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TALENs recognise DNA using a protein built letter by letter for that exact target, which works well and takes months to make. CRISPR recognises DNA using a short RNA you can order overnight for a few dollars. That single difference explains why CRISPR spread through the world's laboratories almost immediately. TALENs still have real advantages — no sequence restriction, and they can reach mitochondrial DNA.
| Boyut | CRISPR-Cas9 | TALENs |
|---|---|---|
| How it finds the target | A short RNA guide | A protein built from modules, one per DNA letter |
| Time to retarget | Days — order a new guide | Weeks to months — build a new protein |
| Sequence restriction | Requires a PAM next to the target | None |
| Specificity | Good; mismatches tolerated | Very good; the paired design helps |
| Mitochondrial DNA | Cannot reach it — guide RNA is not imported | Can reach it |
| Size | Large but manageable | Very large and repetitive, awkward to deliver |
| Clinical use | Approved medicine | Cell therapy, including the first gene-edited patient in 2015 |
Sources
- Nature Biotechnology (Miller et al.) · 2011
A TALE nuclease architecture for efficient genome editing ↗