Visualizing the entire DNA from a chromosome in a single frame.

Area of Science:

• Genomics
• Molecular Biology
• Nanotechnology

Background:

• Understanding genome contiguity and phase is crucial for linking genotype to phenotype.
• Long DNA molecule analysis is challenging due to length and complexity.

Purpose of the Study:

• To develop a novel nanochannel system for visualizing megabase-length DNA.
• To enable direct mapping of genomic features like repeat motifs.

Main Methods:

• Fabrication of meandering nanochannels to fold long DNA molecules.
• In situ DNA manipulation including partial denaturation for barcode generation.
• Matching DNA barcodes to reference maps using the Poland-Scheraga model.

Main Results:

• Visualization of a complete 5.7 Mbp Schizosaccharomyces pombe chromosome in a single frame.
• Direct identification and counting of repeat motifs within the DNA.
• Mapping of repeat locations relative to unique barcode motifs.

Conclusions:

• Meandering nanochannels offer a powerful tool for analyzing long DNA sequences.
• This technology facilitates direct visualization of genomic structures and their organization.
• Scalable design holds potential for rapid whole-genome analysis.