Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Channelopathy pathogenesis in a human neural cell model of Angelman Syndrome

ABSTRACT: Angelman syndrome (AS) is a neurogenetic developmental disorder that results from the loss of E3 ubiquitin ligase UBE3A due to mutations in or deletions of the maternally inherited UBE3A allele. While mouse models of AS have implicated abnormal synaptic signaling and plasticity underlying behavioral dysfunction, how the loss of UBE3A contributes to hyperactivity of neuronal networks seen in AS patients remains unclear. Here, by utilizing human induced neurons and 3D cortical organoids derived from AS patient iPSCs and CRISPR-Cas9 mediated UBE3A KO hESCs, we uncovered a novel role of UBE3A in suppressing neuronal hyperexcitability via ubiquitin-mediated degradation of BK channels. More importantly, augmented BK channel activity in neurons manifested as increased intrinsic excitability of neurons and network level bursting and synchronization, which can be pharmacologically normalized by BK antagonists. Our study has illustrated the utility of modeling neurological diseases with human neural cells, and our results have provided new insights into underlying pathophysiological mechanisms and potential therapeutic strategy in Angelman syndrome.

ORGANISM(S): Homo sapiens

PROVIDER: GSE120225 | GEO | 2020/08/18

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Differences in transcription in Angelman syndrome and control person iPSC-derived neurons

Project description:Angelman syndrome is caused by loss of funtional ubiquitin E3 ligase UBE3A and results in severe deley in cognitive and motor development. In neurons, UBE3A locates to the synapse and to the nucleus. Loss of nuclear UBE3A results in development of Angelman syndrome like symptoms in mice. UBE3A can function as transcriptional coactivator of steroid hormone receptors, but the entire function of UBE3A in the nucleus is still not clear. So we wanted to study differences in the transcriptome in neurons differentiated from iPSCs that were derived from patients with Angleman syndrome and normal controls.

2020-12-31 | GSE146640 | GEO

HAP1 is an in vivo UBE3A Target that Augments Autophagy in a Mouse Model of Angelman Syndrome

Project description:Angelman syndrome (AS) is a severe neurodevelopmental disorder caused by maternal mutation and paternal imprinting of the gene encoding UBE3A, an E3 ubiquitin ligase. Although several potential target proteins of UBE3A have been reported, how these proteins regulate neuronal development remains unclear. We performed a large-scale quantitative proteomic analysis using stable-isotope labeling of amino acids in mammals (SILAM) on mice with maternal Ube3a mutation.

2018-12-15 | MSV000083239 | MassIVE

The hippocampal response to acute corticosterone elevation is altered in a mouse model for Angelman syndrome

Project description:Angelman Syndrome (AS) is a severe neurodevelopmental disorder, caused by the neuronal absence of the ubiquitin protein ligase E3A (UBE3A). UBE3A promotes ubiquitin-mediated protein degradation and functions as a transcriptional coregulator of nuclear hormone receptors, including the glucocorticoid receptor (GR). Previous studies showed anxiety-like behavior and hippocampal-dependent memory disturbances in AS mouse models. Hippocampal GR is an important regulator of the stress response and memory formation, and we therefore investigated whether the absence of UBE3A in AS mice disrupted GR signaling in the hippocampus. We first established a strong cortisol-dependent interaction between the GR ligand binding domain and a UBE3A nuclear receptor box in a high-throughput interaction screen. In vivo, we found that UBE3A-deficient AS mice displayed significantly more variation in circulating corticosterone levels throughout the day compared to wildtypes (WT), with low to undetectable levels of corticosterone at the trough of the circadian cycle. Additionally, we observed an enhanced transcriptomic response in the AS hippocampus following acute corticosterone treatment. Surprisingly, chronic corticosterone treatment showed less contrast between AS and WT mice in the hippocampus and liver transcriptomic responses. This suggests that UBE3A limits the acute stimulation of GR signaling, likely as a member of the GR transcriptional complex. Altogether, these data indicate that AS mice are more sensitive to acute glucocorticoid exposure in the brain compared to WT mice. This suggests that stress responsiveness is altered in AS which could lead to anxiety symptoms.

