Illustrating the Epitranscriptome at Nucleotide Resolution Using Methylation-iCLIP (miCLIP)

Area of Science:

• Molecular Genetics
• RNA Biology
• Epitranscriptomics

Background:

• Next-generation sequencing (NGS) has revolutionized transcriptome profiling, revealing insights into gene transcription, RNA processing, and splicing.
• Individual nucleotide resolution crosslinking immunoprecipitation (iCLIP) enables high-resolution analysis of protein-RNA interactions, uncovering regulatory mechanisms.
• Recent advancements have adapted iCLIP to profile RNA modifications, leading to techniques like methylation-iCLIP (miCLIP).

Purpose of the Study:

• To describe the m5C-miCLIP protocol for nucleotide-resolution mapping of methyl-5-cytosine (m5C) RNA modifications.
• To explain how m5C-miCLIP generates detailed RNA modification maps.
• To highlight the contribution of these maps to the emerging field of epitranscriptomics.

Main Methods:

• Adaptation of the individual nucleotide resolution crosslinking immunoprecipitation (iCLIP) technique.
• Development of methylation-specific immunoprecipitation for RNA.
• Application of sequencing to profile modified RNA bases at nucleotide resolution.

Main Results:

• Successful implementation of the m5C-miCLIP protocol.
• Generation of nucleotide-resolution maps of m5C modifications in the human transcriptome.
• Demonstration of miCLIP variants' utility in mapping both m5C and m6A modifications.

Conclusions:

• The m5C-miCLIP protocol provides a powerful tool for studying RNA methylation.
• Nucleotide-resolution RNA modification maps are crucial for understanding epitranscriptomic regulation.
• This work significantly contributes to the advancement of molecular genetics and epitranscriptomics research.