CRISPR-Cas9 has eased the induction of sequence-specific mutations and has therefore become a powerful tool to generate mutant lines for studying the role of specific genes. The cellular repair of Cas9-induced double-stranded DNA breaks by the error-prone nonhomologous end-joining pathway can result in various indel mutations. Having identified and chosen a specific mutation in a target gene, the establishment of a respective mutant line requires a feasible and precise method to differentiate the genotypes of the offspring. Here, we provide a protocol that allows genotyping of large numbers of Nothobranchius furzeri embryos, larvae, and adults harboring a previously identified indel or point mutation in a short time via high-resolution melt analysis (HRMA).
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