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DNA-PAINT

The Wyss Institute for Biologically Inspired Engineering at Harvard University today announced the launch of its latest startup company, Ultivue Inc. Ultivue will introduce imaging reagents providing super-resolution capabilities on standard single-molecule microscopes similar to those of expensive specialized instruments. The announcement follows a worldwide licensing agreement between Harvard's Office of Technology Development (OTD) and Ultivue for the Wyss Institute's DNA-PAINT and Exchange-PAINT technologies, a highly versatile and inexpensive microscopic imaging platform designed to visualize objects with molecular-scale resolution and unprecedented complexity.

Molecular objects that are closer together than 200 nm cannot be distinguished from each other in standard-resolution fluorescent microscopic images and instead appear as single blurry spots. Super-resolution microscopes have been developed to overcome this optical barrier, but their high cost can be prohibitive, and they often rely on specialized conditions and fluorescent dyes that can be turned on and off with the help of a laser. DNA-PAINT on the other hand, can be performed on standard fluorescent microscopes using low-cost DNA-PAINT reagents, and yet surpass the resolving power of current super-resolution microscopes.

To accomplish this, DNA-PAINT leverages the physical properties of the genetic material, DNA. The key principle is based on the tunable association of two short complementary DNA strands ¾ one is attached to the object to be visualized and the other to a fluorescent dye. By carefully designing the nucleotide sequence of the complementary DNA strands, the time the two DNA strands remain bound before being separated again can be precisely programmed. This transient DNA interaction typically results in 'blinking' of the fluorescent dye with targets being localized by the dye with much higher precision than would be possible by other means. By using different DNA sequences to label distinct targets, and applying the imager strands one target at a time, many distinct targets can be imaged sequentially using only one dye and one laser source. This so-called Exchange-PAINT variation lends itself to multiplexing that can visualize 10 and potentially up to 100 different molecular species. 

Supported by an NIH Transformative Research Award, an NIH Director's New Innovator Award, an NIH BRAIN Initiative Award, an NSF Expedition in Computing Award, an NSF Faculty CAREER Award, grants from ONR, and the Wyss Institute's translational funding, Yin and his co-workers increased the resolution of the initial DNA-PAINT technology and added key capabilities to their platform including multiplexing and compatibility with antibodies, which are broadly used target-specific reagents. The team also engaged with academic partners to successfully test and de-risk a beta version of the future reagent kit on various biological samples.

Ultivue will use super-resolution DNA-PAINT and Exchange-PAINT as its defining technologies to develop and expand a portfolio of multiplexed super-resolution-enabling and enhancing products. Beside Yin, Ultivue's co-founders also include Ralf Jungmann, a former postdoctoral fellow in Yin's Wyss Institute lab, who co-developed the technologies and now is a Group Leader at the Max Planck Institute of Biochemistry and the Ludwig Maximilian University in Munich, Germany. Additionally, Yin's former postdoctoral fellows at the Wyss Institute, Xi Chen and Mael Manesse, will be joining the company as Staff Scientists, contributing further expertise to Ultivue's product development efforts.

Image Caption: DNA-PAINT and Exchange-PAINT technologes (right image) dramatically improve the limited resolution abilities of single-molecule microscopes (left image). Shown are structures of thin microtubule fibers (green) that build a skeleton within cells ...

Labels: Wyss Institute,Ultivue Inc.,biologically inspired engineering,biophotonics,microscopy

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