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Sequencing methods, compositions and systems using terminator nucleotides

  • US 10,544,455 B2
  • Filed: 09/16/2015
  • Issued: 01/28/2020
  • Est. Priority Date: 10/03/2014
  • Status: Active Grant
First Claim
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1. A method for performing nucleotide incorporation, comprising:

  • a) providing a surface including one or more reaction sites, each site operatively linked to an ion-sensitive field effect transistor (ISFET), wherein one or more reaction sites contain a polymerase and a nucleic acid template that has, or is hybridized to, an extendible end;

    b) performing a first nucleotide flow of a first series of nucleotide flows at one or more reaction sites wherein in the first nucleotide flow the one or more reaction sites is contacted with a first solution containing one or more types of terminator nucleotides;

    c) incorporating a first terminator nucleotide at the extendible end contained within one or more reaction sites using the polymerase;

    d) detecting using the ISFET a non-optical signal indicating the nucleotide incorporation of the first terminator nucleotide;

    e) deblocking the first incorporated terminator nucleotide to generate a second extendible end;

    f) performing one or more subsequent nucleotide flows by contacting the one or more reaction sites with subsequent solutions containing one or more types of terminator nucleotides, thereby incorporating terminator nucleotides from the subsequent solutions and synthesizing an extension product which is annealed to the nucleic acid template, and after each subsequent nucleotide flow (i) detecting the presence or absence of a non-optical signal, and (ii) deblocking an incorporated subsequent terminator nucleotide to generate a subsequent extendible end, wherein steps (b)-(f) are conducted in the one or more reaction sites;

    g) identifying contiguous nucleotides in the nucleic acid template contained within the one or more reaction sites using for each template in the one or more reaction sites only the non-optical signals from that reaction site; and

    h) obtaining a first sequencing read from the extension product.

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