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Direct mitochondrial import of lactate supports resilient carbohydrate oxidation

GSE276036 Mus musculus (mouse) RNA-seq (gene expression) 25 samples Submitted 2024/11/22 Platform GPL34328
At a glance

RNA-seq (gene expression) · mouse · 25 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
25 samples: 25 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.
Paper
Direct mitochondrial import of lactate supports resilient carbohydrate oxidationbioRxiv : the preprint server for biology · 2024
Summary (written by the submitters)
Lactate is the most abundant circulating metabolic intermediate in mammals and an important energy source for many organs. To use lactate as a fuel, it must be oxidized to pyruvate for entry into the TCA cycle. It is usually described that this reaction occurs in the cytosol and requires the mitochondrial pyruvate carrier (MPC) for pyruvate transport into the mitochondria.
Read the full summary ↓
Here, using 13C stable isotope tracing, we report that lactate can be oxidized in the heart tissue of mice even when the MPC is genetically deleted. MPC-independent lactate import and oxidation within mitochondria is dependent upon the monocarboxylate transporter 1 (MCT1/ Slc16a1). Mitochondria isolated from Mct1iCKO hearts have impaired respiration on lactate but not pyruvate. Lactate import coupled to mitochondrial lactate dehydrogenase activity functions as an electron shuttle which can produce NADH sufficient for respiration even when the TCA cycle is blocked. Cardiac-specific loss of MCT1 leads to rapid decompensation into heart failure with reduced ejection fraction in response to diverse cardiac injuries. Thus, we identify a new mitochondrial electron shuttle that enables the oxidation of lactate and is required to support cardiac energetics under stress conditions.
Published in
Direct mitochondrial import of lactate supports resilient carbohydrate oxidation
Cluntun AA, Visker JR, Velasco-Silva JN et al. · bioRxiv : the preprint server for biology 2024 · PMID 39416192 · doi:10.1101/2024.10.07.617073
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 GSE276036_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 PRJNA1154550 and SRA study SRP529576. Searching any of these in the dataset finder brings you back here.

Study design
25 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 25 sample titles: 25 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
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