Methods and compositions for the detection of sequences in selected DNA molecules
First Claim
1. A method for detecting the presence or absence of a target DNA sequence within an identified region of a selected DNA molecule, wherein when the target is present in the region, it has an expected location and configuration therein, the method comprising the steps of:
- (a) obtaining a nucleic acid primer molecule having a template binding region that is capable of hybridizing to a first strand of the selected DNA molecule at a binding position 3'"'"' of and adjacent to the expected location of such a target sequence within the DNA molecule, said template binding region of the primer molecule being capable of binding to said DNA molecule when the target sequence is present or absent, the primer molecule further including at its 3'"'"' terminus and adjacent the template binding region a target sequence complementary region comprised of at least one nucleotide complementary to a corresponding nucleotide of the target sequence, said primer being capable of priming polymerase chain extension when said target sequence is present on said DNA molecule, yet incapable of priming polymerase chain extension when the target sequence is absent; and
(b) determining the ability of the primer molecule to prime the polymerase chain extension using the selected DNA molecule as a template, to detect the presence or absence of the target sequence within the selected DNA molecule.
4 Assignments
0 Petitions
Accused Products
Abstract
The present disclosure relates to novel procedures and primers for use in conenction with PCR or in vitro DNA sequence amplification to detect sequence variants, such as sequence modifications or mutations. The invention will have particular applicability in the detection of point or other relatively short mutations where the expected location or configuration of the mutation is known. Primers of the invention incorporate a 3'"'"' terminal nucleotide or nucleotides complementary to the sequence variance, and thereby serve to successfuly prime chain elongation only on DNA templates which include the particular variant. Exemplary mutations suitable for detection through practice of the invention include those involved in beta-thalassemia, sickle cell anemia, hemoglobin C disease, diabetes, acute intermittent porphyria, lung, breast, and colon cancers and others.
-
Citations
22 Claims
-
1. A method for detecting the presence or absence of a target DNA sequence within an identified region of a selected DNA molecule, wherein when the target is present in the region, it has an expected location and configuration therein, the method comprising the steps of:
-
(a) obtaining a nucleic acid primer molecule having a template binding region that is capable of hybridizing to a first strand of the selected DNA molecule at a binding position 3'"'"' of and adjacent to the expected location of such a target sequence within the DNA molecule, said template binding region of the primer molecule being capable of binding to said DNA molecule when the target sequence is present or absent, the primer molecule further including at its 3'"'"' terminus and adjacent the template binding region a target sequence complementary region comprised of at least one nucleotide complementary to a corresponding nucleotide of the target sequence, said primer being capable of priming polymerase chain extension when said target sequence is present on said DNA molecule, yet incapable of priming polymerase chain extension when the target sequence is absent; and (b) determining the ability of the primer molecule to prime the polymerase chain extension using the selected DNA molecule as a template, to detect the presence or absence of the target sequence within the selected DNA molecule. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A method for detecting the presence or absence of a point mutation within a selected gene of a selected DNA molecule, wherein when said point mutation is present in the gene, it has an expected location and configuration therein, the method comprising the steps of:
-
(a) obtaining a nucleic acid primer molecule having a template binding region that is capable of hybridizing to a first strand of the selected DNA molecule at a binding position 3'"'"' of and adjacent to the expected location of the point mutation, said template binding region of the primer molecule being capable of binding to said DNA molecule when the point mutation is either present or absent, the primer molecule further including at its 3'"'"' terminus and adjacent the template binding region a nucleotide that is complementary to the point mutation, said primer being capable of priming polymerase chain extension when said point mutation is present on said DNA molecule, yet incapable of priming polymerase chain extension when the point mutation is absent; and (b) determining the ability of the primer molecule to prime polymerase chain extension using the selected DNA molecule as a template, to detect the presence or absence of the point mutation within the selected DNA molecule. - View Dependent Claims (18, 19)
-
- 20. A nucleic acid primer molecule for use in connection with polymerase chain extension for detecting the presence or absence of a target DNA sequence that has an expected location and configuration within an identified region of a selected DNA molecule, the nucleic acid primer molecule having a template binding region that is capable of hybridizing to a first strand of the selected DNA molecule at a binding position 3'"'"' of and adjacent to the expected location of such a target sequence within the DNA molecule, the primer molecule further including at its 3'"'"' terminus and adjacent the template binding region at target sequence complementary region comprised of at least one nucleotide complementary to a corresponding nucleotide of the target sequence.
Specification