'Zombie Cells' Resurrected from the Dead With Genome Transplants: Synthetic Biology Breakthrough at J. Craig Venter Institute
The Breakthrough
Researchers at the J. Craig Venter Institute (JCVI) have resurrected dead bacterial cells by replacing their defunct DNA with a synthetic genome from another species — creating so-called "zombie cells" that function normally despite being biologically dead before the transplant.
How It Works
The Problem They Solved
Previous genome transplant efforts faced a critical challenge: false positives. When transplanting genomes, recipient cells could survive by incorporating just the antibiotic-resistance gene through homologous recombination, not the entire donor genome.
The Solution
The JCVI team killed recipient cells first using mitomycin C (a DNA-damaging chemotherapy drug), making them unable to replicate. This also prevents the recipient genome from incorporating foreign DNA through recombination — eliminating false positives.
The Result
- Dead Mycoplasma capricolum cells received engineered M. mycoides genomes
- A small fraction came back to life and functioned normally
- "The cell is destined to die, but we give it life," says co-author Zumra Peksaglam Seidel
Historical Context
2010: First Synthetic Cell
More than 15 years ago, the same research group (including Craig Venter) chemically synthesized the 1.1-million base-pair genome of M. mycoides and transplanted it into living M. capricolum cells — creating what they called the first synthetic cell.
2016: Cross-Species Transplant
A study successfully transplanted genomes between species within the same bacterial class (Mollicutes).
2026: Zombie Cells
The new approach goes further by starting with dead cells, eliminating the false positive problem entirely.
Why It Matters
Applications
- Drug production: Engineer bacteria to produce pharmaceuticals
- Biofuel synthesis: Create custom microbes for fuel generation
- Genome testing: Validate engineered genomes before committing to living cells
- Broader transfers: Could eventually work with commonly studied species like E. coli
Significance
"For me, this paper represents a significant step forward for genome engineering in synthetic biology," says Olivier Borkowski, a synthetic biologist at INRAE and Paris-Saclay University.
Limitations
- So far only accomplished between closely related species (same class)
- Low survival rate of recipient cells
- Not yet peer-reviewed (posted on bioRxiv)
- Broader inter-class transfers remain a challenge
Source: Nature (d41586-026-00938-6), bioRxiv preprint