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Interactions Between Dietary Metabolites and Regulatory Risk Variants for Human Colon Cancer.

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Dietary metabolites like butyrate and deoxycholic acid interact with genetic variants to influence colorectal cancer (CRC) risk. These interactions can alter gene expression, potentially leading to cancer development.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cancer Research

Background:

  • Genetic variants in noncoding DNA are linked to colorectal cancer (CRC) susceptibility.
  • These regulatory regions may interact with dietary factors to influence gene expression and cancer risk.

Purpose of the Study:

  • To investigate the impact of CRC-associated dietary metabolites on regulatory variants.
  • To identify gene-environment interactions (GxE) influencing CRC risk.

Main Methods:

  • Utilized massively parallel reporter assays (MPRA) to test 3703 CRC-associated variants.
  • Assessed the effects of butyrate and deoxycholic acid on variant activity in human colonic cells.

Main Results:

  • Identified 1595 variant-dietary metabolite interactions.
  • Observed dysregulation of genes including MED13L, NKD2, and Wnt/β-catenin signaling modulators.
  • Uncovered opposing effects of butyrate and deoxycholic acid on specific loci, implicating FOSL1 and SP1.

Conclusions:

  • Dietary metabolites interact with CRC genetic risk loci, influencing gene expression.
  • These findings highlight potential gene-environment interactions in CRC etiology.
  • MPRA coupled with environmental factors provides a method to study GxE in common cancers.