Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Persistent epigenome anomalies in induced pluripotent stem cells from late-onset sporadic Alzheimer’s disease cases [RNA-seq]

ABSTRACT: Reprogramming of adult somatic cells into induced pluripotent stem cells (iPSCs) resets the aging clock and is thought to erase other epigenomic marks. Here we show that iPSCs from late-onset sporadic Alzheimer’s disease (AD) cases retain epigenomic anomalies that supersede developmental defects, genomic instability, and neurodegeneration. When compared to iPSCs from elderly controls, AD iPSCs display reduced BMI1 and KDM5A expression, a more relax heterochromatin, and an altered DNA methylome. AD neuroepithelial cells show lesser efficient neural induction and forebrain specification, together with perturbed WNT signaling. They also present a unique genomic instability phenotype characterized by replication stress and DNA damage at the nuclear envelope-associated heterochromatin. BMI1 knockdown in control neuroepithelial cells phenocopied the AD-related pathologies. Long-term AD neuronal cultures show a dedifferentiation and loss-of-cell identity phenotype resembling epigenome erosion. BMI1 overexpression in AD neurons mitigates amyloid accumulation, tau pathology, heterochromatin fragmentation and G4 DNA induction. These findings implicate persistent epigenomic anomalies or uncharacterized genetic alterations working in trans on the epigenome in AD iPSCs, which could have broader implications in our understanding of the disease origin and pathophysiological mechanisms.

ORGANISM(S): Homo sapiens

PROVIDER: GSE255982 | GEO | 2024/07/30

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Persistent epigenome anomalies in induced pluripotent stem cells from late-onset sporadic Alzheimer’s disease cases [scRNA-seq]

Project description:Reprogramming of adult somatic cells into induced pluripotent stem cells (iPSCs) resets the aging clock and is thought to erase other epigenomic marks. Here we show that iPSCs from late-onset sporadic Alzheimer’s disease (AD) cases retain epigenomic anomalies that supersede developmental defects, genomic instability, and neurodegeneration. When compared to iPSCs from elderly controls, AD iPSCs display reduced BMI1 and KDM5A expression, a more relax heterochromatin, and an altered DNA methylome. AD neuroepithelial cells show lesser efficient neural induction and forebrain specification, together with perturbed WNT signaling. They also present a unique genomic instability phenotype characterized by replication stress and DNA damage at the nuclear envelope-associated heterochromatin. BMI1 knockdown in control neuroepithelial cells phenocopied the AD-related pathologies. Long-term AD neuronal cultures show a dedifferentiation and loss-of-cell identity phenotype resembling epigenome erosion. BMI1 overexpression in AD neurons mitigates amyloid accumulation, tau pathology, heterochromatin fragmentation and G4 DNA induction. These findings implicate persistent epigenomic anomalies or uncharacterized genetic alterations working in trans on the epigenome in AD iPSCs, which could have broader implications in our understanding of the disease origin and pathophysiological mechanisms.

2024-07-30 | GSE255981 | GEO

Persistent epigenome anomalies in induced pluripotent stem cells from late-onset sporadic Alzheimer’s disease cases [BiSulfite-seq]

2024-07-30 | GSE255983 | GEO

Reprogramming of mouse somatic cells into pluripotent stem cells using a combination of small molecules

