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 template nucleic acid, incorporating a pair of sequence identifiers into the template, and sequencing the template.
1. A method for reducing template cross-over error introduced during sequencing workflow, the method comprising the steps of
incorporating at least two members of a plurality of identifier sequences into template nucleic acids obtained from at least two different samples, wherein said two members constitute a distinct pair associated with said template;
combining said nucleic acid templates into a single sample;
amplifying said nucleic acid templates on a surface of a flow cell thereby to form clusters, at least one of which comprises a chimeric sequence comprising a combination of identifier sequences that are different than any of said distinct pairs;
sequencing amplicons obtained in said amplifying step; and
discarding sequence reads obtained in said sequencing step that contain said combination of identifier sequences that are different than any of said distinct pairs, thereby to reduce cross-over error.
2. The method of claim 1 , wherein the identifier sequences are nucleic acid sequence tags.
3. The method of claim 1 , wherein the identifiers are first and second barcode sequences.
4. The method of claim 1 , wherein a first identifier sequence is incorporated into a 5′ portion of the template, and a second identifier sequence is incorporated into a 3′ portion of the template.
5. The method of claim 4 , wherein after incorporation of the identifier sequences, the template has the following configuration from 5′ to 3′: a first known sequence; a first barcode sequence; a second known sequence; a target polynucleotide sequence; a third known sequence; a second barcode sequence; and a fourth known sequence.
6. The method of claim 1 , wherein a first identifier sequence is incorporated into a 5′ end of the template, and a second identifier sequence is incorporated into a 3′ end of the template.
7. The method of claim 1 , wherein prior to said sequencing step, the template is attached to a substrate.
8. The method of claim 7 , wherein the template is directly attached to the substrate.