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Updated: May 8, 2025
08:04
Isolation of Primary Mouse Hepatocytes for Nascent Protein Synthesis Analysis by Non-radioactive L-azidohomoalanine Labeling Method
Published on: October 23, 2018
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Genetic Variations in GCKR and PNPLA3 Regulate Metabolic Balance Across the Liver
Yunyun Ma1, Shiqi Zuo1, Therlinder Lo1
1Department of Population and Public Health Sciences, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA.
Diabetes
|April 24, 2025
Summary
Genetic variations in GCKR and PNPLA3 influence liver fat and insulin resistance, particularly when interacting with dietary fructose. These genes represent key targets for treating hepatic metabolic dysfunction.
Area of Science:
- Genetics
- Metabolism
- Endocrinology
Background:
- Genetic variants in GCK, GCKR, and PNPLA3 are hypothesized to influence metabolic balance, hepatic steatosis, and insulin resistance.
- Previous research has established associations for GCKR rs780094 and PNPLA3 rs738409 with metabolic traits.
Purpose of the Study:
- To investigate the association of GCK, GCKR, and PNPLA3 genetic variants with type 2 diabetes-related phenotypes in Mexican Americans.
- To examine the interaction effects of these genetic variants with dietary fructose and total sugar intake on metabolic health.
- To identify potential therapeutic targets for hepatic metabolic dysfunction.
Main Methods:
- Analysis of genetic variants (GCK rs1799831, GCKR rs780094, PNPLA3 rs738409) in a large cohort of Mexican Americans (BetaGene Study).
- Statistical testing for associations with type 2 diabetes-related phenotypes, including hepatic steatosis and insulin resistance.
- Examination of gene-diet interactions with dietary fructose and total sugar intake.
Main Results:
- GCK rs1799831 showed no association with tested phenotypes or interactions.
- Replication of previous associations for GCKR rs780094 and PNPLA3 rs738409.
- Significant interaction between GCKR rs780094 and dietary fructose affecting glucose effectiveness and glucose effectiveness at zero insulin.
- Significant interaction between GCKR rs780094 and PNPLA3 rs738409 associated with type 2 diabetes traits, including insulin sensitivity.
Conclusions:
- Genetic variations in GCKR and PNPLA3, along with their interactions with each other and dietary fructose, partially determine hepatic fat accumulation.
- These interactions likely alter metabolic pathway contributions in the liver, leading to hepatic steatosis and insulin resistance.
- GCKR and PNPLA3 are identified as crucial therapeutic targets for mitigating hepatic metabolic dysfunction.
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