Northern blot detects a defined RNA species by separating denatured RNA by size, transferring RNA to a membrane, hybridizing with a complementary labeled DNA or RNA probe, and detecting probe-bound RNA by autoradiography, phosphorimaging, or validated nonradioactive detection. The readout is both RNA size and abundance: band migration estimates transcript length or RNA-processing state, while band intensity reflects relative target RNA amount after normalization to total RNA, rRNA, or another validated loading control. In cancer cells, primary neurons, mouse tumor samples, intestinal organoids, inflammatory macrophages, or drug-screening studies, Northern blot is most appropriate when transcript size, isoform pattern, RNA processing, or small-RNA detection is important; qPCR or RNA-seq can complement it when higher sensitivity or global profiling is needed.
Northern Blot
Northern Blot is a molecular biology technique used to detect and analyze RNA. The method includes RNA electrophoresis, transfer to membrane, RNA immobilization, RNA probe hybridization and detection. It is commonly used to measure the mRNA levels of specific genes, study gene expression regulation, and the size and structure of RNA. Although Northern Blot provides useful information in RNA analysis, it has been replaced by more advanced technologies such as RT-PCR and RNA sequencing in recent years due to its tedious operation and relatively low sensitivity.
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