the nucleus to the cytoplasm upon differentiation and this shuttling can be blocked via application of a global 14-3-3 inhibitor, difopein. Furthermore, we found that Adnp binds nuclear-cytoplasmic shuttle 14-3-3ε. We conclude that Adnp is shuttled from the nucleus to the cytoplasm by 14-3-3ε, where it regulates neuronal morphology, maturation, cortical connectivity, and calcium signaling." @default.
• W3030235087 created "2020-06-05" @default.
• W3030235087 creator A5041458743 @default.
• W3030235087 creator A5068536848 @default.
• W3030235087 creator A5086922294 @default.
• W3030235087 creator A5088320273 @default.
• W3030235087 date "2020-05-27" @default.
• W3030235087 modified "2023-09-24" @default.
• W3030235087 title "14-3-3 shuttles Activity-dependent neuroprotective protein to the cytoplasm to promote appropriate neuronal morphogenesis, cortical connectivity and calcium signaling" @default.
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• W3030235087 doi "https://doi.org/10.1101/2020.05.26.105015" @default.
• W3030235087 hasPublicationYear "2020" @default.
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