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DNA integrity assay (DIA) for cancer diagnostics, using confocal fluorescence spectroscopy

  • US 8,835,110 B2
  • Filed: 11/04/2009
  • Issued: 09/16/2014
  • Est. Priority Date: 11/04/2008
  • Status: Active Grant
First Claim
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1. A method for determining the size distribution of cell-free DNA molecules in a sample, comprisinglabeling the cell-free DNA molecules in the sample with a fluorescent dye in a stoichiometric manner,subjecting the labeled DNA to single molecule spectroscopy, andmeasuring fluorescent burst parameters and fluorescent burst rate of the labeled DNA,wherein the fluorescent burst parameters, which comprise burst size, burst height and/or transit time, indicate the length of each of the DNA molecules;

  • and the fluorescent burst rate indicates the abundance of each size of DNA molecule, andconducting single molecule DNA integrity analysis (smDIA) of the labeled DNA molecules in the sample, thereby determining the size distribution of the cell-free DNA molecules.

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