Identifying and correcting an allelic ladder signal for DNA analysis
First Claim
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1. A method for determining an allelic ladder signal for DNA analysis, comprising:
- receiving a measured allelic ladder signal for an allelic ladder substance, which includes a plurality of fragments, wherein the measured allelic ladder signal is an electrical signal;
obtaining, from a memory device, a reference set of expected fragment sizes of fragments of the ladder substance;
comparing, with a processor, each fragment size of a peak of the measured allelic ladder signal with each of the expected fragment sizes to generate an electrical signal indicating of an absolute value of a difference between each of the fragment sizes of each of the peaks of the measured allelic ladder signal and each of the expected fragment sizes;
determining, with the processor and for each of the fragment sizes of the peaks of the allelic ladder signal, whether a fragment size of a peak of the peaks of the measured allelic ladder signal is within a predetermined fragment size range of each of the expected fragment sizes from the electrical signal indicating the absolute value;
identifying, with the processor and for each peak with a fragment size within the predetermined fragment size range of an expected fragment size, an expected fragment size closest to the fragment size of the peak from the electrical signal indicating the absolute value;
determining, with the processor, peaks with identified expected fragment sizes closest to the fragment sizes of the peaks as true peaks and all other peaks as false peaks; and
generating, with the processor, the allelic ladder signal for DNA analysis with the true peaks and not the false peaks, wherein the allelic ladder signal for DNA analysis is an electrical signal.
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Abstract
A method for determining an allelic ladder signal for DNA analysis includes obtaining a measured allelic ladder signal for an allelic ladder substance, which includes a plurality of fragments, obtaining a reference set of expected fragment sizes of fragments of the ladder substance, and generating a signal identifying whether a peak for a fragment size of the measured ladder signal is a true peak of the ladder substance based on the reference set of expected fragment sizes, wherein the allelic ladder signal for DNA analysis includes the true peaks identified in the signal.
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Citations
17 Claims
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1. A method for determining an allelic ladder signal for DNA analysis, comprising:
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receiving a measured allelic ladder signal for an allelic ladder substance, which includes a plurality of fragments, wherein the measured allelic ladder signal is an electrical signal; obtaining, from a memory device, a reference set of expected fragment sizes of fragments of the ladder substance; comparing, with a processor, each fragment size of a peak of the measured allelic ladder signal with each of the expected fragment sizes to generate an electrical signal indicating of an absolute value of a difference between each of the fragment sizes of each of the peaks of the measured allelic ladder signal and each of the expected fragment sizes; determining, with the processor and for each of the fragment sizes of the peaks of the allelic ladder signal, whether a fragment size of a peak of the peaks of the measured allelic ladder signal is within a predetermined fragment size range of each of the expected fragment sizes from the electrical signal indicating the absolute value; identifying, with the processor and for each peak with a fragment size within the predetermined fragment size range of an expected fragment size, an expected fragment size closest to the fragment size of the peak from the electrical signal indicating the absolute value; determining, with the processor, peaks with identified expected fragment sizes closest to the fragment sizes of the peaks as true peaks and all other peaks as false peaks; and generating, with the processor, the allelic ladder signal for DNA analysis with the true peaks and not the false peaks, wherein the allelic ladder signal for DNA analysis is an electrical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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receiving, from an optical channel of an optical detector of an optical reader, a measured allelic ladder signal for an allelic ladder substance, which includes a plurality of fragments; retrieving from a memory device a reference set of expected fragment sizes of fragments of the allelic ladder substance; comparing, with a processor, each of the expected fragment sizes with each fragment sizes of each peak of the measured allelic ladder signal; determining, with the processor, for a peak of the measured allelic ladder signal absolute values between a fragment size of each peak and each of the expected fragment sizes; identifying, with the processor, and for the fragment, a first expected fragment size corresponding to a smallest deviation of the deviations for a peak; comparing, with the processor, the smallest absolute value for each peak with a first predetermined threshold corresponding to the first expected fragment size; identifying, with the processor, a peak as a true peak in response to the smallest absolute value for a peak satisfying the first predetermined threshold corresponding to the first expected fragment size; identifying, with the processor, for each peak, a second expected fragment size corresponding to a second absolute value for each peak; comparing, with the processor, the second absolute value for the each peak with a second predetermined threshold corresponding to the second expected fragment size; identifying, with the processor and for a peak as a false peak in response to the second absolute value for a peak failing to satisfy the second predetermined threshold corresponding the second expected fragment size; and correcting the measured allelic ladder signal for DNA analysis by removing the false peak from the measured allelic ladder signal, which results in a corrected allelic ladder signal that includes only true peaks. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification