Synthetic Biology (in gene therapy context)

**What it means:** Synthetic biology is the field of engineering biological components and systems that don't exist in nature. In gene therapy, this includes designing custom viral vectors, optimizing gene sequences for specific cell types, and creating "circuit-like" regulatory elements that make gene expression more predictable and controllable. **Relevance to MHS:** The UT Southwestern gene therapy project is fundamentally a synthetic biology effort — they're engineering a custom viral vector that delivers a custom-designed MEF2C expression cassette into specific brain cell types. This is different from simply "adding a gene" — it's building a complete biological delivery system from scratch.