Colossal Biosciences De-Extincts Dire Wolves Using Ancient DNA and Gene Editing

The De-Extinction of the Dire Wolf

• 🐺 Colossal Biosciences claims to have successfully de-extincted the dire wolf, a species that vanished approximately 12,500 years ago.
• 💡 The project utilized ancient DNA from dire wolf fossils, cloning, and gene-editing technology to alter grey wolf cells.
• 🧬 Scientists assembled high-quality genomes from fossils and compared them to living canids to identify genetic variants for dire wolf traits.

Birth and Development of New Dire Wolves

• 🐾 Three pups, named Romulus, Remus, and Khaleesi, have been born as part of this groundbreaking initiative.
• 📈 Romulus and Remus were born in October 2024, and Khaleesi in January 2025; they are already weighing around 80 lb and are expected to reach 140 lb at maturity.
• 🍽️ The pups were initially fed a milk replacer, then weaned onto solid foods including ground meats and whole prey, consuming meat and bones.

Dire Wolf Characteristics and Ancestry

• 🏔️ The dire wolf was a top predator in North America from about 2.6 million to 11,700 years ago.
• 🧬 The grey wolf is the dire wolf's closest living relative, with a genetic similarity of 99.5%.
• 📏 Dire wolves were larger and more muscular than grey wolves, possessing distinct traits like lighter coats and thicker fur, which scientists targeted for replication.

Technological Approach and Future Implications

• 🔬 Colossal scientists made 20 edits across 14 genes in grey wolf cells to incorporate dire wolf DNA variants.
• 🌍 The company views de-extinction as recreating specific phenotypes, marking a significant leap for science and conservation.
• 🚀 This achievement is highlighted by Khaleesi appearing on the cover of Time magazine, drawing parallels to public interest in other de-extinction projects like woolly mammoths.