Efficient and specific oligo-based depletion of rRNA

Area of Science:

• Molecular Biology
• Genomics
• Biochemistry

Background:

• Ribosomal RNA (rRNA) constitutes over 85% of total RNA in most organisms, complicating RNA sequencing (RNA-seq) analysis.
• Standard RNA-seq protocols often involve polyadenylated transcript enrichment or rRNA depletion to focus on informative transcripts.
• Existing rRNA depletion kits have limitations due to their reliance on conserved rRNA sequences, restricting their use across diverse species.

Purpose of the Study:

• To develop a versatile and efficient method for targeted ribosomal RNA (rRNA) depletion.
• To enable RNA sequencing analysis in organisms where commercial rRNA depletion kits are ineffective or unavailable.
• To provide an alternative strategy for removing abundant RNA species, particularly for non-polyadenylated transcripts.

Main Methods:

• Utilized biotinylated oligonucleotide probes designed to hybridize with target rRNA sequences.
• Employed streptavidin-coated paramagnetic beads for capturing the biotinylated probe-rRNA complexes.
• Optimized probe sequences and experimental conditions for efficient rRNA removal.

Main Results:

• Achieved efficient and specific depletion of trypanosomal rRNA, reducing its abundance to less than 5%.
• Demonstrated minimal off-target effects on other RNA transcripts.
• Validated the adaptability of the method for depleting various abundant transcripts across different species by modifying probe sequences.

Conclusions:

• The developed protocol offers a robust and adaptable alternative for rRNA depletion, especially for organisms with unique rRNA sequences or when polyadenylated transcript enrichment is not feasible.
• This method enhances the utility of RNA sequencing for studying a broader range of RNA molecules, including non-coding RNAs and degraded samples.
• The approach is species-independent, offering a valuable tool for researchers worldwide.