METHODS FOR MAINTAINING THE INTEGRITY AND IDENTIFICATION OF A NUCLEIC ACID TEMPLATE IN A MULTIPLEX SEQUENCING REACTION
The invention generally relates to methods for maintaining the integrity and identification of a nucleic acid template in a multiplex sequencing reaction. In certain embodiments, methods of the invention involve obtaining a solution including a template nucleic acid, introducing an identifier nucleic acid to the solution, incorporating the same barcode sequence into the template and the identifier nucleic acids, and sequencing the template and the identifier nucleic acids.
1 . A method for validating the integrity of a nucleic acid template in a multiplex sequencing reaction, the method comprising:
obtaining a solution comprising a template nucleic acid;
introducing an identifier nucleic acid to the solution;
incorporating an identical barcode oligonucleotide into the template and the identifier nucleic acids; and
sequencing the template and the identifier nucleic acids.
2 . The method according to claim 1 , wherein prior to sequencing, the template and the identifier are attached to a substrate.
3 . The method according to claim 2 , wherein the template and the identifier are directly attached to the substrate.
4 . The method according to claim 2 , wherein the template and the identifier are indirectly attached to the substrate.
5 . The method according to claim 1 , further comprising, amplifying the template and the identifier.
6 . The method according to claim 1 , wherein sequencing is sequencing by synthesis.
7 . The method according to claim 6 , wherein the sequencing by synthesis is single molecule sequencing by synthesis.
8 . The method according to claim 1 , wherein sequencing comprises:
hybridizing a primer to both the template and the identifier to form a template/primer duplex and an identifier/primer duplex;
contacting both duplexes with a polymerase enzyme in the presence of at least one detectably labeled nucleotide under conditions that permit the polymerase to add nucleotides to the primers of both duplexes in a template-dependent manner;
detecting a signal from the incorporated labeled nucleotide; and
sequentially repeating the contacting and detecting steps at least once, wherein sequential detection of incorporated labeled nucleotide determines the sequence of the template nucleic acid and the identifier nucleic acid.
9 . The method according to claim 8 , wherein the detectably labeled nucleotide is an optically labeled nucleotide.
10 . The method according to claim 9 , wherein the optically labeled nucleotide is a fluorescently labeled nucleotide.
11 . A method for quantifying a contamination rate in a sequencing reaction, the method comprising:
determining a number of barcode reads in a sequencing reaction that are correctly correlated with an identifier nucleic acid, wherein the identifier nucleic acid is associated with a template nucleic acid, and the barcode reads are generated by a sequencing apparatus;
determining a number of barcode reads in the sequencing reaction that are incorrectly correlated with the identifier nucleic acid; and
obtaining a fraction of the two numbers, thereby quantifying a contamination rate in the sequencing reaction.
12 . The method according to claim 11 , wherein determining comprises:
introducing an identifier nucleic acid to a solution comprising a template nucleic acid;
incorporating an identical barcode oligonucleotide into the template and the identifier nucleic acids; and
sequencing the template and the identifier nucleic acids.
13 . The method according to claim 12 , wherein prior to sequencing, the template and the identifier are attached to a substrate.
14 . The method according to claim 13 , wherein the template and the identifier are directly attached to the substrate.
15 . The method according to claim 13 , wherein the template and the identifier are indirectly attached to the substrate.
16 . The method according to claim 12 , further comprising, amplifying the template and the identifier.
17 . The method according to claim 12 , wherein sequencing is sequencing by synthesis.
18 . The method according to claim 17 , wherein the sequencing by synthesis is single molecule sequencing by synthesis.
19 . The method according to claim 12 , wherein sequencing comprises:
hybridizing a primer to both the template and the identifier to form a template/primer duplex and an identifier/primer duplex;
contacting both duplexes with a polymerase enzyme in the presence of at least one detectably labeled nucleotide under conditions that permit the polymerase to add nucleotides to the primers of both duplexes in a template-dependent manner;
detecting a signal from the incorporated labeled nucleotide; and
sequentially repeating the contacting and detecting steps at least once, wherein sequential detection of incorporated labeled nucleotide determines the sequence of the template nucleic acid and the identifier nucleic acid.
20 . The method according to claim 19 , wherein the detectably labeled nucleotide is an optically labeled nucleotide.
21 . The method according to claim 20 , wherein the optically labeled nucleotide is a fluorescently labeled nucleotide.
22 . A method for identifying a contamination in a batch of barcode oligonucleotides, the method comprising:
preparing a plurality of batches of barcoded identifier nucleic acids, wherein each batch comprises a unique identifier nucleic acid attached to a unique barcode oligonucleotide;
pooling the batches;
sequencing the pooled batches; and
identifying barcode oligonucleotides that are improperly paired with identifier nucleic acids.
23 . The method according to claim 22 , wherein attaching comprises a PCR reaction.
24 . The method according to claim 22 , wherein attaching comprises a ligation reaction.
25 . The method according to claim 22 , wherein prior to sequencing, the barcoded identifier is attached to a substrate.
26 . The method according to claim 25 , wherein the barcoded identifier is directly attached to the substrate.
27 . The method according to claim 25 , wherein the barcoded identifier is indirectly attached to the substrate.
28 . The method according to claim 22 , further comprising, amplifying the barcoded identifier.
29 . The method according to claim 22 , wherein sequencing is sequencing by synthesis.
30 . The method according to claim 29 , wherein the sequencing by synthesis is single molecule sequencing by synthesis.
31 . The method according to claim 22 , wherein sequencing comprises:
hybridizing a primer to the barcoded identifier to form an identifier/primer duplex;
contacting the duplex with a polymerase enzyme in the presence of at least one detectably labeled nucleotide under conditions that permit the polymerase to add nucleotides to the primer in a template-dependent manner;
detecting a signal from the incorporated labeled nucleotide; and
sequentially repeating the contacting and detecting steps at least once, wherein sequential detection of incorporated labeled nucleotide determines the sequence of the barcoded identifier nucleic acid.
32 . The method according to claim 31 , wherein the detectably labeled nucleotide is an optically labeled nucleotide.
33 . The method according to claim 32 , wherein the optically labeled nucleotide is a fluorescently labeled nucleotide.