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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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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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Cas12a-based one-pot SNP detection with high accuracy.

Hong-Xia Zhang1, Caixiang Zhang1, Shuhan Lu1,2

  • 1Department of Rheumatology and Immunology, Medical Research Institute, Frontier Science Center for Immunology and Metabolism, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan, China.

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|May 16, 2023
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Summary
This summary is machine-generated.

Researchers developed sensitive Cas12a (seCas12a) for highly accurate single nucleotide polymorphism (SNP) detection. This CRISPR-based system achieves 100% accuracy in clinical samples within 30 minutes.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Genetics

Background:

  • CRISPR-Cas12a systems are used for nucleic acid detection but lack sensitivity for single nucleotide polymorphism (SNP) discrimination.
  • This limitation restricts their application in diagnostics and genetic analysis.

Purpose of the Study:

  • To engineer a CRISPR-Cas12a variant with enhanced sensitivity for accurate SNP detection.
  • To develop a versatile one-pot system for rapid and specific SNP identification.

Main Methods:

  • Engineered a LbCas12a variant, termed seCas12a (sensitive Cas12a), with improved SNP sensitivity.
  • Developed a one-pot detection system utilizing seCas12a and truncated crRNA for enhanced specificity.
  • Investigated the mechanism of cis-cleavage activity for optimal signal-to-noise ratio.

Main Results:

  • The seCas12a system demonstrated high versatility, accepting both canonical and non-canonical PAM sequences.
  • It effectively distinguished SNPs located between positions 1 to 17, with specificity enhanced by truncated crRNA.
  • Optimized cis-cleavage levels (0.01 min⁻¹ to 0.0006 min⁻¹) were identified for achieving a good signal-to-noise ratio.
  • The system successfully detected pharmacogenomic SNPs in human clinical samples with 100% accuracy in 30 minutes.

Conclusions:

  • The seCas12a-based one-pot system offers a sensitive, specific, and versatile platform for SNP detection.
  • This technology shows significant potential for rapid genetic analysis and clinical diagnostics, particularly for pharmacogenomic applications.