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An albino possum proves that CRISPR works in marsupials too

John Ellens by John Ellens
July 22, 2021
in Technology
0
An albino possum proves that CRISPR works in marsupials too
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Whereas kangaroos and koalas are higher recognized, researchers finding out marsupials typically use possums in laboratory experiments as a result of they’re smaller and simpler to look after. Grey short-tailed opossums, the species used within the examine, are associated to the white-faced North American opossums, however they’re smaller and don’t have any pouch.

Riken’s researchers used CRISPR to delete or flip off a gene that codes for pigment manufacturing. Focusing on this gene meant that if the experiments labored, the outcomes could possibly be seen at a look: the opossums can be albino if each copies of the gene had been turned off, and speckled or mosaic if a single copy was eliminated.

The ensuing litter included an albino opossum and a mosaic opossum (pictured above). The researchers additionally bred the 2, leading to a litter of absolutely albino possums, exhibiting that the coloring was an inherited genetic trait.

The researchers needed to overcome some hurdles with a view to edit the opossum genome. First, they needed to discover out when the hormone injections would happen with a view to put together the animals for being pregnant. The opposite problem was that shortly after fertilization, marsupials developed a thick layer round them referred to as the mucous membrane. This makes it troublesome to inject the CRISPR therapy into the cells. On her first makes an attempt, needles both would not penetrate the cells or would injury them so the embryos could not survive, says Kiyonari.

The researchers realized that it could be a lot simpler to inject earlier, earlier than the coating across the egg received too laborious. By altering when the lights had been turned off within the labs, the researchers received the possums to mate later within the night so the eggs can be able to work with them within the morning, a couple of day and a half later.

The researchers then used a instrument referred to as a piezoelectric drill that makes use of electrical cost to make it simpler to penetrate the membrane. This helped them inject the cells with out damaging them.

“I feel it is an unbelievable outcome,” says Richard Behringer, a geneticist on the College of Texas. “You have got proven that it’s attainable. Now it is time for biology, ”he provides.

Opossums have been used as laboratory animals for the reason that 1970s, and researchers have been attempting to switch their genes for at the very least 25 years, says VandeBerg, who started making an attempt the primary laboratory opossum colony in 1978. They had been additionally the primary marsupials to have their genome absolutely sequenced in 2007.

Comparative biologists hope that the power to genetically modify possums will assist them be taught extra about among the distinctive facets of marsupial biology which have but to be deciphered. “We discover genes and marsupial genomes that we do not have, which puzzles them,” says Rob Miller, an immunologist on the College of New Mexico who makes use of possums in his analysis.

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