Wildtype heterogeneity contributes to clonal variability in genome edited cells.

Area of Science:

• Molecular Biology
• Genomics
• Cell Biology

Background:

• CRISPR-Cas9 genome editing simplifies gene function studies but faces reproducibility challenges.
• Phenotypic variability in knockout clones hinders genotype-phenotype correlation.
• Current protocols aim to reduce off-target effects but often fail to eliminate variability.

Purpose of the Study:

• To identify confounding factors in genome editing reproducibility.
• To investigate the impact of wild-type cell heterogeneity on experimental outcomes.
• To propose methods for enhancing the reproducibility of genome editing experiments.

Main Methods:

• Analysis of phenotypic differences between isolated wild-type cell clones.
• Transcriptomic analysis (RNA sequencing) of wild-type cell populations.
• Comparison of cellular and biochemical alterations in different wild-type clones.
• Generation and assessment of monoclonal isogenic wild-type cells as controls.

Main Results:

• Significant phenotypic and transcriptomic differences were observed between wild-type clones.
• Wild-type cell heterogeneity contributes to variability in genome-edited cell populations.
• Monoclonal isogenic wild-type cells exhibited reduced phenotypic variability.
• A wide range of cellular alterations in wild-type clones mimicked effects seen in genome-edited cells.

Conclusions:

• Wild-type cell heterogeneity is a critical, often overlooked, factor affecting genome editing reproducibility.
• Establishing matched isogenic control cell lines prior to genome editing is crucial for reliable results.
• This approach enhances the robustness of genotype-phenotype correlations in genome editing studies.