MiR&moRe2: A Bioinformatics Tool to Characterize microRNAs and microRNA-Offset RNAs from Small RNA-Seq Data

Area of Science:

• Molecular Biology
• Bioinformatics
• Genomics

Background:

• MicroRNA-offset RNAs (moRNAs) are microRNA-like small RNAs originating from microRNA precursors.
• Knowledge regarding moRNAs and their expression analysis is limited.
• Existing bioinformatics tools for comprehensive small RNA analysis are lacking.

Purpose of the Study:

• To develop the first bioinformatics method, miR&moRe2, for consistent characterization of microRNAs, moRNAs, and their isoforms.
• To demonstrate the discovery power of miR&moRe2 using published datasets.
• To investigate the expression patterns and potential functions of moRNAs and novel microRNAs.

Main Methods:

• Development of miR&moRe2, a novel bioinformatics pipeline for small RNA sequencing data analysis.
• Application of miR&moRe2 to multiple public small RNA datasets.
• Analysis of moRNA and microRNA expression in human blood cell populations.

Main Results:

• miR&moRe2 successfully identified moRNAs consistent with previous findings.
• Newly identified moRNAs and microRNAs were downregulated upon silencing of the microRNA-biogenesis pathway.
• Tens of novel microRNAs and moRNAs were discovered in human blood cells, with cell-type-specific expression variations.

Conclusions:

• miR&moRe2 is a robust tool for comprehensive analysis of small RNAs derived from microRNA precursors.
• The tool facilitates the investigation of microRNA and moRNA biogenesis and function.
• miR&moRe2 aids in the discovery of novel small RNAs and their differential expression across cell types.