Evaluation of the thermal stabilization of triplex DNA by flavonoids

Poster Number

24B

Lead Author Major

Pre-Pharmacy

Lead Author Status

Junior

Second Author Major

Biochemistry

Second Author Status

Sophomore

Third Author Major

Bioengineering

Third Author Status

Senior

Fourth Author Major

Biochemistry

Fourth Author Status

Senior

Format

Poster Presentation

Faculty Mentor Name

Dr. Liang Xue

Faculty Mentor Department

Department of Chemistry

Graduate Student Mentor Name

Landy Gu

Graduate Student Mentor Department

Department of Chemistry

Additional Mentors

Dr. Vanessa M. Rangel, v_rangel1@u.pacific.edu, Chemistry Department

Nghia Tran, n_tran44@u.pacific.edu, Chemistry Department

Abstract/Artist Statement

Triplex DNA is a structure consisting of a third strand, referred to as a triplex-forming oligonucleotide (TFO), that binds to the double helix of DNA in the major groove via Hoogsteen H-bonding. The formation of triplex DNA follows specific base pairing rules. The binding of TFO to duplex DNA can interfere with the binding of nucleic acid processing proteins to the same region and consequently regulate DNA replication and transcription. Triplex DNA formation has been recognized as a promising approach in antigene therapy. However, triplex DNA has a slower formation rate than its duplex counterpart and is relatively unstable due to charge repulsion between three DNA backbones. Nonetheless, the stability of triplex-DNA can be enhanced by small molecules that specifically bind to the DNA triplex and increase its stability. Our lab recently discovered that certain flavonoids exhibit a stabilizing effect on triplex DNA but minimal impact on duplex DNA. This phenomenon is pH-dependent. Flavonoids are natural products that can be found in fruits, vegetables, grains, etc., and have shown anti-oxidative, anti-inflammatory, and anti-carcinogenic properties. In this study, we conducted a comprehensive investigation into the thermal stabilization of triplex DNA with commercially available flavonoids at different pHs monitored by UV. We also examined the effect of structure on the stabilization of triplex DNA.

Location

Information Commons, William Knox Holt Memorial Library and Learning Center

Start Date

29-4-2023 10:00 AM

End Date

29-4-2023 1:00 PM

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Apr 29th, 10:00 AM Apr 29th, 1:00 PM

Evaluation of the thermal stabilization of triplex DNA by flavonoids

Information Commons, William Knox Holt Memorial Library and Learning Center

Triplex DNA is a structure consisting of a third strand, referred to as a triplex-forming oligonucleotide (TFO), that binds to the double helix of DNA in the major groove via Hoogsteen H-bonding. The formation of triplex DNA follows specific base pairing rules. The binding of TFO to duplex DNA can interfere with the binding of nucleic acid processing proteins to the same region and consequently regulate DNA replication and transcription. Triplex DNA formation has been recognized as a promising approach in antigene therapy. However, triplex DNA has a slower formation rate than its duplex counterpart and is relatively unstable due to charge repulsion between three DNA backbones. Nonetheless, the stability of triplex-DNA can be enhanced by small molecules that specifically bind to the DNA triplex and increase its stability. Our lab recently discovered that certain flavonoids exhibit a stabilizing effect on triplex DNA but minimal impact on duplex DNA. This phenomenon is pH-dependent. Flavonoids are natural products that can be found in fruits, vegetables, grains, etc., and have shown anti-oxidative, anti-inflammatory, and anti-carcinogenic properties. In this study, we conducted a comprehensive investigation into the thermal stabilization of triplex DNA with commercially available flavonoids at different pHs monitored by UV. We also examined the effect of structure on the stabilization of triplex DNA.