CONTROLLED ROLLING CIRCLE AMPLIFICATION
Disclosed herein, inter alia, are methods and compositions for improved circular polynucleotide amplification and detection.
1 . A method of forming single-stranded polynucleotides in situ, the method comprising:
(a) extending a first primer hybridized to a circular polynucleotide with a strand-displacing polymerase to generate a first extension product comprising one or more complements of the circular polynucleotide within a cell or tissue;
(b) contacting the first extension product with a second immobilized primer and extending the second immobilized primer with a polymerase to generate a second immobilized extension product, wherein the second primer is immobilized to a cellular component or a matrix within the cell or tissue; and
(c) nicking the first extension product with an endonuclease, thereby generating one or more polynucleotide fragments, and removing said polynucleotide fragments, thereby forming single-stranded polynucleotides in situ.
2 . The method of claim 1 , further comprising:
(d) hybridizing a detection probe to the second immobilized extension product and detecting said detection probe, thereby detecting the circular polynucleotide.
3 . The method of claim 1 , further comprising, prior to step (c), contacting the second immobilized extension product with a third immobilized primer and extending the third immobilized primer with a polymerase to generate a third immobilized extension product, wherein the third immobilized primer is covalently immobilized to the cellular component or the matrix within the cell or tissue.
4 . The method of claim 3 , wherein step (c) further comprises nicking the second immobilized extension product with an endonuclease, thereby generating one or more additional polynucleotide fragments.
5 . The method of claim 3 , further comprising, after step (c), detecting the second immobilized extension product; followed by detecting the third immobilized extension product.
6 . The method of claim 1 , further comprising, after step (c), sequencing the second immobilized extension product.
7 . The method of claim 4 , further comprising, after step (c), sequencing the third immobilized extension product.
8 . The method of claim 6 , wherein the sequencing comprises sequencing by synthesis, sequencing by hybridization, sequencing by binding, sequencing by ligation, or pyrosequencing.
9 . The method of claim 1 , further comprising binding a specific binding reagent to a protein in the cell or tissue, wherein the specific binding reagent includes an oligonucleotide barcode, and sequencing the oligonucleotide barcode.
10 . The method of claim 1 , prior to step (a), forming the circular polynucleotide by hybridizing a first sequence of a circularizable oligonucleotide to a target nucleic acid molecule and a second sequence of the circularizable oligonucleotide to the target nucleic acid molecule, and ligating the first sequence and the second sequence to form the circular polynucleotide.
11 . The method of claim 10 , wherein the first sequence and the second sequence are adjacent.
12 . The method of claim 10 , wherein the first sequence and the second sequence are separated by 1 or more nucleotides.
13 . A method of sequencing a circular polynucleotide, the method comprising:
i) amplifying the circular polynucleotide in a cell or tissue by extending a first primer hybridized to said circular polynucleotide with a strand-displacing polymerase to generate a first extension product comprising one or more complements of the circular polynucleotide;
ii) contacting the first extension product with a second primer and extending the second primer with a polymerase to generate a second immobilized extension product, wherein the second primer is immobilized to a cellular component or a matrix within the cell or tissue;
iii) nicking the first extension product with an endonuclease, thereby generating one or more polynucleotide fragments, and removing said polynucleotide fragments, thereby forming single-stranded polynucleotides on said solid support; and
iv) hybridizing a sequencing primer to the single-stranded polynucleotides, and extending the sequencing primer to generate a first sequencing read, wherein said sequencing primer is immobilized to a cellular component or a matrix within the cell or tissue.
14 . The method of claim 13 , further comprising, prior to step (iii), contacting the second immobilized extension product with a third primer and extending the third primer with a polymerase to generate a third immobilized extension product, wherein the third primer is immobilized to a cellular component or a matrix within the cell or tissue.
15 . The method of claim 14 , wherein step (iii) comprises nicking the second immobilized extension product with an endonuclease, thereby generating one or more additional polynucleotide fragments, and removing said additional polynucleotide fragments.
16 . The method of claim 12 , wherein the endonuclease comprises one or more endonucleases selected from the group consisting of Nb.BbvCI, Nb.BsmI, NbBsrDI, Nb.BtsI, Nt.AlwI, Nt.BbvCI, Nb.BssSI, Nt.BsmAI, Nt.BspQI, Nt.BstNBI, and Nt.CviPII.
17 . The method of claim 1 , wherein the circular polynucleotide comprises any one of SEQ ID NO:1 to SEQ ID NO:20, or a complement thereof.
18 . A kit comprising a circularizable probe, a ligase, and an endonuclease, wherein said circularizable probe comprises a first hybridization sequence capable of hybridizing to a first sequence of a target polynucleotide, a second hybridization sequence capable of hybridizing to a second sequence of said target polynucleotide, and a sequence recognized by said endonuclease.
19 . The kit of claim 18 , wherein the first sequence comprises a nucleic acid sequence encoding a B cell receptor V region, and wherein the second sequence comprises a nucleic acid sequence encoding a B cell receptor J region.
20 . The kit of claim 18 , wherein the circular polynucleotide comprises any one of SEQ ID NO:1 to SEQ ID NO:20, or a complement thereof.