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Gene therapy of dominant CRX-Leber congenital amaurosis using patient retinal organoids II

ABSTRACT: Gene therapy of dominant CRX-Leber congenital amaurosis using patient retinal organoids II

PROVIDER: PRJNA641428 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12076762.fastq.gz	Fastqsanger.gz
	SRR12076763.fastq.gz	Fastqsanger.gz
	SRR12076764.fastq.gz	Fastqsanger.gz
	SRR12076765.fastq.gz	Fastqsanger.gz
	SRR12076766.fastq.gz	Fastqsanger.gz

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Gene therapy of dominant CRX-Leber congenital amaurosis using patient retinal organoids II

Project description:Mutations in the cone-rod homeobox (CRX) transcription factor lead to distinct retinopathy phenotypes, including early-onset vision impairment in dominant Leber congenital amaurosis (LCA). Using induced pluripotent stem cells (iPSCs) from a patient with CRX-I138fs mutation, we established an in vitro model of CRX-LCA in retinal organoids that exhibit defective photoreceptor maturation by histology and gene profiling including diminished expression of visual opsins. Gene therapy by delivery of an additional correct CRX allele using an AAV vector partially restored photoreceptor phenotype and expression of phototransduction-related genes as revealed by single cell RNA-sequencing. Retinal organoids derived from iPSCs of a second dominant CRX-LCA patient carrying a K88N mutation revealed loss of opsin expression as a common phenotype, which could also be alleviated by AAV-mediated overexpression of CRX. Our studies provide the proof-of-concept for development of gene therapy for dominant CRX-LCA and other CRX-retinopathies.

2021-02-17 | GSE153099 | GEO

Gene therapy of dominant CRX-Leber congenital amaurosis using patient retinal organoids I

2021-02-17 | GSE152939 | GEO

Gene therapy of dominant CRX-Leber congenital amaurosis using patient retinal organoids

Project description:Gene therapy of dominant CRX-Leber congenital amaurosis using patient retinal organoids

| PRJNA641425 | ENA

Gene therapy of dominant CRX-Leber congenital amaurosis using patient retinal organoids I

Project description:Gene therapy of dominant CRX-Leber congenital amaurosis using patient retinal organoids I

| PRJNA641019 | ENA

OTX2 loss causes rod differentiation defect in CRX-associated congenital blindness

Project description:Leber congenital amaurosis (LCA) includes congenital or early-onset blinding diseases, characterized by vision loss together with nystagmus and nonrecordable electroretinogram (ERG). At least 19 genes are associated with LCA. While most LCA is recessive, mutations in the homeodomain transcription factor gene CRX lead to autosomal dominant LCA. The mechanism of CRX-LCA is not understood. Here, we report a new spontaneous mouse mutant carrying a frameshift mutation in Crx (CrxRip). We show that, unlike Crx-/- mouse retina, the dominant Crx c.763del1 mutation in CrxRip results in congenital blindness with complete loss of ERG, yet the photoreceptors do not degenerate. Dominant CRX frameshift mutations associated with LCA mimic the CrxRip phenotype that can be rescued by Crx. RNA-Seq profiling reveals progressive and complete loss of rod differentiation factor Nrl in CrxRip, while residual Nrl remains in Crx-/- retina. Moreover, Nrl partially restores the rod phenotype in CrxRip/+ mice. We show that the binding of Otx2 to Nrl promoter is obliterated in CrxRip mutant, and ectopic Otx2 can rescue the rod phenotype. Therefore, Otx2 is required to maintain Nrl expression in developing rods to consolidate rod fate. Our studies provide the mechanism of congenital blindness caused by dominant CRX mutations and should assist in therapeutic design. Retinal samples were harvested from WT, CrxRip/+, CrxRip/Rip, Crx-/- and Nrl-/- retina at postnatal days 2 and 21 for whole transcriptome sequencing (RNAseq). Each sample included 2 independent frozen retina and experiments were performed in duplicates. RNA-seq transcriptome libraries were constructed from 1 ?g of total RNA.

