Activity of Huntington’s disease gene curbed for 6 months in mice

[Kittamaru]

http://www.psypost.org/2016/09/activity-huntingtons-disease-gene-curbed-6-months-mice-44870

A single injection of a new treatment has reduced the activity of the gene responsible for Huntington’s disease for several months in a trial in mice.

Huntington’s disease is a genetic disorder that affects around 1 in every 10,000 people and damages nerve cells in the brain. This causes neurological symptoms affecting movement, cognition and behaviour.


Huntington’s usually only begins to show symptoms in adulthood. There is currently no cure and no way to slow the progression of the disease. Symptoms typically progress over 10-25 years until the person eventually dies.

Now, the EU-funded FINGERS4CURE project team led by researchers at Imperial College London have engineered a therapeutic protein called a ‘zinc finger’.

Huntington’s disease is caused by a mutant form of a single gene called Huntingtin. The zinc finger protein works by targeting the mutant copies of the Huntingtin gene, repressing its ability to express and create harmful proteins.

In the new study involving mice, published in the journal Molecular Neurodegeneration, the injection of zinc finger repressed the mutant copies of the gene for at least six months.

This is absolutely incredible - if they can reproduce these results and show a continued lack of debilitating side effects... which it looks like is what their next steps may well be:

In a previous study in mice, the team had curbed the mutant gene’s activity for just a couple of weeks. By tweaking the ingredients of the zinc finger in the new study they were able to extend its effects to several months, repressing the disease gene over that period without seeing any harmful side effects. This involved making the zinc finger as invisible to the immune system as possible.

Project lead Dr Mark Isalan from the Department of Life Sciences at Imperial said: “We are extremely excited by our latest results, which show a lot of promise for treating Huntington’s disease.

“However, while these encouraging results in mice mean that the zinc finger looks like a good candidate to take forward to human trials, we still need to do a lot of work first to answer important questions around the safety of the intervention, whether repeat treatments are effective, whether there might be longer-term side effects, and whether we can extend and increase the benefits beyond six months.

“In this study we weren’t looking at how repressing the gene activity affected the symptoms of the disease and this is obviously a critical question as well. However, we have reason to be confident from our previous studies that repressing the gene does in fact significantly reduce symptoms.

“If all goes well and we have further positive results, we would aim to start clinical trials within five years to see whether the treatment could be safe and effective in humans. We are urgently looking for industry partners and funding to achieve this.”

The mutant Huntingtin gene is thought to cause toxic levels of protein to aggregate in the brain. Preventing the activity of this gene could theoretically halt the disease, but this has been difficult to achieve.

For a disease that we have had, essentially, no effective way to treat or even slow... this is incredible news!