* Animal experiments show gene therapy can boost performance

* Gene doping likely to be dangerous and risky in humans

* Tests can't detect it, so status of gene doping unclear

LONDON, Aug 7 (Reuters) - There have been "marathon mice",

"Schwarzenegger mice" and dogs whose wasted muscles were

repaired with injected substances that switch off key genes. It

may not be long before we get the first genetically modified

athlete.

Some fear the use of gene therapy to improve athleticism is

already a reality. But since sports authorities' drug testing

Link:

FEATURE-Testers fear reality of genetically modified Olympians