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CRISPhieRmix: a hierarchical mixture model for CRISPR pooled screens
- Daley, Timothy P., Lin, Zhixiang, Lin, Xueqiu, Liu, Yanxia, Wong, Wing Hung, Qi, Lei S.
- Genome biology 2018 v.19 no.1 pp. 159
- gene editing, models, phenotype
- Pooled CRISPR screens allow researchers to interrogate genetic causes of complex phenotypes at the genome-wide scale and promise higher specificity and sensitivity compared to competing technologies. Unfortunately, two problems exist, particularly for CRISPRi/a screens: variability in guide efficiency and large rare off-target effects. We present a method, CRISPhieRmix, that resolves these issues by using a hierarchical mixture model with a broad-tailed null distribution. We show that CRISPhieRmix allows for more accurate and powerful inferences in large-scale pooled CRISPRi/a screens. We discuss key issues in the analysis and design of screens, particularly the number of guides needed for faithful full discovery.