Restless Legs Syndrome: A Network Model of Iron-Dependent Neuromodulation-A Narrative Review

Area of Science:

• Neuroscience
• Genetics
• Sleep Medicine

Background:

• Restless legs syndrome (RLS) is traditionally viewed as a dopamine-related disorder.
• Emerging evidence points to a complex, heterogeneous neurobiological basis for RLS.
• This includes iron metabolism, adenosinergic signaling, and glutamatergic pathways.

Purpose of the Study:

• To synthesize current evidence on RLS neurobiology.
• To propose an integrative, network-based model for RLS.
• To highlight the need for standardized methodologies and multimodal research.

Main Methods:

• Narrative review of clinical, genetic, and neuroimaging studies.
• Synthesis of findings related to neuromodulatory imbalance and brain iron.
• Development of a hypothesis-generating, network-based model.

Main Results:

• Dopaminergic dysfunction in RLS occurs within a broader neuromodulatory imbalance.
• Altered brain iron distribution is suggested by neuroimaging, though results vary.
• RLS impacts quality of life and is linked to neuropsychiatric comorbidities.

Conclusions:

• An integrative model posits iron-dependent neuromodulation affecting cortico-striatal-thalamo-limbic circuits in RLS.
• Current diagnostic frameworks are phenomenological, and biomarkers lack validation.
• Future research should test this model, refine stratification, and explore network-informed therapies for RLS.