2022-12-23 | GSE221378 | GEO

Imprinting effects of UBE3A loss on synaptic gene networks and Wnt signaling pathways

Project description:UBE3A encodes a E3 ubiquitin ligase whose loss from the maternal allele causes the neurodevelopmental disorder Angelman syndrome. Previous studies of UBE3A function have not examined full Ube3a deletion in mouse, the complexity of imprinted gene networks in brain, nor the molecular basis of systems-level cognitive dysfunctions in Angelman syndrome. We therefore utilized a systems biology approach to elucidate how UBE3A loss impacts the early postnatal brain in a novel CRISPR/Cas9 engineered rat Angelman model of a complete Ube3a deletion. Strand-specific transcriptome analysis of offspring from maternally or paternally inherited Ube3a deletions revealed the expected parental expression patterns of Ube3a sense and antisense transcripts by postnatal day 2 (P2) in hypothalamus and day 9 (P9) in cortex, compared to wild-type littermates. The dependency of genome-wide effects on parent-of-origin, Ube3a genotype, and time (P2, P9) was investigated through transcriptome (RNA-seq of cortex and hypothalamus) and methylome (whole genome bisulfite sequencing of hypothalamus). Weighted gene co-expression and co-methylation network analyses identified co-regulated networks in maternally inherited Ube3a deletion offspring enriched in postnatal developmental processes including Wnt signaling, synaptic regulation, neuronal and glial functions, epigenetic regulation, ubiquitin, circadian entrainment, and splicing. Furthermore, we showed that loss of the paternal Ube3a antisense transcript resulted in both unique and overlapping dysregulated gene pathways with maternal loss, predominantly at the level of differential methylation. Together, these results provide a holistic examination of the molecular impacts of UBE3A loss in brain, supporting the existence of interactive epigenetic networks between maternal and paternal transcripts at the Ube3a locus.

2020-03-01 | GSE137217 | GEO

Proteomic analysis of Angelman mouse models

Project description:Angelman syndrome (AS) is a severe neurodevelopmental disorder caused by the loss of neuronal E3 ligase UBE3A. Restoring UBE3A levels is a potential disease-modifying therapy for AS and has recently entered clinical trials. There is paucity of data regarding the molecular changes downstream of UBE3A, hampering elucidation of disease therapeutics and biomarkers. Notably, UBE3A plays an important role in the nucleus but its targets have yet to be elucidated. Using proteomics, we assessed changes during postnatal cortical development in an AS mouse model. Pathway analysis revealed dysregulation of proteasomal and tRNA synthetase pathways at all postnatal brain developmental stages, while synaptic proteins were altered in adults. We confirmed pathway alterations in an adult AS rat model across multiple brain regions and highlighted region-specific differences. The top hits were altered in human AS patient neurons, supporting disease translation. UBE3A reinstatement in AS mice resulted in near complete and partial rescue of the proteome alterations in adolescence and adults respectively, supporting the notion that early restoration of UBE3A expression provides is a promising therapeutic option. We show that Transketolase (TKT), one of the most abundantly altered proteins, is a direct UBE3A substrate and is elevated in the neuronal nucleus of rat brains and human iPSC derived neurons. Taken together, our study provides a comprehensive map of UBE3A driven changes in AS across development and species, and corroborates UBE3A reinstatement as a viable therapeutic option.

2021-08-12 | MSV000087972 | MassIVE

Establishing a molecular phenotype for Angelman Syndrome stem cell-derived neurons

Project description:mRNAseq on (1) isogenic control and Angelman Syndrome pluripotent stem cell-derived neurons or (2) antisense oligonucleotide-treated H9 hESC-derived neurons

2021-04-01 | GSE160747 | GEO

Cobalamins function as allosteric activators of an Angelman syndrome-associated UBE3A/E6AP variant

Project description:Genetic aberrations of the maternal UBE3A allele, which encodes the E3 ubiquitin ligase E6AP, are the cause of Angelman syndrome (AS), an imprinting disorder. In most cases, the maternal UBE3A allele is not expressed. Yet, approximately 10 percent of AS individuals harbor distinct point mutations in the maternal allele resulting in the expression of full-length E6AP variants that frequently display compromised ligase activity. In a high-throughput screen, we identified cyanocobalamin, a vitamin B12-derivative, and several alloxazine derivatives as activators of the AS-linked E6AP-F583S variant. Furthermore, we show by cross-linking coupled to mass spectrometry that cobalamins affect the structural dynamics of E6AP-F583S and apply limited proteolysis coupled to mass spectrometry to obtain information about the regions of E6AP that are involved in, or are affected by, binding cobalamins and alloxazine derivatives. Our data suggest that dietary supplementation with vitamin B12 could be beneficial for AS individuals.

