Fluorescent chemical compounds having high selectivity for double stranded DNA, and methods for their use

• US 7,943,777 B2
• Filed: 10/05/2009
• Issued: 05/17/2011
• Est. Priority Date: 05/11/2005
• Status: Active Grant

• Current Assignee: Life Technologies Corporation (Thermo Fisher Scientific Incorporated)
• Original Assignee: Life Technologies Corporation (Thermo Fisher Scientific Incorporated)
• Inventors: Huang, Shih-Jung, Bradford, Jolene, Pinson, Patrick, Cheung, Ching-Ying, Yue, Stephen
• Primary Examiner(s): Chandrakumar; Nizal S
• Application Number:
  US12/573,809
• Publication Number:
  US 20100143917A1
• Time in Patent Office: 589 Days
• Field of Search: 435/29, 546/153, 546/159, 548/159
• US Class Current: 548/159
• CPC Class Codes: C07D 215/10 Quaternary compounds
• CPC Class Codes: C07D 215/227 only one oxygen atom which is attached in position 2
• CPC Class Codes: C07D 277/72 2-Mercaptobenzothiazole
• CPC Class Codes: C07D 277/74 Sulfur atoms substituted by carbon atoms
• CPC Class Codes: C07D 417/04 directly linked by a ring-member-to-ring-member bond
• CPC Class Codes: C07D 417/06 linked by a carbon chain containing only aliphatic carbon atoms
• CPC Class Codes: C07D 417/14 containing three or more hetero rings
• CPC Class Codes: C12Q 1/6876 Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
• CPC Class Codes: G01N 2021/6439 with indicators, stains, dyes, tags, labels, marks
• CPC Class Codes: G01N 21/6428 Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" in vivo A61B5/00; immunoassay G01N33/53
• CPC Class Codes: G01N 21/6486 Measuring fluorescence of biological material, e.g. DNA, RNA, cells G01N21/6428 takes precedence
• CPC Class Codes: G01N 2201/06113 Coherent sources; lasers
• CPC Class Codes: G01N 33/582 with fluorescent label
• CPC Class Codes: Y10T 436/143333 Saccharide [e.g., DNA, etc.]

Abstract

Chemical compounds having a high selectivity for double stranded DNA over RNA and single stranded DNA are disclosed. The chemical compounds are stains that become fluorescent upon illumination and interaction with double stranded DNA, but exhibit reduced or no fluorescence in the absence of double stranded DNA. The compounds can be used in a variety of biological applications to qualitatively or quantitatively assay DNA, even in the presence of RNA.

Claims

1. A process for preparing a compound of structural formula (I) or (II)

2. The process of claim 1, wherein R⁹ comprises an aryl group.

3. The process of claim 2, wherein the aryl group is connected directly by a covalent bond.

4. The process of claim 2, wherein the aryl group is connected indirectly by one or more methylene groups.

5. The process of claim 4, wherein the R⁹ is a benzyl group.

6. The process of claim 1, wherein R¹² is C₁-C₈ alkyl.

7. The process of claim 1, wherein R¹² is methyl.

8. The process of claim 1, wherein each of R⁵, R⁶, R⁷, and R⁸ is hydrogen.

9. The process of claim 1, wherein one or more of R⁵, R⁶, R⁷, and R⁸ is alkoxy.

10. The process of claim 1, wherein the compound prepared is of structural formula (I).

11. The process of claim 1, wherein the compound prepared is of structural formula (II).