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Related Experiment Videos

Triplex targets in the human rhodopsin gene

B D Perkins1, J H Wilson, T G Wensel

  • 1Verna and Marrs McLean Department of Biochemistry, Baylor College of Medicine, Houston, Texas 77030, USA.

Biochemistry
|August 12, 1998
PubMed
Summary

Triplex technology shows promise for targeting the human rhodopsin gene, implicated in autosomal dominant retinitis pigmentosa. This study refines methods for identifying and utilizing high-affinity triplex-forming oligonucleotide (TFO) binding sites in genes.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Autosomal dominant retinitis pigmentosa (ADRP) is a genetic disorder linked to the human rhodopsin gene.
  • The human rhodopsin gene encodes a G-protein-linked receptor crucial for vision.
  • Triplex technology offers a potential strategy for gene targeting.

Purpose of the Study:

  • To explore the application of triplex technology to the human rhodopsin gene.
  • To identify and characterize high-affinity triplex-forming oligonucleotide (TFO) binding sites within the rhodopsin gene.
  • To refine the rules for identifying and targeting TFOs to specific DNA sequences.

Main Methods:

  • Computer-based search for potential triplex-forming sites (≥15 nucleotides, >80% purine) in the rhodopsin gene.

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  • Plasmid binding assays to screen selected potential target sites.
  • Comparison of purine (GA) and mixed (GT) TFO binding affinities and sensitivities.

    • Main Results:

    • 143 distinct potential triplex sites were identified in the rhodopsin gene.
    • 8 out of 17 screened sites demonstrated submicromolar TFO binding affinity (Kd = 10⁻⁹–10⁻⁷ M).
    • Purine (GA) TFOs exhibited higher binding affinity and greater tolerance to sequence variations compared to mixed (GT) TFOs.
    • High guanine content (>54%) in target sites correlated with high-affinity TFO binding (Kd ≤ 10⁻⁸ M).

    Conclusions:

    • The human rhodopsin gene contains numerous high-affinity triplex-forming sites.
    • The study refines criteria for predicting and successfully targeting TFO binding sites.
    • GA-TFOs are more effective for targeting high-affinity sites in the rhodopsin gene, particularly those rich in guanine.