The clinical and molecular spectrum of AGO2-associated Lessel-Kreienkamp neurodevelopmental syndrome.

Pathogenic AGO2 variants cause a spectrum of neurodevelopmental and systemic features, with 97% of individuals showing delayed speech, intellectual disability, and motor delay.

• Why it matters: Understanding how AGO2 mutations lead to phenotypic variability is crucial because AGO2 is central to miRNA-mediated gene regulation, impacting multiple organ systems and neurodevelopment.
• What they did: Researchers analyzed 45 individuals with 33 distinct AGO2 variants, performing phenotypic assessments and functional studies including silencing assays, biochemical analyses, and miRNA sequencing to elucidate molecular mechanisms.
• The result: Variants disrupt AGO2’s structural regions, impairing miRNA interactions and P-body functions, which explains the clinical heterogeneity and highlights AGO2’s essential role in neurodevelopment and multisystemic regulation.