Pre-Diagnostic Factors Associated with Coding-Based Incident Multiple System Atrophy: A Nested Case-Control Study of...

Area of Science:

• Neuroscience
• Epidemiology
• Genetics

Background:

• Multiple system atrophy (MSA) is a rare neurodegenerative synucleinopathy.
• Epidemiological risk factors for MSA are not well-characterized.

Purpose of the Study:

• Identify pre-diagnostic features and candidate risk factors for incident MSA.
• Compare risk factors between MSA, Parkinson's disease (PD), and healthy controls using UK Biobank data.

Main Methods:

• Utilized iterative logistic regression models to identify risk factors from sociodemographic, lifestyle, environmental, and medical data.
• Adjusted for baseline age and sex, with Benjamini-Hochberg correction.
• Evaluated candidate risk factors at baseline and using 5- and 10-year latency windows to assess reverse causation.

Main Results:

• Identified 114 incident MSA cases, 1139 PD cases, and 1075 controls.
• Baseline associations with antihistamine use, alcohol use, and reduced physical activity attenuated with latency, suggesting reverse causation.
• Rural living was associated with increased MSA risk, with the effect strengthening over longer latency windows.

Conclusions:

• Incident MSA in UK Biobank shows a long pre-diagnostic phase with autonomic and lifestyle changes.
• Rural living may be a significant environmental risk factor for MSA.
• Further research is warranted to investigate the role of rural living in MSA etiology.