Hitching a ride with a retroelement
Retroviruses and retroelements have inserted their genetic code into mammalian genomes throughout evolution. Although many of these integrated virus-like sequences pose a threat to genomic integrity, some have been retooled by mammalian cells to perform essential roles in development. Segel
et al
. found that one of these retroviral-like proteins, PEG10, directly binds to and secretes its own mRNA in extracellular virus–like capsids. These virus-like particles were then pseudotyped with fusogens to deliver functional mRNA cargos to mammalian cells. This potentially provides an endogenous vector for RNA-based gene therapy. —DJ
Highlights d Tagmentation-based tag integration site sequencing (TTISS) scalably detects DSBs d TTISS is a rapid and streamlined protocol compatible with multiplexing d Application of TTISS highlights trade-off in Cas9 variant specificity and activity d LZ3 Cas9 variant exhibits a unique +1 insertion profile
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