Single cell secretome analysis
Systems, methods, compositions, and kits for measuring secreted factors from cells are disclosed herein, including those capable of determining single cell secretion activity and protein expression and/or gene expression simultaneously. Disclosed herein include solid supports comprising a plurality of capture probes capable of specifically binding to at least one of the plurality of secreted factors secreted by a single cell. Also disclosed herein include secreted factor-binding reagents capable of specifically binding to a secreted factor bound by a capture probe. A secreted factor-binding reagent can comprise a secreted factor-binding reagent specific oligonucleotide comprising a unique factor identifier sequence for the secreted factor-binding reagent.
1. A method for measuring the number of copies of a secreted factor secreted by one or more single cells, comprising:
contacting one or more single cells with a first plurality of capturing synthetic particles, wherein the one or more single cells are capable of secreting a plurality of secreted factors, wherein each capturing synthetic particle comprises a plurality of capture probes capable of specifically binding to at least one of the plurality of secreted factors secreted by a single cell,
wherein contacting one or more single cells with a first plurality of capturing synthetic particles comprises partitioning the one or more single cells and the first plurality of capturing synthetic particles to a plurality of first partitions, wherein a first partition of the plurality of first partitions comprises a single cell of the one or more single cells and a single capturing synthetic particle of the first plurality of capturing synthetic particles;
pooling the single capturing synthetic particles from each first partition of the plurality of first partitions to generate a second plurality of capturing synthetic particles;
contacting the second plurality of capturing synthetic particles with a plurality of secreted factor-binding reagents each capable of specifically binding to a secreted factor bound by a capture probe, wherein each of the plurality of secreted factor-binding reagents comprises a secreted factor-binding reagent specific oligonucleotide comprising a unique factor identifier sequence for the secreted factor-binding reagent;
hybridizing a plurality of oligonucleotide barcodes with the secreted factor-binding reagent specific oligonucleotides, wherein the oligonucleotide barcodes each comprise a first molecular label;
extending the plurality of oligonucleotide barcodes hybridized to the secreted factor-binding reagent specific oligonucleotides to generate a plurality of barcoded secreted factor-binding reagent specific oligonucleotides each comprising a sequence complementary to the unique factor identifier sequence and the first molecular label; and
obtaining sequencing data of the plurality of barcoded secreted factor-binding reagent specific oligonucleotides to determine the number of copies of the at least one secreted factor secreted by at least one of the one or more single cells.
2. The method of claim 1 , comprising, after contacting the second plurality of capturing synthetic particles with the plurality of secreted factor-binding reagents, removing one or more secreted factor-binding reagents of the plurality of secreted factor-binding reagents that are not bound with the second plurality of capturing synthetic particles to generate a third plurality of capturing synthetic particles, wherein removing the one or more secreted factor-binding reagents not bound with the second plurality of capturing synthetic particles comprises: removing the one or more secreted factor-binding reagents not bound with the respective at least one of the secreted factor bound by a capture probe.
3. The method of claim 2 , wherein hybridizing a plurality of oligonucleotide barcodes with the secreted factor-binding reagent specific oligonucleotides comprises:
partitioning the third plurality of capturing synthetic particles to a plurality of second partitions, wherein a second partition of the plurality of second partitions comprises a single capturing synthetic particle from the third plurality of capturing synthetic particles; and
in the second partition comprising the single capturing synthetic particle, hybridizing a plurality of oligonucleotide barcodes with the secreted factor-binding reagent specific oligonucleotides.
4. The method of claim 1 , wherein the one or more single cells comprises T cells, B cells, tumor cells, myeloid cells, blood cells, or a mixture thereof.
5. The method of claim 1 , wherein the at least one secreted factor comprises a cytokine, a hormone, a molecular toxin, or any combination thereof.
6. The method of claim 1 , wherein the secreted factor-binding reagent and the capture probe are capable of binding to distinct epitopes of the same secreted factor.
7. The method of claim 1 , wherein one or more of the secreted factor-binding reagents and the capture probe comprise an antibody or fragment thereof.
