Heterozygous diploid and interspecies SCRaMbLEing

Area of Science:

• Synthetic biology
• Genomics
• Yeast genetics

Background:

• Synthetic genomes like Sc2.0 yeast contain numerous loxPsym sites for genome engineering.
• SCRaMbLE (Synthetic Chromosome Rearrangement and Modification by LoxP-mediated Evolution) induces genomic rearrangements in synthetic chromosomes and plasmids.
• Previous applications of SCRaMbLE were primarily in haploid strains.

Purpose of the Study:

• To investigate the efficacy and robustness of SCRaMbLE in heterozygous diploid yeast strains.
• To assess the phenotypic improvement potential of SCRaMbLE in diploid contexts.
• To explore SCRaMbLE application in interspecies hybrid strains.

Main Methods:

• Generation of heterozygous diploid yeast strains by mating haploid Sc2.0 strains with native parental strains.
• Application of SCRaMbLE to induce genomic rearrangements in these diploid strains.
• Phenotypic analysis and comparison between SCRaMbLEd and non-SCRaMbLEd strains, including interspecies hybrids.

Main Results:

• Heterozygous diploid strains exhibit enhanced robustness to SCRaMbLE compared to haploid strains.
• SCRaMbLE rapidly improves rationally selected phenotypes in heterozygous diploids.
• Independent genomic rearrangements generated similar phenotype enhancements.
• SCRaMbLE is applicable to heterozygous diploid interspecies hybrid strains.

Conclusions:

• Heterozygous diploid yeast strains are superior for SCRaMbLE-mediated genome engineering.
• SCRaMbLE in diploids offers a powerful tool for rapid phenotype improvement and synthetic biology applications.
• The technique's adaptability to interspecies hybrids broadens its potential impact.