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CRISPR/Cas9-mediated knock-in of alligator cathelicidin gene in a non-coding region of channel catfish genome.

Abstract：

:CRISPR/Cas9-based gene knockout in animal cells, particularly in teleosts, has proven to be very efficient with regards to mutation rates, but the precise insertion of exogenous DNA or gene knock-in via the homology-directed repair (HDR) pathway has seldom been achieved outside of the model organisms. Here, we succeeded in integrating with high efficiency an exogenous alligator cathelicidin gene into a targeted non-coding region of channel catfish (Ictalurus punctatus) chromosome 1 using two different donor templates (synthesized linear dsDNA and cloned plasmid DNA constructs). We also tested two different promoters for driving the gene, zebrafish ubiquitin promoter and common carp β-actin promoter, harboring a 250-bp homologous region flanking both sides of the genomic target locus. Integration rates were found higher in dead fry than in live fingerlings, indicating either off-target effects or pleiotropic effects. Furthermore, low levels of mosaicism were detected in the tissues of P1 individuals harboring the transgene, and high transgene expression was observed in the blood of some P1 fish. This can be an indication of the localization of cathelicidin in neutrophils and macrophage granules as also observed in most antimicrobial peptides. This study marks the first use of CRISPR/Cas9 HDR for gene integration in channel catfish and may contribute to the generation of a more efficient system for precise gene integration in catfish and other aquaculture species, and the development of gene-edited, disease-resistant fish.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Simora RMC,Xing,Bangs MR,Wang W,Ma X,Su B,Khan MGQ,Qin Z,Lu C,Alston V,Hettiarachchi D,Johnson A,Li S,Coogan M,Gurbatow J,Terhune JS,Wang X,Dunham RA

doi

10.1038/s41598-020-79409-5

subject

Has Abstract

pub_date

2020-12-17 00:00:00

pages

22271

issue

1

issn

2045-2322

pii

10.1038/s41598-020-79409-5

journal_volume

10

pub_type

杂志文章

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