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CELF2-dependent RNA regulation supports cortical architecture and synaptic stability during early brain development

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus

PROVIDER: GSE319433 | GEO | 2026/06/03

REPOSITORIES: GEO

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CELF2-dependent RNA regulation supports cortical architecture and synaptic stability during early brain development [RNAseq]

Project description:Neurodevelopment relies on precise post-transcriptional regulation to coordinate neuronal differentiation, migration, and circuit formation. The CUGBP Elav-like family member 2 (CELF2) is an RNA-binding protein with established roles in alternative splicing and mRNA regulation, yet its function in the developing brain remains poorly defined. Here, we investigated the role of CELF2 during early postnatal neurodevelopment using a constitutive Celf2 knockout mouse model. Celf2 knockout pups exhibited neonatal lethality accompanied by impaired neuronal maturation and disrupted cortical organization. Bulk RNA sequencing revealed widespread transcriptional dysregulation, while splicing analyses identified reduced exon inclusion in multiple neurodevelopmental transcripts following CELF2 loss. Notably, Camk2a transcript and protein levels were markedly reduced in knockout brains, consistent with CELF2 binding to the Camk2a 3′UTR. Functional studies in Caenorhabditis elegans demonstrated that expression of human CAMK2A partially rescued synaptic puncta deficits in unc-75 (CELF ortholog) mutants, supporting a conserved role for CELF-family proteins in synaptic maturation. Histological analyses revealed reductions in Nestin- and Doublecortin-positive immature neurons, thinning of upper cortical layers, and decreased CAMK2A expression. Single-nucleus RNA sequencing further revealed selective reductions in upper layer II/III excitatory neuron populations in the cortex. Together, these findings establish CELF2 as a critical post-transcriptional regulator required for neuronal maturation and architectural stability during early brain development and highlight how disruption of RNA regulatory programs may contribute to neurodevelopmental disorders.

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