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A microRNA cluster downstream of Fezf2 coordinates projection identity and dendritic morphology in cortical projection neurons

ABSTRACT: A microRNA cluster downstream of Fezf2 coordinates projection identity and dendritic morphology in cortical projection neurons

PROVIDER: PRJNA1082261 | ENA |

REPOSITORIES: ENA

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A microRNA cluster downstream of Fezf2 coordinates projection identity and dendritic morphology in cortical projection neurons

Project description:Cortical projection neurons comprise classes of neurons connecting the cerebral cortex to distant targets in the nervous system. Each projection neuron class acquires a distinct molecular identity and develops characteristic patterns of axonal projection and dendritic arborization that determine their inputs, outputs, and distinct functions. How different aspects of neuron identity, including axonal and dendritic morphology, are coordinated appropriately in each specific neuron type is not known. A network of transcription factors, including the selector gene Fezf2, is central to specifying cortical projection neuron fates. However, regulation down-stream of these fate-determinant transcription factors to control different aspects of neuron identity is not understood, particularly as it relates to the development of distinct dendritic arbors that determine the inputs to each projection neuron class. Here we show that the miR-193b~365 microRNA cluster downstream of Fezf2 cooperatively represses the signaling molecule Mapk8 to regulate dendritic development in a neuron subtype-specific manner.

2025-01-08 | GSE260574 | GEO

Fezf2 overexpression in murine cortical progenitors in vivo

Project description:Corticospinal motor neurons (CSMN) are one specialized class of cortical excitatory neurons, which connect layer Vb of the cortex to the spinal cord. a master transcription factor –Forebrain expressed zinc finger 2 (Fezf2) – has been identified that is necessary for the fate specification of CSMN. Fezf2 alone can cell-autonomously instruct the acquisition of CSMN-specific features when expressed in diverse, permissive cellular contexts, in vivo. In order to understand the molecular logic underlying the acquisition of CSMN traits upon Fezf2 expression, we compared the in vivo gene expression of FACS-purified cortical progenitors that ectopically expressed Fezf2 to control progenitors. We used in utero electroporation to deliver Fezf2GFP or CtrlGFP expression vectors to neocortical progenitors at E14.5, when they primarily generate CPN of the upper layers. Overexpression of Fezf2 in these progenitors is sufficient to instruct a fate-switch resulting in the generation of CSMN and other subtypes of corticofugal projection neurons. Fezf2GFP- and CtrlGFP -electroporated progenitors were FACS-purified at 24 and 48 hours after surgery and acutely profiled by microarrays.

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RNA-seq of postnatal day 0 (P0) wild-type, Fezf2-/- cortices, and Fezf2-/-;Fezf2-EnR cortices

Project description:The goal of the study was to compare gene expression of P0 wild-type, P0 Fezf2-/- cortices, and Fezf2-/-; Fezf2-EnR cortices. Total RNAs were isolated from P0 cortices dissected from wild-type (n=3), Fezf2-/- mice (n=4), and Fezf2-/-; Fezf2-EnR cortices (n=2), following Qiagen RNAeasy kit instruction.Sequence libraries were made following Illumina RNA PolyA library preparation guide.The libaries were pair-end sequenced (150nt per end). Differentially expressed genes were identified by DESEQ.

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Expression data from WT and Fezf2 KO mTECs

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ChIP-seq analysis of Fezf2 in mTECs

Project description:To investigate the genome-wide binding pattern of Fezf2, we performed ChIP-seq analysis for Fezf2. ChIP-seq of transcription factor in mTECs is difficult because of small number of mTECs or difficulty in gaining ChIP grade antibodies. Then, we generated Fezf2-3Flag knock in mice and performed ChIP-seq analysis by using anti-Flag antibody.

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Fezf2 overexpression in murine cortical progenitors in vivo

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Expression data from rostral forebrains of wild-type and Fezf1-/- Fezf2-/- mice

Project description:Zinc-finger genes Fezf1 and Fezf2 encode transcriptional repressors. Fezf1 and Fezf2 are expressed in the early neural stem/progenitor cells and control neuronal differentiation in mouse dorsal telencephalon. We compared gene expression profiles of rostral forebrains, which contain the telencephalon and the rostral part of the diencephalon, from embryonic day (E) 9.5, E10.5, and E12.5 wild-type control and Fezf1-/- Fezf2 -/- mouse embryos. The forebrain rostral to the caudal limit of the lateral ventricles was isolated manually from E9.5, E10.5, and E12.5 wild-type and Fezf1-/- Fezf2-/- mice. Total RNAs were isolated by Separsol-RNA I and were used for microarray analyses.

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