Multiplexed, UVC-induced, sequence-dependent DNA damage detection

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• Ultraviolet (UV) radiation induces DNA damage, necessitating methods for simultaneous analysis of multiple DNA sequences.
• Existing analytical techniques may not efficiently detect sequence-dependent UV damage across numerous DNA samples.

Purpose of the Study:

• To develop a high-throughput assay for quantifying UVC-induced DNA damage in multiple oligonucleotides.
• To utilize smart probes, a novel type of molecular beacon, for sensitive and sequence-specific damage detection.

Main Methods:

• A 96-well plate assay combined with an automated sample mover was employed for simultaneous analysis.
• UVC-induced DNA damage was quantified using smart probes where guanosine acts as a fluorescence quencher.

Main Results:

• The developed method provides reproducible oligonucleotide damage constants comparable to traditional cuvette methods.
• A calibration curve for poly-dT demonstrated good linearity (R(2) = 0.96) with limits of detection (LOD) and quantification (LOQ) of 55 and 183 nm, respectively.
• Damage kinetics varied based on DNA sequence and photoproducts, with guanine-containing poly-A oligonucleotides showing faster damage rates.

Conclusions:

• The 96-well plate assay with smart probes offers a simple, rapid, and inexpensive method for multiplexed, sequence-specific DNA damage detection.
• This technique enables efficient analysis of UV-induced DNA damage across various sequences.
• The findings highlight the sequence-dependent nature of UV DNA damage kinetics.