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Clustered regulatory interspaced short palindromic repeats (CRISPR)‐mediated mutagenesis and phenotype rescue by piggyBac transgenesis in a nonmodel Drosophila species

Tanaka, R., Murakami, H., Ote, M., Yamamoto, D.
Insect molecular biology 2016 v.25 no.4 pp. 355-361
Drosophila subobscura, courtship, genes, genetic techniques and protocols, germ cells, mutagenesis, mutants, phenotype, phylogeny, transgenesis
How behavioural diversity emerged in evolution is an unexplored subject in biology. To tackle this problem, genes and circuits for a behaviour need to be determined in different species for phylogenetic comparisons. The recently developed clustered regulatory interspaced short palindromic repeats/CRISPR associated protein9 (CRISPR/Cas9) system made such a challenge possible by providing the means to induce mutations in a gene of interest in any organism. Aiming at elucidating diversification in genetic and neural networks for courtship behaviour, we attempted to generate a genetic tool kit in Drosophila subobscura, a nonmodel species distantly related to the genetic model Drosophila melanogaster. Here we report the generation of yellow (y) and white mutations with the aid of the CRISPR/Cas9 system, and the rescue of the y mutant phenotype by germline transformation of the newly established y mutant fly line with a y⁺‐marked piggyBac vector. This successful mutagenesis and transformation in D. subobscura open up an avenue for comprehensive genetic analyses of higher functions in this and other nonmodel Drosophila species, representing a key step toward systematic comparisons of genes and circuitries underlying behaviour amongst species.