Scientists at the University of Helsinki have identified specific strains of Desulfovibrio bacteria as probable causes of Parkinson’s disease in most cases — a finding that could open the door to screening, prevention, and treatment after more than two centuries without a clear answer on what drives the disease.
At a glance
- Parkinson’s cause: Researchers demonstrated that certain strains of Desulfovibrio bacteria in the gut are probable causes of Parkinson’s disease in the majority of cases.
- Environmental exposure: According to Professor Per Saris, roughly 90 percent of Parkinson’s cases are caused by environmental factors — specifically exposure to these bacterial strains — not individual genes.
- Parkinson’s prevention: The discovery makes it possible to screen for carriers of harmful Desulfovibrio strains and then target them with measures to remove the bacteria from the gut, potentially slowing or preventing the disease.
Why this finding matters
Parkinson’s disease affects around eight million people worldwide. It is progressive and currently has no cure. While treatments can manage symptoms, nothing yet stops the disease from advancing — and for most of its history as a diagnosed condition, no one has known what causes it in the first place.
That gap has now narrowed significantly. The University of Helsinki team found that specific Desulfovibrio strains are likely the environmental trigger behind most cases. The research points to gut bacteria as a primary driver, which aligns with a growing body of science connecting the gut microbiome to neurological conditions.
“Our findings are significant, as the cause of Parkinson’s disease has gone unknown despite attempts to identify it throughout the last two centuries,” said Professor Per Saris. “The findings indicate that specific strains of Desulfovibrio bacteria are likely to cause Parkinson’s disease.”
From cause to possible prevention
What makes this more than a theoretical advance is the practical path it opens. Because the culprit is a gut bacterium, it is in principle detectable and removable.
Saris explained that carriers of these harmful Desulfovibrio strains can now be screened for them. Once identified, those strains can be targeted with interventions to clear them from the gut. The research team believes this could potentially alleviate and slow symptoms in people already living with Parkinson’s — and, crucially, prevent onset altogether in those who carry the bacteria but have not yet developed the disease.
That would be a major shift. Most disease-prevention strategies focus on managing risk factors. Identifying and removing a specific bacterial strain from a person’s gut is a more direct and actionable approach — one that fits within existing frameworks for microbiome-based medicine.
The genetic minority and the environmental majority
One of the striking aspects of the Helsinki findings is what they say about the role of genetics. For decades, genetic research has identified mutations linked to Parkinson’s. But Saris puts that share in context: only about 10 percent of cases are caused by individual genes.
The remaining roughly 90 percent, he says, are caused by environmental exposure — specifically, to these Desulfovibrio bacterial strains. That framing reorients the disease from something largely predetermined by DNA to something that happens because of an encounter with a microorganism. That shift has enormous implications for how medicine approaches both research and public health strategy going forward.
It also raises questions worth watching: which environments or habits promote colonization by these strains, and whether dietary or lifestyle factors influence who carries them. Those are among the threads future research will need to pull.
What comes next
The research does not yet represent a finished tool ready for clinical use. Turning the finding into a validated screening test, determining the safest and most effective ways to clear Desulfovibrio strains from the gut, and running clinical trials to confirm prevention outcomes will all take time and further investment. The finding is compelling, but the road from laboratory discovery to widespread prevention is rarely short.
Still, the direction is clear. For a disease that has resisted explanation for more than 200 years, knowing where to look — and having a plausible mechanism for how to intervene — is a profound step. The University of Helsinki team has given researchers, clinicians, and the eight million people living with Parkinson’s worldwide a genuinely new place to stand.
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For more on this story, see: Yle News
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