MOTS-C: 12S rRNA Origin and Defined Cell and Mouse Study Records

Research use only. This article summarizes named research records and does not provide medical, veterinary, dosing, administration, safety, or outcome guidance.

MOTS-c origin in mitochondrial 12S rRNA

Lee et al. reported a 51-base-pair short open reading frame within mitochondrial 12S rRNA that, under the mitochondrial genetic code, encodes the 16-amino-acid peptide they named MOTS-c [1]. This is the identity claim supported by the paper: the sequence location, coding interpretation, peptide length, and name are all attributes of the authors’ mitochondrial-DNA record.

The authors used several measurements to examine that record. Their Figure 1 compares HeLa cells with HeLa-rho0 cells that lack mitochondrial DNA, using qRT-PCR for 12S rRNA and MOTS-c transcripts, immunoblotting for peptide detection, and immunocytochemistry. The same figure reports immunostaining in HEK293 cells and detection measurements in mouse and rat tissues and in human and rodent plasma. These observations establish which biological materials and assays the authors used; they do not identify the material, composition, purity, or handling history of an external catalogue item.

Merry et al. later reviewed mitochondrial-derived peptides and likewise described the mitochondrial 12S rRNA gene (MT-RNR1) as the sequence location for MOTS-c, while distinguishing it from humanin and the small humanin-like peptides encoded in 16S rRNA [2]. That review provides a second bibliographic source for the naming and gene-location context. It is not a replacement for the methods, comparison groups, or measurements in Lee et al.

HEK293 cell records in the primary study

Lee et al. reported microarray analyses in HEK293 cells at 4 and 72 hours, comparing MOTS-c study conditions with control cells at the same time points [1]. They also reported untargeted metabolomics in HEK293 cells at 24 and 72 hours and in a stable MOTS-c expression system, with the corresponding control comparison stated in the figure legend. The article describes these as gene-expression and metabolite measurements within defined cell systems; the reported changes belong to those systems and time points.

For the methionine-folate and de novo purine pathways, the primary paper reports mass-spectrometry measurements of metabolites and microarray measurements of selected enzymes in the stable-expression cells. The authors also report AMPK Thr172 and Akt Ser473 phosphorylation measurements in HEK293 cells. These are named molecular readouts, not a general property of every material labelled MOTS-C. The paper’s cellular results do not establish a result in another cell type, another tissue, a mouse experiment, or a separate material record.

The paper also reports extracellular acidification-rate and oxygen-consumption-rate measurements in its stable-expression cell system, together with comparisons involving folic acid, AMPK-directed siRNAs, and compound C [1]. Those comparison conditions are part of the reported experimental design. They should remain attached to the authors’ cell system and readouts rather than being condensed into a claim about a catalogue product.

Mouse study records in the primary study

In one mouse experiment, Lee et al. used male C57BL/6 mice, including a high-fat-diet group, and reported a seven-day experimental comparison. The listed measurements were an intraperitoneal glucose-tolerance test, euglycemic-hyperinsulinemic clamp readouts, glucose infusion rate, insulin-stimulated glucose-disposal rate, hepatic glucose production, and skeletal-muscle Akt Ser473 phosphorylation [1]. The article assigns these readouts to the stated mouse groups and collection context.

A separate set of figures reports young and aged C57BL/6 cohorts for measurements of MOTS-c in skeletal muscle and circulation. The paper also reports an ex vivo soleus-muscle 2-deoxyglucose-uptake measurement after the experimental comparison. These are not interchangeable with the HEK293 assays: the species, tissue, collection context, and measurement type differ.

For a second diet-associated mouse record, the authors used male CD-1 mice and compared high-fat-diet and matched-control-diet groups over the reported study period. Figure 6 lists body weight, food and caloric intake, glucose and insulin measurements at euthanasia, liver hematoxylin-and-eosin staining, skeletal-muscle AMPK Thr172 phosphorylation, GLUT4 measurements, respiratory-exchange ratio, and body-heat production [1]. This paragraph reports the authors’ named groups and measurements only. It does not turn those study observations into a recommendation, an expected outcome, or a claim about human, veterinary, or other animal use.

What this source supports and what it does not

PMID 25738459 directly supports the 12S-rRNA origin of the name MOTS-c, the 16-amino-acid peptide identity reported by the authors, and the defined cell and mouse study records above. The paper does not provide an analytical certificate, lot number, purity value, stability result, or receiving record for MOTS-C 10mg. A research material and the material described in a publication are therefore separate records unless a source explicitly connects them.

The article’s results are confined to the systems, comparisons, and time points reported by Lee et al. The HEK293 assays, HeLa/HeLa-rho0 identity measurements, C57BL/6 experiments, and CD-1 experiments answer different questions. None establishes the same observation in an unreported model or in a catalogue batch.

Related MOTS-C source scope

MOTS-C: Classifying Evidence by Research Model addresses broader model categories. The record here is narrower: it traces the 12S-rRNA identity claim and the named cell and mouse measurements in PMID 25738459. The related product page identifies a catalogue item; it does not reproduce the study material or the authors’ measurements.