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Mitochondrial Dysfunction and Increased Reactive Oxygen Species Production in MECP2 Mutant Astrocytes and their Impact on Neurons

GSE226975 Homo sapiens (human) ChIP-seq / ATAC-seq (genome binding and open chromatin) 12 samples Submitted 2024/09/12 Platform GPL24676
At a glance

ChIP-seq / ATAC-seq (genome binding and open chromatin) · human · 12 samples

What it is
ChIP-seq / ATAC-seq (genome binding and open chromatin)Where proteins bind the genome, or which regions are open and active.
Organism
Homo sapiens (human)
Samples
12 samples: 2 × Control cerebral organoid ATAC vs 2 × MECP2 mutant cerebral organoid ATAC vs 2 × Control cerebral organoid GEX vs 2 × MECP2 mutant cerebral organoid GEXGroups are read from the sample names, not from the paper. Check the list below.
Data you can get
A processed table (series matrix) and supplementary files from NCBI; the raw sequencing reads from ENA. Which of these hold counts depends on the study, so check the file list.
Paper
Mitochondrial dysfunction and increased reactive oxygen species production in MECP2 mutant astrocytes and their impact on neuronsScientific reports · 2024
Summary (written by the submitters)
Studies on MECP2 function and its implications in Rett Syndrome (RTT) have traditionally centered on neurons. Here, using human embryonic stem cell (hESC) lines, we modeled MECP2 loss-of-function (LOF) to explore its effects on astrocyte (AST) development and dysfunction in the brain. Ultrastructural analysis of RTT hESC-derived cerebral organoids revealed significantly smaller mitochondria compared to controls (CTR), particularly pronounced in glia versus neurons.
Read the full summary ↓
Employing a multiomics approach, we observed increased gene expression and accessibility of a subset of nuclear-encoded mitochondrial genes upon mutation of MECP2 in ASTs compared to neurons. Analysis of hESC-derived ASTs showed reduced mitochondrial respiration and altered key protein in the tricarboxylic acid cycle and electron transport chain in RTT versus controls. Additionally, RTT ASTs exhibited increased cytosolic amino acids under basal conditions, depleted upon increased energy demand. Notably, mitochondria isolated from RTT ASTs exhibited increased reactive oxygen species and influenced neuronal activity when transferred to cortical neurons. These findings underscore MECP2 mutation's differential impact on mitochondrial and metabolic pathways in ASTs versus neurons, suggesting that dysfunctional AST mitochondria may contribute to RTT pathophysiology by affecting neuronal health.
Published in
Mitochondrial dysfunction and increased reactive oxygen species production in MECP2 mutant astrocytes and their impact on neurons
Tomasello DL, Barrasa MI, Mankus D et al. · Scientific reports 2024 · PMID 39232000 · doi:10.1038/s41598-024-71040-y
This dataset
Download · which file do I need?

Direct links to NCBI and ENA, no account and no request form. Pick by what you want to do: take the small processed table to look, the supplementary files to re-analyse, or the original raw data to start over.

1 · Just have a look

Processed table

The series matrix: one table of values per sample as the submitters processed it. The smallest download, and it opens in Excel or R. Start here to see what the data look like.

2 · Re-analyse it

Supplementary files

The count tables and other files the authors uploaded. Take only the samples you need, or the whole study as GSE226975_RAW.tar (it can run to tens of gigabytes).

3 · Start from the raw reads

Raw sequencing reads

The original FASTQ files, straight from the sequencer, held at ENA. Large, and you align them yourself, so only choose this if you need to re-process the study from scratch.

What the files usually look like: Look for peak files (.bed, .narrowPeak) and signal tracks (.bigWig) among the supplementary files; the raw reads are on ENA.

Also filed as BioProject PRJNA942338 and SRA study SRP426335. Searching any of these in the dataset finder brings you back here.

Study design
2 × Control cerebral organoid ATAC vs 2 × MECP2 mutant cerebral organoid ATAC vs 2 × Control cerebral organoid GEX vs 2 × MECP2 mutant cerebral organoid GEX

Supports a case/control comparison: 8 samples read as cases, 4 as controls.

How we read this: 4 replicated groups read from 12 sample titles; they account for 8 of them. These groups are guessed from the sample names, not taken from the paper, so check them against the sample list below before relying on them.

Samples in this study
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