Brain Calcification and Movement Disorders.

Area of Science:

• Neuroscience
• Genetics
• Radiology

Background:

• Brain calcifications are often incidental findings but can signal various disorders.
• Primary familial brain calcification (PFBC) is a newly recognized genetic disorder characterized by brain calcifications beyond the basal ganglia.
• PFBC is typically inherited in an autosomal dominant pattern and presents heterogeneously.

Purpose of the Study:

• To review the current understanding of primary familial brain calcification (PFBC).
• To highlight the genetic causes and pathophysiological mechanisms of PFBC.
• To discuss the clinical presentation and diagnostic challenges of PFBC.

Main Methods:

• Review of existing literature on PFBC.
• Analysis of genetic studies identifying causative genes for autosomal dominant PFBC.
• Correlation of clinical phenotypes with genetic findings.

Main Results:

• Four genes (SLC20A2, PDGFRB, PDGFB, XPR1) are identified as causes of autosomal dominant PFBC.
• Disrupted phosphate homeostasis is suggested as a unifying pathophysiological mechanism.
• Clinical manifestations are diverse, including movement disorders, cognitive decline, and psychiatric symptoms, but genetic cause cannot be predicted from clinical presentation.

Conclusions:

• PFBC is a genetically heterogeneous disorder with significant clinical variability.
• Genetic testing is crucial for diagnosing PFBC, but clinical features do not reliably predict the specific genetic cause.
• Further research is needed to understand the full spectrum of PFBC and its underlying mechanisms.