Choline's role in maintaining liver function: new evidence for epigenetic mechanisms

Curr Opin Clin Nutr Metab Care. 2013 May;16(3):339-45. doi: 10.1097/MCO.0b013e3283600d46.

Abstract

Purpose of review: Humans eating diets low in choline develop fatty liver and liver damage. Rodents fed choline-methionine-deficient diets not only develop fatty liver, but also progress to develop fibrosis and hepatocarcinoma. This review focuses on the role of choline in liver function, with special emphasis on the epigenetic mechanisms of action.

Recent findings: Dietary intake of methyl donors like choline influences the methylation of DNA and histones, thereby altering the epigenetic regulation of gene expression. The liver is the major organ within which methylation reactions occur, and many of the hepatic genes involved in pathways for the development of fatty liver, hepatic fibrosis, and hepatocarcinomas are epigenetically regulated.

Summary: Dietary intake of choline varies over a three-fold range and many humans have genetic polymorphisms that increase their demand for choline. Choline is an important methyl donor needed for the generation of S-adenosylmethionine. Dietary choline intake is an important modifier of epigenetic marks on DNA and histones, and thereby modulates the gene expression in many of the pathways involved in liver function and dysfunction.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Animals
  • Choline / pharmacology*
  • DNA Methylation
  • Diet
  • Epigenesis, Genetic*
  • Fatty Liver / drug therapy
  • Fatty Liver / metabolism
  • Folic Acid / pharmacology
  • Gene Expression
  • Histones / genetics
  • Histones / metabolism
  • Humans
  • Liver / metabolism*
  • Liver Cirrhosis / drug therapy
  • Liver Cirrhosis / metabolism
  • Models, Animal
  • Polymorphism, Genetic
  • S-Adenosylmethionine / pharmacology

Substances

  • Histones
  • S-Adenosylmethionine
  • Folic Acid
  • Choline