Project description:Somatic cells can be reprogrammed to generate induced pluripotent stem cells (iPSCs) by overexpression of four transcription factors, Oct4, Klf4, Sox2, and c-Myc. Bmi1 is responsible for conversion of adult mouse astrocytes and fibroblasts into neural stem cell-like cells and conversion of fibroblasts into iPSCs under enforced expression of Oct4. Here, in the first step of generating iPSCs, stable intermediate cells were generated from mouse astrocytes by Bmi1 in the absence of other transcription factors. These cells [called induced epiblast stem cell (EpiSC)-like cells (iEpiSCLCs)] are similar to EpiSCs in terms of expression of specific markers, epigenetic state, and ability to differentiate into three germ layers. Treatment with MEK/ERK and GSK3 pathway inhibitors in the presence of leukemia inhibitory factor resulted in conversion of iEpiSCLCs into iPSCs that were similar to mouse embryonic stem cells (mESCs), suggesting that Bmi1 is sufficient to reprogram astrocytes to pluripotency. Next, Bmi1 function was replaced with Shh activators (oxysterol and purmorphamine), which demonstrated that specific combinations of small molecules alone can reprogram mouse fibroblasts into iPSCs. These iPSCs resembled mESCs in terms of global gene expression profile, epigenetic status, and developmental potential, demonstrating that combinations of small molecules can compensate for reprogramming factors and are sufficient to directly reprogram mouse somatic cells into iPSCs. 4 Affymetrix and 4 Agilent samples

2013-06-29 | E-GEOD-48411 | biostudies-arrayexpress

Friedreichâ??s Ataxia Induced Pluripotent Stem Cells Recapitulate GAAâ?¢TTC Triplet-Repeat Instability

Project description:The inherited neurodegenerative disease Friedreichâ??s ataxia (FRDA) is caused by hyperexpansion of GAAâ?¢TTC trinucleotide repeats within the first intron of the FXN gene, encoding the mitochondrial protein frataxin. Long GAAâ?¢TTC repeats causes heterochromatin-mediated silencing and loss of frataxin in affected individuals. We report the derivation of induced pluripotent stem cells (iPSCs) from FRDA patient fibroblasts through retroviral transduction of transcription factors. FXN gene repression is maintained in the iPSCs, as are the mRNA and miRNA global expression signatures reflecting the human disease. GAAâ?¢TTC repeats uniquely in FXN in the iPSCs exhibit repeat instability similar to patient families, where they expand and/or contract with discrete changes in length between generations. The mismatch repair enzyme Msh2, implicated in repeat instability in other triplet repeat diseases, is highly expressed in the iPSCs, occupies FXN intron 1, and shRNA silencing of Msh2 impedes repeat expansion, providing a possible molecular explanation for repeat expansion in FRDA. 65 samples from various number of tissue, primary cell lines undifferenatiated human embryonic stem cell lines, induces pluripotent stem cell lines have been run on Illumina HT12 v3 chips.

2010-07-30 | E-GEOD-22651 | biostudies-arrayexpress

The aberrant epigenome of DNMT3B-mutated ICF1 patient iPSCs is amenable to correction, with the exception of a subset of regions with H3K4me3- and/or CTCF-based epigenetic memory (WGBS)

Project description:Bi-allelic hypomorphic mutations in DNMT3B disrupt DNA methyltransferase activity and lead to Immunodeficiency, Centromeric instability, Facial anomalies syndrome, type 1 (ICF1). While several ICF1 phenotypes have been linked to abnormally hypomethylated repetitive regions, the unique genomic regions responsible for the remaining disease phenotypes remain largely uncharacterized. Here we explored two ICF1 patient-induced pluripotent stem cells (iPSCs) and their CRISPR-Cas9 corrected clones to determine whether DNMT3B correction can globally overcome DNA methylation defects and related changes in the epigenome. Hypomethylated regions throughout the genome were found highly comparable between ICF1 iPSCs carrying different DNMT3B variants, and significantly overlap with those in ICF1-peripheral blood and lymphoblastoid cell lines. These regions include large CpG island domains, as well as promoters and enhancers of several lineage-specific genes, in particular immune-related, suggesting that they are pre-marked during early development. CRISPR-corrected ICF1 iPSCs reveal that the majority of phenotype-related hypomethylated regions re-acquire normal DNA methylation levels following editing. However, at the most severely hypomethylated regions in ICF1 iPSCs, which also display the highest increased H3K4me3 levels and/or abnormal CTCF binding, the epigenetic memory persisted, and hypomethylation was uncorrected. Overall, we demonstrate that restoring the catalytic activity of DNMT3B can reverse the majority of the ICF1 aberrant epigenome. However, a small fraction of the genome is resilient to this rescue, highlighting the challenge of reverting disease states that are due to genome-wide epigenetic perturbations. Uncovering the basis for the persistent epigenetic memory will promote the development of strategies to overcome this obstacle-

