Systematic calibration of epitranscriptomic maps using a synthetic modification-free RNA library

Area of Science:

• Molecular Biology
• Genomics
• Biochemistry

Background:

• Epitranscriptomics studies RNA modifications, crucial for gene expression regulation.
• Current sequencing technologies for mapping RNA modifications yield contradictory results, questioning biological impacts.
• Accurate mapping of RNA modifications is essential for understanding epitranscriptome function.

Purpose of the Study:

• To develop a method for calibrating RNA modification mapping techniques.
• To identify and mitigate false positives in epitranscriptomic data.
• To enable precise and quantitative analysis of RNA modifications.

Main Methods:

• Creation of a synthetic, modification-free RNA library mirroring the endogenous transcriptome.
• Utilizing the library as a negative control in established RNA mapping techniques.
• Analyzing false positives arising from sequence bias and RNA structure.

Main Results:

• The modification-free RNA library effectively revealed false positives in existing mapping techniques.
• Calibration using this negative control improved the precision and quantitation of RNA modification mapping.
• Accurate mapping data was obtained for N6-methyladenosine (m6A) and 5-methylcytosine (m5C).

Conclusions:

• The developed approach offers a systematic solution for calibrating various RNA modification mapping methods.
• This method enhances the reliability and accuracy of epitranscriptomic studies.
• Precise mapping expands the understanding of key RNA modifications and their biological roles.