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Related Experiment Videos

Functional analysis of human promoter polymorphisms.

Bastiaan Hoogendoorn1, Sharon L Coleman, Carol A Guy

  • 1Department of Psychological Medicine, University of Wales College of Medicine, Heath Park, Cardiff, UK. hoogendoornb@cf.ac.uk

Human Molecular Genetics
|August 14, 2003
PubMed
Summary
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Common genetic variations in gene promoter regions significantly impact gene expression. This study found that approximately 35% of genes harbor single-nucleotide polymorphisms, with a third potentially altering gene function.

Area of Science:

  • Genetics
  • Molecular Biology
  • Human Genomics

Background:

  • The human genome has fewer protein-coding genes than anticipated, highlighting the role of gene regulation in inherited traits and disease susceptibility.
  • Promoter sequences are critical for gene expression and are potential sites for genetic variations (polymorphisms).
  • Previous research lacked large-scale systematic studies on the frequency and functional impact of promoter variants.

Purpose of the Study:

  • To systematically screen promoter regions of selected human genes for common polymorphisms.
  • To assess the functional impact of identified promoter variants on gene expression.
  • To determine the prevalence of functionally relevant promoter polymorphisms.

Main Methods:

  • Screening of the first 500 bp of the 5' flanking region of 170 genes using denaturing high performance liquid chromatography (DHPLC).

Related Experiment Videos

  • Identification of single-nucleotide polymorphisms (SNPs) across 16 chromosomes.
  • Cloning of promoter variants into a reporter gene vector (pGL3) and functional analysis using luciferase reporter assays in three human cell lines (HEK293, JEG, TE671).

    • Main Results:

    • Approximately 35% of the screened genes exhibited single-nucleotide polymorphisms in their promoter regions.
    • Functional assays indicated that about one-third of these promoter variants may significantly alter gene expression.
    • The study identified common promoter polymorphisms with potential functional relevance.

    Conclusions:

    • A substantial proportion of human genes harbor common promoter polymorphisms.
    • These promoter variants can functionally impact gene expression, potentially influencing disease susceptibility and other phenotypes.
    • The findings underscore the importance of studying promoter regions for a comprehensive understanding of genetic variation and its effects.