2024-05-09 | PXD048963 | Pride

Secreted retrovirus-like GAG domain containing protein PEG10 is regulated by UBE3A and is involved in Angelman syndrome pathophysiology

Project description:Angelman syndrome (AS) is a severe neurodevelopmental disorder caused by mutations that effect expression of the maternal UBE3A allele, which encodes the ubiquitin protein ligase E3A (UBE3A). Although several potential UBE3A targets have been identified, our understanding of relevant disease targets is very limited, and validation in patient-derived cells is lacking. We established human iPSC (hiPSC) control and AS patient-derived neuronal models and demonstrate specific and reciprocal modulation of UBE3A using anti-sense oligonucleotides (ASOs). Through unbiased proteomic analysis we identified proteins whose abundance were directly affected by manipulating UBE3A levels, including the novel human specific PEG10 protein, a secreted retrotransposon derived GAG domain-containing protein. PEG10 protein, but not RNA, was elevated in AS hiPSC-derived neurons as well as in postmortem AS brain tissue, and we showed that its upregulation in patient-derived cells is dependent on both UBE3A and normal proteasome function. Functional analysis revealed that PEG10 binds both RNA and ataxia associated proteins, ATXN2 and ATXN10. PEG10 localizes to stress granules and is secreted in extracellular vesicles, where it regulates vesicle content. AS patient-derived neurons in which either UBE3A was reinstated or PEG10 was reduced, showed a striking similarity in transcriptome changes. In addition, overexpression of PEG10 during mouse brain development affected the migration of the PEG10-overexpressing neurons, suggesting that PEG10 overexpression can affect neuronal function at a critical time during brain development. Taken together these findings imply that PEG10 is a novel secreted UBE3A target, and is involved in AS pathophysiology.

2021-06-18 | MSV000087654 | MassIVE

Identification of small molecule activators of the ubiquitin ligase E6AP/UBE3A and Angelman syndrome-derived E6AP/UBE3A variants

Project description:Genetic aberrations of the UBE3A gene encoding the E3 ubiquitin ligase E6AP underlie the development of Angelman syndrome (AS). Approximately 10 percent of AS individuals harbor UBE3A genes with point mutations, frequently resulting in the expression of full-length E6AP variants with defective E3 activity. Since E6AP exists in two states, an inactive and an active one, we hypothesized that distinct small molecules can stabilize the active state and that such molecules may rescue the E3 activity of AS-derived E6AP variants. Therefore, we established an assay that allows identifying modulators of E6AP in a high-throughput format. We identified several compounds that not only stimulate wild-type E6AP but also rescue the E3 activity of certain E6AP variants. Moreover, by chemical crosslinking coupled to mass spectrometry we provide evidence that the compounds stabilize an active conformation of E6AP. Thus, these compounds represent potential lead structures for the design of drugs for AS treatment.

2020-09-28 | PXD020602 | Pride

Sex-Dependent Sensory Phenotypes and Related Transcriptomic Expression Profiles Are Differentially Affected by Angelman Syndrome

Project description:Angelman syndrome (AS) is a genetic disorder which entails autism, intellectual disability, lack of speech, motor deficits, andseizure susceptibility. It is caused by the lack of UBE3A protein expression, which is an E3-ubiquitin ligase. Despite AS equalprevalence in males and females, not much data on how sex affects the syndrome was reported. In the herein study, we thoroughlycharacterized many behavioral phenotypes of AS mice. The behavioral data acquired was analyzed with respect to sex. Inaddition, we generated a new mRNA sequencing dataset. We analyzed the coding transcriptome expression profiles with respectto the effects of genotype and sex observed in the behavioral phenotypes. We identified several neurobehavioral aspects,especially sensory perception, where AS mice either lack the male-to-female differences observed in wild-type littermates oreven show opposed differences. However, motor phenotypes did not show male-to-female variation between wild-type (WT) andAS mice. In addition, by utilizing the mRNA sequencing, we identified genes and isoforms with expression profiles that mirrorthe sensory perception results. These genes are differentially regulated in the two sexes with inverse expression profiles in ASmice compared to WT littermates. Some of these are known pain-related and estrogen-dependent genes. The observed differ-ences in sex-dependent neurobehavioral phenotypes and the differential transcriptome expression profiles in AS mice strengthenthe evidence for molecular cross talk between Ube3a protein and sex hormone receptors or their elicited pathways. Theseinteractions are essential for understanding Ube3a deletion effects, beyond its E3-ligase activity.

2019-05-09 | GSE130883 | GEO

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