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A pill that can correct a wide range of faulty genes which cause crippling illnesses should be available within three years, promising a revolution in the treatment of thousands of conditions.

As well as offering hope of a first effective treatment for two conditions that are at present incurable, the drug [called PTC124] should also work against more than 1,800 other genetic illnesses, [because it] targets a particular type of mutation that can cause very different symptoms according to the gene that is disrupted.