Compositions for detection and analysis of polynucleotides using light harvesting multichromophores
First Claim
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1. An assay method comprising:
- i. providing a sample that is suspected of comprising a target polynucleotide;
ii. providing a conjugated polymer that upon excitation is capable of transferring energy to a signaling chromophore when in proximity thereto;
iii. providing a sensor peptide nucleic acid (PNA) and a signaling chromophore, wherein the sensor PNA is single-stranded and is complementary to the target polynucleotide;
iv. contacting the sample, the sensor PNA and signaling chromophore and the conjugated polymer in a solution under conditions in which the sensor PNA can hybridize to the target polynucleotide, if present; and
v. determining if the sensor PNA and target polynucleotide have hybridized by detecting if light is produced from the signaling chromophore upon excitation of the conjugated polymer, indicating that the conjugated polymer and signaling chromophore are in proximity and associated with the target polynucleotide.
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Abstract
Methods, compositions and articles of manufacture for assaying a sample for a target polynucleotide are provided. A sample suspected of containing the target polynucleotide is contacted with a polycationic multichromophore and a sensor PNA complementary to the target polynucleotide. A signaling chromophore absorbs energy from the excited multichromophore and emits light in the presence of the target polynucleotide. The methods can be used in multiplex form. Kits having reagents for performing such methods are also provided.
50 Citations
23 Claims
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1. An assay method comprising:
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i. providing a sample that is suspected of comprising a target polynucleotide; ii. providing a conjugated polymer that upon excitation is capable of transferring energy to a signaling chromophore when in proximity thereto; iii. providing a sensor peptide nucleic acid (PNA) and a signaling chromophore, wherein the sensor PNA is single-stranded and is complementary to the target polynucleotide; iv. contacting the sample, the sensor PNA and signaling chromophore and the conjugated polymer in a solution under conditions in which the sensor PNA can hybridize to the target polynucleotide, if present; and v. determining if the sensor PNA and target polynucleotide have hybridized by detecting if light is produced from the signaling chromophore upon excitation of the conjugated polymer, indicating that the conjugated polymer and signaling chromophore are in proximity and associated with the target polynucleotide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 20, 21, 22, 23)
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13. A polynucleotide sensing solution comprising:
a sensor peptide nucleic acid (PNA), a signaling chromophore, a conjugated polymer, and a solvent, wherein the sensor PNA is complementary to a target polynucleotide, and the conjugated polymer can interact with the phosphate backbone of the target polynucleotide and is capable of transferring energy to the signaling chromophore upon excitation when in proximity thereto upon hybridization of the sensor PNA to the target polynucleotide, wherein a greater amount of energy is emitted from the signaling chromophore upon excitation of the conjugated polymer in the presence of the polynucleotide being sensed than from direct excitation of the signaling chromophore. - View Dependent Claims (14)
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15. A kit for assaying a sample for a target polynucleotide comprising:
a sensor peptide nucleic acid (PNA), a signaling chromophore, and a conjugated polymer, wherein the sensor PNA is single-stranded and is complementary to a target polynucleotide, and the conjugated polymer can interact with the phosphate backbone of the target polynucleotide and is capable of transferring energy to the signaling chromophore upon excitation when in proximity thereto upon hybridization of the sensor PNA to the target polynucleotide, wherein a greater amount of energy is emitted from the signaling chromophore upon excitation of the conjugated polymer in the presence of the polynucleotide being sensed than from direct excitation of the signaling chromophore.
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16. An energy transfer assay method for detecting a target polynucleotide in a sample comprising contacting a sample with a light harvesting luminescent conjugated polymer and a sensor peptide nucleic acid (PNA) in a predominantly aqueous solution in the presence of a signaling chromophore, wherein emission of a wavelength of light characteristic of the signaling chromophore upon excitation of the luminescent conjugated polymer indicates the presence in the sample of the target polynucleotide, and wherein the emission from the signaling chromophore is greater than that obtained from direct excitation of the signaling chromophore.
- 17. An energy transfer complex comprising a sensor peptide nucleic acid, a target polynucleotide, a conjugated polymer, and a signaling chromophore capable of receiving energy from an excited state of the conjugated polymer.
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19. A method of detecting complex formation via fluorescence energy transfer comprising (a) adding a conjugated polymer to a solution comprising a target polynucleotide, a peptide nucleic acid (PNA) and a signaling chromophore, thereby forming a complex comprising the conjugated polymer and the signaling chromophore;
- and (b) detecting light emission from the signaling chromophore by exciting the conjugated polymer, wherein the light emission from the complex is greater than the amount of light emission obtained upon direct excitation of the signaling chromophore.
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