Isolation of living cells and preparation of cell lines based on detection and quantification of preselected cellular ribonucleic acid sequences
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Abstract
The invention is directed to reliable and efficient detection of mRNAs as well as other RNAs in living cells and its use to identify and, if desired, separate cells based on their desired characteristics. Such methods greatly simplify and reduce the time necessary to carry out previously-known procedures, and offers new approaches as well, such as selecting cells that generate a particular protein or antisense oligonucleotide, generating cell lines that express multiple proteins, generating cell lines with knock-out of one or more protein, and others.
25 Citations
106 Claims
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1-21. -21. (canceled)
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22. A method for quantifying the level of at least one RNA transcript expression in a biological sample comprising the steps of:
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a) exposing said biological sample to a first molecular beacon which fluoresces upon hybridization with said RNA transcript, wherein said molecular beacon comprises nucleotides that are complementary to the RNA and nucleotides that are mutually complementary;
b) quantitating the level of fluorescence in said biological sample; and
c) correlating said level of fluorescence with said level of said at least one mRNA transcript. - View Dependent Claims (23, 24, 25, 26, 27, 28, 104)
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29-39. -39. (canceled)
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40. A method for identifying genetic recombinational events in living cells comprising the steps of:
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a) exposing a cell to a molecular beacon that fluoresces upon hybridization with a RNA sequence selected from the group consisting of that transcribed from a recombined sequence and that transcribed from the nonrecombined sequence;
b) detecting said cell expressing said RNA sequence. - View Dependent Claims (106)
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41-43. -43. (canceled)
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44. A method for isolating cells expressing at least one RNA, comprising the steps of:
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a) introducing into cells DNA encoding said at least one RNA;
b) exposing said cells to at least one molecular beacon that fluoresces upon hybridization to said at least one RNA, wherein said molecular beacon comprises nucleotides that are complementary to the RNA and nucleotides that are mutually complementary; and
c) isolating said cells that fluoresce. - View Dependent Claims (45, 46, 47, 68, 84, 85, 86, 87, 88, 89, 90, 91, 92, 96, 97, 98)
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48. A method for isolating cells that express at least one of two or more RNAs, comprising the steps of:
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a) introducing into cells a first DNA encoding a first RNA;
b) introducing into said cells a second DNA encoding at least a second RNA;
c) exposing said cells to a first molecular beacon that fluoresces upon hybridization to said first RNA, wherein said molecular beacon comprises nucleotides that are complementary to the first RNA and nucleotides that are mutually complementary;
d) exposing said cells to at least a second molecular beacon that fluoresces upon hybridization to said at least second RNA, wherein said molecular beacon comprises nucleotides that are complementary to the second RNA and nucleotides that are mutually complementary; and
e) isolating cells that exhibit fluorescence upon hybridization of at least one of said molecular beacons to their respective RNA. - View Dependent Claims (49, 50, 51, 74, 76, 81, 93)
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52. A method for isolating cells expressing at least one RNA, comprising the steps of:
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a) introducing into cells DNA encoding said at least one RNA and at least one tag sequence;
b) exposing said cells to at least one molecular beacon that fluoresces upon hybridization with the RNA transcript of said tag sequence, wherein said molecular beacon comprises nucleotides that are complementary to the RNA transcript of the tag sequence and nucleotides that are mutually complementary; and
c) isolating said cells that fluoresce. - View Dependent Claims (53, 54, 55, 70, 71, 72, 73)
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56. A method for isolating cells expressing at least one of two or more RNAs, comprising the steps of:
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a) introducing into cells a first DNA encoding a first RNA and at least a first tag sequence;
b) introducing into said cells a second DNA encoding at least a second RNA and at least a second tag sequence;
c) exposing said cells to at least a first molecular beacon that fluoresces upon hybridization with the first tag sequence, wherein said molecular beacon comprises nucleotides that are complementary to the RNA transcript of the first tag sequence and nucleotides that are mutually complementary;
d) exposing said cells to at least a second molecular beacon that fluoresces upon hybridization with the second tag sequence, wherein said molecular beacon comprises nucleotides that are complementary to the RNA transcript of said second tag sequence and nucleotides that are mutually complementary; and
e) isolating cells that exhibit fluorescence upon hybridization of at least one of said molecular beacons to their respective RNA transcripts of said tag sequences. - View Dependent Claims (57, 58, 59, 69)
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60. A method of isolating cells expressing at least one of two or more sets of plurality of RNA, comprising the steps of:
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a) introducing into cells a first set of plurality of DNAs encoding at least a first set of plurality of RNAs and at least a first tag sequence;
b) introducing into cells a second set of plurality of DNAs encoding at least a second set of plurality of RNAs and at least a second tag sequence;
c) exposing said cells to at least a first molecular beacon that fluoresces upon hybridization to the RNA transcript of said at least first tag sequence, wherein said molecular beacon comprises nucleotides that are complementary to the RNA transcript of the first tag sequence and nucleotides that are mutually complementary;
d) exposing said cells to at least a second molecular beacon that fluoresces upon hybridization to the RNA transcript of said at least second tag sequence, wherein said molecular beacon comprises nucleotides that are complementary to the RNA transcript of the second tag sequence and nucleotides that are mutually complementary; and
