Polynucleotide sequence assay

Chemistry: molecular biology and microbiology – Measuring or testing process involving enzymes or... – Involving nucleic acid

Reexamination Certificate

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C536S023100, C536S024300

Reexamination Certificate

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06511810

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to methods for detecting or quantifying one or more polynucleotide sequences in one or more samples, and to reagents and kits for use therein.
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INTRODUCTION
Methods for detection and analysis of target nucleic acids have found wide utility in basic research, clinical diagnostics, forensics, and other areas. One important use is in the area of genetic polymorphism. Genetic polymorphisms generally concern the genetic sequence variations that exist among homologous loci from different members of a species. Genetic polymorphisms can arise through the mutation of genetic loci by a variety of processes, such as errors in DNA replication or repair, genetic recombination, spontaneous mutations, transpositions, etc. Such mutations can result in single or multiple base substitutions, deletions, or insertions, as well as transpositions, duplications, etc.
Single base substitutions (transitions and transversions) within gene sequences can cause missense mutations and nonsense mutations. In missense mutations, an amino acid residue is replaced by a different amino acid residue, whereas in nonsense mutations, stop codons are created that lead to truncated polypeptide products. Mutations that occur within signal sequences, e.g., for directing exon/intron splicing of mRNAs, can produce defective splice variants with dramatically altered protein sequences. Deletions, insertions, and other mutations can also cause frameshifts in which contiguous residues encoded downstream of the mutation are replaced with entirely different amino acid residues. Mutations outside of exons can interfere with gene expression and other processes.
Genetic mutations underlie many disease states and disorders. Some diseases have been traced directly to single point mutations in genomic sequences (e.g., the A to T mutation associated with sickle cell anemia), while others have been correlated with large numbers of different possible polymorphisms located in the same or different genetic loci (e.g., cystic fibrosis). Mutations within the same genetic locus can produce different diseases (e.g., hemoglobinopathies). In other cases, the presence of a mutation may indicate susceptibility to particular condition for a disease but is insufficient to reliably predict the occurrence of the disease with certainty. Most known mutations have been localized to gene-coding sequences, splice signals, and regulatory sequences. However, it is expected that mutations in other types of sequences can also lead to deleterious, or sometimes beneficial, effects.
The large number of potential genetic polymorphisms poses a significant challenge to the development of methods for identifying and characterizing nucleic acid samples and for diagnosing and predicting disease. In other applications, it is desirable to detect the presence of pathogens or exogenous nucleic acids and to detect or quantify RNA transcipt levels.
In light of the increasing amount of sequence data that is becoming available for various organisms, and particularly for higher organisms such as humans, there is a need for rapid and convenient methods for determining the presence or absence of target mutations. Ideally, such a method should have high sensitivity, accuracy, and reproducibility. Also, the method should allow simultaneous detection of multiple target sequences in a single reaction mixture.
SUMMARY OF THE INVENTION
In one aspect, the invention includes a method for detecting a target polynucleotide sequence. In the method, a target polynucleotide strand region and a target-complementary strand region are reacted with a first probe pair and a second probe pair under conditions effective for the first probe pair to hybridize to the first and second regions in the target strand region, forming a first hybridization complex, and for the second probe pair to hybridize to the first and second regions in the target-complementary strand region, forming a second hybridization complex. In one embodiment, the first probe pair comprises (i) a first polynucleotide probe containing a sequence that is complementary to a first target region in the target strand region and (ii) a second polynucleotide probe comprising a sequence that is complementary to a second target region in the target strand region, wherein the second region is located 5′ to the first region and overlaps the first region by at least one nucleotide base, and the second probe pair may comprise (i) a third polynucleotide probe contain

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