2023-01-11 | GSE197924 | GEO

The aberrant epigenome of DNMT3B-mutated ICF1 patient iPSCs is amenable to correction, with the exception of a subset of regions with H3K4me3- and/or CTCF-based epigenetic memory (RNA-seq)

2023-01-11 | GSE197923 | GEO

The aberrant epigenome of DNMT3B-mutated ICF1 patient iPSCs is amenable to correction, with the exception of a subset of regions with H3K4me3- and/or CTCF-based epigenetic memory (ChIP-seq)

2023-01-11 | GSE197922 | GEO

Reprogramming of mouse somatic cells into pluripotent stem cells using a combination of small molecules

2013-06-29 | GSE48411 | GEO

Friedreich’s Ataxia Induced Pluripotent Stem Cells Recapitulate GAA•TTC Triplet-Repeat Instability

Project description:The inherited neurodegenerative disease Friedreich’s ataxia (FRDA) is caused by hyperexpansion of GAA•TTC trinucleotide repeats within the first intron of the FXN gene, encoding the mitochondrial protein frataxin. Long GAA•TTC repeats causes heterochromatin-mediated silencing and loss of frataxin in affected individuals. We report the derivation of induced pluripotent stem cells (iPSCs) from FRDA patient fibroblasts through retroviral transduction of transcription factors. FXN gene repression is maintained in the iPSCs, as are the mRNA and miRNA global expression signatures reflecting the human disease. GAA•TTC repeats uniquely in FXN in the iPSCs exhibit repeat instability similar to patient families, where they expand and/or contract with discrete changes in length between generations. The mismatch repair enzyme Msh2, implicated in repeat instability in other triplet repeat diseases, is highly expressed in the iPSCs, occupies FXN intron 1, and shRNA silencing of Msh2 impedes repeat expansion, providing a possible molecular explanation for repeat expansion in FRDA.

2010-07-02 | GSE22651 | GEO

Selective demethylation and altered gene expression are associated with ICF Syndrome in human induced pluripotent stem cells and mesenchymal stem cells

Project description:Immunodeficiency, Centromeric Instability, and Facial Anomalies Type I (ICF1) Syndrome is a rare genetic disease caused by mutations in DNMT3B, a de novo DNA methyltransferase. However, the molecular basis of how DNMT3B-deficiency leads to ICF1 pathogenesis is unclear. Induced pluripotent stem cell (iPSC) technology facilitates the study of early human developmental diseases via facile in vitro paradigms. Here, we generate iPSCs from ICF Type 1 Syndrome patient fibroblasts followed by directed differentiation of ICF1-iPSCs to mesenchymal stem cells (MSCs). By performing genome-scale bisulfite sequencing, we find that DNMT3B-deficient iPSCs exhibit global loss of non-CG methylation and select CG hypomethylation at gene promoters and enhancers. Further unbiased scanning of ICF1 iPSC methylomes also identifies large megabase regions of CG hypomethylation typically localized in centromeric and subtelomeric regions. RNA sequencing of ICF1 and control iPSCs reveals abnormal gene expression in ICF1 iPSCs relevant to ICF Syndrome phenotypes, some directly associated with promoter or enhancer hypomethylation. Upon differentiation of ICF1 iPSCs to mesenchymal stem cells (MSCs), we find virtually all CG hypomethylated regions remained hypomethylated when compared to either wild-type iPSC-derived MSCs or primary bone-marrow MSCs. Collectively, our results show specific methylome and transcriptome defects in both ICF1-iPSCs and differentiated somatic cell lineages, providing a valuable stem cell system for further in vitro study of the molecular pathogenesis of ICF1 Syndrome. MethylC-seq and RNA-Seq in ICF Syndrome patient fibroblast derived induced pluripotent stem cells.

2014-11-17 | E-GEOD-46030 | biostudies-arrayexpress

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data