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Multimodal sequencing (gene expression, chromatin accessibility, and mtDNA genotyping) of single cells of the RPE and choroid in human MELAS (m.3243A>G) and control samples

ABSTRACT: Multimodal sequencing (gene expression, chromatin accessibility, and mtDNA genotyping) of single cells of the RPE and choroid in human MELAS (m.3243A>G) and control samples

PROVIDER: PRJNA837596 | ENA |

REPOSITORIES: ENA

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Multimodal sequencing (gene expression, chromatin accessibility, and mtDNA genotyping) of single cells of the RPE and choroid in human MELAS (m.3243A>G) and control samples

Project description:The mitochondrial m.3243A>G variant is known to cause retinal dystrophy and vision loss. We used single cell multimodal sequencing to understand how the presence of this mutation affects cellular phenotype in a cell type-specific manner.

2023-06-08 | GSE202886 | GEO

Chromatin accessibility and mitochondrial genotype from single cells of the retina and choroid in human MELAS (m.3243A>G) and control samples [scATAC-seq]

Project description:The mitochondrial m.3243A>G variant is known to cause retinal dystrophy and vision loss. We used mitochondria single cell ATAC sequencing to measure nuclear chromatin accessibility and mitochondrial heteroplasmy in single cells of the retina and choroid.

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Differential expression of miRNAs in a cellular model of MELAS.

Project description:We investigate the participation of miRNAs in the cell response to the mitochondrial dysfunction associated with m.3243A>G mutation in mitochondrial DNA (mtDNA), which is the most common cause of MELAS (mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes) syndrome.Through small-RNA sequencing and in silico analysis, we identified 246 differentially-expressed in a transmitochondrial cybrid model of MELAS (100% m.3243A>G mutant mitochondrial DNA), with 126 being up-regulated and 120 down-regulated. The enrichment analysis of Gene Ontology (GO) terms revealed that target genes for dysregulated miRNAs were involved in muscle and nervous system development, heart development, and signaling pathways controlling cardiac events.These data suggest that the miRNA program triggered by the MELAS m.3243A>G mutation could explain for some of the clinical manifestations of the MELAS syndrome.

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Glutamate pathway dysfunction in MELAS syndrome is alleviated by ketogenic diet

Project description:The development of mitochondrial medicine is greatly impaired by the lack of knowledge and identification of efficient therapeutic routes targeting mitochondria. To better understand the pathophysiology of MELAS syndrome, neuronal cybrid cells, carrying different mutant loads of the m.3243A>G mutation, were investigated by a metabolomics and transcriptomics combined approach. Specific signatures, identifying MELAS biochemical biomarkers, disclosed the glutamate pathway as a culprit mechanism, establishing a strong correlation between glutamate concentrations and the m.3243A>G heteroplasmy levels. Transcriptomic analyses further revealed peculiar gene clusters, including glutamate, gamma-aminobutyric acid (GABA) and tricarboxylic acid (TCA) cycle pathways. These results were supported by post-mortem brain tissue analysis of a MELAS patient, confirming the dysregulation of the glutamate metabolic pathway. Ketogenic diet known to reduce glutamate toxicity, induced a significant reduction of glutamate level after 48h of ketone body treatment, improved mitochondrial functions alleviating the accumulation of several intermediate metabolites of the TCA cycle in MELAS cells. Thus, the integrated approach using a multi-OMICs strategy on MELAS cybrid cells, disclosed novel insights in the mitochondrial energy failure, identifying glutamate as a potential biomarker of the disease, while highlighting ketogenic diet, a nutrition based strategy, to treat MELAS patients

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Gene expression from single cells of the retina and choroid in human MELAS (m.3243A>G) and control samples [scRNA-seq]

Project description:The mitochondrial m.3243A>G variant is known to cause retinal dystrophy and vision loss. We used single cell RNA sequencing to understand how the presence of this mutation affects cellular phenotype in a cell type-specific manner.

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Sonlicromanol improves neuronal network dysfunction and transcriptome changes linked to m.3243A>G heteroplasmy in iPSC-derived neurons

Project description:Mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes (MELAS) is often caused by an adenine to guanine variant at m.3243 (m.3243A>G) of the MT-TL1 gene. To understand how this pathogenic variant affects the nervous system, we differentiated human induced pluripotent stem cells (iPSCs) into excitatory neurons with normal (low heteroplasmy) and impaired (high heteroplasmy) mitochondrial function from MELAS patients with the m.3243A>G pathogenic variant. We combined micro-electrode array (MEA) measurements with RNA sequencing (MEA-seq) and found reduced expression of genes involved in mitochondrial respiration and presynaptic function, as well as non-cell autonomous processes in co-cultured astrocytes. Finally, we show that the clinical phase II drug sonlicromanol can improve neuronal network activity when treatment is initiated early in development. This was intricately linked with changes in the neuronal transcriptome. Overall, we provide insight in transcriptomic changes in iPSC-derived neurons with high m.3243A>G heteroplasmy, and show the pathology is partially reversible by sonlicromanol.

2021-07-29 | GSE154825 | GEO

Gene expression from single cells of the retina and choroid in human MELAS (m.3243A>G) and control samples [scRNA-seq]

Project description:Gene expression from single cells of the retina and choroid in human MELAS (m.3243A>G) and control samples [scRNA-seq]

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Quantitative variation in m.3243A>G mutation produce discrete changes in energy metabolism

Project description:Mitochondrial DNA (mtDNA) 3243A>G tRNALeu(UUR) heteroplasmic mutation (m.3243A>G) exhibits clinically heterogeneous phenotypes. While the high mtDNA heteroplasmy exceeding a critical threshold causes mitochondrial encephalomyopathy, lactic acidosis with stroke-like episodes (MELAS) syndrome, the low mtDNA heteroplasmy causes maternally inherited diabetes with or without deafness (MIDD) syndrome. How quantitative differences in mtDNA heteroplasmy produces distinct pathological states has remained elusive. Here we show that despite striking similarities in the energy metabolic gene expression signature, the mitochondrial bioenergetics, biogenesis and fuel catabolic functions are distinct in cells harboring low or high levels of the m.3243A>G mutation compared to wild type cells. We further demonstrate that the low heteroplasmic mutant cells exhibit a coordinate induction of transcriptional regulators of the mitochondrial biogenesis, glucose and fatty acid metabolism pathways that lack in near homoplasmic mutant cells compared to wild type cells. Altogether, these results shed new biological insights on the potential mechanisms by which low mtDNA heteroplasmy may progressively cause diabetes mellitus.

2019-04-09 | GSE129091 | GEO

mouse RPE/choroid age comparison - ATLAS arrays

Project description:Young mice were compared to old mice (2 month vs 24 month) to determine gene changes that occur with aging in the mouse retinal pigmented epithelium/choroid of the eye. Keywords = retinal pigmented epithelium Keywords = aging Keywords = choroid

2010-06-05 | E-GEOD-565 | biostudies-arrayexpress

Chromatin accessibility and mitochondrial genotype from single cells of the retina and choroid in human MELAS (m.3243A>G) and control samples [scATAC-seq]

Project description:Chromatin accessibility and mitochondrial genotype from single cells of the retina and choroid in human MELAS (m.3243A>G) and control samples [scATAC-seq]

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