Neurological outcome in WDR62 primary microcephaly

Area of Science:

• Neuroscience
• Genetics
• Developmental Biology

Background:

• Primary microcephaly is a rare neurological disorder characterized by reduced head circumference.
• Mutations in the WD repeat domain 62 (WDR62) gene are a known cause of primary microcephaly.
• Understanding the full spectrum of WDR62-related phenotypes is crucial for diagnosis and management.

Purpose of the Study:

• To characterize the cortical structure, developmental, and cognitive profiles of patients with WDR62-related primary microcephaly.
• To identify novel WDR62 variants and analyze genotype-phenotype correlations.
• To assess the long-term developmental trajectory and potential for autonomy in affected individuals.

Main Methods:

• Observational study of 17 patients with WDR62-related microcephaly.
• Clinical assessment of developmental, neurological, and cognitive status.
• Brain imaging (MRI) to evaluate cortical structure and malformations.
• Genetic analysis to identify WDR62 variants.
• Analysis of previously reported WDR62-related phenotypes.

Main Results:

• Brain malformations (pachygyria, heterotopia, schizencephaly, microlissencephaly) were observed in 11/15 patients.
• Mean full-scale IQ was 51.8, with intellectual disability ranging from mild to severe.
• Adaptive behavior scores indicated challenges in communication and motor skills, but socialization was relatively preserved.
• One patient developed progressive ataxia in their second decade of life.

Conclusions:

• WDR62-related microcephaly presents with significant brain malformations and intellectual disability.
• Cognitive consequences may be less severe than anticipated in some cases, with preserved autonomy.
• Progressive ataxia can occur, necessitating long-term clinical follow-up.