Cycloaddition enabled mutational profiling of 5-vinyluridine in RNA

Area of Science:

• Biochemistry
• Molecular Biology
• RNA Modification

Background:

• RNA modifications play crucial roles in gene regulation and cellular function.
• Detecting modified nucleosides like 5-vinyluridine (5-VUrd) is essential for understanding their biological impact.
• Current methods for RNA analysis may lack the resolution or specificity to identify certain modifications.

Purpose of the Study:

• To report a novel method for detecting 5-vinyluridine (5-VUrd) in RNA.
• To achieve single nucleotide resolution in identifying 5-VUrd.
• To characterize the effects of 5-VUrd on reverse transcription.

Main Methods:

• Utilizing mutational profiling to detect 5-vinyluridine.
• Employing maleimide chemistry to create cycloadducts with 5-VUrd in RNA.
• Analyzing primer extension during reverse transcription to identify modification sites.
• Sequencing cDNA products to detect misincorporations caused by the cycloadduct.

Main Results:

• Successfully detected 5-vinyluridine (5-VUrd) in RNA at single nucleotide resolution.
• Observed that maleimide-induced cycloadducts with 5-VUrd cause premature termination of primer extension during reverse transcription.
• Found misincorporations in the full-length cDNA product across the 5-VUrd cycloadduct site.

Conclusions:

• Mutational profiling provides a sensitive approach for detecting 5-vinyluridine in RNA.
• The observed reverse transcription artifacts serve as reliable indicators of 5-VUrd presence.
• This method enables precise mapping of 5-VUrd modifications within RNA molecules.