Co-detection of single polypeptide and polynucleotide molecules

• US 20090088982A1
• Filed: 07/31/2004
• Published: 04/02/2009
• Est. Priority Date: 07/31/2003
• Status: Abandoned Application

• Current Assignee: Singulex, Inc.
• Original Assignee: Singulex, Inc.
• Inventors: Puskas, Robert S., Fukushima, Noelle H.
• Application Number:
  US11/659,057
• Publication Number:
  US 20090088982A1
• Time in Patent Office: Days
• US Class Current: 702/23
• CPC Class Codes: C12Q 1/6825 Nucleic acid detection involving sensors
• CPC Class Codes: G01N 33/5308 for analytes not provided for elsewhere, e.g. nucleic acids, uric acid, worms, mites

Abstract

The invention relates to a method for co-detecting and distinguishing individual polypeptide and polynucleotide molecules in a single sample analysis. The polypeptide and polynucleotide targets which emit electromagnetic radiation are labeled with probes that emit electromagnetic radiation at the same emission wavelength, are suspended in fluid and moved through an interrogation volume allowing co-detection of low concentrations of individual molecules and discrimination based on characteristics other than emission wavelength.

Claims

1. A method for co-detecting a polynucleotide molecule and a polypeptide molecule contained within one sample comprising:

(a) moving said polynucleotide molecule and said polypeptide molecule through at least one interrogation volume; and

(b) measuring at least one electromagnetic characteristic of said polynucleotide molecule and measuring at least one electromagnetic characteristic of said polypeptide molecule,

wherein said polynucleotide molecule and said polypeptide molecule are co-detected.

2. A method according to claim 1, wherein the polynucleotide molecule and the polypeptide molecule are discriminated.

3. A method according to claim 1, wherein the electromagnetic characteristic of the polynucleotide molecule and polypeptide molecule are measured simultaneously or sequentially.

4. A method according to claim 1, wherein a plurality of the same polynucleotide molecule and a plurality of the same polypeptide molecule are co-detected.

5. A method according to claim 1, wherein a plurality of different polynucleotide molecules and a plurality of different polypeptide molecules are co-detected.

6. A method according to claim 1, wherein a plurality of the same or different polynucleotide molecules and a plurality of the same or different polypeptide molecules are co-detected.

7. A method according to claim 1, wherein the polynucleotide is selected from the group consisting of a single-stranded DNA, a double-stranded DNA, an oligonucleotide, an RNA, a dendrimer, a nucleic acid hybrid and any combination thereof.

8. A method according to claim 1, wherein the polypeptide is selected from the group consisting of an oligopeptide and a protein.

9. A method according to claim 1, wherein the polypeptide electromagnetic characteristic and the polynucleotide electromagnetic characteristic are measured within at least one interrogation volume, said interrogation volume being in electromagnetic communication with at least one detector and at least one excitation source.

10. A method according to claim 9, wherein the interrogation volume is fluidly connected to at least one other interrogation volume.

11. A method according to claim 9, wherein the sample comprises a plurality of the same or different polynucleotide molecules and a plurality of the same or different polypeptide molecules, and wherein act (b) further comprises:

measuring at least one of a first or a second electromagnetic characteristic of at least one polynucleotide molecule as the at least one polynucleotide molecule interacts with an excitation source within a first interrogation volume;

measuring at least one of a first or a second electromagnetic characteristic of the at least one polynucleotide molecule as the at least one polynucleotide molecule interacts with an excitation source within a second interrogation volume;

comparing the measured electromagnetic characteristics measured within the first and the second interrogation volumes of the at least one polynucleotide;

measuring at least one of a first or a second electromagnetic characteristic of the at least one polypeptide molecule as the at least one polypeptide molecule interacts with an excitation source within the first, the second or a third interrogation volume;

measuring at least one of a first or a second electromagnetic characteristic of the at least one polypeptide molecule as the at least one polypeptide molecule interacts with an excitation source within the first, the second or a fourth interrogation volume; and

comparing the measured electromagnetic characteristics measured within the first, the second, the third and the fourth interrogation volumes of the at least one polypeptide.

12. A method according to claim 11, wherein the act of comparing comprises distinguishing by statistical analysis the measured electromagnetic characteristics of the at least one polypeptide molecule and the at least one polypeptide molecule from background electromagnetic characteristics.

13. A method according to claim 12, wherein the act of comparing comprises cross-correlating the measured electromagnetic emissions determined from the at least one polypeptide molecule and the at least one polypeptide molecule to determine the velocity of the molecules.

14. A method according to claim 12, wherein the act of comparing comprises cross-correlating the measured electromagnetic emissions to determine the velocity of the molecules.

15. A method according to claim 1, wherein act (a) comprises subjecting the sample to a motive force selected from the group consisting of electro-kinetic, pressure, vacuum, surface tension, gravity, centrifugal, and any combination thereof.

16. A method according to claim 15, wherein the act of moving the molecules between a first interrogation volume and a second interrogation volume further comprises subjecting the molecules to a separation method selected from the group consisting of capillary gel electrophoresis, micellar electro-kinetic chromatography, isotachophoresis, and any combination thereof.

17. A method according to claim 1, wherein at least one of the measurable characteristics of the polynucleotide molecule and at least one of the measurable characteristics of the polypeptide molecule is produced by one of an intrinsic parameter of the molecule and an extrinsic parameter of the molecule.

18. A method according to claim 17, further comprising marking the polynucleotide molecule and the polypeptide molecule with at least one label to provide the extrinsic parameter.

19. A method according to claim 18, wherein the polynucleotide molecule and polypeptide molecule are labeled prior to performing act (a).

20. A method according to claim 19, wherein at least one polynucleotide and at least one polypeptide are labeled in separate reactions and are combined to create the sample prior to performing act (a).

21-91. -91. (canceled)