AQRNA-seq for Quantifying Small RNAs

J Vis Exp. 2024 Feb 2:(204). doi: 10.3791/66335.

Abstract

AQRNA-seq provides a direct linear relationship between sequencing read counts and small RNA copy numbers in a biological sample, thus enabling accurate quantification of the pool of small RNAs. The AQRNA-seq library preparation procedure described here involves the use of custom-designed sequencing linkers and a step for reducing methylation RNA modifications that block reverse transcription processivity, which results in an increased yield of full-length cDNAs. In addition, a detailed implementation of the accompanying bioinformatics pipeline is presented. This demonstration of AQRNA-seq was conducted through a quantitative analysis of the 45 tRNAs in Mycobacterium bovis BCG harvested on 5 selected days across a 20-day time course of nutrient deprivation and 6 days of resuscitation. Ongoing efforts to improve the efficiency and rigor of AQRNA-seq will also be discussed here. This includes exploring methods to obviate gel purification for mitigating primer dimer issues after PCR amplification and to increase the proportion of full-length reads to enable more accurate read mapping. Future enhancements to AQRNA-seq will be focused on facilitating automation and high-throughput implementation of this technology for quantifying all small RNA species in cell and tissue samples from diverse organisms.

Publication types

  • Video-Audio Media

MeSH terms

  • DNA, Complementary / genetics
  • Gene Library
  • High-Throughput Nucleotide Sequencing* / methods
  • RNA* / genetics
  • RNA, Transfer / genetics
  • Sequence Analysis, RNA / methods

Substances

  • RNA
  • RNA, Transfer
  • DNA, Complementary