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Home / New Zealand

Scientists may have found cause of ME

Independent
9 Oct, 2009 03:00 PM3 mins to read

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Scientists say they have made a dramatic breakthrough in understanding the cause of chronic fatigue syndrome - a debilitating condition affecting 250,000 people in Britain which for decades has defied a rational medical explanation.

The researchers have discovered a strong link between chronic fatigue syndrome, which is sometimes known as
ME or myalgic encephalomyelitis, and an obscure retrovirus related to a group of viruses found to infect mice.

Although the published data falls short of proving a definitive cause-and-effect, one of the scientists behind the study said last night she was confident that further unpublished data she had gathered in the past few weeks implicated the retrovirus as an important and perhaps sole cause of the condition.

Chronic fatigue syndrome has blighted the lives of an estimated 17 million people worldwide because its symptoms, long-term tiredness and aching limbs, do not go away with sleep or rest.

The condition initially generated much controversy in the 1980s, when it was known as "yuppie flu", because some medical authorities doubted if it was a genuine physical illness.

In the absence of a proven cause, many scientists have questioned whether there could ever be one reason behind so many different symptoms, so the latest research showing a strong link to a single virus has generated intense excitement among experts.

The study, published in the journal Science, shows that the virus, called murine leukaemia virus-related virus (XMRV), was found in 68 of 101 patients from around the US with chronic fatigue syndrome.

This compared with just eight of 218 healthy "controls" drawn at random from the same parts of the US, the scientists said.

But the senior author of the study, Judy Mikovits, director of research at the Whittemore Peterson Institute in Reno, Nevada, said further blood tests have revealed that more than 95 per cent of patients with the syndrome have antibodies to the virus - indicating they have been infected with XMRV, which can lie dormant within a patient's DNA.

"With those numbers, I would say, yes, we've found the cause of chronic fatigue syndrome. We also have data showing that the virus attacks the human immune system," said Dr Mikovits. She is testing a further 500 blood samples gathered from chronic fatigue patients diagnosed in London.

"The same percentages are holding up," she said.

If the findings are replicated by other groups and the XMRV virus is accepted as a cause of chronic fatigue syndrome then it could be possible to treat patients with antivirals, just like treating HIV, or to develop a vaccine against the virus to protect people from developing the condition, said Dr Mikovits.

"We now have compelling proof that a retrovirus named XMRV is present in more than two-thirds of patient samples with chronic fatigue syndrome. This finding could be a major step in the discovery of vital treatment options for millions of patients," she said.

The genetic structure of the XMRV virus indicates it has evolved from a similar virus found in wild field mice. Dr Mikovits suggested it could have jumped the species barrier from mouse to man like many other human viruses, such as HIV, another retrovirus, which is thought to have infected humans from monkeys or apes.

- INDEPENDENT

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