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Regulatory variation in hepcidin expression as a heritable quantitative trait.

Henry K Bayele1, Surjit K S Srai

  • 1Department of Structural & Molecular Biology, Division of Biosciences, University College London, London, United Kingdom. bayele@biochem.ucl.ac.uk

Biochemical and Biophysical Research Communications
|April 18, 2009
PubMed
Summary

Genetic variations in mouse hepcidin (iron regulator) genes influence iron metabolism. Promoter variations impact gene expression, explaining differences in iron levels between mouse strains and potentially humans.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Physiology

Background:

  • Genetic variation drives phenotypic diversity and complex traits, including diseases.
  • Inter-individual differences in iron metabolism and iron-related disease phenotypes may stem from genetic variations.
  • Hepcidin is a key regulator of iron homeostasis.

Purpose of the Study:

  • To investigate sequence variations in mouse hepcidin genes (mHpc1 and mHpc2) and their promoter activity.
  • To determine if genetic variations in hepcidin influence iron metabolism and related phenotypes.
  • To assess the role of regulatory single nucleotide polymorphisms (SNPs) in hepcidin expression.

Main Methods:

  • Assessed sequence variation in mHpc1 and mHpc2 promoters across different inbred mouse strains.
  • Utilized luciferase reporter assays to measure basal transcription potency of promoter haplotypes.
  • Identified and characterized a regulatory SNP in the mHpc1 promoter affecting transcription factor binding (USF).

Main Results:

  • Discovered multiple SNPs in the promoters of both mHpc1 and mHpc2 genes.
  • Observed significant variation in basal transcription levels of both hepcidin genes.
  • A specific SNP in the mHpc1 promoter altered expression and was responsive to Upstream Stimulatory Factor (USF) transactivation.
  • Inter-strain variations in hepcidin expression correlated with phenotypic differences in iron loading.

Conclusions:

  • Hepcidin expression levels can vary due to genetic regulatory elements in its promoter.
  • Variation in hepcidin expression acts as a quantitative trait influencing iron handling in mice.
  • These findings suggest that regulatory variations in hepcidin expression are crucial for understanding iron metabolism differences and may be relevant to human iron disorders.