PNA chip for determining genotypes of mycobacterial species using plastic substrate coated with epoxy group-containing polymer and method of determining genotypes of mycobacterial species using the PNA chip

• US 20060183148A1
• Filed: 02/15/2006
• Published: 08/17/2006
• Est. Priority Date: 02/16/2005
• Status: Active Grant

• Current Assignee: LG Life Sciences Limited (LG Corporation)
• Original Assignee: LG Life Sciences Limited (LG Corporation)
• Inventors: Park, Young Suk, Kim, In Soo, Kang, Jinseok, Jung, Gihune
• Granted Patent: US 7,417,138 B2
• Time in Patent Office: Days
• US Class Current: 435/6
• CPC Class Codes: B01J 2219/00605 the compounds being directly bound or immobilised to solid supports
• CPC Class Codes: B01J 2219/0061 The surface being organic
• CPC Class Codes: B01J 2219/00626 Covalent
• CPC Class Codes: B01J 2219/00637 by coating it with another layer
• CPC Class Codes: B01J 2219/00729 Peptide nucleic acids [PNA]
• CPC Class Codes: C12Q 1/6837 using probe arrays or probe chips C12Q1/6874 takes precedence
• CPC Class Codes: C12Q 1/689 for bacteria
• CPC Class Codes: C12Q 2525/107 incorporating a peptide nucleic acid
• CPC Class Codes: C12Q 2600/166 Oligonucleotides used as internal standards, controls or normalisation probes

Abstract

Provided are a PNA chip for determining the genotypes of mycobacterial species in which probe PNAs having DNA sequences of SEQ ID NOs: 5-28 are immobilized on a plastic substrate coated with an epoxy group-containing polymer, and a method of determining the genotypes of mycobacterial species using the PNA chip. According to the PNA chip and the method of determining the genotypes of mycobacterial species, the genotypes of mycobacterial species which are causes of tuberculosis and respiratory diseases can be determined within a short term with good sensitivity and specificity. Therefore, detection of the presence of mycobacterial species in test samples, and after confirmation of the presence of mycobacterial species, identification of the mycobacterial species and determination of whether or not the mycobacterial species are tuberculosis-causing mycobacterial species can be achieved promptly and accurately.

Claims

1. A peptide nucleic acid (PNA) chip for determining the genotypes of mycobacterial species wherein probe PNAs having DNA sequences of SEQ ID NOs:

5-28 are immobilized on a plastic substrate coated with an epoxy group-containing polymer.

2. The PNA chip of claim 1, wherein the plastic substrate is a transparent plastic substrate made of a material selected from the group consisting of polymethylmethacrylate (PMMA), polycarbonate (PC), polynorbonene, cyclic olefin copolymer (COC), fluorinated polyimide, polystyrene (PS), styrene-butadiene copolymer (SBC), acrylonitrile butadiene styrene (ABS), styrene acrylonitrile (SAN), and polysulfone.

3. The PNA chip of claim 1, wherein the epoxy group-containing polymer is a copolymer of an epoxy group-containing acrylate monomer and an epoxy group-free acrylate monomer.

4. The PNA chip of claim 3, wherein the epoxy group-containing polymer is a copolymer of an epoxy group-containing acrylate monomer and a highly viscous acrylate monomer, as represented by Formula 1 below:

—

[CR³R³—

CR¹R³—

X]_n-, 

 

(1)

wherein R¹ is an epoxy-containing ester, R³ is hydrogen or an alkyl group, and X is a highly viscous acrylate compound.

5. The PNA chip of claim 4, wherein the highly viscous acrylate monomer is selected from the group consisting of dipentaerythrithol hydroxy pentaacrylate (DPHA), 9-ethyleneglycol diacrylate (9-EGDA), pentaerythritol tri,tetraacrylate (PETA), polyethyleneglycol 400 diacrylate, tripropyleneglycol diacrylate, trimethylol propane triacrylate, and dipentaerythritol hexacrylate.

6. The PNA chip of claim 3, wherein the epoxy group-containing polymer is a copolymer of an epoxy group-containing acrylate monomer and an acrylate derivative capable of adhering to the plastic substrate, as represented by Formula 2 below:

—

[CR³R³—

CR¹R³—

CR³R³—

CR³R³]_n-, 

 

(2)

wherein R¹ is an epoxy-containing ester, R² is an alkylester, and R³ is hydrogen or an alkyl group.

7. The PNA chip of claim 6, wherein the acrylate derivative capable of adhering to the plastic substrate is selected from the group consisting of methylmethacrylate (MMA), ethylacrylate, ethylmethacrylate (EMA), n-propylacrylate, n-propylmethacrylate, isopropylacrylate, and isopropylmethacrylate.

8. The PNA chip of claim 1, wherein the content of the epoxy group in the epoxy group-containing polymer is 20-30%.

9. The PNA chip of claim 1, further comprising an ether-containing or ether-free carboxylic acid linker of 5-8 carbon atoms with an amino functional group that is connected to amino terminals of the probe PNAs.

10. A method of determining the genotypes of mycobacterial species, the method comprising:

a) applying a reaction sample containing target DNAs to the PNA chip of claim 1;

b) hybridizing the target DNAs with the probe PNAs;

c) washing the PNA chip to remove a nonspecific reaction product; and

d) detecting a fluorescent signal emitted from the resultant PNA/DNA hybrids.

11. The method of claim 10, wherein the target DNAs are obtained by PCR amplification using primers having DNA sequences of SEQ ID NOs:

1-4.

12. The method of claim 11, wherein the primers are biotin- or rhodamine-labeled primers.