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Exploring the Stability of Genomic Imprinting and X-Chromosome Inactivation in the Aged Brain (RNA-Seq)

GSE232546 Mus musculus (mouse) RNA-seq (gene expression) 11 samples Submitted 2024/07/15 Platform GPL13112
At a glance

RNA-seq (gene expression) · mouse · 11 samples

What it is
RNA-seq (gene expression)Gene activity measured by sequencing. The summary does not mention single-cell work, so this is most likely bulk: one average per sample, the usual starting point for comparing groups.
Organism
Mus musculus (mouse)
Samples
11 samples: 11 samples, each with a distinct title — no replicated groupsGroups 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.
Summary (written by the submitters)
DNA methylation is a common mechanism regulating monoallelic expression of different genes, including imprinted genes. How age-induced alterations of methylation levels vary across alleles and impact on monoallelic expression is unknown. In the brain, this phenomenon may contribute mechanistically to neuronal dysfunction and disease. In order to investigate the allele specific transcriptional and epigenetic signatures of aging, we used key brain areas, hippocampus and cerebellum, of juvenile and old hybrid mice obtained from BL6×CAST/EiJ (CAST) reciprocal crosses.
Read the full summary ↓
We set out to explore whether epigenetic drift affects global DNA methylation machinery by investigating 5- methylcytosine (5-mC) and 5-hydroxymethylcytosine (5-hmC) levels. Mass spectrometry analysis showed a significant increase of 5hmC levels in hippocampus of old mice, but this was not accompanied by measurable differences in methylating and demethylating enzymes. The expression of several repetitive elements (LINEs, SINEs, IAP) was also analysed, strictly dependent on 5mC and 5hmC levels, and reporting a reduction of the intracisternal A-particle (IAP) retrotransposons in HCP of old mice. We uncovered the allelic-specific DNA methylation profile of aging using genomic imprinting as a read-out by IMPLICON and allelic expression by RNA sequencing. Here, imprinting is not substantially changed during aging, not affecting their normal monoallelic expression. This work provides the first epigenetic and transcriptional landscape of aging with allelic resolution and confirms that genomic imprinting is a stable epigenetic phenomenon across the whole lifespan.
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 GSE232546_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: For RNA-seq the counts are usually a table among the supplementary files (look for 'counts', 'expression', 'FPKM' or 'TPM' in the file name). The series matrix of a sequencing study is sometimes nearly empty.

Also filed as BioProject PRJNA972706 and SRA study SRP437724. Searching any of these in the dataset finder brings you back here.

Study design
11 samples, each with a distinct title — no replicated groups

Any grouping that defines a comparison lives in the sample characteristics, which GEO records separately from the titles.

How we read this: Read from 11 sample titles: 11 distinct titles with little repetition. 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
Datasets on a similar topic

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Metadata from NCBI GEO, cached and refreshed periodically — the NCBI page above is authoritative. Downloads link straight to NCBI/ENA; nothing is proxied through BioTransfer.