Multiple Sclerosis and HERV-W/MSRV: A Multicentric Study

Area of Science:

• Neuroscience
• Virology
• Genetics

Background:

• Multiple Sclerosis (MS) is a chronic neurological disease with complex etiology.
• The potential role of infectious agents, such as retroviruses, in MS pathogenesis is under investigation.
• Multiple Sclerosis Retrovirus (MSRV) has been implicated in MS, but requires further validation in diverse populations.

Purpose of the Study:

• To investigate the prevalence and viral load of MSRV in a large, multi-centric cohort of MS patients and controls.
• To analyze MSRV presence in blood and cerebrospinal fluid (CSF) across different European ethnic groups.
• To determine the association between MSRV and MS in comparison to neurological and healthy controls.

Main Methods:

• A multicentric study involving 149 MS patients and 153 controls from Sardinia, Spain, Northern Italy, and Sweden.
• MSRV detection using nested and real-time PCR assays targeting pol and env genes within a single laboratory to minimize variability.
• Statistical analysis to compare MSRV detection rates and viral loads between MS patients and control groups.

Main Results:

• Significant differences in MSRV detection were observed between MS patients and both neurological (p<0.05) and healthy controls (p<0.001).
• The presence and viral load of MSRV were significantly associated with MS across all investigated ethnic groups.
• MSRV detection rates varied significantly between MS patients and control groups, irrespective of ethnicity.

Conclusions:

• MSRV presence and viral load are significantly associated with Multiple Sclerosis.
• The findings support a potential etiological role for MSRV in MS pathogenesis.
• Further research is warranted to elucidate the mechanisms underlying MSRV's association with MS.