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Changes to the microbes that live in the gut can identify people at greater risk of Parkinson’s disease long before symptoms develop, according to a new study that also raises hopes for novel therapies.Discovery of a Distinct Gut Microbiome Signature in At‑Risk IndividualsResearchers at University College London led by Prof Anthony Schapira identified a microbial pattern that is more pronounced in individuals carrying a genetic risk for Parkinson’s and even stronger in diagnosed patients. The signature was detectable in a small fraction of the general population, suggesting a pre‑symptomatic risk group.Scale of the Study and Microbial Shifts Quantified271 Parkinson’s patients, 43 genetically predisposed but asymptomatic participants, and 150 healthy controls were initially analysed.Differences were found in 176 gut microbe species (over a quarter of the total surveyed).Follow‑up validation used data from 638 Parkinson’s cases and 319 controls across the UK, South Korea and Turkey.The alterations were independent of medication use and correlated with dietary patterns high in processed foods and saturated fats.Implications for Early Diagnosis and Preventive StrategiesThe microbial signature could enable clinicians to flag high‑risk individuals years before motor symptoms appear, opening a window for interventions such as diet modification or microbiome‑targeted therapies. Alpha‑synuclein production, a protein linked to neuronal damage, may be influenced by gut inflammation driven by specific bacteria.Future Directions: Clinical Trials and Therapeutic ProspectsFurther research is needed to determine causality and to test whether reshaping the gut ecosystem can delay or prevent disease onset. Ongoing clinical trials will explore probiotic, prebiotic, and dietary approaches, while the findings reinforce the growing emphasis on lifestyle factors in Parkinson’s management.