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• W4386020906 abstract "Abstract Background Fusarium Head Blight is a destructive floral disease of different cereal crops. The Ascomycete fungus Fusarium graminearum ( Fg ) is one of the main causal agents of FHB in wheat and barley. The role(s) in virulence of Fg genes include genetic studies that involve the transformation of the fungus with different expression cassettes. We have observed in several studies where Fg genes functions were characterised that integration of expression cassettes occurred randomly. Random insertion of a cassette may disrupt gene expression and/or protein functions and hence the overall conclusion of the study. Target site integration (TSI) is an approach that consists in identifying a chromosomal region where the cassette can be inserted. The identification of a suitable locus for TSI in Fg would avert the potential risks of ectopic integration. Results Here, we identified a highly conserved intergenic region on chromosome 1 suitable for TSI. We named this intergenic region the TSI locus 1. We developed an efficient cloning vector system based on the Golden Gate method to clone different expression cassettes for use in combination with TSI locus 1. We present evidence that integrations in the TSI locus 1 affects neither fungal virulence nor fungal growth under different stress conditions. Integrations at the TSI locus 1 resulted in the expression of different gene fusions. In addition, the activities of Fg native promoters were not altered by integration into the TSI locus 1. We have developed a bespoke bioinformatic pipeline to analyse the existence of ectopic integrations and tandem insertions of the cassette that may occurred during the transformation process. Finally, we established a protocol to study protein secretion in wheat coleoptiles using confocal microscopy and the TSI locus 1. Conclusion The TSI locus 1 can be used in Fg and potentially other cereal infecting Fusarium species for diverse studies including promoter activity analysis, secretion, protein localisation studies and gene complementation. The bespoke bioinformatic pipeline developed in this work can be an alternative to southern blotting, the gold standard technique to identify ectopic integration and tandem insertions in fungal transformation." @default.
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• W4386020906 date "2023-08-21" @default.
• W4386020906 modified "2023-10-09" @default.
• W4386020906 title "Identification and functional characterisation of a locus for target site integration in<i>Fusarium graminearum</i>" @default.
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• W4386020906 doi "https://doi.org/10.1101/2023.08.20.553861" @default.
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