2014-01-13 | E-GEOD-52006 | biostudies-arrayexpress

OTX2 loss causes rod differentiation defect in CRX-associated congenital blindness

2014-01-13 | GSE52006 | GEO

Histological and single cell transcriptomic analysis of human retinal organoid models of Leber Congenital Amaurosis identifies endoplasmic reticulum stress as a common degenerative pathway

Project description:This study utilized human stem cell derived retinal organoids to characterize two models of Leber Congenital Amaurosis. Using CRISPR/Cas9, we generated CRB1 and RPGRIP1 KO cell lines and differentiated WT and KO lines into retinal organoids. Single cell capture was performed using Dropseq at days 70, 90, 120, 150, 190, and 225 of differentiation. We report upregulation of DDIT3 in both KO organoids relative to WT and confirm DDIT3 induction at the protein level by immunohistochemistry. These results indicate that these genetically different models of disease converge on endoplasmic reticulum stress and DDIT3 induction as a shared degenerative pathway. Therapeutic targeting of ER stress could help alleviate the degenerative phenotype in cases where diseased photorececeptors suffer ER stress.

2021-05-01 | GSE152212 | GEO

Gene therapy of dominant CRX-Leber congenital amaurosis using patient retinal organoids

Project description:This SuperSeries is composed of the SubSeries listed below.

2021-02-17 | GSE153101 | GEO

Two novel CRX mutant proteins causing autosomal dominant Leber congenital amaurosis interact differently with NRL.

Project description:Leber congenital amaurosis (LCA) is a congenital retinal dystrophy characterized by severe visual loss in infancy and nystagmus. Although most often inherited in an autosomal recessive fashion, rare individuals with mutations in the cone-rod homeobox gene, CRX, have dominant disease. CRX is critical for photoreceptor development and acts synergistically with the leucine-zipper transcription factor, NRL. We report on the phenotype of two individuals with LCA due to novel, de novo CRX mutations, c.G264T(p.K74N) and c.413delT(p.I138fs48), that reduce transactivation in vitro to 10% and 30% of control values, respectively. Whereas the c.413delT(p.I138fs48) mutant allows co-expressed NRL to transactivate independently at its normal, baseline level, the c.G264T(p.K74N) mutant reduces co-expressed NRL transactivation and reduces steady state levels of both proteins. Although both mutant proteins predominantly localize normally to the nucleus, they also both show variable cytoplasmic localization. These observations suggest that some CRX-mediated LCA may result from effects beyond haploinsufficiency, such as the mutant protein interefering with other transcription factors' function. Such patients would therefore not likely benefit from a simple, gene-replacement strategy for their disease.

| S-EPMC2952391 | biostudies-literature

Gene Therapy of Dominant CRX-Leber Congenital Amaurosis using Patient Stem Cell-Derived Retinal Organoids.

Project description:Mutations in the photoreceptor transcription factor gene cone-rod homeobox (CRX) lead to distinct retinopathy phenotypes, including early-onset vision impairment in dominant Leber congenital amaurosis (LCA). Using induced pluripotent stem cells (iPSCs) from a patient with CRX-I138fs48 mutation, we established an in vitro model of CRX-LCA in retinal organoids that showed defective photoreceptor maturation by histology and gene profiling, with diminished expression of visual opsins. Adeno-associated virus (AAV)-mediated CRX gene augmentation therapy partially restored photoreceptor phenotype and expression of phototransduction-related genes as determined by single-cell RNA-sequencing. Retinal organoids derived from iPSCs of a second dominant CRX-LCA patient carrying K88N mutation revealed the loss of opsin expression as a common phenotype, which was alleviated by AAV-mediated augmentation of CRX. Our studies provide a proof-of-concept for developing gene therapy of dominant CRX-LCA and other CRX retinopathies.

| S-EPMC7878833 | biostudies-literature

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