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Aguilar, Gustavo; Bauer, Milena; Vigano, M. Alessandra; Schnider, Sophie T.; Brügger, Lukas; Jiménez-Jiménez, Carlos; Guerrero, Isabel; Affolter, Markus
Developmental cell, 07/2024Journal Article
CRISPR-Cas greatly facilitated the integration of exogenous sequences into specific loci. However, knockin generation in multicellular animals remains challenging, partially due to the complexity of insertion screening. Here, we describe SEED/Harvest, a method to generate knockins in Drosophila, based on CRISPR-Cas and the single-strand annealing (SSA) repair pathway. In SEED (from “scarless editing by element deletion”), a switchable cassette is first integrated into the target locus. In a subsequent CRISPR-triggered repair event, resolved by SSA, the cassette is seamlessly removed. Germline excision of SEED cassettes allows for fast and robust knockin generation of both fluorescent proteins and short protein tags in tandem. Tissue-specific expression of Cas9 results in somatic cassette excision, conferring spatiotemporal control of protein labeling and the conditional rescue of mutants. Finally, to achieve conditional protein labeling and manipulation of short tag knockins, we developed a genetic toolbox by functionalizing the ALFA nanobody. Display omitted •SEED/Harvest permits scarless tagging via single-strand annealing pathway in Drosophila•Tissue-specific Cas9 expression permits conditional endogenous tagging and mutant rescue•Tandem tagging strategy to simultaneously manipulate and visualize proteins•Engineered ALFA nanobody permits efficient live imaging of endogenously tagged proteins Aguilar and Bauer et al. propose SEED (“scarless editing by element deletion”)/Harvest, a two-step gene-editing strategy that utilizes the SSA pathway to generate seamless knockins in Drosophila. SEED/Harvest allows for spatially restricted endogenous tagging and conditional rescues, mediated by tissue-specific Cas9 expression.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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