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Brain transcriptome analysis in the cortex and hippocampus of Cyfip2 Arg87Cys knock-in mice at four different postnatal stages

ABSTRACT: To investigate age-dependent molecular changes in the cortex and hippocampus of Cyfip2 Arg87Cys knock-in mice, we conducted transcriptome analysis at postnatal weeks 1, 7, 14, 28.

ORGANISM(S): Mus musculus

PROVIDER: GSE292221 | GEO | 2025/09/24

REPOSITORIES: GEO

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Brain transcriptome analysis in the cortex and hippocampus of Cyfip2 heterozygous mice at three different postnatal stages

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Deficiency of the neurodevelopmental disorder-associated gene Cyfip2 alters retinal ganglion cell properties and visual acuity

Project description:Intellectual disability (ID) is a neurodevelopmental disorder affecting approximately 0.5-3% of the population in the developed world. Individuals with ID exhibit deficits in intelligence and impaired adaptive behavior, frequently as well as visual impairments. Cytoplasmic FMR1-interacting protein 2 (CYFIP2) is an interacting partner of fragile X mental retardation protein, whose loss results in fragile X syndrome, the most common inherited cause of ID. Recently, CYFIP2 variants were found in patients with early-onset epileptic encephalopathy, developmental delay, and ID. Individuals with these CYFIP2 variants often exhibit visual impairments, however, the underlying mechanism is poorly understood. In the current study, we investigated the role of Cyfip2 in retinal and visual function by generating and analyzing mice in which Cyfip2 is depleted in the retina (Cyfip2 CKO mice). We found no major difference in the layer structure and cell composition between control and Cyfip2 CKO retinas, whereas a subset of genes associated with transporter and channel activity was differentially expressed in the Cyfip2 CKO retina. Multi-electrode array recordings showed more sustained and stronger response to positive flashes of ON ganglion cells in the Cyfip2 CKO retina, although we did not observe that Cyfip2 deficiency affects photoreceptor and ON bipolar cell functions by electroretinogram analysis. Furthermore, initial and late phase OKR analysis demonstrated that Cyfip2 deficiency impairs visual function at the organismal level. Together, our results shed light on the molecular mechanism underlying visual impairments observed in individuals with CYFIP2 variants and, more generally, in patients with neurodevelopmental disorders including ID.

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Project description:The cytoplasmic fragile X mental retardation 1 (FMR1)-interacting protein 2 (CYFIP2) gene is associated with epilepsy, intellectual disability (ID), and developmental delay, suggesting its critical role in proper neuronal development and function. CYFIP2 is involved in regulating cellular actin dynamics and also interacts with RNA-binding proteins. However, the adult brain function of CYFIP2 remains unclear because investigations thus far are limited to Cyfip2 heterozygous (Cyfip2+/- ) mice owing to the perinatal lethality of Cyfip2-null mice. Therefore, we generated Cyfip2 conditional knock-out (cKO) mice with reduced CYFIP2 expression in postnatal forebrain excitatory neurons (CaMKIIα-Cre). We found that in the medial prefrontal cortex (mPFC) of adult Cyfip2 cKO mice, CYFIP2 expression was decreased in both layer 2/3 (L2/3) and layer 5 (L5) neurons, unlike the L5-specific CYFIP2 reduction observed in adult Cyfip2+/- mice. Nevertheless, filamentous actin (F-actin) levels were increased only in L5 of Cyfip2 cKO mPFC possibly because of a compensatory increase in CYFIP1, the other member of CYFIP family, in L2/3 neurons. Abnormal dendritic spines on basal, but not on apical, dendrites were consistently observed in L5 neurons of Cyfip2 cKO mPFC. Meanwhile, neuronal excitability and activity were enhanced in both L2/3 and L5 neurons of Cyfip2 cKO mPFC, suggesting that CYFIP2 functions of regulating F-actin and excitability/activity may be mediated through independent mechanisms. Unexpectedly, adult Cyfip2 cKO mice did not display locomotor hyperactivity or reduced anxiety observed in Cyfip2+/- mice. Instead, both exhibited enhanced social dominance accessed by the tube test. Together, these results provide additional insights into the functions of CYFIP2 in the adult brain.

| S-EPMC7658541 | biostudies-literature

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