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Genetic-related and carbohydrate-related factors affecting liver fat accumulation – USC Diabetes & Obesity Research Institute

Genetic-related and carbohydrate-related factors affecting liver fat accumulation

Post: Genetic-related and carbohydrate-related factors affecting liver fat accumulation

Goran MI, Walker R, Allayee H. Genetic-related and carbohydrate-related factors affecting liver fat accumulation. Curr Opin Clin Nutr Metab Care. 2012 Jul; 15(4):392-6.

Purpose of review
To summarize recent findings that have examined dietary, genetic and gene–diet interactions that contribute to fat accumulation in the liver during growth and development, with particular focus on contributions relating to dietary carbohydrate and sugar consumption. In addition, this review highlights how some of these contributions to liver fat vary across the population in terms of ethnic-specific effects.

Recent Findings
Dietary carbohydrate, and especially sugars contribute to increased liver fat accumulation due to the lipogenic potential of fructose during liver metabolism. In addition, recent genome-wide studies have identified several polymorphisms that contribute to increased liver fat accumulation, with some of these genes relating to dietary carbohydrate and sugar consumption. In particular, the patatin-like phospholipase domain-containing protein 3 (PNPLA3) gene, which is highly prevalent in Hispanics, contributes to excessive liver fat beginning at a young age, especially in the context of high sugar consumption.

 Summary
Dietary sugar contributes to liver fat accumulation, with this being explained by de-novo lipogenesis from fructose in the liver. Certain genetic factors, including PNPLA3, glucokinase regulatory protein and APOC3 contribute to increased liver fat accumulation, with these effects being manifested at an early age. Hispanics in particular are at elevated risk for liver fat accumulation because of the higher frequency of genetic variants such as PNPLA3 and glucokinase regulatory protein as well as an interaction between the

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