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NASBA is an isothermal nucleic acid amplification reaction that amplifies mRNA in a dsDNA background. Although similar to the sensitive reverse transcription/polymerase chain reaction (RT-PCR) in mRNA detection, NASBA is not prone to give false positive results caused by genomic dsDNA. Therefore, NASBA is unique for sensitive detection of transcription of intronless genes, which preclude strategies such as intron spanning primer pairs to control false positive results in RT-PCR. Using NASBA, mRNA of the intronless human interferon-beta gene was demonstrated with a sensitivity of 10 copies, whereas 100 ng genomic DNA gave a negative result.

nucleic acids research

Highly sensitive detection of gene expression of an intronless gene: amplification of mRNA, but not genomic DNA by nucleic acid sequence based amplification (NASBA)