In-situ hybridization method using RecA protein and RecA protein having marker or ligand for use in said method
First Claim
1. A method for detecting the presence of a double-stranded target nucleic acid sequence contained in fixed cells or cell structures, the method comprising the steps of:
- obtaining the fixed cells or cell structures by fixing cells or cell structures so as to allow a nucleic acid probe to enter;
forming a probe/labeled RecA complex in which a single-stranded probe and RecA protein having a detectable label or ligand are stably bound to each other, the single-stranded probe having a sequence complementary to the double-stranded target nucleic acid sequence;
adding the probe/labeled RecA complex to the fixed cells or cell structures under conditions in which the probe/labeled RecA complex can come in contact with the double-stranded target nucleic acid sequence;
allowing the probe/labeled RecA complex to react with the double-stranded target nucleic acid sequence so as to bind thereto under conditions where the double-stranded target nucleic acid sequence is not denatured;
removing the unreacted part of the probe/labeled RecA complex that has not been bound to the double-stranded target nucleic acid sequence; and
detecting the presence of the double-stranded target nucleic acid sequence by detecting the RecA protein having a detectable label or ligand included in the probe/labeled RecA complex bound to the double-stranded target nucleic acid.
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Abstract
A method for detecting the presence of a double-stranded target nucleic acid sequence contained in fixed cells or cell structures is provided. The method includes the steps of forming the fixed cells or cell structures by fixing cells or cell structures so as to allow a nucleic acid probe to enter, and forming a probe/RecA complex in which a single-stranded probe and RecA protein are stably bound to each other. The probe/RecA complex is allowed to react with the double-stranded target nucleic acid sequence to bind thereto under conditions in which the double-stranded target nucleic acid sequence is not denatured, and by detecting the RecA protein included in the probe/RecA complex, the presence of the double-stranded target nucleic acid sequence is detected.
The invention provides a diagnostic method by which the position of a specific gene or its regulatory region in a chromosome and the presence of a nucleic acid sequence derived from virus can be measured or visualized with high sensitivity and with ease.
25 Citations
34 Claims
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1. A method for detecting the presence of a double-stranded target nucleic acid sequence contained in fixed cells or cell structures, the method comprising the steps of:
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obtaining the fixed cells or cell structures by fixing cells or cell structures so as to allow a nucleic acid probe to enter; forming a probe/labeled RecA complex in which a single-stranded probe and RecA protein having a detectable label or ligand are stably bound to each other, the single-stranded probe having a sequence complementary to the double-stranded target nucleic acid sequence; adding the probe/labeled RecA complex to the fixed cells or cell structures under conditions in which the probe/labeled RecA complex can come in contact with the double-stranded target nucleic acid sequence; allowing the probe/labeled RecA complex to react with the double-stranded target nucleic acid sequence so as to bind thereto under conditions where the double-stranded target nucleic acid sequence is not denatured; removing the unreacted part of the probe/labeled RecA complex that has not been bound to the double-stranded target nucleic acid sequence; and detecting the presence of the double-stranded target nucleic acid sequence by detecting the RecA protein having a detectable label or ligand included in the probe/labeled RecA complex bound to the double-stranded target nucleic acid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 33, 34)
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14. A kit including RecA protein having a detectable label or ligand, for use in practicing a method for detecting the presence of a double-stranded target nucleic acid sequence contained in fixed cells or cell structures, the method comprising the steps of:
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obtaining the fixed cells or cell structures by fixing cells or cell structures so as to allow a nucleic acid probe to enter; forming a probe/labeled RecA complex in which a single stranded probe and RecA protein having a detectable label or ligand are stably bound to each other, the single-stranded probe having a sequence complementary to the double-stranded target nucleic acid sequence; adding the probe/labeled RecA complex to the fixed cells or cell structures under conditions in which the probe/labeled RecA complex can come in contact with the double-stranded target nucleic acid sequence; allowing the probe/labeled RecA complex to react with the double-stranded target nucleic acid sequence so as to bind thereto under conditions where the double-stranded target nucleic acid sequence is not denatured; removing the unreacted part of the probe/labeled RecA complex that has not been bound to the double-stranded target nucleic acid sequence; and detecting the presence of the double-stranded target nucleic acid sequence by detecting the RecA protein having a detectable label or ligand included in the probe/labeled RecA complex bound to the double-stranded target nucleic acid. - View Dependent Claims (15, 16, 17)
