Direct cloning of PCR amplified nucleic acids
First Claim
1. A method of direct cloning of polymerase chain reaction amplified nucleic acids containing a target DNA segment, which method comprises:
- (a) subjecting said target DNA segment to polymerase chain reaction amplification to produce a plurality of double-stranded nucleic acids including said DNA segment, each of said nucleic acids having a single, overhanging dAMP residue located at each 3'"'"' terminus;
(b) forming a ligation reaction mixture by admixing the plurality of double-stranded nucleic acids with linear double-stranded DNA molecules, said linear DNA molecules each having a single, overhanging (unpaired) dTMP residue at each 3'"'"' terminus;
(c) maintaining said mixture under predetermined reaction conditions for a time period sufficient to effect ligation of the nucleic acids to the linear DNA molecules to produce recombinant DNA nucleic acid molecules; and
(d) transforming a compatible host cell line with said recombinant DNA molecules.
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Abstract
Methods are described for producing recombinant DNA molecules from suitable host vectors and nucleic acids subjected to 3'"'"'-terminal transferase activity. In one embodiment, the method takes advantage of the single 3'"'"'-deoxy-adenosine monophosphate (dAMP) residues attached to the 3'"'"' termini of PCR generated nucleic acids. Vectors are prepared with recognition sequences that afford single 3'"'"'-terminal deoxy-thymidine monophosphate (dTMP) residues upon reaction with a suitable restriction enzyme. Thus, PCR generated copies of genes can be directly cloned into the vectors without need for preparing primers having suitable restriction sites therein. The invention also contemplates associated plasmid vectors and kits for implementing the methods.
91 Citations
20 Claims
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1. A method of direct cloning of polymerase chain reaction amplified nucleic acids containing a target DNA segment, which method comprises:
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(a) subjecting said target DNA segment to polymerase chain reaction amplification to produce a plurality of double-stranded nucleic acids including said DNA segment, each of said nucleic acids having a single, overhanging dAMP residue located at each 3'"'"' terminus; (b) forming a ligation reaction mixture by admixing the plurality of double-stranded nucleic acids with linear double-stranded DNA molecules, said linear DNA molecules each having a single, overhanging (unpaired) dTMP residue at each 3'"'"' terminus; (c) maintaining said mixture under predetermined reaction conditions for a time period sufficient to effect ligation of the nucleic acids to the linear DNA molecules to produce recombinant DNA nucleic acid molecules; and (d) transforming a compatible host cell line with said recombinant DNA molecules. - View Dependent Claims (2)
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3. A method of direct cloning of polymerase chain reaction amplified nucleic acids containing a target DNA segment, which method comprises:
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(a) subjecting said target DNA segment to polymerase chain reaction amplification using a polymerase having 3'"'"'-terminal adenosine transferase activity to produce a plurality of double-stranded nucleic acids including the DNA segment, each of the nucleic acids having a single, overhanging 3'"'"'-dAMP residue at each 3'"'"'terminus; (b) reacting a DNA plasmid with at least one restriction enzyme to form a linear DNA molecule having a single overhanging 3'"'"'-dTMP residue at each DNA 3'"'"'terminus; (c) forming a ligation reaction mixture by combining the double-stranded nucleic acids and the linear plasmid molecules with a preselected ligase enzyme; (d) maintaining said admixture under predetermined reaction conditions for a time period sufficient to effect ligation of the nucleic acids to the linear plasmid molecules to produce recombinant DNA molecules; and (e) transforming a compatible host cell line with said recombinant DNA molecules. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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10. A kit for direct cloning of PCR amplified nucleic acids, which kit comprises, in separate containers:
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an aliquot of plasmids, said plasmids each having at least two nucleotide sequences recognized by at least one restriction enzyme capable of generating a single, overhanging 3'"'"'-dTMP group; and an aliquot of said restriction enzyme sufficient to cleave at least a portion of said plasmids. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A kit for direct cloning of PCR amplified nucleic acids, which kit comprises, in separate containers:
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an aliquot of lyophilized cloning plasmids, said plasmids each having at least two nucleotide sequences recognized by a restriction enzyme capable of generating a single, overhanging 3'"'"'-dTMP; and an aliquot of competent host cells capable of replicating said plasmids upon transformation therewith.
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18. A kit for direct cloning of PCR amplified nucleic acids, which kit comprises, in separate containers:
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an aliquot of linear plasmid DNA molecules having single, overhanging 3'"'"'-dTMP termini; an aliquot of control plasmids; an aliquot of each of forward and reverse PCR primers suitable for PCR amplification; an aliquot of a DNA ligase, said DNA ligase being capable of ligating a nucleic acid sequence containing 3'"'"'-dAMP overhangs into said linear plasmid DNA at said overhanging 3'"'"'-dTMP sites. - View Dependent Claims (19, 20)
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Specification