Mutation in AMPKγ3 Increases Glycogen and Decreases Triglyceride in Muscle
Author Information
Author(s): Sheila R. Costford, Nihan Kavaslar, Nadav Ahituv, Shehla N. Chaudhry, Wendy S. Schackwitz, Robert Dent, Len A. Pennacchio, Ruth McPherson, Mary-Ellen Harper
Primary Institution: University of Ottawa
Hypothesis
Does the R225W mutation in the AMPKγ3 subunit affect energy metabolism in human skeletal muscle?
Conclusion
The R225W mutation in AMPKγ3 leads to increased muscle glycogen content and decreased intramuscular triglyceride levels.
Supporting Evidence
- The R225W mutation was found in two unrelated families.
- Carriers of the mutation showed a 90% increase in muscle glycogen content.
- AMPK activity was approximately doubled in muscle cells from R225W carriers.
Takeaway
A change in a gene related to energy use in muscles can help muscles store more sugar and less fat.
Methodology
The study involved sequencing the AMPK γ3 gene in obese and lean individuals and analyzing muscle biopsies for AMPK activity, glycogen, and triglyceride content.
Potential Biases
Potential selection bias in participant recruitment from specific clinics.
Limitations
The study had a small sample size for muscle biopsies and did not assess long-term metabolic responses.
Participant Demographics
761 obese and 759 lean Caucasian individuals, mean age around 40 years.
Statistical Information
P-Value
p=0.002 for glycogen content, p=0.032 for IMTG content
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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