Complex shapes self-assembled from single-stranded DNA tiles.

Area of Science:

• Nanotechnology
• Synthetic Biology
• Biochemistry

Background:

• Programmed self-assembly of nucleic acids, particularly DNA origami, effectively creates complex nanostructures.
• Modular strategies using DNA or RNA tiles assemble into various periodic and algorithmic structures.
• Creating complex, finite shapes from numerous uniquely addressable tiles remains a significant challenge.

Purpose of the Study:

• To develop a simpler, more versatile method for assembling complex finite nanostructures using DNA.
• To overcome the limitations of existing modular strategies in creating intricate shapes from many distinct tiles.

Main Methods:

• Introduced a single-stranded tile (SST) composed of a 42-base DNA strand with concatenated sticky ends.
• Utilized a self-assembled rectangular "molecular canvas" where each SST acts as a "pixel" binding to four neighbors.
• Employed a one-pot annealing process with specific strand subsets to define and assemble target shapes.

Main Results:

• Successfully assembled complex two-dimensional shapes and tubes using hundreds to over a thousand distinct SSTs.
• Demonstrated the creation of 107 distinct complex 2D shapes from a 310-pixel canvas using subsets of SSTs.
• Validated the SST approach as a simple, modular, and robust framework for designing nanostructures.

Conclusions:

• Single-stranded tile (SST) assembly provides a powerful and accessible method for constructing complex nanostructures with precise shapes.
• This framework simplifies the design and fabrication of intricate nanoscale objects from short synthetic DNA strands.
• The SST approach significantly advances the field of programmable nucleic acid self-assembly for diverse applications.