Fezl Regulates the Differentiation and Axon Targeting of Layer 5 Subcortical Projection Neurons in Cerebral Cortex

• Published in: Proceedings of the National Academy of Sciences - PNAS 2005-11, Vol.102 (47), p.17184-17189
• Main Authors: Chen, Bin, Laura R. Schaevitz, McConnell, Susan K.
• Format: Article
• Language: English
• Subjects: Animals; Axons; Axons - pathology; Axons - physiology; Biological Sciences; Brain; Cell Differentiation - genetics; Cell Differentiation - physiology; Cerebral cortex; Cerebral Cortex - cytology; Cerebral Cortex - pathology; Cerebral Cortex - physiology; Developmental biology; DNA-Binding Proteins - deficiency; DNA-Binding Proteins - genetics; DNA-Binding Proteins - physiology; Forebrain; Genes, Reporter; Genetic Markers; Heterozygote; Humans; Identity; Mice; Mice, Knockout; Motor Neurons - cytology; Motor Neurons - metabolism; Motor Neurons - pathology; Nerve Tissue Proteins - deficiency; Nerve Tissue Proteins - genetics; Nerve Tissue Proteins - physiology; Neural Pathways - cytology; Neural Pathways - pathology; Neural Pathways - physiology; Neurons; Pyramidal tracts; Repressor Proteins - genetics; Repressor Proteins - physiology; Spinal cord; Staining and Labeling; Zinc Fingers - genetics; Zinc Fingers - physiology
• ISSN: 0027-8424; 1091-6490
• DOI: 10.1073/pnas.0508732102

During the development of the cerebral cortex, progenitor cells produce neurons that migrate to laminar positions appropriate for their birth dates, adopt specific neuronal identities, and form appropriate local and long-distance axonal connections. Here, we report that forebrain embryonic zinc-finger-like protein (Fezl), a putative zinc-finger transcriptional repressor, is required for the differentiation of projection neurons in cortical layer 5. In Fezl-deficient mice, these neurons display molecular, morphological, and axonal targeting defects. The corticospinal tract was absent in$Fezl^{-/-}$mice, corticotectal and pontine projections were severely reduced, and Fezl-expressing neurons formed aberrant axonal projections. The expression of many molecular markers for deep-layer neurons was reduced or absent in the$Fezl^{-/-}$cerebral cortex. Most strikingly, Ctip2, a transcription factor required for the formation of the corticospinal tract, was not expressed in the Fezl-deficient cortex. These results suggest that Fezl regulates the differentiation of layer 5 subcortical projection neurons.