In one aspect, the invention features a combination of oligonucleotides comprising a forward primer oligonucleotide and a blocking oligonucleotide. The forward primer oligonucleotide has a 3′ end region, where the 3′ end region includes a portion complementary to a mutation positioned in a region within a polynucleotide. The blocking oligonucleotide contains a blocking moiety and has a 5′ end region, where the 5′ end region includes a portion complementary to a wild-type sequence of the region corresponding to the position of the mutation. In other aspects, the invention provides kits including the combination of primer oligonucleotides and methods of using the oligonucleotides to detect a mutation in a polynucleotide.

In one aspect, the invention features a combination of oligonucleotides comprising a forward primer oligonucleotide and a blocking oligonucleotide. The forward primer oligonucleotide has a 3′ end region, where the 3′ end region includes a portion complementary to a mutation positioned in a region within a polynucleotide. The blocking oligonucleotide contains a blocking moiety and has a 5′ end region, where the 5′ end region includes a portion complementary to a wild-type sequence of the region corresponding to the position of the mutation. In other aspects, the invention provides kits including the combination of primer oligonucleotides and methods of using the oligonucleotides to detect a mutation in a polynucleotide.

Methods and kits are provided for nucleic acid analysis. In an illustrative method, Snapback-ARMS primers are used to amplify preferentially a target nucleic acid that is present in a low allele fraction. In another embodiment, tailed primers are used to identify the preferentially amplified allele.

Methods and kits are provided for nucleic acid analysis. In an illustrative method, Snapback-ARMS primers are used to amplify preferentially a target nucleic acid that is present in a low allele fraction. In another embodiment, tailed primers are used to identify the preferentially amplified allele.

The invention relates to methods of detecting a target nucleic acid having a variant sequence in a pool of nucleic acid comprising non-variant nucleic acid and/or non-targeted variant nucleic acid, and a method of highly specific PCR, together with associated primers, primers pairs, compositions, kits and uses.

This invention relates to methods and compositions for assessing an amount of cancer-specific nucleic acids in a sample, such as from a subject. The methods and compositions provided herein can be used to determine risk of a condition, such as cancer, in a subject.

This invention relates to methods and compositions for assessing an amount of cancer-specific nucleic acids in a sample, such as from a subject. The methods and compositions provided herein can be used to determine risk of a condition, such as cancer, in a subject.

In one aspect, the invention features a combination of oligonucleotides comprising a forward primer oligonucleotide and a blocking oligonucleotide. The forward primer oligonucleotide has a 3 end region, where the 3 end region includes a portion complementary to a mutation positioned in a region within a polynucleotide. The blocking oligonucleotide contains a blocking moiety and has a 5 end region, where the 5 end region includes a portion complementary to a wild-type sequence of the region corresponding to the position of the mutation. In other aspects, the invention provides kits including the combination of primer oligonucleotides and methods of using the oligonucleotides to detect a mutation in a polynucleotide.

In one aspect, the invention features a combination of oligonucleotides comprising a forward primer oligonucleotide and a blocking oligonucleotide. The forward primer oligonucleotide has a 3 end region, where the 3 end region includes a portion complementary to a mutation positioned in a region within a polynucleotide. The blocking oligonucleotide contains a blocking moiety and has a 5 end region, where the 5 end region includes a portion complementary to a wild-type sequence of the region corresponding to the position of the mutation. In other aspects, the invention provides kits including the combination of primer oligonucleotides and methods of using the oligonucleotides to detect a mutation in a polynucleotide.

This invention relates to methods and compositions for assessing an amount of non-native nucleic acids in a sample, such as from a pregnant subject with the non-native nucleic acids being fetal specific. The methods and compositions provided herein can be used to determine risk of a condition, such as a fetal condition, in a pregnant subject.