Gene synthesis by convergent assembly of oligonucleotide subsets
First Claim
1. A method of synthesizing a polynucleotide on a solid support from a set of oligonucleotide precursors, the method comprising the steps of:
- repeatedly partitioning a polynucleotide into candidate subunits and for each candidate subunit generating tilings of oligonucleotide precursors that cover the candidate subunit, the oligonucleotide precursors being selected from a set containing every sequence of a predetermined length;
selecting a partition wherein each candidate subunit has a tiling of oligonucleotide precursors each free of palindromic sequences and comprises a subset of oligonucleotide precursors capable of annealing together to form a unique duplex, thereby producing an ordered set of palindromeless subunits; and
successively ligating the subsets of oligonucleotide precursors of the palindromeless subunits to an initializing duplex with a complementary end in a single reaction to form a unique duplex, the initializing duplex being attached to a solid support, and each subset being ligated in an order corresponding to the ordered set of palindromeless subunits to form the polynucleotide.
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Abstract
The invention provides a system and method for synthesizing polynucleotides by solid phase assembly oligonucleotide precursors, in accordance with the method, a polynucleotide is partitioned into an ordered set of subunits, wherein each subunit is assembled in a single reaction from a subset of oligonucleotide precursors that uniquely anneal together to produce the subunit. The subunits are then assembled to form the desired polynucleotide. An important feature of the invention is the selection of subunits that are free of undesired sequence elements, such as palindromes, repetitive sequences, and the like, which would result in more than one subunit product alter ligating a pool of oligonucleotide precursors.
23 Citations
18 Claims
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1. A method of synthesizing a polynucleotide on a solid support from a set of oligonucleotide precursors, the method comprising the steps of:
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repeatedly partitioning a polynucleotide into candidate subunits and for each candidate subunit generating tilings of oligonucleotide precursors that cover the candidate subunit, the oligonucleotide precursors being selected from a set containing every sequence of a predetermined length; selecting a partition wherein each candidate subunit has a tiling of oligonucleotide precursors each free of palindromic sequences and comprises a subset of oligonucleotide precursors capable of annealing together to form a unique duplex, thereby producing an ordered set of palindromeless subunits; and successively ligating the subsets of oligonucleotide precursors of the palindromeless subunits to an initializing duplex with a complementary end in a single reaction to form a unique duplex, the initializing duplex being attached to a solid support, and each subset being ligated in an order corresponding to the ordered set of palindromeless subunits to form the polynucleotide. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of synthesizing a polynucleotide from a set of oligonucleotide precursors, the method comprising the steps of:
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repeatedly partitioning a polynucleotide into candidate subunits and for each candidate subunit generating tilings of oligonucleotide precursors that cover the candidate subunit, the oligonucleotide precursors being selected from a set containing every sequence of a predetermined length; selecting a partition wherein each candidate subunit has a tiling of oligonucleotide precursors each free of palindromic sequences and comprises a subset of oligonucleotide precursors capable of annealing together to form a unique duplex, thereby producing an ordered set of palindromeless subunits, wherein each palindromeless subunit overlaps adjacent palindromeless subunits of the ordered set and the ordered set includes terminal subunits each having a primer binding site releasably attached thereto; synthesizing each palindromeless subunit of the ordered set on a separate solid support by ligating a subset of oligonucleotide precursors to a complementary end of an initializing duplex attached the solid support in a single reaction to form a unique duplex; and combining in a polymerase chain reaction the palindromeless subunits from the solid supports and primers specific for the primer binding sites of the terminal subunits so that the palindromeless subunits and primers undergo successive cycles of denaturation and polymerase extension until the polynucleotide is formed. - View Dependent Claims (8, 9)
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10. A method of synthesizing a polynucleotide from a set of oligonucleotide precursors, the method comprising the steps of:
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(a) repeatedly partitioning a polynucleotide into candidate subunits and for each candidate subunit generating tilings of oligonucleotide precursors that cover the candidate subunit, the oligonucleotide precursors being selected from a set containing every sequence of a predetermined length; (b) selecting a partition wherein each candidate subunit has a tiling of oligonucleotide precursors each free of palindromic sequences and comprises a subset of oligonucleotide precursors capable of annealing together to form a unique duplex, thereby producing an ordered set of palindromeless subunits; (c) ligating the oligonucleotide precursors of each subset to an initializing duplex with a complementary end in a single reaction to form a unique duplex comprising a palindromeless subunit that is releasably attached to a solid support; (d) repeating step (c) until the ordered set of palindromeless subunits is synthesized; and (e) ligating the ordered set of palindromeless subunits together to form the polynucleotide. - View Dependent Claims (11, 12, 13, 14)
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15. A system for synthesizing a polynucleotide from a set of oligonucleotide precursors, the system comprising:
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a source of oligonucleotide precursors, the source capable of providing a set of oligonucleotide precursors of every sequence of a predetermined length; an ordered set of palindromeless subunits with respect to the set of oligonucleotide precursors, the ordered set of palindromeless subunits covering the polynucleotide, each palindromeless subunit overlapping adjacent palindromeless subunits of the ordered set, the ordered set including terminal subunits each having a primer binding site releasably attached thereto, and each palindromeless subunit comprising a subset of oligonucleotide precursors capable of annealing together to form a unique duplex; wherein the ordered set of palindromeless subunits is generated by repeatedly partitioning the polynucleotide into candidate subunits and for each candidate subunit generating tilings of oligonucleotide precursors which cover the candidate subunit until a tiling of each candidate subunit is obtained, that comprises a subset of oligonucleotide precursors without palindromic sequences; a plurality of reaction vessels for synthesizing each palindromeless subunit of the ordered set on a separate solid support by ligating a subset of oligonucleotide precursors to a complementary end of an initializing duplex attached the solid support in a single reaction; and a second reaction vessel for combining in a polymerase chain reaction the palindromeless subunits from the solid supports and primers specific for the primer binding sites of the terminal subunits so that the palindromeless subunits and primers undergo successive cycles of denaturation and polymerase extension until the polynucleotide is formed. - View Dependent Claims (16, 17, 18)
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Specification