The pulse-chase technique is a research method for tracking the temporal and spatial fate of a molecule within a cell by briefly labeling newly synthesized molecules with a radioactive precursor (the pulse), then flooding the system with a non-radioactive form of the same precursor (the chase) so that no further labeled molecules are made and existing labeled molecules can be followed as a synchronized cohort over time. This technique established the core principle of the secretory pathway: proteins destined for secretion are synthesized in the rough endoplasmic reticulum and move sequentially through the Golgi apparatus and secretory vesicles before release at the plasma membrane. This is cell biology theory concerning experimental methodology and organelle-based protein trafficking, and it underlies the broader discipline's understanding of compartmentalized, directional intracellular transport.
The pulse-chase technique is a research method for tracking the temporal and spatial fate of a molecule within a cell by briefly labeling newly synthesized molecules with a radioactive precursor (the…