Detection of UV-induced mutagenic thymine dimer using graphene oxide

Area of Science:

• Biomaterials Science
• Molecular Biology
• Nanotechnology

Background:

• Ultraviolet (UV) radiation induces DNA damage, forming mutagenic lesions.
• Graphene oxide (GO) is a nanomaterial with unique optical and binding properties.
• Detecting UV-induced DNA damage is crucial for understanding mutagenesis and drug development.

Purpose of the Study:

• To investigate the interaction between graphene oxide (GO) and UV-irradiated DNA.
• To develop a sensitive method for detecting mutagenic DNA using GO.
• To assess the potential of GO in screening phototoxic drug candidates.

Main Methods:

• Mixing fluorophore-linked, UV-irradiated DNA with graphene oxide (GO).
• Monitoring changes in fluorescence intensity over time.
• Utilizing GO's fluorescence quenching property to detect DNA adsorption.
• Testing the method's sensitivity and application in drug screening.

Main Results:

• Graphene oxide (GO) showed specific interaction with UV-irradiated DNA, but not intact DNA.
• A time-dependent decrease in fluorescence indicated adsorption of damaged DNA onto GO.
• The method detected UV-irradiated DNA at concentrations as low as 100 pM.
• GO facilitated the analysis of phototoxic drugs' ability to induce DNA mutagens under UV irradiation.

Conclusions:

• Graphene oxide (GO) can selectively bind to and detect mutagenic DNA.
• This GO-based method offers a sensitive, feasible approach for identifying UV-damaged DNA.
• The technique holds promise for accelerating the screening of phototoxic drug candidates.