Environment-gene interactions have a powerful impact on embryo development. The ability to precisely edit the genome makes it possible to address questions concerning the specific roles that genes or variants play in modulating the response to environmental challenges. In this chapter, we provide a simplified protocol using CRISPR-Cas9 ribonucleoproteins for genome editing in the zebrafish model organism. The genetic manipulation can then be coupled with chemical screens to identify and understand the mechanism behind toxicants or compounds that modulate development.
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