Aussie scientists make genetic breakthrough in battle to eradicate cane toads

September 20, 2018
SYDNEY, NSW - AUGUST 09:  A Cane Toad is exhibited at Taronga Zoo August 9, 2005 in Sydney, Australia. The Cane Toad, which is poisonous, is reportedly being blamed for the deaths of a number of Australia's most dangerous predator, the Salt Water Crocodile. A three-metre long crocodile was found dead by a local crocodile tour operator last week in the Adelaide River, with the tourism operator suspecting the reptile had been poisoned after eating a toad. The director of Wildlife Management International, Graeme Webb, says he suspects that up to "20 to 30 per cent" of fresh water crocodiles will be lost to cane toads in this way.    (Photo by Ian Waldie/Getty Images)

Australia's self-inflicted cane toad invasion may soon be over after scientists cracked the deadly amphibian's DNA code.

International scientists working with UNSW Sydney, the University of Sydney and Deakin University have unlocked more than 90 per cent of the invasive amphibian's genome.

The poisonous toads have wreaked havoc on northern quolls, freshwater crocodiles and several species of native lizards and snakes since their introduction in Queensland in 1935 to help control cane beetles.

Millions of toads now occupy more than 1.2 million square kilometres of Australia following a seemingly unstoppable march across the top end.

Virologist Professor Peter White says despite the pesky cane toad's iconic status there were major gaps in the scientific community's understanding of its genetics.

"But we've now got the blueprint as well as the plans to the factory," he told AAP.

Already Mr White's team has used the toad's genetics to find three new viruses that with further work may become biocontrols to stem the toad's march across the country.

"We're now going to see how prevalent they are in the population, going all the way back to South America, and then we'll see how pathogenic they are," he said.

"Hopefully, they're very pathogenic, and then we can begin testing them."

Mr White said the team needed to be sure any biocontrol created won't affect native amphibians.

"We don't want to introduce anything that's going to kill frogs or newts, it has to be cane toad specific," he said.

Viruses have previously been successfully used to control the European rabbit population.

The findings were published in the academic journal GigaScience.

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