Stephen Spiro, professor of respiratory medicine at University College Hospital in London, said it was difficult to know how teachers and pupils might be affected by the asbestos.

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Professor Michael Adler, Head of Reproductive Health at University College Hospital in London, said the study reinforced the importance of taking a good sexual history from people visiting STD clinics.

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Professor John Wyatt, of the London's University College Hospital's department of paediatrics and child health, said one of the issues was that the debate was extremely "polarised" with some seeing it as a black or white issue.

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In the last few months I've seen new hospitals like University College in London, the new Queen Elizabeth Hospital planned in Birmingham or Whiston Hospital in Knowsley, where I laid the foundation stone.

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The study is taking place in collaboration with Professor Alan Thompson at the National Hospital for Neurology and Neurosurgery (part of University College London Hospitals NHS Foundation Trust) and Institute of Neurology, University College London.

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Scientists at Massachusetts General Hospital, the University of Massachusetts and Kings College in London found the mutation by doing detailed sequencing of the genes in several families with an inherited form of ALS. The findings are published in the February 27 issue of the journal Science and were partially funded by the ALS Association.

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The study at the Robert Jones and Agnes Hunt Orthopaedic Hospital near Oswestry is being run by Dr Gareth Ackland at University College London Hospitals.

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The study was led by Patricia Conrod, of King's College London's Institute of Psychiatry, with the University of Montreal and Sainte-Justine University Hospital Center in Canada.

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