|United States Of America||Published Application||20200149064||05/14/2020||2016-029|
|Patent Cooperation Treaty||Published Application||WO2017136335||08/10/2017||2016-029|
The clinical application of targeted nucleases - such as zinc-finger nucleases, TALENs, and CRISPR/Cas9 – are exciting genome editing platforms. Delivery of nucleases to cells and tissues using as viral methods, however, can leave the nucleases stably present in the target cells, even after editing has been accomplished. One major safety concern is off-target effects (i.e. cutting a non-intended site), which pose a safety risk. Another safety concern for gene therapies is the long-term expression of a foreign protein potentially provoking inflammatory reactions, another safety risk.
To avoid these potential detrimental outcomes, researchers at UC Berkeley have modified the delivered nuclease DNA which will cleave the host genome target DNA site and also excise its own DNA from the stable delivered construct. The researchers have shown that there is no trace of any active delivered DNA remaining, thus mitigating the harmful side effects from nuclease based gene therapy.