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Direct repeat region 3' end modifications regulate Cas12a activity and expand its applications.

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Researchers discovered a method to control CRISPR-Cas12a activity by modifying its direct repeat region. This breakthrough enhances Cas12a functionality for diverse applications, including sensitive clinical diagnostics.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • CRISPR Technology

Background:

  • CRISPR-Cas12a is a powerful gene-editing tool with expanding applications.
  • Enhancing CRISPR-Cas12a's inherent functionalities is crucial for meeting diverse technological demands.

Purpose of the Study:

  • To investigate a novel regulatory mechanism for LbCas12a activity.
  • To explore the impact of direct repeat (DR) region 3' end modifications on Cas12a's cleavage activities.

Main Methods:

  • Systematic modification of the DR 3' end of LbCas12a with various substances (e.g., phosphorylation, DNA, photo-cleavable linkers).
  • Assessing the effects of these modifications on both cis- and trans-cleavage activities.
  • Evaluating the reactivation of temporarily inhibited Cas12a using specific de-modification agents.

Main Results:

  • DR 3' end modifications can reversibly regulate LbCas12a's cleavage functions.
  • Specific substances like alkaline phosphatase (ALP), immunoglobulin G (IgG), alpha-fetoprotein (AFP), and DNA-modifying enzymes can reactivate inhibited Cas12a.
  • Demonstrated successful clinical applications in detecting ALP, AFP, and Epstein-Barr virus with high sensitivity.

Conclusions:

  • Direct modification and de-modification of the DR region offer a versatile strategy for controlling LbCas12a activity.
  • This regulatory mechanism significantly broadens the scope of Cas12a applications, particularly in clinical diagnostics.
  • The findings pave the way for developing universal CRISPR-based diagnostic platforms.