e) isolating said cells that exhibit fluorescence upon hybridization of at least one of said molecular beacons to their respective RNA transcripts of said tag sequences. - View Dependent Claims (61, 77, 82, 94)
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62. A method of isolating cells that overexpress at least one RNA comprising the steps of:
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a) introducing into cells at least a first DNA encoding said at least one RNA and at least a first tag sequence; and
at least a second DNA encoding said at least one RNA and at least a second tag sequence;
wherein said first tag sequence is different from said second tag sequence;
b) exposing said cells to at least a first molecular beacon that fluoresces upon hybridization with the RNA transcript of said at least first tag sequence, wherein said molecular beacon comprises nucleotides that are complementary to the RNA transcript of the first tag sequence and nucleotides that are mutually complementary;
c) exposing said cells to at least a second molecular beacon that fluoresces upon hybridization with the RNA transcript of said at least second tag sequence, wherein said molecular beacon comprises nucleotides that are complementary to the RNA transcript of the second tag sequence and nucleotides that are mutually complementary; and
d) isolating cells that fluoresce upon hybridization of at least one of said molecular beacons to their respective RNA transcripts of said tag sequences. - View Dependent Claims (63, 78)
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64. A method for isolating cells that overexpress at least a first protein and which are functionally null expressing for at least a second protein, comprising the steps of:
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a) introducing into cells at least a first DNA encoding at least one RNA that encodes said at least first protein, and at least a first tag sequence; and
at least a second DNA encoding said at least one RNA and at least a second tag sequence, wherein said first and second tag sequences are different;
b) introducing into cells at least a third DNA encoding at least one antisense RNA that binds to the mRNA transcript of said at least second protein;
c) exposing said cells to at least a first molecular beacon that fluoresces upon hybridization with the RNA transcript of said at least first tag sequence, wherein said molecular beacon comprises nucleotides that are complementary to the RNA transcript of the first tag sequence and nucleotides that are mutually complementary;
d) exposing said cells to at least a second molecular beacon that fluoresces upon hybridization with the RNA transcript of said at least second tag sequence, wherein said molecular beacon comprises nucleotides that are complementary to the RNA transcript of the second tag sequence and nucleotides that are mutually complementary;
e) exposing said cells to at least a third molecular beacon that fluoresces upon hybridization to said at least one antisense RNA, wherein said molecular beacon comprises nucleotides that are complementary to the antisense RNA and nucleotides that are mutually complementary; and
e) isolating cells that fluoresce upon hybridization of said molecular beacons to their respective RNAs. - View Dependent Claims (65, 75, 79, 83)
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66. A method for isolating cells expressing at least one exogenous RNA and one endogenous RNA, comprising the steps of:
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a) introducing into cells DNA encoding said at least one exogenous RNA and optionally, a tag sequence, wherein said cells potentially express at least one endogenous RNA;
b) exposing said cells to at least a first molecular beacon that fluoresces upon hybridization to said at least one exogenous RNA or RNA transcript of said tag sequence, wherein said molecular beacon comprises nucleotides that are complementary to the exogenous RNA or RNA transcript of said tag sequence and nucleotides that are mutually complementary;
c) exposing said cells to at least a second molecular beacon that fluoresces upon hybridization to said at least one endogenous RNA, wherein said molecular beacon comprises nucleotides that are complementary to the endogenous RNA and nucleotides that are mutually complementary; and
c) isolating said cells that fluoresce upon hybridization of said molecular beacons to their respective RNAs. - View Dependent Claims (67, 80, 95)
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99. A proteolytic activity generating unitary hybridization probe comprising:
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a single-stranded target complement sequence being complementary to the target sequence;
flanking the target complement sequence, a pair of oligonucleotide arms consisting of a 5′
arm sequence covalently linked to said 5′
terminus and a 3′
arm sequence covalently linked to said 3′
terminus, said pair of oligonucleotide arms forming a stem duplex,an interacting pair comprising a proteolytic enzyme and an inhibitor of said proteolytic enzyme, one member of each pair conjugated to the 5′
arm sequence and the other member conjugated to the 3′
arm sequence, wherein said inhibitor is capable of inactivating the proteolytic activity of said proteolytic enzyme when interacting therewith.100. The probe of claim 99 having, under assay conditions in the absence of said target sequence, a characteristic proteolytic activity whose level is a function of the degree of interaction of said proteolytic enzyme and said inhibitor, wherein under conditions in the presence of an excess of said target sequence, hybridization of the target complement sequence to the target sequence increases the level of said characteristic proteolytic activity.
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101. The probe of claim 100, wherein the assay conditions have a detection temperature for detecting the target sequence.
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102. The probe of claim 100, wherein said proteolytic enzyme inhibitor is a peptide.
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103. The probe of claim 100, wherein said proteolytic enzyme and said inhibitor of said proteolytic enzyme is selected from the group consisting of aminopeptidase and amastatin, trypsin-like cysteine proteases and antipain, aminopeptidase and bestatin, chymotrypsin like cysteine proteases and chymostatin, aminopeptidase and diprotin A or B, carboxypeptidase A and EDTA, elastase-like serine proteases and elastinal, and thermolysin or aminopeptidase M and 1,10-phenanthroline.
Specification