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Related Concept Videos

Single Nucleotide Polymorphisms-SNPs01:05

Single Nucleotide Polymorphisms-SNPs

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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Digital PCR Discriminates between SARS-CoV-2 Omicron Variants and Immune Escape Mutations.

Steven C Holland1, LaRinda A Holland1, Matthew F Smith1

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Summary

Digital PCR (dPCR) assays can identify SARS-CoV-2 mutations, aiding personalized treatment. This study demonstrates dPCR

Keywords:
SARS-CoV-2clinical diagnosticsdigital PCRimmune escape mutationsmonoclonal antibody

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Area of Science:

  • Virology
  • Molecular Diagnostics
  • Genomics

Background:

  • Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) evolves, leading to immune evasion and therapeutic resistance.
  • Accurate identification of viral mutations is crucial for guiding personalized patient treatment plans.
  • Digital PCR (dPCR) offers a rapid and reliable method for detecting single nucleotide polymorphisms (SNPs).

Purpose of the Study:

  • To develop and validate a panel of SARS-CoV-2 dPCR assays.
  • To demonstrate the application of these assays for variant lineage typing and detecting mutations associated with therapeutic resistance.
  • To assess the utility of dPCR as a personalized diagnostic tool for guiding patient treatment.

Main Methods:

  • Designed multiplexed dPCR assays targeting SNPs in the orf1ab gene to differentiate SARS-CoV-2 Delta, Omicron BA.1, and BA.2 lineages.
  • Developed dPCR assays for key spike mutations (R346T, K444T, N460K, F486V, F486S) linked to immune evasion and reduced monoclonal antibody efficacy.
  • Validated assays on clinical saliva specimens using Illumina whole-genome sequencing for verification.

Main Results:

  • Successfully differentiated Delta, Omicron BA.1, and BA.2 lineages using dPCR assays on 596 clinical specimens.
  • Identified specific mutations in Omicron subvariants (BA.2.75.2, BM.1.1, BN.1, BF.7, BQ.1, BQ.1.1, XBB) using dPCR on 81 clinical specimens.
  • Demonstrated the ability to multiplex assays to detect up to 4 SNPs simultaneously.

Conclusions:

  • Digital PCR assays are effective for typing SARS-CoV-2 variant lineages and detecting mutations conferring therapeutic resistance.
  • dPCR serves as a valuable complement to whole-genome sequencing for rapid viral genotyping.
  • These findings support the use of dPCR as a personalized diagnostic tool to inform SARS-CoV-2 treatment decisions.