A caller cistron therapy has slowed the progression of Huntingdon's illness by arsenic overmuch arsenic 75%.
Known arsenic AMT-130, it is delivered via encephalon surgery, and a azygous dose is expected to past someone's full life.
"This effect changes everything," said main researcher Professor Ed Wild.
30-year-old Jack May-Davis, who took portion successful trials, said the results were "astonishing", leaving him "lost for words".
Huntingdon's is simply a neurodegenerative illness which gets worse implicit clip and has nary cure, affecting thinking, question and mood. About 8,000 radical successful the UK endure from it.
While the illness typically lasts for astir 20 years, nonaccomplishment of relation tin statesman rather quickly.
In a trial, 12 patients were fixed the highest dose of AMT-130. Researchers reported they experienced 75% little illness progression aft 36 months compared to a radical of radical with Huntington's who were not fixed the treatment.
AMT-130 works by permanently introducing caller functional DNA into a person's cells, researchers said.
"On the ground of these results it seems apt AMT-130 volition beryllium the archetypal licensed attraction to dilatory Huntington's disease, which is genuinely world-changing stuff," said Prof Wild, from the University College London (UCL) Huntington's Disease Centre.
"My patients successful the proceedings are unchangeable implicit clip successful a mode I'm not utilized to seeing successful Huntington's disease."
One of them, helium added, was medically retired but has been capable to instrumentality to work.
Professor Sarah Tabrizi, besides from UCL, said AMT-130 had the imaginable to "preserve regular function", support radical successful enactment longer, and "meaningfully dilatory illness progression".
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Jack May-Davis, from Sussex, discovered helium was carrying the Huntington's cistron erstwhile helium was 19.
Two household members, including his father, died from Huntingdon's.
"It is conscionable amazing," helium said. "When I started participating successful trials I ne'er thought thing would beryllium developed successful a clip framework that mightiness really beryllium utile for me.
"This feels similar a immense infinitesimal that volition mean truthful overmuch to families who transportation the Huntington's gene."
Professor Mike Hanna, manager of the UCL Queen Square Institute of Neurology, said: "These findings constituent to a caller section successful cistron therapy improvement for Huntington's disease, and person wide relevance for different devastating neurodegenerative disorders."
Cath Staney, main enforcement of the Huntington's Disease Association, said: "This is simply a important breakthrough, and I americium definite it volition bring anticipation to anyone affected by Huntington's disease.
"This proceedings shows an astonishing 75% slowing of progression successful the disease.
"That is singular and volition bring much-needed optimism to the Huntington's illness community."