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The group of reNEW Leiden AI Richard Davis has published a step-by-step protocol for the STRAIGHT-IN genome editing platform in Nature Protocols. This publication provides researchers with a background in molecular biology and standard cell culture techniques the ability to rapidly generate genetically modified human pluripotent stem cell lines. By offering a comprehensive protocol, the team opens new avenues for future studies across the wider scientific community.
Human stem cells offer excellent possibilities for modeling development and diseases. “Studies using models derived from these cells often offer insights that are directly applicable to human health, reducing the need for animal testing. However, progress has been hindered by the challenge of easily inserting large DNA fragments into these cells; a critical hurdle that researchers are striving to overcome,” explains Davis. To address this, his team developed the STRAIGHT-IN platform, which allows the rapid and precise integration of large DNA sequences, even over 50 kb, into human pluripotent stem cells. The necessary materials, including plasmids and a detailed protocol, are now publicly available for other researchers to establish their own STRAIGHT-IN cell lines.
STRAIGHT-IN at a glance
The STRAIGHT-IN method involves three key steps. First, a cassette containing a ‘landing pad’ is introduced into a user-selected location in the DNA. Next, a ‘donor’ DNA fragment can recombine with the landing pad and integrate specifically at that genomic site. Finally, all DNA sequences that were required to facilitate this process are removed, leaving just the target DNA fragment behind. “Researchers with experience in molecular biology and standard cell culture techniques do not require additional training to use this platform,” says Albert Blanch-Asensio, first author of the paper. “The procedure is quick as well: once the landing pad is placed into the cells, changes to the DNA can be made within a week, and cell lines can be fully validated in approximately one and a half months.”
Possible applications
The technique opens new possibilities for future research using human pluripotent stem cell-derived cells. By enabling the seamless integration of very large DNA fragments, these possibilities include integrating complex genetic circuits that would otherwise be challenging. Additionally, by pooling together several ‘donor’ fragments, the platform can be used to generate multiple genetically matched human stem cell lines simultaneously . This capability is particularly useful for studying the impact of multiple disease-linked variants concurrently. Davis concludes: “Our publication in Nature Protocols opens these possibilities not only to our own lab but also to the wider scientific community. We are excited to see the diverse applications and discoveries that others in the field will achieve using this platform.”
More information on STRAIGHT-IN
STRAIGHT-IN was previously used in two publications:
