Linker element and method of using same to construct sequencing library
First Claim
1. A method for constructing a sequencing library which uses a linker element consisting of a linker A and a linker B, wherein the linker A is generated from the complementary pairing of a long strand of nucleic acid and a short strand of nucleic acid, wherein the long strand has a phosphate modification at the 5′
- end and the short strand has a blocking modification at the 3′
end, and has an enzyme active site in the short strand; and
the linker B is a single-stranded nucleic acid, and the 3′
end thereof can be complementary to the 5′
end of the long strand of the linker A but the rest part cannot be complementary to the linker A,wherein the method comprises the steps of;
(1) fragmenting a DNA to be tested;
(2) dephosphorylating and blunt-end repairing the DNA fragments obtained in step
1);
(3) linker ligations;
linker A ligation;
the linker A is added to both ends of the DNA fragments obtained in Step (2) by a ligation reaction;
enzyme treatment and phosphorylation;
depending on the enzyme active site in the short strand of the A linker, the DNA fragments ligated with the linker A are treated with the corresponding enzyme, and the unlinked 5′
ends of the fragments are phosphorylated; and
linker B ligation;
through a ligation reaction, the linker B is added to both ends of the DNA fragments ligated with the linker A; and
(4) amplification of DNA fragments;
polymerase chain reaction is carried out using the DNA fragments obtained in Step (3) as a template and using single-stranded nucleic acids C and D, which are complementary to the long strand of the linker A and the nucleic acid strand of the linker B, as primers,upon which steps the sequencing library is obtained.
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Accused Products
Abstract
Provided is a linker element and a method of using the linker element to construct a sequencing library, wherein the linker element consists of a linker A and a linker B, the linker A is obtained through the complementary pairing of a long nucleic acid strand and a short nucleic acid strand, the 5′ end of the long strand has a phosphoric acid modification, and the 3′ end of the short strand has an enclosed modification, with enzyme sites in the short strand; and the linker B is a nucleic acid single strand, and the 3′ end thereof can be in a complementary pairing with the 5′ end of the long strand of the linker A. Using the linker element of the present invention for constructing a sequencing library ensures the linking directionality of the linkers while solving the problems of fragment interlinking, linker self-linking and low linking efficiency, and reducing the purification reaction between steps, shortening the linking time and reducing costs.
2 Citations
7 Claims
-
1. A method for constructing a sequencing library which uses a linker element consisting of a linker A and a linker B, wherein the linker A is generated from the complementary pairing of a long strand of nucleic acid and a short strand of nucleic acid, wherein the long strand has a phosphate modification at the 5′
- end and the short strand has a blocking modification at the 3′
end, and has an enzyme active site in the short strand; and
the linker B is a single-stranded nucleic acid, and the 3′
end thereof can be complementary to the 5′
end of the long strand of the linker A but the rest part cannot be complementary to the linker A,wherein the method comprises the steps of; (1) fragmenting a DNA to be tested; (2) dephosphorylating and blunt-end repairing the DNA fragments obtained in step
1);(3) linker ligations; linker A ligation;
the linker A is added to both ends of the DNA fragments obtained in Step (2) by a ligation reaction;enzyme treatment and phosphorylation;
depending on the enzyme active site in the short strand of the A linker, the DNA fragments ligated with the linker A are treated with the corresponding enzyme, and the unlinked 5′
ends of the fragments are phosphorylated; andlinker B ligation;
through a ligation reaction, the linker B is added to both ends of the DNA fragments ligated with the linker A; and(4) amplification of DNA fragments;
polymerase chain reaction is carried out using the DNA fragments obtained in Step (3) as a template and using single-stranded nucleic acids C and D, which are complementary to the long strand of the linker A and the nucleic acid strand of the linker B, as primers,upon which steps the sequencing library is obtained. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- end and the short strand has a blocking modification at the 3′
Specification