Process for labeling a ribonucleic acid, and labeled RNA fragments which are obtained thereby
First Claim
Patent Images
1. A process for labeling a synthetic or natural ribonucleic acid (RNA), comprising:
- fragmenting the RNA to produce a plurality of RNA fragments having freed terminal phosphates for further reaction, and labeling a plurality of said fragments at the terminal phosphates freed in the fragmentation step, located at the 3′
end and/or the 5′
end of said fragments.
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Abstract
The present invention relates to a process for labeling a synthetic or natural ribonucleic acid (RNA). It also relates to RNA fragments, which have been labeled by fragmenting the RNA to free a terminal phosphate of each fragment for further reaction, and labeling each fragment at the freed terminal phosphate which is located at the 3′ end and/or the 5′ end of each fragment of the RNA, and to the use of such RNA fragments, for example, in the field of medical diagnosis.
41 Citations
36 Claims
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1. A process for labeling a synthetic or natural ribonucleic acid (RNA), comprising:
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fragmenting the RNA to produce a plurality of RNA fragments having freed terminal phosphates for further reaction, and labeling a plurality of said fragments at the terminal phosphates freed in the fragmentation step, located at the 3′
end and/or the 5′
end of said fragments.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
a single nucleotide which is labeled at the freed terminal phosphate that is located at the 3′ - end or the 5′
end of the RNA fragment, and
at least one other nucleotide whose base (purine;
adenine/guanine or pyrimidine;
uracil/cytosine) is identical to that of the labeled nucleotide,wherein the fragment comprises from 10 to 100 nucleotides.
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11. An RNA fragment according to claim 10, wherein the RNA fragment comprises at least one thiophosphate nucleotide.
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12. An RNA fragment according to claim 11, wherein the labeled nucleotide is a thiophosphate nucleotide.
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13. An RNA fragment according to claim 10, wherein the fragment comprises from 30 to 70 nucleotides.
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14. An RNA fragment according to claim 10, wherein the fragment comprises from 40 to 60 nucleotides.
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15. The process according to claim 1, wherein the 3′
- end and/or the 5′
end of each fragment is labeled, except that the original 3′
end and the original 5′
end of the starting RNA are not labeled.
- end and/or the 5′
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16. The process of claim 7, wherein said metal cations are combined with a chemical catalyst.
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17. The process according to claim 16, wherein the metal cations are Mg++, Mn++, Cu++, Co++ and/or Zn++ ions and the chemical catalyst is an imidazole, a substituted analogue, or any chemical molecule that has an affinity for the RNA and that carries an imidazole nucleus or a substituted analogue.
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18. The process according to claim 17, wherein the chemical catalyst is N-methylimidazole.
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19. The process according to claim 9, wherein the agent for binding the label to the RNA is at least one member selected from the group consisting of hydroxyl, amine, hydrazine, alkoxylamine, alkyl halide, phenylmethyl halide, iodoacetamide and a maleimide grouping.
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20. A method for detecting at least one nucleic acid selected from the group consisting of a DNA, a DNA fragment, an RNA, and an RNA fragment, comprising:
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obtaining a sample containing said nucleic acid, and contacting said sample with an RNA fragment probe according to claim 13 to detect for said nucleic acid.
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21. A method for binding a capture probe with a labeled target, comprising:
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obtaining a sample containing said capture probe, and contacting said sample with a labeled RNA fragment according to claim 13, which is able to bind to said capture probe.
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22. A process for labeling a synthetic or natural ribonucleic acid (RNA), comprising:
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fragmenting the RNA to produce a plurality of RNA fragments having freed terminal phosphates for further reaction, and labeling with a label a plurality of said fragments at the terminal phosphates freed in the fragmentation step, located at the 3′
end and/or the 5′
end of said fragments, wherein the label is directly detectable.- View Dependent Claims (23, 24, 25, 34, 35, 36)
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26. A process for labeling a synthetic or natural ribonucleic acid (RNA), comprising:
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fragmenting the RNA to produce a plurality of RNA fragments having freed terminal phosphates for further reaction, and labeling with a label a plurality of said fragments at the terminal phosphates freed in the fragmentation step, located at the 3′
end and/or the 5′
end of said fragments, wherein the label is detectable by a physical, chemical or electrical characteristic of the label.- View Dependent Claims (27, 28, 29)
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30. A process for labeling a synthetic or natural ribonucleic acid (RNA), comprising:
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fragmenting the RNA to produce a plurality of RNA fragments having freed terminal phosphates for further reaction, and labeling a plurality of said fragments at said freed terminal phosphates located at the 3′
end and/or the 5′
end of the fragments,wherein the fragmentation and the labeling are effected in one step.
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31. A process for labeling a natural ribonucleic acid (RNA), comprising:
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fragmenting the natural RNA to produce a plurality of RNA fragments having freed terminal phosphates for further reaction, and labeling a plurality of said fragments at freed terminal phosphates located at the 3′
end and/or the 5′
end of said fragments.- View Dependent Claims (32)
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33. A process for labeling a synthetic or natural ribonucleic acid (RNA), comprising:
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non-specifically fragmenting the RNA to produce a plurality of RNA fragments having freed terminal phosphates for further reaction, and labeling a plurality of said fragments at freed terminal phosphates located at the 3′
end and/or the 5′
end of said fragments.
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Specification