8. A method for measuring the number of copies of a secreted factor secreted by one or more single cells and the number of copies of a nucleic acid target in one or more single cells, comprising:
contacting one or more single cells with a first plurality of dual capturing synthetic particles to form one or more single cells associated with a dual capturing synthetic particle, wherein the one or more single cells comprise a surface cellular target and copies of a nucleic acid target, wherein the one or more single cells are capable of secreting a plurality of secreted factors, wherein each dual capturing synthetic particle comprises a plurality of capture probes and a plurality of anchor probes, wherein each of the plurality of anchor probes is capable of specifically binding to the surface cellular target, and wherein the capture probe is capable of specifically binding to at least one of the plurality of secreted factors secreted by a single cell;
contacting the one or more single cells associated with a dual capturing synthetic particle with a plurality of secreted factor-binding reagents capable of specifically binding to a secreted factor bound by a capture probe, wherein each of the plurality of secreted factor-binding reagents comprises a secreted factor-binding reagent specific oligonucleotide comprising a unique factor identifier sequence for the secreted factor-binding reagent;
hybridizing a plurality of oligonucleotide barcodes with the secreted factor-binding reagent specific oligonucleotides and the copies of the nucleic acid target, wherein the oligonucleotide barcodes each comprise a first molecular label;
extending the plurality of oligonucleotide barcodes hybridized to the copies of a nucleic acid target to generate a plurality of barcoded nucleic acid molecules each comprising a sequence complementary to at least a portion of the nucleic acid target and the first molecular label;
extending the plurality of oligonucleotide barcodes hybridized to the secreted factor-binding reagent specific oligonucleotides to generate a plurality of barcoded secreted factor-binding reagent specific oligonucleotides each comprising a sequence complementary to the unique factor identifier sequence and the first molecular label;
obtaining sequencing data of the plurality of barcoded nucleic acid molecules to determine the copy number of the nucleic acid target in at least one of the one or more single cells; and
obtaining sequencing data of the plurality of barcoded secreted factor-binding reagent specific oligonucleotides to determine the number of copies of the at least one secreted factor secreted by at least one of the one or more single cells.
9. The method of claim 3 , wherein the plurality of oligonucleotide barcodes are associated with a barcoding synthetic particle, wherein the first partition and/or second partition is a well or a droplet, and wherein a second partition of the plurality of second partitions comprises a single barcoding synthetic particle.
10. The method of claim 1 , wherein each oligonucleotide barcode comprises a first universal primer sequence, and wherein the plurality of barcoded secreted factor-binding reagent specific oligonucleotides comprise a complement of the first universal primer sequence.
11. The method of claim 10 , wherein the secreted factor-binding reagent specific oligonucleotide comprises a second universal primer sequence, and wherein obtaining sequencing data of the plurality of barcoded secreted factor-binding reagent specific oligonucleotides comprises:
amplifying the plurality of barcoded secreted factor-binding reagent specific oligonucleotides using a primer capable of hybridizing to the first universal primer sequence, or a complement thereof, and a primer capable of hybridizing to the second universal primer sequence, or a complement thereof, to generate a plurality of amplified barcoded secreted factor-binding reagent specific oligonucleotides; and
obtaining sequencing data of the plurality of amplified barcoded secreted factor-binding reagent specific oligonucleotides.
12. The method of claim 1 , wherein the secreted factor-binding reagent specific oligonucleotide comprises a second molecular label, and wherein: (i) the second molecular label sequences of at least two secreted factor-binding reagent specific oligonucleotides are different, and wherein the unique identifier sequences of the at least two secreted factor-binding reagent specific oligonucleotides are identical; or (ii) the second molecular label sequences of at least two secreted factor-binding reagent specific oligonucleotides are different, and wherein the unique identifier sequences of the at least two secreted factor-binding reagent specific oligonucleotides are different.
13. The method of claim 1 , wherein the number of distinct first molecular label sequences associated with the unique factor identifier sequence for the secreted factor-binding reagent capable of specifically binding to the at least one secreted factor in the sequencing data indicates the number of copies of the at least one secreted factor secreted by at least one of the one or more single cells.
14. The method of claim 12 , wherein the number of distinct second molecular label sequences associated with the unique factor identifier sequence for the secreted factor-binding reagent capable of specifically binding to the at least one secreted factor in the sequencing data indicates the number of copies of the at least one secreted factor secreted by at least one of the one or more single cells.
15. The method of claim 1 , comprising determining the number of copies of the at least one secreted factor secreted by at least one of the one or more single cells based on the number of first molecular labels and/or second molecular labels with distinct sequences associated with the plurality of barcoded secreted factor-binding reagent specific oligonucleotides in the sequencing data.
16. The method of claim 11 , comprising determining the number of copies of the at least one secreted factor secreted by at least one of the one or more single cells based on the number of first molecular labels and/or second molecular labels with distinct sequences associated with the plurality of amplified barcoded secreted factor-binding reagent specific oligonucleotides in the sequencing data.
17. The method of claim 1 , wherein the capturing synthetic particle has the dimensions of a cell, wherein the cell is a mammalian cell, a yeast cell, an insect cell, a plant cell, or a bacterial cell.
18. The method of claim 8 , wherein the surface cellular target comprises a carbohydrate, a lipid, a protein, or any combination thereof.