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Evaluation and application of the strand-specific protocol for next-generation sequencing.

Kuo-Wang Tsai1, Bill Chang2, Cheng-Tsung Pan3

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Summary

Strand-specific (SS) protocols provide more accurate gene expression estimates than non-strand-specific (NSS) methods in next-generation sequencing (NGS). SS protocols also enable the discovery of novel antisense genes.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Bioinformatics

Background:

  • Next-generation sequencing (NGS) is a vital tool in biological research.
  • Traditional non-strand-specific (NSS) protocols can lead to biased gene expression quantification, especially for overlapping transcripts.
  • Strand-specific (SS) protocols have emerged to address these limitations.

Purpose of the Study:

  • To compare the accuracy of SS and NSS protocols for gene expression analysis using next-generation sequencing (NGS).
  • To evaluate the capability of SS protocols in identifying novel antisense transcripts.
  • To validate the utility of SS protocols in comprehensive genomic studies.

Main Methods:

  • Comparative analysis of RNA samples prepared using SS and NSS protocols.
  • Gene expression quantification via Illumina HiSeq platform and real-time quantitative PCR (RT-qPCR).
  • Bioinformatic analysis including sequence assembly and PCR validation for novel gene identification.

Main Results:

  • SS protocols demonstrated higher precision in gene expression estimation compared to NSS protocols, particularly for antisense-overlapped transcripts.
  • Sequence reads generated by SS protocols were comparable to those from NSS protocols in various aspects.
  • Novel antisense genes were successfully identified and characterized using SS protocols, sequence assembly, and PCR validation.

Conclusions:

  • Strand-specific (SS) protocols offer superior accuracy for gene expression profiling in next-generation sequencing (NGS) compared to traditional non-strand-specific (NSS) methods.
  • SS protocols are effective in discovering previously unannotated antisense genes.
  • The adoption of SS protocols is recommended for future transcriptomic studies requiring precise gene expression quantification and novel gene discovery.