Source 1primary paper2026MED
Toolkit/dual-single-guide RNA design
dual-single-guide RNA design
Also known as: dual-sgRNA design, dual-single-guide RNA strategy
Taxonomy: Mechanism Branch / Architecture. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
we introduce a dual-single-guide RNA design that places two cuts flanking the insertion site to create a geometry-matched strand-invasion window
Usefulness & Problems
Why this is useful
This design uses two sgRNAs to place Cas9 cuts on both sides of an intended insertion site, creating a geometry-matched window for strand invasion during HDR. The paper presents it as a practical design principle for more efficient precise knock-in editing.; improving CRISPR-Cas9 homology-directed repair-mediated integration; editing structurally constrained loci; C-terminal tagging; bidirectional promoter rewiring; long-distance dual-site mutagenesis
Source:
This design uses two sgRNAs to place Cas9 cuts on both sides of an intended insertion site, creating a geometry-matched window for strand invasion during HDR. The paper presents it as a practical design principle for more efficient precise knock-in editing.
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improving CRISPR-Cas9 homology-directed repair-mediated integration
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editing structurally constrained loci
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C-terminal tagging
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bidirectional promoter rewiring
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long-distance dual-site mutagenesis
Problem solved
It addresses loss of knock-in efficiency caused by misalignment between donor DNA and the endogenous strand-invasion path at structurally constrained loci.; geometric misalignment between donor DNA and the endogenous strand-invasion path; reduced knock-in efficiency when the insertion site is offset from the invasion entry point
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It addresses loss of knock-in efficiency caused by misalignment between donor DNA and the endogenous strand-invasion path at structurally constrained loci.
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geometric misalignment between donor DNA and the endogenous strand-invasion path
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reduced knock-in efficiency when the insertion site is offset from the invasion entry point
Problem links
geometric misalignment between donor DNA and the endogenous strand-invasion path
LiteratureIt addresses loss of knock-in efficiency caused by misalignment between donor DNA and the endogenous strand-invasion path at structurally constrained loci.
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It addresses loss of knock-in efficiency caused by misalignment between donor DNA and the endogenous strand-invasion path at structurally constrained loci.
reduced knock-in efficiency when the insertion site is offset from the invasion entry point
LiteratureIt addresses loss of knock-in efficiency caused by misalignment between donor DNA and the endogenous strand-invasion path at structurally constrained loci.
Source:
It addresses loss of knock-in efficiency caused by misalignment between donor DNA and the endogenous strand-invasion path at structurally constrained loci.
Published Workflows
Dual-single-guide RNA strategy improves CRISPR-mediated homology-directed repair in Aspergillus.
2026Objective: Improve CRISPR-Cas9 homology-directed repair knock-in efficiency in Aspergillus and related fungi by matching cut-site geometry to the endogenous strand-invasion path.
Why it works: The workflow is presented as working because directional UvsC loading around Cas9-induced breaks reveals the spatial origin of strand invasion, which then guides placement of two flanking cuts to create a geometry-matched strand-invasion window for donor integration.
directional strand invasionpairing fidelity between resected chromosomal strand and donor homology armsgeometry matching between cut placement and donor alignmentchromatin immunoprecipitation-based profilingdual-sgRNA flanking-cut design
Stages
- 1.Mechanistic profiling of strand-invasion origin(functional_characterization)
This stage exists to define the spatial origin of strand invasion so that cut placement can be aligned with donor geometry.
Selection: Directional loading of UvsC around Cas9-induced double-strand breaks
- 2.Dual-sgRNA design of flanking cuts(library_design)
This stage converts the mechanistic insight into a practical editing design intended to avoid misalignment-driven HDR failure.
Selection: Placement of two cuts flanking the insertion site to create a geometry-matched strand-invasion window
- 3.Cross-task and cross-species evaluation(confirmatory_validation)
This stage exists to confirm that the dual-sgRNA design principle is not limited to a single edit type or locus context.
Selection: Improved HDR-mediated integration across insert sizes, editing tasks, and fungal species
Taxonomy & Function
Primary hierarchy
Mechanism Branch
Architecture: A reusable architecture pattern for arranging parts into an engineered system.
Techniques
Computational DesignTarget processes
editingrecombinationImplementation Constraints
cofactor dependency: cofactor requirement unknownencoding mode: genetically encodedimplementation constraint: context specific validationoperating role: regulatorswitch architecture: recruitment
The strategy requires CRISPR-Cas9, two sgRNAs positioned to flank the insertion site, and donor DNA with homology arms matched to the inferred strand-invasion geometry.; requires two guide-directed cuts flanking the insertion site; depends on donor homology-arm alignment with the strand-invasion window
The abstract does not show that it solves all causes of low HDR efficiency or establish performance outside the reported fungal systems.; presented in the abstract within fungal systems, especially Aspergillus
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Supporting Sources
Ranked Claims
The dual-single-guide RNA design improves HDR-mediated integration across insert sizes, multiple editing tasks, and multiple fungal species.
Pairing fidelity between the resected chromosomal strand and donor homology arms governs knock-in outcomes.
A dual-single-guide RNA design with two cuts flanking the insertion site consistently and markedly increases homology-directed-repair-mediated integration.
Approval Evidence
1 source3 linked approval claimsfirst-pass slug dual-single-guide-rna-design
we introduce a dual-single-guide RNA design that places two cuts flanking the insertion site to create a geometry-matched strand-invasion window
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generalizabilitysupports
The dual-single-guide RNA design improves HDR-mediated integration across insert sizes, multiple editing tasks, and multiple fungal species.
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mechanistic modelsupports
Pairing fidelity between the resected chromosomal strand and donor homology arms governs knock-in outcomes.
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performance improvementsupports
A dual-single-guide RNA design with two cuts flanking the insertion site consistently and markedly increases homology-directed-repair-mediated integration.
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Comparisons
Source-stated alternatives
The source frames this as a local geometry-based HDR optimization strategy, in contrast to broader HDR-enhancement approaches discussed in related literature such as global pathway-biasing or donor-recruitment methods.
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The source frames this as a local geometry-based HDR optimization strategy, in contrast to broader HDR-enhancement approaches discussed in related literature such as global pathway-biasing or donor-recruitment methods.
Source-backed strengths
consistently and markedly increases homology-directed-repair-mediated integration; works across insert sizes and multiple editing tasks; generalizes across multiple fungal species
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consistently and markedly increases homology-directed-repair-mediated integration
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works across insert sizes and multiple editing tasks
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generalizes across multiple fungal species
Compared with intron-containing CRISPRa construct
dual-single-guide RNA design and intron-containing CRISPRa construct address a similar problem space because they share editing, recombination.
Shared frame: same top-level item type; shared target processes: editing, recombination
Compared with microfluidic organ-on-chip platforms
dual-single-guide RNA design and microfluidic organ-on-chip platforms address a similar problem space because they share editing, recombination.
Shared frame: same top-level item type; shared target processes: editing, recombination
Strengths here: looks easier to implement in practice.
Compared with PMNT mixed with single-stranded DNA color reporter
dual-single-guide RNA design and PMNT mixed with single-stranded DNA color reporter address a similar problem space because they share editing, recombination.
Shared frame: same top-level item type; shared target processes: editing, recombination
Ranked Citations
- 1.