[Movement disorders].

Area of Science:

• Genetics
• Neurology
• Molecular Biology

Background:

• Apparently non-inherited encephalopathies are increasingly linked to de novo mutations.
• Next-generation sequencing (NGS) has revolutionized the identification of these mutations.
• Clinical presentations often involve overlapping symptoms of epileptic encephalopathy, neurodevelopmental disorders, and hyperkinetic movement disorders.

Purpose of the Study:

• To summarize recent findings on de novo mutations in encephalopathies.
• To define the phenotypes associated with these mutations.
• To discuss the pathophysiology, focusing on synaptopathies.

Main Methods:

• Application of next-generation sequencing techniques.
• Clinical phenotyping of patients with de novo mutations.
• Review of existing literature on encephalopathies and synaptopathies.

Main Results:

• Identification of de novo pathogenic mutations in previously unsuspected genes.
• Characterization of a spectrum of clinical phenotypes including epileptic encephalopathy, neurodevelopmental disorder, and hyperkinetic movement disorders.
• Pathophysiology is often linked to synaptic dysfunction (synaptopathies).

Conclusions:

• De novo mutations play a significant role in apparently non-inherited encephalopathies.
• These genetic alterations lead to a spectrum of neurological disorders with overlapping clinical features.
• Synaptopathies represent a key pathophysiological mechanism in these conditions.