David Liu

Type: Person (Gene Editing Pioneer)

David Liu is the most consequential figure in precision genome editing. A professor at Harvard, core member of the Broad Institute, and Howard Hughes Medical Institute investigator, Liu invented both base editing (2016) and prime editing (2019) — the two technologies that have moved gene editing beyond the double-strand-break paradigm of traditional CRISPR-Cas9.

Base editing enables direct chemical conversion of one DNA base to another (C-to-T or A-to-G) without cutting the DNA backbone. Prime editing extends this further, enabling any targeted insertion, deletion, or all 12 types of point mutations — a true "search-and-replace" for the genome. Both technologies are now in clinical trials, with 19 base/prime editing trials underway across 5 countries.

Liu's most recent major contribution (Nature, November 2025) is the suppressor tRNA approach: using prime editing to install suppressor tRNA genes that read through premature stop codons. This addresses approximately 30% of rare genetic diseases in a disease-agnostic manner — a single molecular strategy applicable to thousands of conditions. The work improved misincorporation error rates from 1-in-7 to 1-in-101.

Liu received the 2025 Breakthrough Prize in Life Sciences, widely considered the most prestigious award in the field alongside the Nobel Prize.

Key Contributions

• Invented base editing (2016) — direct chemical base conversion without DNA breaks (Prime Editing Suppressor tRNAs)
• Invented prime editing (2019) — search-and-replace genome editing (Prime Editing Suppressor tRNAs)
• Suppressor tRNA disease-agnostic therapy (2025) — addresses ~30% of rare diseases (Prime Editing Suppressor tRNAs)
• 2025 Breakthrough Prize in Life Sciences (Prime Editing Suppressor tRNAs)

Mentioned In

• Prime Editing — Core inventor
• CRISPR Clinical Translation — Technologies powering clinical pipeline
• Gene Therapy Delivery — Delivery challenges for prime-edited therapies

Related Entities

• Broad Institute — Home institution