Generating single-sex litters: development of CRISPR-Cas9 genetic tools to produce all-male offspring
Douglas, C.; Maciulyte, V.; Zohren, J.; Snell, D. M.; Ojarikre, O. A.; Ellis, P. J.; Turner, J. M. A.
10.1101/2020.09.07.285536 bioRxivShow abstract
Animals are extremely useful genetic tools in science and global resources in agriculture. However, a single sex is often required in surplus, and current genetic methods for producing all-female or all-male litters are inefficient. Using the mouse as a model, we developed a synthetic, two-part bicomponent strategy for generating all-male litters. We achieved this using CRISPR-Cas9 genome editing technology to generate large stable knock-ins on the autosomes and X chromosome. The bicomponent system functions via the sex-specific co-inheritance of a Cas9 transgene and an sgRNA transgene targeting the essential Topoisomerase 1 gene. This technology proved to be highly efficient in generating on-target mutations, resulting in embryonic lethality of the target sex. Our study is the first to successfully generate all-male mammalian litters using a CRISPR-Cas9 bicomponent system and provides great strides towards generating single-sex litters for laboratory or agricultural research.
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