Systems and methods to detect rare mutations and copy number variation
First Claim
1. A method for detecting copy number variation, comprising:
- a) attaching a set of molecular barcodes to cell-free nucleic acid molecules obtained or derived from a sample of a subject to produce tagged parent polynucleotides, wherein a plurality of the tagged parent polynucleotides has identical molecular barcodes;
b) amplifying the plurality of the tagged parent polynucleotides, thereby producing progeny polynucleotides;
c) sequencing at least a portion of the progeny polynucleotides to generate sequence reads;
d) mapping the sequence reads derived from the sequencing to a reference sequence to produce mapped reads;
e) grouping the mapped sequence reads into families, wherein, of the families, a family corresponds to sequence reads of one or more progeny polynucleotides amplified from a same tagged parent polynucleotide of the plurality of the tagged parent polynucleotides;
f) quantifying numbers of families mapping to predefined regions of the reference sequence; and
g) determining copy number variation in one or more of the predefined regions from the numbers of families mapping to the predefined regions of the reference sequence.
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Abstract
The present disclosure provides a system and method for the detection of rare mutations and copy number variations in cell free polynucleotides. Generally, the systems and methods comprise sample preparation, or the extraction and isolation of cell free polynucleotide sequences from a bodily fluid; subsequent sequencing of cell free polynucleotides by techniques known in the art; and application of bioinformatics tools to detect rare mutations and copy number variations as compared to a reference. The systems and methods also may contain a database or collection of different rare mutations or copy number variation profiles of different diseases, to be used as additional references in aiding detection of rare mutations, copy number variation profiling or general genetic profiling of a disease.
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Citations
26 Claims
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1. A method for detecting copy number variation, comprising:
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a) attaching a set of molecular barcodes to cell-free nucleic acid molecules obtained or derived from a sample of a subject to produce tagged parent polynucleotides, wherein a plurality of the tagged parent polynucleotides has identical molecular barcodes; b) amplifying the plurality of the tagged parent polynucleotides, thereby producing progeny polynucleotides; c) sequencing at least a portion of the progeny polynucleotides to generate sequence reads; d) mapping the sequence reads derived from the sequencing to a reference sequence to produce mapped reads; e) grouping the mapped sequence reads into families, wherein, of the families, a family corresponds to sequence reads of one or more progeny polynucleotides amplified from a same tagged parent polynucleotide of the plurality of the tagged parent polynucleotides; f) quantifying numbers of families mapping to predefined regions of the reference sequence; and g) determining copy number variation in one or more of the predefined regions from the numbers of families mapping to the predefined regions of the reference sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification