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Genetic analysis reveals parasitic origin of contagious cancer devastating Tasmanian devils

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Tasmanian devil infected with devil tumor facial diseaseThe deadly, contagious cancer that puts Tasmanian devils (Sarcophilus harrisii) at risk of extinction may have originated in another species, according to research published Thursday in the journal Science.

The cancer, known as devil facial tumor disease (DFTD), has wiped out nearly 70 percent of the world’s Tasmanian devils in the past 10 years. Once DFTD infects a devil, the cancer destroys the animal’s mouth, filling it with tumors that make it impossible for the animal to eat. Starvation and death follow within three to six months. Transmission is easy, because devils frequently bite one another on the mouth during mating or while fighting for territory.

Until now, scientists have had few, if any, clues to the origins of DFTD. But the new research indicates that the cancer may have actually attached itself to the Tasmanian devils, perhaps via their prey, as a kind of parasite.

The researchers behind this discovery sampled 25 different DFTD tumors from all over the Australian island of Tasmania (the only place that devils live in the wild). After sequencing the tumors’ genes, the team found that the growths were all genetically distinct from the devils themselves, but otherwise essentially identical to one another. In other words, the malignancies do not have the same DNA as the animals they are killing.

Meanwhile, the sequencing found that DFTD originates in Schwann cells, which are vital to the peripheral nervous system, and that a particular protein, periaxin, which is expressed by these cells, was also present in every tumor. According to lead researcher Elizabeth Murchison of Cold Spring Harbor Laboratory in Long Island, N.Y., the presence of periaxin could be used to diagnose DFTD before symptoms begin to display, an important step in quarantining disease-free devils to maintain a healthy population. It could also, possibly, be exploited to try to find a cure for the disease.

Other mutations of periaxin have been linked to forms of Charcot-Marie-Tooth disease. Guillain-Barré syndrome is also caused by Schwann cell malfunctions.

Murchison, a native of Tasmania, earlier this year received a L’Oréal-UNESCO UK and Ireland for Women in Science Fellowship for her work with DFTD and another transmissible cancer known as canine transmissible venereal tumor.


Image: Tasmanian devil infested with devil facial tumor disease, via Wikimedia Commons





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  1. 1. Grasshopper1 5:42 pm 12/31/2009

    Chytrid fungus, Colony Collapse Disorder, White Nose Syndrome, and now Devil Facial Tumor Disease. . . [sigh]

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  2. 2. Grasshopper1 5:43 pm 12/31/2009

    Could this disease possibly be harmful to humans?

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  3. 3. Bops 9:31 pm 12/31/2009

    scoccerdad,
    Are you so mentally challenged that the only comments you can make are really dumb?

    Link to this
  4. 4. robert schmidt 3:15 pm 01/1/2010

    @scoccerdad, actually I blame a great deal more on idiots like yourself who discard reason in favour of their own paranoid delusions to justify living in a state of denial.

    Link to this
  5. 5. Soccerdad 5:29 pm 01/1/2010

    Robert,

    I do not live in a state of denial – I live in the state of Michigan, the worker’s paradise.

    Link to this
  6. 6. hotblack 10:14 am 01/3/2010

    Which worker? You guys have just one? No wonder we had to bail you guys out…

    Link to this
  7. 7. Grasshopper1 2:54 pm 01/3/2010

    Can we just get back to discussing the article?!?

    Link to this
  8. 8. pseudo-nymn 12:03 pm 01/4/2010

    what is there to discuss? a minor slight commenting against a geo-political phenomena, or the imature over reactions of ignoramie? because the only option left after those are the topic and no one comes here for that.

    Link to this
  9. 9. JRWard 7:34 pm 01/4/2010

    First thing I wondered about when I heard about the tumors was whether they were a similar phonomenon to the tumors observed in dogs that turned out to be cancer cells spread from one dog to another by sloughing off during intimate physical contact. So I wasn’t surprized to see that the same researcher figured out both diseases.

    I also recollect that HeLa cells (cancer cells from a patient named Henrietta Lachs, that were cultured for research in many labs) had contaminated many other cell cultures in research labs during the 1960s, Perhaps other human cancers are spread the same way, it is not the patient’s own cells that have turned cancerous, but cancer cells pick up from some other source?

    Link to this
  10. 10. bertwindon 3:38 pm 01/5/2010

    Looks like they really have found a clue or two. Happy New Year researchers and TDs all !

    Link to this
  11. 11. rrocklin 5:59 pm 01/6/2010

    Sounds like a case of paranoia or some personal problem rather than a case of rationality.

    Link to this

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