HMN 2025: What is the Innovative super-resolution imaging technique for mild live-cell imaging

Scientists on the Center for Cell Dynamics, School of Biological and Behavioral Sciences, Queen Mary University of London, in collaboration with Carl Zeiss, have developed an modern live-cell imaging approach that mixes an distinctive decision of 60 nanometers with fluorescence restoration after photobleaching, whereas considerably decreasing light-induced mobile harm. This development permits researchers to look at intricate mobile processes with unprecedented readability, opening new avenues for understanding elementary biological mechanisms, together with DNA restore and chromosome dynamics. The expertise may facilitate novel live-cell dynamics primarily based drug goal and drug screening strategies that transcend the diffraction restrict of programs.

The workforce, led by Professor Viji Draviam, has ingeniously mixed Lattice Structured Illumination Microscopy (diSIM/SIM²) with Fluorescence Recovery After Photobleaching (FRAP) to create a novel technique termed FRAP-SR (FRAP in Super-Resolution regime). This approach overcomes the restrictions of conventional microscopy and earlier super-resolution strategies, which regularly endure from phototoxicity, hindering the review of delicate biological occasions in dwelling cells. The findings are published on the bioRxiv preprint server.

“Our FRAP-SR method allows us to visualise buildings as small as 60 nanometers inside dwelling cells—a scale beforehand inaccessible for dynamic research with out inflicting vital mobile stress,” explains Professor Draviam. “This decision, 2000 instances smaller than the width of a human hair, permits us to probe the nanoscale group and conduct of mobile parts in real-time.”

Using FRAP-SR, the researchers investigated the dynamics of 53BP1, a key protein concerned within the restore of double-strand DNA breaks. Their high-resolution live-cell imaging revealed that 53BP1 varieties liquid-like condensates with stunning complexity. Some of those foci appeared as secure, compact buildings, whereas others exhibited extra fluid, dynamic shapes.

By making use of FRAP-SR, the workforce found that the amorphous 53BP1 foci include distinct subcompartments with various protein mobility, suggesting purposeful specialization inside these restore facilities. In distinction, compact foci displayed uniform restoration after photobleaching however confirmed higher heterogeneity in restoration charges between totally different foci. The study additionally revealed that the dynamics of those foci are influenced by mobile circumstances, corresponding to restoration from DNA replication stress.

Professor Draviam highlights the potential of this innovation: “FRAP-SR supplies a strong instrument to dissect the dynamic structure of protein assemblies on the nanoscale in dwelling cells. It permits us to analyze elementary mobile processes, notably these delicate to gentle publicity, with unprecedented element and minimal perturbation. This will rework the sector of optogenetics within the super-resolution regime. It may also allow the event of recent anti-cancer medication that concentrate on DNA harm restore pathways which might be dynamic”

This development holds vital promise for cell biology researchers finding out a variety of light-sensitive processes, together with DNA harm response, chromosome group, mitochondrial dynamics, and mobile senescence. The potential to check these processes at high decision in dwelling cells with out inducing harm will undoubtedly speed up discoveries in these fields.

The world DNA restore medication market was valued at roughly USD 9.18 billion in 2024 and is projected to achieve USD 13.97 billion by 2030, rising at a compound annual development charge (CAGR) of round 7.2%. The workforce has proven how the DNA harm marker 53BP1 could be exploited in live-cells utilizing FRAP-SR to speed up the event of novel DNA restore medication or drug candidates related to customized medication.

The ZEISS Elyra 7 system, enhanced with FRAP capabilities from Rapp OptoElectronics, was instrumental on this study, offering the superior super-resolution imaging essential to resolve the subcompartments of 53BP1 foci for the primary time. Professor Draviam’s collaboration with Zeiss and Rapp OptoElectronics to combine FRAP and structured illumination microscopy allowed for exact quantification of protein dynamics.