Genome‐wide analyses of PAM‐relaxed Cas9 genome editors reveal substantial off‐target effects by ABE8e in rice

May 7, 2022Plant biotechnology journal

Genome-wide study shows ABE8e gene editor causes many off-target changes in rice

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Abstract

ABE8e results in ~500 genome-wide A-to-G off-target mutations at TA motif sites per transgenic plant.

  • Genome-wide of various Cas9 nucleases and base editors in rice have been examined.
  • Distinct off-target sites are preferred by Cas9 nucleases and base editors when using the same guide RNA.
  • SpRY editors generate additional, but minor, off-target mutations from newly created guide RNAs.
  • The preference of ABE8e for the TA motif is evident at both off-target and target sites.
  • from tissue culture significantly contributes to background mutations in edited plants.

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Key numbers

~500
Off-target A-to-G mutations per plant
Average number of A-to-G mutations induced by ABE8e in transgenic rice plants.

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