As you’ve probably heard the Dire wolves are back! … Sort of.
Colossal Biosciences has sequenced the genetic code of the extinct dire wolf and used it to produce living animals. … Sorta kinda.
“Relying on deft genetic engineering and ancient, preserved DNA, Colossal scientists (photog’s note: The scientists themselves are normal sized. Only the company name is larger than life.) deciphered the dire wolf genome, rewrote the genetic code of the common gray wolf to match it, and, using domestic dogs as surrogate mothers, brought Romulus, Remus, and their sister, 2-month-old Khaleesi, into the world during three separate births last fall and this winter—effectively for the first time de-extincting a line of beasts whose live gene pool long ago vanished.”
So they reused the whole genome of the dire wolf to clone these animals? Ah, no.
“It takes surprisingly few genetic changes to spell the difference between a living species and an extinct one. Like other canids, a wolf has about 19,000 genes. (Humans and mice have about 30,000.) Creating the dire wolves called for making just 20 edits in 14 genes in the common gray wolf”
…
“The scientists then rewrote the 14 key genes in the cell’s nucleus to match those of the dire wolf; no ancient dire wolf DNA was actually spliced into the gray wolf’s genome.”
So they edited 14 genes out of 19,000 and that was all that was necessary to turn a common gray wolf into this long extinct species? In the immortal words of Doc Holliday, “I beg to differ.”
But okay I won’t minimize the work that has been done here. This is groundbreaking science and technology. Colossal Biosciences (boy that’s some name) is also working on the Wooly Mammoth project. They’re going to edit the DNA of one of the modern elephants (Indian?) and supposedly resurrect the mammoth.
“The effort to produce a woolly mammoth is on something of a tight schedule. … Asian elephants—the extinct woolly mammoth’s closest surviving kin—require 22 months, the longest gestation period of any mammal.
And this genetic transformation will involve even more than the one that created the wolves. “We were originally talking about editing about 65 genes,” says Lamm. “We’re now talking about 85 different genes, and some of those will have multiple [functions] like cold tolerance—which includes additional subcutaneous fat layers and their shaggy coat.” As with the dire wolves, no ancient mammoth DNA will be spliced into the elephant’s genome; the elephant genes will simply be rewritten to match the mammoth’s. The company says it has so far edited 25 of those genes, and is “on track for our embryos to be ready for implantation by the end of 2026,” to meet its goal of a calf being born in 2028.
No matter how the resulting woolly baby might look, Colossal admits that in some respects it will be a mammoth in name only. “They’re elephant surrogates that have some mammoth DNA to make them re-create core characteristics belonging to mammoths,” says Shapiro.”
Well, it’s good that they’re being realistic about what they’re doing. These are the first faltering steps in the path that will lead to a deep understanding of how to restore an extinct species. I think the only way that restored species will occur will involve studying several generations of progressively closer and closer versions of these “restored creatures. Even the fact that these animals are gestated in the wombs of different species must have profound effects on their biology. I’m guessing real “de-extinction” is a hundred years away. I won’t see it happen but I’m excited to see the beginning of it.
Not quite, “Welcome to Jurassic Park.”
Update:
Here’s a video discussing this.