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Scientists Just Created a ‘Woolly Mouse’ With Mammoth-Like Fur

The Owner Press by The Owner Press
March 5, 2025
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De-extinction startup Colossal Biosciences has gene-edited mice to have mammoth-like options, creating what the corporate calls the Colossal Woolly Mouse. The lab mice, which have been modified to have shaggy fur and golden coats, are an illustration of the form of gene edits that the corporate hopes to carry out on a a lot bigger scale, modifying Asian elephants to extra carefully resemble their woolly mammoth ancestors.

The genomes of the Colossal mice have been edited at a number of factors to alter their fur so it was longer, frizzier, and extra golden than that of regular lab mice. Among the mice additionally had edits to a gene concerned within the metabolism of fatty acids, which ought to change how the animals retailer fats—one other key distinction between mammoths and Asian elephants. Out of a number of cohorts of gene-edited mice, one set had edits in seven totally different genes, most of which have been concerned in hair kind and one in all which managed fats metabolism.

Scientists have already got a very good understanding of how modifications in mouse genetics affect their fur, so many of the edits chosen by the Colossal scientists re-created these modifications reasonably than utilizing mammoth DNA because the mannequin. “We didn’t simply shove mammoth genes right into a mouse. There’s 200 million years of evolutionary divergence between them, and that wouldn’t make any sense” from both a scientific or moral perspective, says Beth Shapiro, chief science officer at Colossal.

In addition to the genes already properly understood from mouse analysis, the Colossal scientists additionally mined historic mammoth genomes to determine three genes that appeared to be vital to mammoths’ adaptation to the chilly. Two of those genes influenced hair kind, whereas a 3rd affected fats metabolism. The researchers then tried totally different combos of edits in numerous teams of mice, producing some mice with frizzy fur, some with curly whiskers, and a few with fluffy golden coats. The experiments are described in a preprint paper that has not been peer-reviewed or revealed in a scientific journal.

“These mice are massively cute,” says Colossal cofounder and CEO Ben Lamm. “They’re considerably cuter than we anticipated, which most likely signifies that our first-generation mammoths can even be equally as cute.” Lamm shared a photograph of the woolly mice of their habitat on the Colossal places of work, accompanied by a woolly mammoth toy and dwelling towards a snowy background. The corporate has no intentions to breed or promote the woolly mice, the CEO added.

The Colossal experiment raises questions on which gene edits qualify to make a mouse—or an Asian elephant—actually mammoth-like, says Vincent Lynch, a developmental biologist on the College at Buffalo in New York who wasn’t concerned within the Colossal examine. The Colossal mice are fluffier and frizzier than most lab mice, that’s for certain, however these traits nonetheless seem in different mice naturally. Or, to place it one other manner, is a chow chow extra mammoth-like than a Chihuahua, or is it merely a a lot fluffier canine?

The place you land on that spectrum is partly a query of semantics and partly one in all genetics. Colossal refers to its would-be de-extinct mammoths as “cold-resistant elephants,” with the core organic traits of a mammoth however genetically virtually similar to an Asian elephant. Lamm says the corporate is concentrating on about 85 genes to create the cold-resistant elephants and has experimented with enhancing 25 of these genes. The gene-edited mice, he says, will probably be helpful for testing much less seen traits like fats metabolism.



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