Cleave and Rescue gamete killers create conditions for gene drive in plants

Area of Science:

• Genetics
• Molecular Biology
• Synthetic Biology

Background:

• Gene drive systems offer novel ways to alter wild populations.
• Cleave and Rescue (ClvR) gene drives utilize DNA modification to spread linked traits.
• These drives target essential genes, creating a selective pressure for inheritance.

Purpose of the Study:

• To demonstrate the functionality of ClvR gene drive elements in the model plant Arabidopsis thaliana.
• To assess the efficacy of ClvR in driving genetic modification and population suppression.
• To evaluate the potential for resistance allele formation in a plant system.

Main Methods:

• Utilizing Cas9/gRNAs to disrupt an essential gene (YKT61) in Arabidopsis.
• Introducing a recoded, cleavage-resistant version of the essential gene linked to the drive.
• Observing gamete lethality in individuals lacking the ClvR element.
• Employing population modeling to predict drive dynamics and robustness.

Main Results:

• Successful disruption of the endogenous YKT61 gene by the ClvR element.
• Lethality observed in gametes lacking the functional, recoded YKT61 gene.
• No resistant alleles were detected, indicating efficient drive spread.
• Modeling suggested robust performance against potential failure modes.

Conclusions:

• ClvR gene drives are effectively demonstrated in Arabidopsis thaliana.
• The system shows potential for rapid population modification or suppression in plants.
• The absence of resistance alleles suggests a robust gene drive mechanism.