Gene Expression Changes Predict Obesity in Mice
Author Information
Author(s): Koza Robert A, Nikonova Larissa, Hogan Jessica, Rim Jong-Seop, Mendoza Tamra, Faulk Christopher, Skaf Jihad, Kozak Leslie P
Primary Institution: Pennington Biomedical Research Center
Hypothesis
Phenotypic variation in diet-induced obesity among genetically identical mice is determined by stable epigenetic modifications.
Conclusion
The study found that genetically identical mice show significant variability in obesity phenotypes, which can be detected early in life and is linked to gene expression changes.
Supporting Evidence
- Genetically identical mice showed a 4-fold difference in fat mass after 4 weeks on a high-fat diet.
- Variability in fat mass was primarily due to changes in adiposity rather than lean body mass.
- Gene expression changes in adipose tissue were linked to differences in obesity phenotypes.
- Leptin levels were significantly correlated with adiposity in the mice.
Takeaway
Some mice get fatter than others even when they eat the same food, and scientists think this is because of changes in their genes that happen before they start eating a lot of fat.
Methodology
The study used microarray analysis and qRT-PCR to assess gene expression in adipose tissue and hypothalamus of mice fed different diets.
Potential Biases
Potential bias due to the controlled environment and specific dietary conditions that may not reflect natural settings.
Limitations
The study primarily focused on male C57BL/6J mice, which may limit the generalizability of the findings to other strains or sexes.
Participant Demographics
Male C57BL/6J inbred mice.
Statistical Information
P-Value
0.0105
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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