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Zinc finger nucleases have also been used in a mouse model of haemophilia [31] and a clinical trial found CD4+ human T-cells with the CCR5 gene disrupted by zinc finger nucleases to be safe as a potential treatment for HIV/AIDS. [32] ZFNs are also used to create a new generation of genetic disease models called isogenic human disease models.
The most common applications for engineered zinc finger arrays include zinc finger transcription factors and zinc finger nucleases, but other applications have also been described. Typical engineered zinc finger arrays have between 3 and 6 individual zinc finger motifs and bind target sites ranging from 9 basepairs to 18 basepairs in length.
The restriction enzymes can be introduced into cells, for use in gene editing or for genome editing in situ, a technique known as genome editing with engineered nucleases. Alongside zinc finger nucleases and CRISPR/Cas9, TALEN is a prominent tool in the field of genome editing.
A recent study demonstrated that a high proportion of 3-finger zinc finger arrays generated by modular assembly fail to bind their intended target with sufficient affinity in a bacterial two-hybrid assay and fail to function as zinc finger nucleases, but the success rate was somewhat higher when sites of the form GNNGNNGNN were targeted. [28]
TALENs are less efficient than CRISPR/Cas9, but they are still a useful tool for genome editing. Zinc finger editing, using zinc finger nucleases Natural genetic engineering (NGE) has been proposed by molecular biologist James A. Shapiro to account for novelty created in the course of biological evolution.
In the early 2000s, German researchers began developing zinc finger nucleases (ZFNs), synthetic proteins whose DNA-binding domains enable them to create double-stranded breaks in DNA at specific points. ZFNs have a higher precision and the advantage of being smaller than Cas9, but ZFNs are not as commonly used as CRISPR-based methods.
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