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18. A kit including probe/labeled RecA complex in which a probe and RecA protein having a detectable label or ligand are stably bound to each other, for use in practicing a method for detecting the presence of a double-stranded target nucleic acid sequence contained in fixed cells or cell structures, the method comprising the steps of:
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obtaining the fixed cells or cell structures by fixing cells or cell structures so as to allow a nucleic acid probe to enter; forming a probe/labeled RecA complex in which a single-stranded probe and RecA protein having a detectable label or ligand are stably bound to each other, the single-stranded probe having a sequence complementary to the double-stranded target nucleic acid sequence, adding the probe/labeled RecA complex to the fixed cells or cell structures under conditions in which the probe/labeled RecA complex can come in contact with the double stranded target nucleic acid sequence; allowing the probe/labeled RecA complex to react with the double-stranded target nucleic acid sequence so as to bind thereto under conditions where the double-stranded target nucleic acid sequence is not denatured; removing the unreacted part of the probe/labeled RecA complex that has not been bound to the double-stranded target nucleic acid sequence; and detecting the presence of the double-stranded target nucleic acid sequence by detecting the RecA protein having a detectable label or ligand included in the probe/labeled RecA complex bound to the double-stranded target nucleic acid. - View Dependent Claims (19, 20, 21)
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22. A kit including RecA protein and an anti-RecA antibody comprising:
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RecA protein and an anti-RecA antibody both having a detectable label or ligand, wherein the kit is used for practicing a method for detecting the presence of a double-stranded target nucleic acid sequence contained in fixed cells or cell structures, the method comprising the steps of; obtaining the fixed cells or cell structures by fixing cells or cell structures so as to allow a nucleic acid probe to enter; forming a probe/labeled RecA complex in which a single-stranded probe and RecA protein having a detectable label or ligand are stably bound to each other, the single-stranded probe having a sequence complementary to the double-stranded target nucleic acid sequence; adding the probe/labeled RecA complex to the fixed cells or cell structures under conditions in which the probe/labeled RecA complex can come in contact with the double-stranded target nucleic acid sequence; allowing the probe/labeled RecA complex to react with the double-stranded target nucleic acid sequence so as to bind thereto under conditions where the double-stranded target nucleic acid sequence is not denatured; removing the unreacted part of the probe/labeled RecA complex that has not been bound to the double-stranded target nucleic acid sequence; and detecting the presence of the double-stranded target nucleic acid sequence by detecting the RecA protein having a detectable label or ligand included in the probe/labeled RecA complex bound to the double-stranded target nucleic acid, wherein the step of detecting the presence of the double-stranded target nucleic acid sequence is performed by further using an anti-RecA antibody having a detectable label or ligand. - View Dependent Claims (23, 24, 25)
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26. A kit including a probe/labeled RecA complex comprising:
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RecA protein and an anti-RecA antibody both having a detectable label or ligand, wherein the RecA protein, having the detectable label or ligand, and a probe are stably bound to each other, for use in practicing a method for detecting the presence of a double-stranded target nucleic acid sequence contained in fixed cells or cell structures, the method comprising the steps of; obtaining the fixed cells or cell structures by fixing cells or cell structures so as to allow a nucleic acid probe to enter; forming a probe/labeled RecA complex in which a single-stranded probe and RecA protein having a detectable label or ligand are stably bound to each other, the single-stranded probe having a sequence complementary to the double-stranded target nucleic acid sequence; adding the probe/labeled RecA complex to the fixed cells or cell structures under conditions in which the probe/labeled RecA complex can come in contact with the double-stranded target nucleic acid sequence; allowing the probe/labeled RecA complex to react with the double-stranded target nucleic acid sequence so as to bind thereto under conditions where the double-stranded target nucleic acid sequence is not denatured; removing the unreacted part of the probe/labeled RecA complex that has not been bound to the double-stranded target nucleic acid sequence; and detecting the presence of the double-stranded target nucleic acid sequence by detecting the RecA protein having a detectable label or ligand included in the probe/labeled RecA complex bound to the double-stranded target nucleic acid, wherein the step of detecting the presence of the double-stranded target nucleic acid sequence is performed by further using anti-RecA antibody having a detectable label or ligand. - View Dependent Claims (27, 28, 29)
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30. RecA protein
having a label or ligand selected from the group consisting of an enzymatic label, biotin and digoxigenin.
Specification