The Study
Upstream transcription factor 1 gene polymorphisms are associated with high antilipolytic insulin sensitivity and show gene–gene interactions
This study looked at people's genes and their body measurements, like how their fat and sugar levels changed after eating sugar. It found that some gene versions were more common in people with better sugar control, but it didn't change anyone's genes or diet to see if that caused the difference.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
Some people have special gene versions that make their fat cells respond more strongly to insulin — meaning insulin shuts down fat release better in them.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 533 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — better insulin control of fat release may protect against obesity and fatty liver, but only if other genes are also favorable.
- 2People with the USF1 T and A gene versions had 2% lower fat levels after drinking sugar water (p=0.01) and showed 3% higher insulin sensitivity in fat tissue (p=0.03).
- 3Those with two normal USF1 genes plus the LIPC T gene had more liver fat (p=0.01).
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Journal of Molecular Medicine
Year
2006
Authors
K. Kantartzis, A. Fritsche, F. Machicao, M. Stumvoll, J. Machann, F. Schick, H. Häring, N. Stefan
Related Content
Claims (6)
When insulin levels rise, it reduces the breakdown of fat in fat cells by suppressing the enzyme hormone-sensitive lipase.
Certain variations in the USF1 gene are linked to a larger decrease in free fatty acids in the blood during a glucose tolerance test in Caucasian adults, suggesting these genetic differences affect how insulin controls fat breakdown in fat tissue.
People with two specific genetic variants in the USF1 gene show a stronger reduction in fat release from fat cells when insulin is present, and their bodies respond more effectively to insulin in metabolic tests, suggesting these variants are linked to better fat regulation under insulin control.
People with specific combinations of genetic variants in the USF1 and LIPC genes have been observed to have higher levels of fat in their liver, as measured by a specialized imaging technique, which may indicate a higher likelihood of developing fatty liver disease.
Genetic variations in the USF1 gene affect how insulin suppresses fat breakdown, but this effect does not change based on whether a person also has a specific variation in the HSL gene.
Specific variations in the USF1 gene are linked to higher fat breakdown in response to stress hormones in fat cells grown in the lab, and also to greater reduction of fat breakdown when insulin is present in humans.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.