Deficiency of the neurodevelopmental disorder-associated gene Cyfip2 alters retinal ganglion cell properties and visual acuity
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ABSTRACT:
PROVIDER: PRJNA736614 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR14777508.fastq.gz | Fastqsanger.gz | |||
| SRR14777509.fastq.gz | Fastqsanger.gz | |||
| SRR14777510.fastq.gz | Fastqsanger.gz | |||
| SRR14777511.fastq.gz | Fastqsanger.gz | |||
| SRR14777512.fastq.gz | Fastqsanger.gz |
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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.
2021-09-12 | GSE176528 | GEO
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, impaired adaptive behavior and often visual impairments. Cytoplasmic fragile X mental retardation 1 (FMR1)-interacting protein 2 (CYFIP2) is an interacting partner of the FMR protein, whose loss results in fragile X syndrome, the most common inherited cause of ID. Recently, CYFIP2 variants have been found in patients with early-onset epileptic encephalopathy, developmental delay and ID. Such individuals often exhibit visual impairments; however, the underlying mechanism is poorly understood. In the present study, we investigated the role of Cyfip2 in retinal and visual functions by generating and analyzing Cyfip2 conditional knockout (CKO) mice. While we found no major differences in the layer structures and cell compositions between the control and Cyfip2 CKO retinas, a subset of genes associated with the transporter and channel activities was differentially expressed in Cyfip2 CKO retinas than in the controls. Multi-electrode array recordings showed more sustained and stronger responses to positive flashes of the ON ganglion cells in the Cyfip2 CKO retina than in the controls, although electroretinogram analysis revealed that Cyfip2 deficiency unaffected the photoreceptor and ON bipolar cell functions. Furthermore, analysis of initial and late phase optokinetic responses demonstrated that Cyfip2 deficiency impaired the visual function at the organismal level. Together, our results shed light on the molecular mechanism underlying the visual impairments observed in individuals with CYFIP2 variants and, more generally, in patients with neurodevelopmental disorders, including ID.
| S-EPMC8863419 | biostudies-literature
Project description:CYFIP2 is a component of the WAVE regulatory complex which regulates actin polymerization and branching in diverse cellular compartments. Recent molecular genetic studies identified mutations of CYFIP2 in patients with early-onset epileptic encephalopathy and microcephaly, suggesting that CYFIP2 may have some roles in embryonic brain development. To understand its functions in vivo at the molecular level, we performed RNA-seq analysis in embryonic Cyfip2 mutant mice.
2021-09-06 | GSE119570 | GEO
Project description:CYFIP2 is a component of the WAVE regulatory complex which regulates actin polymerization and branching in diverse cellular compartments. Recent molecular genetic studies identified mutations of CYFIP2 in patients with intellectual disability and seizures, suggesting that CYFIP2 may have some roles in brain development and function. To understand its functions in vivo at the molecular level, we performed RNA-seq analysis in adult Cyfip2 mutant mice.
2021-03-28 | GSE129052 | GEO
Project description:CYFIP2 is a component of the WAVE regulatory complex which regulates actin polymerization and branching in diverse cellular compartments. Recent molecular genetic studies identified mutations of CYFIP2 in patients with intellectual disability and seizures, suggesting that CYFIP2 may have some roles in brain development and function. To understand its functions in vivo at the molecular level, we performed RNA-seq analysis in juvenile Cyfip2 mutant mice.
2021-03-28 | GSE129120 | GEO
Project description:Actin remodeling is frequently regulated by antagonistic activities driving protrusion and contraction downstream of Rac and Rho small GTPases, respectively. WAVE regulatory complex (WRC), which primarily operates downstream of Rac, plays pivotal roles in neuronal morphogenesis. Recently, two independent studies described de novo mutations in the CYFIP2 subunit of WRC, which caused intellectual disability (ID) in humans. Although mutations had been proposed to effect WRC activation, no experimental evidence for this was provided. Here, we made use of CRISPR/Cas9-engineered B16-F1 cell lines that were reconstituted with ID-causing CYFIP variants in different experimental contexts. Almost all CYFIP2-derived mutations (7 out of 8) promoted WRC activation, but to variable extent and with at least two independent mechanisms. The majority of mutations occurs in a conserved WAVE-binding region, required for WRC transinhibition. One mutation is positioned closely adjacent to the Rac-binding A site and appears to ease Rac-mediated WRC activation. As opposed to these gain-of-function mutations, a truncating mutant represented a loss-of-function variant and failed to interact with WRC components. Collectively, our data show that explored CYFIP2 mutations frequently, but not always, coincide with WRC activation and suggest that normal brain development requires a delicate and precisely tuned balance of neuronal WRC activity.
| S-EPMC7348743 | biostudies-literature
Project description:Retinal ganglion cells (RGCs) are the projection neurons in the retina that connect the visual sensing tissue to the brain. We found that Ascl1/Brn3b/Isl1 transcription factor combination can quickly and efficiently reprogramming mouse embryonic fibroblasts (MEFs) into retinal ganglion cell-like neurons (iRGCs). Using RNA-seq, we analyzed the transcriptomes of MEFs infected with Ascl1/Brn3b/Isl1-overexpressing viruses on day 2 or day 7 of reprogramming, or the final iRGCs on day 13 of reprogramming.
2020-09-30 | GSE140689 | GEO
Project description:Genome wide DNA methylation profiling of control and neurodevelopmental disorder lymphoblastoid cell lines (LCL). The Illumina Infinium 27k Human DNA methylation Beadchip v1.2 was used to obtain DNA methylation profiles across approximately 27,000 CpGs in LCLs. Samples included 19 control, 18 Rett syndrome, 17 autism and 6 generalized epilepsy LCL samples. Six technical replicates were also included in the analysis. Bisulphite converted DNA from the 60 samples and 5 technical replicates were hybridised to the Illumina Infinium 27k Human Methylation Beadchip v1.2
2012-12-01 | E-GEOD-34099 | biostudies-arrayexpress
Project description:Cortical transcriptome analysis of Cyfip2 mutant mice
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Project description:Different sub-types of ganglion cells existing in mammalian retinas possessing distinct function in processing the visual information. In primates, RGC are commonly divided into midget cells, which are relatively small, and parasol cells, with a larger soma size. Rodents also possess morphologically distinct populations, but their physiological properties are less characterized. The two types of mammalian RGCs differ in their response to pathological conditions such as retinal ischemia, diabetic retinopathy and glaucoma. In this work, we compared gene expression profiles of large (LRGCs) and small (SRGCs) ganglion cells isolated from rat retina in attempt to identify molecular determinants underlying differences in function and tolerance to stress. Keywords: comparative hybridization
2008-05-17 | GSE11468 | GEO