Editing of the urease gene by CRISPR-Cas in the diatom Thalassiosira pseudonana

Amanda Hopes, Vladimir Nekrasov, Sophien Kamoun, Thomas Mock

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Background: CRISPR-Cas is a recent and powerful addition to the molecular toolbox which allows programmable genome editing. It has been used to modify genes in a wide variety of organisms, but only two alga to date. Here we present a methodology to edit the genome of Thalassiosira pseudonana, a model centric diatom with both ecological significance and high biotechnological potential, using CRISPR-Cas.

Results: A single construct was assembled using Golden Gate cloning. Two sgRNAs were used to introduce a precise 37 nt deletion early in the coding region of the urease gene. A high percentage of bi-allelic mutations (≤61.5%) were observed in clones with the CRISPR-Cas construct. Growth of bi-allelic mutants in urea led to a significant reduction in growth rate and cell size compared to growth in nitrate.

Conclusions: CRISPR-Cas can precisely and efficiently edit the genome of T. pseudonana. The use of Golden Gate cloning to assemble CRISPR-Cas constructs gives additional flexibility to the CRISPR-Cas method and facilitates modifications to target alternative genes or species.
Original languageEnglish
Article number49
JournalPlant Methods
Issue number1
Publication statusPublished - 24 Nov 2016


  • CRISPR-Cas
  • Diatom
  • Genome editing
  • Urease
  • Golden Gate
  • Thalassiosira pseudonana

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