Did scientists bring back dire wolves?Scientists at Colossal Biosciences did not fully revive the dire wolf but created a genetically engineered gray wolf with some key dire wolf traits. They achieved this by extracting DNA from ancient dire wolf fossils to identify genetic differences, then used CRISPR gene-editing technology to modify 20 genes in a living gray wolf's cells. Embryos from these edited cells were implanted into domestic dog surrogates, resulting in the birth of three pups that possess a combination of gray wolf and dire wolf characteristics, such as a larger build and distinct fur color. Steps in the Process DNA Extraction: Scientists extracted ancient DNA from fossils of dire wolves to understand the species' complete genome and identify unique genetic markers. Genome Sequencing: This ancient DNA was used to sequence more of the dire wolf genome, allowing researchers to identify the genes responsible for characteristic traits like larger size and specific fur colors. Gene Editing: Using the CRISPR gene-editing tool, researchers edited a living gray wolf's DNA by making modifications at 20 different sites to incorporate the dire wolf versions of those genes. Embryo Creation: The edited gray wolf cells were used to create embryos. Surrogate Mothers: These embryos were then implanted into the uteruses of domestic dog surrogates, who carried and gave birth to the genetically engineered pups. Key Aspects and Criticisms Not a True Revival: Critics emphasize that this is not a true resurrection of the extinct dire wolf. Only a small fraction of the thousands of genetic differences between dire wolves and gray wolves were addressed. Phenotypic Modification: The goal was to imbue gray wolves with some of the dire wolf's obvious physical traits, creating a new, "dire-ish" animal rather than a genetically identical clone of the extinct species. Scientific Value: The work is seen by some as a significant step in de-extinction science, showcasing innovative gene-editing and reproductive technologies. Ecological Role: The revived animals are unlikely to perform the same ecological functions in today's environment that the original dire wolves did.