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Cathepsin L-Dependent Positive Selection Shapes Clonal Composition and Functional Fitness of CD4 T Cells [RNA]

GSE269197 Mus musculus (mouse) RNA-seq (gene expression) 13 samples Submitted 2025/07/09 Platform GPL24247
At a glance

RNA-seq (gene expression) · mouse · 13 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
13 samples: 7 × M2_CtslΔTEC mouse vs 6 × M2_WT mouseGroups 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
Cathepsin L-dependent positive selection shapes clonal composition and functional fitness of CD4(+) T cellsNature immunology · 2025
Summary (written by the submitters)
The physiological significance of thymic positive selection and its reliance on a single stromal cell type, cortical thymic epithelial cells (cTECs), remain poorly understood. Cathepsin L (Ctsl) has been implicated in generating MHCII-bound peptides in cTECs for efficient CD4 T cell differentiation. Here, we addressed whether Ctsl-deficiency impacts the CD4 compartment not only numerically, but also qualitatively.
Read the full summary ↓
When Ctsl is absent, many TCRs disappear from the repertoire due to a genuine defect in positive selection, while some allegedly ‘Ctsl-independent’ TCRs are retained. We demonstrate that these clones experience weaker positively selecting signals in absence of Ctsl, which suffice for further maturation, yet imprint aberrant responsiveness to agonist stimulation and impaired homeostatic behavior. Hence, the Ctsl-generated peptidome in cTECs engenders TCR-pMHCII interactions at the upper end of the permissible affinity spectrum to optimize both CD4 T cell diversity and functionality.
Published in
Cathepsin L-dependent positive selection shapes clonal composition and functional fitness of CD4(+) T cells
Petrozziello E, Sayed A, Freitas JA et al. · Nature immunology 2025 · PMID 40514418 · doi:10.1038/s41590-025-02182-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 GSE269197_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 PRJNA1120487 and SRA study SRP512065. Searching any of these in the dataset finder brings you back here.

Study design
7 × M2_CtslΔTEC mouse vs 6 × M2_WT mouse

Supports a between-group comparison across 13 samples.

How we read this: 2 replicated groups read from 13 sample titles; they account for 13 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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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.