Why are the RT² qPCR Primer Assays not designed to cross exon-intron junctions or boundaries?

The RT² qPCR Primer Assays are not designed to cross exon-intron junctions or boundaries because for SYBR Green-based qPCR detection, the most important parameter for primer design is the generation of only a single gene-specific amplicon with high amplification efficiency, without the production of primer-dimers. Primer assays amplifying short products contained within a single exon meet this parameter most optimally. Primers that cross exon-intron junctions may still detect processed pseudogenes, heteronuclear RNA (hnRNA), as well as unannotated alternative transcripts and splice variants, thus complicating SYBR Green-based qPCR detection.

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