Editing CRISPR and Genome Editing (section)

== <span style="color: #FFFFFF;">Understanding</span> ==
Genome editing is understood through '''Search''' and '''Repair'''.

'''1. The Search (The GPS)''':
Older editing tools (like ZFNs) were hard to program. CRISPR changed everything:
* Scientists create a "Guide RNA" that matches the DNA sequence they want to change.
* They attach this guide to the **Cas9 protein** (the "Molecular Scissors").
* CRISPR floats through the cell until the guide "Velcroes" onto the target DNA.

'''2. The Cut (The Scissors)''':
Once Cas9 finds the spot, it snaps shut and cuts through both strands of the DNA. This creates a "Double-Strand Break."

'''3. The Repair (The Rewrite)''':
The "Magic" of CRISPR actually happens after the cut. The cell's own repair systems take over:
* '''To Stop a Gene''': The cell glues the ends back together sloppily, creating a "Junk" sequence that breaks the gene.
* '''To Fix a Gene''': Scientists provide a "Template" piece of DNA. The cell sees the template and uses it to "Heal" the cut, effectively pasting the new information into the genome.

'''Off-Target Effects''': The biggest danger of CRISPR is "Cutting the wrong spot." If the guide RNA matches a sequence elsewhere in the DNA, CRISPR might accidentally break a healthy gene.
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