PhieABEs: a PAM‐less/free high‐efficiency adenine base editor toolbox with wide target scope in plants

Jan 5, 2022Plant biotechnology journal

PhieABEs: A highly efficient adenine base editing tool without PAM limits for targeting many sites in plants

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Abstract

PhieABEs demonstrate nearly 100% editing efficiency at some tested sites in rice.

  • PhieABEs are a new toolbox combining an evolved adenosine deaminase and a DNA-binding domain that enhances editing capabilities.
  • This toolbox significantly improves base-editing activity and expands the target range compared to existing systems.
  • The hyper ABE8e-DBD-SpRYn variant showed a high proportion of homozygous base substitutions within the editing windows.
  • No off-target changes were observed with the hyper ABE8e-DBD-SpRYn variant under the tested conditions.
  • The original single guide RNA was found to be more compatible with PhieABEs than the evolved version.

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Key numbers

100%
Editing Efficiency
Editing efficiency at select target sites with .
78.5%
Average Editing Efficiency
Average editing efficiency of hyABE8e-SpRY across tested sites.

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