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Related Experiment Video

Updated: Jul 15, 2026

Competitive Genomic Screens of Barcoded Yeast Libraries

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Published on: August 11, 2011

Determination of haplotypes from single DNA molecules: a method for single-molecule barcoding.

Ming Xiao¹, Matthew P Gordon, Angie Phong

¹Cardiovascular Research Institute and Center for Human Genetics, University of California, San Francisco, San Francisco, California.

|April 20, 2007

Summary

This study introduces a novel molecular haplotyping method. It directly images DNA molecules to accurately determine genetic haplotypes, overcoming a key challenge in human complex trait studies.

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Area of Science:

Genomics
Molecular Biology
Biotechnology

Background:

Determining haplotypes in diploid individuals is crucial for understanding human complex traits.
Existing methods face technical challenges in accurately resolving genetic variations.

Purpose of the Study:

To develop and demonstrate a novel method for molecular haplotyping.
To enable direct imaging and accurate haplotype inference from individual DNA molecules.

Main Methods:

Employs long-range PCR to amplify DNA fragments.
Utilizes modified gap-filled padlock probe ligation for fluorescent labeling of polymorphic sites.
Applies multicolor total internal reflection fluorescence (TIRF) microscopy to image stretched DNA molecules.

Main Results:

Successfully inferred haplotypes by imaging fluorescent labels on individual DNA molecules.
Demonstrated feasibility using a 9.3-kbp DNA fragment with four single nucleotide polymorphisms (SNPs).
Achieved accurate haplotype determination, akin to reading a barcode, even with incomplete labeling.

Conclusions:

The developed molecular haplotyping method offers a direct and accurate approach for genetic studies.
This technology has the potential to advance research in human complex traits by overcoming haplotyping challenges.