Isolation of polymerase-nucleic acid complexes
First Claim
1. A method for isolating DNA having a modified or unnatural base comprising:
- obtaining a library of circular DNA fragments each comprising a double stranded DNA central region and single stranded regions on the ends of the double stranded regions wherein at least some of the fragments comprise one or more modified or unnatural base;
treating the DNA fragments with a primer and a polymerase under conditions where the polymerase extends the primer to copy at least a portion of one strand of the double stranded region so as to render the other strand of the double-stranded portion single stranded;
using a binding protein or antibody that is specific to the one or more modified or unnatural base on the portion of the circular DNA fragments that is rendered single stranded to isolate strands containing one or more modified or unnatural base from those that do not contain an unnatural or modified base.
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Abstract
Compositions, methods and systems are provided for isolating DNA having a modified or unnatural base. Circular DNA fragments, each comprising a double stranded DNA central region and single stranded regions on the ends of the double stranded regions, are obtained. Some of the fragments have one or more modified or unnatural base. The DNA fragments are treated with a primer and a polymerase such that the polymerase extends the primer to copy at least one of the strand of the double stranded region. This results in rendering the other strand single stranded. A binding protein or antibody that is specific to the modified or unnatural base is then used to isolate strands containing the modified or unnatural bases. Methods for loading such complexes onto substrates and for single molecule sequencing of such complexes are also provided.
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Citations
22 Claims
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1. A method for isolating DNA having a modified or unnatural base comprising:
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obtaining a library of circular DNA fragments each comprising a double stranded DNA central region and single stranded regions on the ends of the double stranded regions wherein at least some of the fragments comprise one or more modified or unnatural base; treating the DNA fragments with a primer and a polymerase under conditions where the polymerase extends the primer to copy at least a portion of one strand of the double stranded region so as to render the other strand of the double-stranded portion single stranded; using a binding protein or antibody that is specific to the one or more modified or unnatural base on the portion of the circular DNA fragments that is rendered single stranded to isolate strands containing one or more modified or unnatural base from those that do not contain an unnatural or modified base. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification