Linkers and methods for optical detection and sequencing
The present disclosure provides labeling reagents for labeling substrates such as nucleotides, proteins, antibodies, lipids, and cells. The labeling reagents provided herein may comprise fluorescent labels and semi-rigid linkers. Methods for nucleic acid sequencing using materials comprising such labeling reagents are also provided here.
1. A method, comprising:
(a) contacting a nucleic acid molecule with a solution comprising a plurality of non-terminated nucleotides under conditions sufficient to incorporate, in succession, a first nucleotide and a second nucleotide of said plurality of non-terminated nucleotides into a growing strand that is complementary to said nucleic acid molecule, wherein said first nucleotide is labeled, and wherein at least about 20% of said plurality of non-terminated nucleotides are labeled nucleotides;
(b) detecting one or more signals or signal changes from said first nucleotide, wherein said one or more signals or signal changes are indicative of incorporation of said first nucleotide; and
(c) resolving said one or more signals or signal changes to determine a sequence of said nucleic acid molecule.
2. The method of claim 1 , wherein said plurality of non-terminated nucleotides comprises nucleotides of a same canonical base type.
3. The method of claim 1 , wherein said first nucleotide comprises a fluorescent dye.
4. The method of claim 3 , wherein said fluorescent dye is cleavable.
5. The method of claim 4 , further comprising:
(i) cleaving said fluorescent dye;
(ii) contacting said nucleic acid molecule with a second solution comprising a second plurality of non-terminated nucleotides under conditions sufficient to incorporate a third nucleotide of said second plurality of non-terminated nucleotides into said growing strand, wherein at least about 20% of said second plurality of non-terminated nucleotides are labeled nucleotides, wherein said third nucleotide is a labeled nucleotide;
(iii) detecting one or more second signals or signal changes from said third nucleotide; and
(iv) resolving said one or more second signals or signal changes to determine a second sequence of said nucleic acid molecule.
6. The method of claim 5 , wherein said plurality of non-terminated nucleotides and said second plurality of non-terminated nucleotides comprise nucleotides of different canonical base types.
7. The method of claim 5 , wherein said third nucleotide comprises an additional fluorescent dye of a same type as said fluorescent dye.
8. The method of claim 1 , further comprising:
(i) contacting said nucleic acid molecule with a second solution comprising a second plurality of non-terminated nucleotides under conditions sufficient to incorporate a third nucleotide of said second plurality of non-terminated nucleotides into said growing strand, wherein at least about 20% of said second plurality of non-terminated nucleotides are labeled nucleotides, wherein said third nucleotide is a labeled nucleotide;
(ii) detecting one or more second signals or signal changes from said third nucleotide; and
(iii) resolving said one or more second signals or signal changes to determine a second sequence of said nucleic acid molecule.
9. The method of claim 8 , wherein said plurality of non-terminated nucleotides and said second plurality of non-terminated nucleotides comprise nucleotides of different canonical base types.
10. The method of claim 8 , wherein said plurality of non-terminated nucleotides and said second plurality of non-terminated nucleotides comprise nucleotides of a same canonical base type.
11. The method of claim 8 , wherein said third nucleotide comprises a fluorescent dye.
12. The method of claim 11 , wherein said contacting in (i) is performed in absence of cleaving a fluorescent dye from said first nucleotide.
13. The method of claim 11 , further comprising repeating (i)-(iii) at least 5 times, each with a different solution of non-terminated nucleotides that comprises at least 20% labeled nucleotides, in absence of cleaving a fluorescent dye from said first nucleotide.
14. The method of claim 1 , wherein at least about 50%, 70%, 80%, 90%, 95%, or 99% of said plurality of non-terminated nucleotides are labeled nucleotides.
15. The method of claim 1 , wherein substantially all of said plurality of non-terminated nucleotides are labeled nucleotides.
16. The method of claim 1 , wherein said resolving in (c) comprises determining a number of consecutive nucleotides from said solution incorporated into said growing strand.
17. The method of claim 16 , wherein said number is selected from the group consisting of 2, 3, 4, 5, 6, 7, or 8 nucleotides.
18. The method of claim 16 , wherein said resolving in (c) comprises processing a tolerance of said solution, wherein said tolerance comprises a comparison of a ratio of incorporated labeled nucleotides to incorporated unlabeled nucleotides in said solution.
19. The method of claim 1 , wherein said second nucleotide is unlabeled.
20. The method of claim 1 , wherein said second nucleotide is labeled.
21. The method of claim 1 , wherein said first nucleotide and said second nucleotide are labeled.
22. The method of claim 21 , wherein (b) comprises detecting one or more signals or signal changes from said first nucleotide and said second nucleotide.
23. The method of claim 22 , wherein (c) comprises resolving said one or more signals or signal changes from said first nucleotide and said second nucleotide incorporated into said growing strand.