A 'switch off' mechanism for genetic defect behind Down's syndrome developed

A way to "switch off" the genetic defect responsible for Down's syndrome has been developed by scientists in the US.

The technique has only been tried in the lab but researchers hope it could pave the way to correcting the disorder.

Children with Down's Syndrome are born with three copies of a particular DNA package rather than the usual two - which causes health problems and a shortened life span.

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