Methods and compositions for labeling nucleic acids
First Claim
1. A method of dually labeling a nucleic acid polymer, comprising steps of:
- providing a nucleic acid polymer comprising at least one first nucleotide analogue that comprises a first reactive unsaturated group and at least one second nucleotide analogue that comprises a second reactive unsaturated group;
contacting the nucleic acid polymer with a first reagent comprising a third reactive unsaturated group attached to a first label, such that a [3+2]cycloaddition occurs between the first and third unsaturated groups; and
contacting the nucleic acid polymer with a second reagent comprising a fourth reactive unsaturated group attached to a second label, such that a [3+2]cycloaddition occurs between the second and fourth unsaturated groups;
wherein the first reactive unsaturated group comprises a first 1,3-dipole and the third reactive unsaturated group comprises a first dipolarophile, the second reactive unsaturated group comprises a second dipolarophile and the fourth reactive unsaturated group comprises a second 1,3-dipole, orwherein the first reactive unsaturated group comprises a first dipolarophile and the third reactive unsaturated group comprises a first 1,3-dipole, the second reactive unsaturated group comprises a second 1,3-dipole and the fourth reactive unsaturated group comprises a second dipolarophile.
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Abstract
The present invention relates to methods for the labeling of nucleic acid polymers in vitro and in vivo. In particular, the methods include a [3+2] cycloaddition between a nucleotide analog incorporated into a nucleic acid polymer and a reagent attached to a label. Such methods do not require fixation and denaturation and therefore can be applied to the labeling of nucleic acid polymers in living cells and in organisms. Also provided are methods for measuring cellular proliferation. In these methods, the amount of label incorporated into the DNA is measured as an indication of cellular proliferation. The methods of the invention can be used in a wide variety of applications including clinical diagnosis of diseases and disorders in which cellular proliferation is involved, toxicity assays, and as a tool for the study of chromosomes'"'"' ultrastructures.
31 Citations
11 Claims
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1. A method of dually labeling a nucleic acid polymer, comprising steps of:
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providing a nucleic acid polymer comprising at least one first nucleotide analogue that comprises a first reactive unsaturated group and at least one second nucleotide analogue that comprises a second reactive unsaturated group; contacting the nucleic acid polymer with a first reagent comprising a third reactive unsaturated group attached to a first label, such that a [3+2]cycloaddition occurs between the first and third unsaturated groups; and contacting the nucleic acid polymer with a second reagent comprising a fourth reactive unsaturated group attached to a second label, such that a [3+2]cycloaddition occurs between the second and fourth unsaturated groups; wherein the first reactive unsaturated group comprises a first 1,3-dipole and the third reactive unsaturated group comprises a first dipolarophile, the second reactive unsaturated group comprises a second dipolarophile and the fourth reactive unsaturated group comprises a second 1,3-dipole, or wherein the first reactive unsaturated group comprises a first dipolarophile and the third reactive unsaturated group comprises a first 1,3-dipole, the second reactive unsaturated group comprises a second 1,3-dipole and the fourth reactive unsaturated group comprises a second dipolarophile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification