Unconfirmed scientific breakthrough sparks ethical and moral concerns
A scientist in China claims to have created the world’s first genetically edited babies, in a potentially ground-breaking and controversial medical first.
If true, it would be a profound leap of science and ethics. This kind of gene editing is banned in most countries as the technology is still experimental and DNA changes can pass to future generations, potentially with unforeseen side-effects.
Related: Super-smart designer babies could be on offer soon. But is that ethical? | Philip Ball
Crispr, or to give it its full name, Crispr-Cas9, allows scientists to precisely target and edit pieces of the genome. Crispr is a guide molecule made of RNA, that allows a specific site of interest on the DNA double helix to be targeted. The RNA molecule is attached to Cas9, a bacterial enzyme that works as a pair of "molecular scissors" to cut the DNA at the exact point required. This allows scientists to cut, paste and delete single letters of genetic code.
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