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Measurement of protein expression using reagents with barcoded oligonucleotide sequences

  • US 10,338,066 B2
  • Filed: 05/30/2018
  • Issued: 07/02/2019
  • Est. Priority Date: 09/26/2016
  • Status: Active Grant
First Claim
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1. A method of measuring protein expression in cells, comprising:

  • (a) contacting a plurality of oligonucleotide-conjugated antibodies with a plurality of cells comprising a plurality of protein targets, wherein each of the plurality of oligonucleotide-conjugated antibodies comprises an antibody conjugated with an antibody specific oligonucleotide comprising a unique identifier for the antibody conjugated therewith and a poly(A) tail, and wherein the antibody is capable of specifically binding to at least one of the plurality of protein targets;

    (b) partitioning the plurality of cells associated with the plurality of oligonucleotide-conjugated antibodies to a plurality of partitions, wherein a partition of the plurality of partitions comprises a single cell from the plurality of cells associated with the oligonucleotide-conjugated antibodies;

    (c) in the partition comprising the single cell, contacting a barcoding particle with the antibody specific oligonucleotides, wherein the barcoding particle comprises a plurality of oligonucleotide probes each comprising a poly(T) region and a barcode sequence selected from a diverse set of unique barcode sequences;

    (d) extending the oligonucleotide probes hybridized to the antibody specific oligonucleotides via the hybridization between the poly(A) tails of the antibody specific oligonucleotides and the poly(T) regions of the oligonucleotide probes to produce a plurality of labeled nucleic acids, wherein each of the labeled nucleic acid comprises a unique identifier, or a complementary sequence thereof, and a barcode sequence; and

    (e) obtaining sequence information of the plurality of labeled nucleic acids or a portion thereof to determine the quantity of one or more of the plurality of protein targets in one or more of the plurality of cells.

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