DOI: 10.1101/471219Nov 19, 2018Paper

DNA microscopy: Optics-free spatio-genetic imaging by a stand-alone chemical reaction

BioRxiv : the Preprint Server for Biology
Joshua A. WeinsteinFeng Zhang

Abstract

Analyzing the spatial organization of molecules in cells and tissues is a cornerstone of biological research and clinical practice. However, despite enormous progress in profiling the molecular constituents of cells, spatially mapping these constituents remains a disjointed and machinery-intensive process, relying on either light microscopy or direct physical registration and capture. Here, we demonstrate DNA microscopy, a new imaging modality for scalable, optics-free mapping of relative biomolecule positions. In DNA microscopy of transcripts, transcript molecules are tagged in situ with randomized nucleotides, labeling each molecule uniquely. A second in situ reaction then amplifies the tagged molecules, concatenates the resulting copies, and adds new randomized nucleotides to uniquely label each concatenation event. An algorithm decodes molecular proximities from these concatenated sequences, and infers physical images of the original transcripts at cellular resolution. Because its imaging power derives entirely from diffusive molecular dynamics, DNA microscopy constitutes a chemically encoded microscopy system.

Related Concepts

Diagnostic Imaging
Microscopy
Nucleotides
Randomization
Research
Chemicals
Light Microscopy
In Situ
Physiologic Resolution
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