A Ghrelin Receptor Variant Promotes Fat Storage by Changing How Nutrients Are Partitioned
The GhsrQ343X allele favors fat storage over lean mass by acting on nutrient partitioning through the constitutively active ghrelin receptor, independent of ghrelin hormone levels.
Quick Facts
What This Study Found
GhsrQ343X allele alters nutrient partitioning to favor fat storage through constitutive GHSR activity, independent of ghrelin-mediated effects. Demonstrates that GHSR baseline signaling independently regulates metabolic programming.
Key Numbers
GhsrQ343X mutation; preferential CHO oxidation; no change in intake/expenditure/activity; increased LEAP2:ghrelin ratio; increased hypothalamic Ghsr
How They Did This
Genetic and metabolic study. GhsrQ343X allele characterization. Nutrient partitioning analysis. Fat vs lean mass composition. Constitutive GHSR activity assessment independent of ghrelin.
Why This Research Matters
Understanding why some people store fat more easily despite similar diets could explain individual obesity susceptibility. GHSR constitutive activity — without ghrelin — may be an underappreciated driver of body composition.
The Bigger Picture
GHSR constitutive activity is emerging as important as ghrelin-mediated activation. Drugs targeting constitutive GHSR activity (inverse agonists) could address obesity independently of ghrelin signaling.
What This Study Doesn't Tell Us
Genetic variant study — population frequency and clinical impact need characterization. Mechanistic details of nutrient partitioning not fully elucidated. Translation from model to human phenotype needs confirmation.
Questions This Raises
- ?How common is the Q343X allele in human populations?
- ?Could GHSR inverse agonists prevent excess fat storage in carriers?
- ?Does this explain some cases of obesity-resistant thinness or obesity-prone weight gain?
Trust & Context
- Key Stat:
- Fat storage without hunger This GHSR variant promotes fat storage not by increasing appetite but by changing how the body distributes nutrients — a ghrelin-independent metabolic effect
- Evidence Grade:
- Moderate evidence: genetic study with metabolic phenotyping demonstrating constitutive GHSR activity effects on nutrient partitioning.
- Study Age:
- Published 2021. GHSR constitutive activity research continues as a distinct pharmacological target.
- Original Title:
- The GhsrQ343X allele favors the storage of fat by acting on nutrient partitioning.
- Published In:
- The Journal of endocrinology, 251(3), 181–194 (2021)
- Authors:
- Marion, Candice, Zizzari, Philippe(2), Denis, Raphaël G P, Hassouna, Rim, Chebani, Yacine, Leste-Lasserre, Thierry, Doat, Hélène, Le Pen, Gwenaëlle, Cota, Daniela, Noble, Florence, Luquet, Serge, Pantel, Jacques
- Database ID:
- RPEP-05581
Evidence Hierarchy
Frequently Asked Questions
Can your genes make you store more fat?
Yes — this study shows a variant in the ghrelin receptor gene changes how the body partitions nutrients: more toward fat and less toward lean tissue. This occurs even without changes in appetite or food intake, through the receptor's baseline (constitutive) activity.
What is constitutive receptor activity?
Most receptors sit idle until a hormone activates them. The ghrelin receptor is unusual — it's partially active even without ghrelin. This baseline activity affects metabolism independently. The Q343X variant alters this baseline, shifting the body toward fat storage.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-05581APA
Marion, Candice; Zizzari, Philippe; Denis, Raphaël G P; Hassouna, Rim; Chebani, Yacine; Leste-Lasserre, Thierry; Doat, Hélène; Le Pen, Gwenaëlle; Cota, Daniela; Noble, Florence; Luquet, Serge; Pantel, Jacques. (2021). The GhsrQ343X allele favors the storage of fat by acting on nutrient partitioning.. The Journal of endocrinology, 251(3), 181–194. https://doi.org/10.1530/JOE-20-0576
MLA
Marion, Candice, et al. "The GhsrQ343X allele favors the storage of fat by acting on nutrient partitioning.." The Journal of endocrinology, 2021. https://doi.org/10.1530/JOE-20-0576
RethinkPeptides
RethinkPeptides Research Database. "The GhsrQ343X allele favors the storage of fat by acting on ..." RPEP-05581. Retrieved from https://rethinkpeptides.com/research/marion-2021-the-ghsrq343x-allele-favors
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.