Method for detecting radiation exposure
First Claim
1. A method of identifying cells that have been exposed to radiation induced biological stress, comprising:
- exposing a probe set comprising nucleic acid molecules representing genes that are differentially expressed in cells that have been exposed to an amount of ionizing radiation sufficient to cause differential expression of genes in the cell to a labeled nucleic acid composition from a test cell which specifically hybridizes to members of the probe set when the test cell has been exposed to an amount of ionizing radiation sufficient to cause differential expression of stress genes in the test cell, wherein at least one nucleic acid molecule of the probe set comprises SEQ ID NO;
14; and
determining whether the probe set hybridizes to the nucleic acid composition.
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Abstract
A method is disclosed for detecting exposure of organisms to biologically significant or hazardous amounts of ionizing radiation. The method uses nucleic acid microarray hybridization to evaluate biological effects, such as patterns of expression of genes after radiation exposure. Numerous genes are provided which have been found to be responsive to radiation exposure in a variety of cell lines. These genes are incorporated into probe sets, which are exposed to a labeled nucleic acid composition from a test cell, such as cDNA reverse transcribed from mRNA in the test cell, which specifically hybridizes to members of the probe set when the cell has been exposed to a biologically significant amount of ionizing radiation. Whether the nucleic acid composition hybridizes to the nucleic acid molecules representing genes that are differentially expressed is determined. The invention also includes methods for determining a dose response relationship between radiation exposure and differential expression of one or more genes, for example to determine a probable radiation dose in cells that have actually or potentially been exposed to the ionizing radiation. The invention also includes probe sets and microarrays used in this method.
13 Citations
52 Claims
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1. A method of identifying cells that have been exposed to radiation induced biological stress, comprising:
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exposing a probe set comprising nucleic acid molecules representing genes that are differentially expressed in cells that have been exposed to an amount of ionizing radiation sufficient to cause differential expression of genes in the cell to a labeled nucleic acid composition from a test cell which specifically hybridizes to members of the probe set when the test cell has been exposed to an amount of ionizing radiation sufficient to cause differential expression of stress genes in the test cell, wherein at least one nucleic acid molecule of the probe set comprises SEQ ID NO;
14; anddetermining whether the probe set hybridizes to the nucleic acid composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 21, 22, 23, 24, 25, 26, 49, 50, 51)
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14. A method of identifying cells that have been exposed to radiation induced biological stress, comprising:
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providing a plurality of probe elements bound to a surface, each probe element comprising a nucleic acid that is differentially expressed by a cell following ionizing radiation induced biological stress, wherein at least one probe element comprises SEO ID NO;
14;contacting the plurality of probe elements with a plurality of test nucleic acid sequences obtained from a test cell, under conditions that allow the test nucleic acid sequences to specifically hybridize to one or more of the probe elements, and provide a signal which indicates differential expression of one or more genes if the cell has been exposed to an amount of ionizing radiation sufficient to cause differential expression of stress genes in the cell; and detecting the presence or absence of the signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method of making a microarray for identifying cells that have actually or potentially been exposed to an amount of ionizing radiation sufficient to cause differential expression of stress genes in the cell, comprising:
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identifying genes that are differentially expressed by a cell following exposure to the ionizing radiation; and providing a plurality of probe elements bound to a substrate surface, the probe elements comprising probe nucleic acids from genes that are identified as differentially expressed by a cell following ionizing radiation induced biological stress, wherein at least one probe element comprises SEQ ID NO;
14, and wherein the probe nucleic acid is capable of hybridizing to a nucleic acid differentially expressed by the cell following exposure of the cell to the ionizing radiation. - View Dependent Claims (36, 37, 38, 41)
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39. A method of diagnosing ionizing radiation exposure in a subject, comprising:
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obtaining a biological sample from the subject; synthesizing cDNA from mRNA expressed in one or more cells of the biological sample, and labeling the cDNA with a detectable label; exposing the labeled cDNA to a probe set which represents genes that are differentially expressed in the biological sample following exposure to ionizing radiation, and determining if the labeled cDNA selectively hybridizes to one or more probes of the probe set that are associated with the radiation exposure, wherein the probe set comprises SEQ ID NO;
14. - View Dependent Claims (40, 42, 52)
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43. A method for measuring a biological response to in a subject comprising:
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obtaining a biological sample from the subject; synthesizing cDNA from mRNA expressed in one or more cells of the biological sample; labeling the cDNA with a detectable label; exposing the labeled cDNA to a probe set comprising nucleic acid molecules representing genes that are differentially expressed in cells that have been exposed to an amount of ionizing radiation sufficient to cause differential expression of genes in the cell, wherein at least one nucleic acid molecule of the probe set comprises SEQ ID NO;
14; anddetermining if the labeled cDNA selectively hybridizes to one or more probes of the probe set differentially expressed following exposure to ionizing radiation. - View Dependent Claims (44, 45, 46, 47, 48)
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Specification