Europe South Asia Asia Pacific Americas Middle East Africa BBC Homepage World Service Education

Front Page



UK Politics







Talking Point
On Air
Low Graphics

Friday, June 5, 1998 Published at 23:41 GMT 00:41 UK


Scientists find dementia gene

Alzheimer's affects 650,000 people in the UK

Scientists have identified a gene which they believe causes a rare form of dementia and could unlock the key to the most common form, Alzheimer's Disease.

Three studies funded by the National Institute on Ageing in the USA are published this month and examine the tau gene.

They show that the gene, when it is defective, causes a tangle of protein which clogs up and eventually kills brain cells. Healthy forms of the gene help to carry chemical messages in and between brain cells.

Presenile dementia

One report, published in the Proceedings of the National Academy of Sciences, shows how the mutated gene can affect presenile dementia, a rare inherited disease whose symptoms include dementia, palsy and rigid muscles.

Scientists at Cambridge University say the research shows the tau gene has a big effect on dementia diseases which cause muscle spasms and shaking.

Train wreck

Dr Marcelle Morrison-Bogorad, of the National Institute of Ageing, said the stringy tangle of protein was like "a train wreck in the middle of a city, affecting all the streets coming into the centre".

In presenile dementia, the "wreck" is found in the front part of the brain, which controls conscious thought, while in Alzheimer's it is found in the hippocampus, which is linked to memory.

Around 650,000 people in the UK have Alzheimer's. Most are over 65. Two per cent of people aged between 65 and 75 have the progressive disease and 20% of over 75s develop it. There is no cure.

Scientists have known about the stringy protein tangle for some time, but it is only now that they have managed to identify the gene thought to play a big part in causing it.

Advanced options | Search tips

Back to top | BBC News Home | BBC Homepage |

Health Contents

Background Briefings
Medical notes
Internet Links

Alzheimer's Disease Society

The Whole Brain Atlas

Alzheimer's Association

The BBC is not responsible for the content of external internet sites.

In this section

Disability in depth

Spotlight: Bristol inquiry

Antibiotics: A fading wonder

Mental health: An overview

Alternative medicine: A growth industry

The meningitis files

Long-term care: A special report

Aids up close

From cradle to grave

NHS reforms: A guide

NHS Performance 1999

From Special Report
NHS in crisis: Special report

British Medical Association conference '99

Royal College of Nursing conference '99