The team says the approach may one day treat a range of inherited diseases.
Base editing alters the fundamental building blocks of DNA: the four bases adenine, cytosine, guanine and thymine.
They are commonly known by their respective letters, A, C, G and T.
All the instructions for building and running the human body are encoded in combinations of those four bases.
The team in China edited it back.
They scanned DNA for the error then converted a G to an A, correcting the fault.
He said their study opens new avenues for treating patients and preventing babies being born with beta-thalassemia, “and even other inherited diseases”.
Base editing works on the DNA bases themselves to convert one into another.
He says the technique is more efficient and has fewer unwanted side-effects than Crispr.
Prof Robin Lovell-Badge, from the Francis Crick Institute in London, described parts of their latest study as “ingenious”.
Prof Lovell-Badge said these approaches are unlikely to be used clinically anytime soon.
“There would need to be far more debate, covering the ethics, and how these approaches should be regulated.
“And in many countries, including China, there needs to be more robust mechanisms established for regulation, oversight, and long-term follow-up.”