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2018 ; 8
(1
): 7960
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Inducible high-efficiency CRISPR-Cas9-targeted gene editing and precision base
editing in African trypanosomes
#MMPMID29785042
Rico E
; Jeacock L
; Ková?ová J
; Horn D
Sci Rep
2018[May]; 8
(1
): 7960
PMID29785042
show ga
The Cas9 endonuclease can be programmed by guide RNA to introduce
sequence-specific breaks in genomic DNA. Thus, Cas9-based approaches present a
range of novel options for genome manipulation and precision editing. African
trypanosomes are parasites that cause lethal human and animal diseases. They also
serve as models for studies on eukaryotic biology, including 'divergent' biology.
Genome modification, exploiting the native homologous recombination machinery,
has been important for studies on trypanosomes but often requires multiple rounds
of transfection using selectable markers that integrate at low efficiency. We
report a system for delivering tetracycline inducible Cas9 and guide RNA to
Trypanosoma brucei. In these cells, targeted DNA cleavage and gene disruption can
be achieved at close to 100% efficiency without further selection. Disruption of
aquaglyceroporin (AQP2) or amino acid transporter genes confers resistance to the
clinical drugs pentamidine or eflornithine, respectively, providing simple and
robust assays for editing efficiency. We also use the new system for
homology-directed, precision base editing; a single-stranded
oligodeoxyribonucleotide repair template was delivered to introduce a single AQP2
- T(791)G/L(264)R mutation in this case. The technology we describe now enables a
range of novel programmed genome-editing approaches in T. brucei that would
benefit from temporal control, high-efficiency and precision.