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A major focus of ongoing research in the Biophysics Group involves molecular microscopy. Central to this effort is the vision that future microscopy advancements will rely on innovative protein and nucleic acid-based optical probes instead of traditional organic compounds. Visualizing how natural macromolecules localize within cells has proven essential for deciphering their biological roles. The current challenge lies in unraveling how these molecules form functional complexes and tracking their real-time activities within living organisms through microscopy, enabling researchers to map these processes spatially.
Fluorescent tracer dyes have transformed cellular signaling studies by enabling continuous monitoring of physiological processes in individual cells and cell groups with exceptional temporal and spatial precision. However, these synthetic dyes face limitations since they require chemical synthesis and must be delivered via hydrolyzable esters or microinjection, resulting in either widespread tissue distribution or selective labeling of just a few cells. Without targeted delivery to specific cell types, meaningful optical data often gets obscured by background noise from inactive cells or signals from irrelevant cells. Additionally, organic dyes cannot detect localized protein interactions since they disperse throughout the cytoplasm.