Mismatch endonuclease and its use in identifying mutations in targeted polynucleotide strands
First Claim
1. A method for determining a mutation in a target sequence of a single stranded polynucleotide with reference to a non-mutated sequence of a polynucleotide that is hybridizable with the polynucleotide including said target sequence, wherein said polynucleotides are amplified, labeled with a detectable marker, hybridized to one another, subjected to the activity of an endonuclease and analyzed for the presence of said mutation, the improvement comprising the use of a mismatch endonuclease enzyme of plant origin, the activity of said enzyme comprising:
- a) detection of all mismatches whether known or unknown between said hybridized polynucleotides, said detection occurring over a pH range of 5-9, said enzyme exhibiting substantial activity over the entire pH range;
b) catalytic formation of a substantially single-stranded nick at a target sequence containing a mismatch; and
c) recognition of a mutation in a target polynucleotide sequence, said recognition being substantially unaffected by flanking polynucleotide sequences.
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Accused Products
Abstract
An endonuclease and its method of use for the detection of mutations in targeted polynucleotide sequences are provided, which facilitate the localization and identification of mutations, mismatches and genetic polymorphisms.
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Citations
17 Claims
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1. A method for determining a mutation in a target sequence of a single stranded polynucleotide with reference to a non-mutated sequence of a polynucleotide that is hybridizable with the polynucleotide including said target sequence, wherein said polynucleotides are amplified, labeled with a detectable marker, hybridized to one another, subjected to the activity of an endonuclease and analyzed for the presence of said mutation, the improvement comprising the use of a mismatch endonuclease enzyme of plant origin, the activity of said enzyme comprising:
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a) detection of all mismatches whether known or unknown between said hybridized polynucleotides, said detection occurring over a pH range of 5-9, said enzyme exhibiting substantial activity over the entire pH range; b) catalytic formation of a substantially single-stranded nick at a target sequence containing a mismatch; and c) recognition of a mutation in a target polynucleotide sequence, said recognition being substantially unaffected by flanking polynucleotide sequences. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13)
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11. A method for determining a mutation in a target sequence of single stranded polynucleotide with reference to a non-mutated sequence of a polynucleotide that is hybridizable with the polynucleotide including said target sequence, wherein said polynucleotides are amplified, labeled with a detectable marker, hybridized to one another, exposed to endonuclease and analyzed for the presence of said mutation, the improvement comprising the use of a mismatch endonuclease enzyme from celery, the activity of said enzyme comprising:
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a) detection of all mismatches whether known or unknown between said hybridized polynucleotides, said detection occurring over a pH range of 5-9, said enzyme exhibiting substantial activity over the entire pH range; b) catalytic formation of a substantially single-stranded nick at a target sequence containing a mismatch; c) recognition of a mutation in a target polynucleotide said recognition being substantially unaffected by flanking polynucleotide sequences; and d) recognition of polynucleotide loops and insertions between said hybridized polynucleotides.
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14. A mismatch endonuclease enzyme for determining a mutation in a target sequence of single stranded mammalian polynucleotide with reference to a non-mutated sequence in a polynucleotide that is hybridizable with the polynucleotide including said target sequence, said enzyme being isolated from a plant source and effective to:
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a) detect all mismatches, whether known or unknown between said hybridized polynucleotides, said detection occurring over a pH range of 5-9, said enzyme exhibiting substantial activity over the entire pH range; b) recognize polynucleotide loops and insertions in said hybridized polynucleotides; c) catalyze formation of a substantially single-stranded nick at the DNA site containing a mismatch; d) recognize a mutation in a target polynucleotide sequence, said recognition being substantially unaffected by flanking DNA sequences. - View Dependent Claims (15, 16, 17)
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Specification