Practice question

Western blotting serves as primary analytical tool for evaluating protein expression profile across tissues, developmental stages, or experimental treatments. Proteins extracted in lysis buffer are denatured, resolved by molecular weight, transferred, and immunodetected; band intensity correlates with steady-state abundance reflecting transcriptional, translational, and degradative regulation. Technique also differentiates isoforms, cleavage products, and post-translationally modified species by mobility shift when modification alters mass or charge. Southern analysis examines DNA structure, Northern assesses transcript splicing, and protein-protein interaction mapping requires co-immunoprecipitation, establishing Western blotting as central for expression analysis.