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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →A 2026 study identifies the mitochondrial transporter SLC25A34 as a possible link between circadian timing, dietary signals and brown-fat metabolism. Experiments in mice and cells suggest the transporter helps coordinate fat building and fat burning, but the proposed transport mechanism is not yet directly confirmed—and the findings do not show that changing meal times, eating a particular diet or using cold exposure causes weight loss in people.
What is SLC25A34?
SLC25A34 is an orphan mitochondrial carrier: a protein in the mitochondrial transporter family whose function has not been fully established. A 2026 paper in Science implicates it in the metabolism of adipocytes, the cells that store and use fat. The study was led by researchers at the University of Copenhagen’s Novo Nordisk Foundation Center for Basic Metabolic Research with international collaborators. The publication record lists Iuliia Karavaeva as first author and Zachary Gerhart-Hines as corresponding author (Broad Institute publication record; paper page at PubMed Central).
The work focuses especially on brown adipose tissue, or brown fat, which can use stored fuels to generate heat. The researchers report that SLC25A34 expression in brown fat responds to several kinds of signals, rather than operating independently of the body’s state.
How do body-clock, temperature and dietary signals relate to fat burning?
The study reports that the circadian repressor REV-ERBα regulates SLC25A34 expression, linking the transporter to circadian timing. It also connects expression to PPARα-associated responses to lipolytic signals, dietary fat and cold. These results suggest that timing, temperature and fuel-related cues converge on the transporter in brown fat; they do not establish a practical schedule or diet for changing fat loss in people.
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One striking figure comes from mice: according to the University of Copenhagen’s account of the study, SLC25A34 levels in mouse brown fat rose 90-fold after 24 hours in cold. That is a change in transporter levels in mouse tissue under a specific exposure, not a measure of calories burned or weight lost by people (University of Copenhagen account, 1 October 2026).
What mechanism do the researchers propose?
The authors propose that SLC25A34 imports oxaloacetate into mitochondria. In their model, this would help sustain the exchange of metabolites that supports acetyl-CoA production in the cytosol, lipid synthesis and mitochondrial lipid oxidation. The proposed pathway could help explain how brown fat builds and breaks down lipids while supporting thermogenic metabolism.
That mechanism remains a proposal, not a directly demonstrated transport reaction: the University of Copenhagen account says the researchers have not directly observed SLC25A34 transporting oxaloacetate. The paper therefore supports a functional role for the transporter in experimental systems more strongly than it establishes the precise molecule it carries.
What did the experiments find?
Mouse and cultured-cell experiments
Researchers reduced SLC25A34 in cultured brown-fat cells and observed changes in oxaloacetate distribution, lipid synthesis, oxygen consumption and the expression of fuel-burning genes. In mice in which the transporter was switched off in brown fat, the fat-burning response was weaker. These interventions support a role in the tested mouse and cell systems; they do not establish an obesity treatment or a human weight-loss effect.
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Cells grown from human donors
The human-cell experiments used brown-fat cells grown from four donors, not participants in a clinical treatment trial. Reducing SLC25A34 lowered fuel-burning capacity in cells from three of the four donors and dampened energy-expenditure-related gene expression in all four. The small donor sample is useful as an initial human-cell observation, but it cannot show what manipulating the transporter would do in a person.
Observational data from human fat
The researchers also pooled existing data from 24 clinical studies. In subcutaneous white fat, higher SLC25A34 levels were associated with several more favorable metabolic markers; the same association was not found in fat around abdominal organs. This is an analysis of associations across existing studies, not 24 trials that altered SLC25A34. It cannot establish that higher transporter levels caused the markers or that changing those levels would improve health.
Does the study show that meal timing or cold exposure causes weight loss?
No. The study does not show that changing meal timing, eating a high-fat diet or exposing yourself to cold will manipulate SLC25A34 in a way that causes fat loss in people. Its main functional evidence comes from mouse and cell experiments, while the human findings are limited to donor-derived cells and observational tissue data. The sources report no human weight-loss effect size or population-level statistic establishing a clinical benefit.
Nor do these findings establish a supplement, consumer device, diet product or cold-exposure product as a way to target the transporter. Translating the mechanism into a safe and effective intervention would require evidence beyond the experiments and associations reported in this study.
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What remains unknown?
- The transporter’s direct substrate: oxaloacetate transport is proposed but has not been directly observed.
- Long-term consequences: the University of Copenhagen account says long-term effects of transporter loss on body weight and metabolic health have not been tested.
- Effects in people: the reported human evidence does not establish that manipulating SLC25A34 changes fat burning, weight or metabolic health in people.
- Its role outside brown fat: the study’s first author notes that SLC25A34 is also highly expressed in the heart, but its function there remains unknown.
Why the finding matters
SLC25A34 offers researchers a candidate mechanism for studying how circadian regulation, temperature and dietary or lipolytic signals intersect in brown-fat metabolism. The experiments suggest that this mitochondrial carrier participates in both lipid building and fuel use. For now, its significance is a research finding about biology—not evidence-based guidance for losing weight.
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