Southern blotting, northern blotting, and western blotting are three cornerstone techniques in molecular biology, each designed to detect specific biomolecules—DNA, RNA, and proteins, respectively. Which means though they share a common workflow rooted in gel electrophoresis and membrane transfer, they diverge fundamentally in target molecules, detection methods, and experimental applications. Understanding these distinctions is essential for researchers selecting the appropriate assay for gene analysis, expression studies, or protein characterization. This article provides a comprehensive comparison of southern vs northern vs western blotting, dissecting their principles, protocols, and practical uses to guide both novice students and seasoned scientists.
Introduction to Blotting Techniques
The term "blotting" originates from the Southern blot, named after Edwin Southern, who published the method in 1975. The technique involves separating nucleic acids or proteins by size using gel
