Australia Freezes Koala Genes to Save Species from Extinction

When koalas die in wildlife hospitals across Australia, scientists are now saving something precious: their chance at a future.

Researchers at the University of Queensland have launched a groundbreaking project to freeze koala sperm and eggs in liquid nitrogen at minus 321 degrees Fahrenheit. These frozen cells can be preserved for decades and later used to create healthy koala embryos through artificial insemination and IVF.

The timing couldn't be more critical. Koala populations in Queensland and New South Wales have crashed by up to 80% since the late 1990s due to deforestation, bushfires, drought, and disease. In 2022, the Australian government officially listed eastern koalas as endangered.

"Losing genetic diversity can weaken future generations and decreases the ability of the species to adapt to challenges," says reproductive biologist Andres Gambini. Every koala that dies takes unique genetic traits with it, traits that might help future generations survive climate change or resist disease.

Wildlife hospitals will supply the reproductive cells from koalas that have died or can no longer breed due to illness or injury. The team will test each sample for Chlamydia pecorum, a deadly infection that affects up to 90% of some koala populations and causes infertility in females.

If they find the infection, the scientists have the technology to remove it from the samples before freezing. This means even cells from sick koalas could help create healthy joeys in the future.

The project builds on proven success. In 1998, team member Steve Johnston helped create the world's first koala joey born through artificial insemination. Just this year, Gambini's team produced the first-ever IVF kangaroo embryos, showing these techniques work for marsupials.

The Bright Side

Australia faces a strange paradox with its koalas. While populations are crashing in some regions, other areas have too many koalas, and they're overbrowsing the trees they need to survive. This genetic bank could help restore struggling populations using diversity from healthier groups.

The frozen backup doesn't replace traditional conservation like protecting forests and treating disease. But it creates an insurance policy against losing precious genetic diversity while scientists work on those bigger challenges.

Evolutionary biologist Vincent Lynch, who has successfully revived cells frozen for decades, believes the approach offers real hope. "By preserving the environment with traditional conservation" alongside genetic banking, scientists are giving koalas a fighting chance.

Every sample frozen today is a potential koala tomorrow, carrying genes that might one day help the species adapt and thrive again.