Novel isothermal, linear nucleic acid amplification systems for highly multiplexed applications.

Area of Science:

• Molecular Biology
• Genomics
• Transcriptomics

Background:

• Advancements in large-scale genomic, transcriptomic, and proteomic analysis rely on high-throughput tools.
• A novel nucleic acid amplification system is introduced, utilizing multiple generation methods.
• 3'-Ribo-SPIA primes cDNA synthesis at the 3' polyA tail, while whole transcript (WT)-Ribo-SPIA enables full-length transcript amplification, independent of the polyA tail.

Purpose of the Study:

• To develop isothermal linear nucleic acid amplification systems for DNA (SPIA) and RNA (Ribo-SPIA).
• To enable whole-transcriptome amplification from minimal RNA samples (as little as 1 ng total RNA).
• To validate the accuracy and reproducibility of the amplification methods for gene expression profiling.

Main Methods:

• Development of isothermal linear amplification systems using a single chimeric primer for SPIA and Ribo-SPIA.
• Assessment of amplification efficiency via delta threshold cycle analysis.
• Quantification and quality assessment of RNA and amplified cDNA products using GeneChip array profiling and real-time PCR.

Main Results:

• Ribo-SPIA-based RNA amplification demonstrated linearity across six orders of magnitude of transcript abundance.
• Microgram quantities of amplified cDNA were generated from as little as 1 ng of total RNA.
• WT-Ribo-SPIA provided equal representation of transcripts throughout their length.

Conclusions:

• The developed methods facilitate comprehensive gene expression profiling from limited biological samples.
• WT-Ribo-SPIA is suitable for amplifying non-polyA-tailed RNA, enabling analysis in both eukaryotic and prokaryotic organisms.
• These novel amplification techniques enhance the scope of transcriptomic analysis.