Novel HUWE1-Related Neurodevelopmental Disorder: Genotypic and Phenotypic Expansion.

Area of Science:

• Genetics
• Neurodevelopmental Biology
• Human Genetics

Background:

• The HUWE1 gene is vital for embryonic development and neural cell differentiation.
• Mutations in HUWE1 are associated with intellectual developmental disorders.
• Understanding HUWE1 variants is crucial for diagnosing neurodevelopmental conditions.

Purpose of the Study:

• To characterize the clinical features of neurodevelopmental disorders in children with HUWE1 gene variants.
• To expand the understanding of the genotypic-phenotypic spectrum of HUWE1-related disorders.

Main Methods:

• Trio whole exome sequencing was performed on seven children with neurodevelopmental disorders and their parents.
• HUWE1 variants were confirmed using Sanger sequencing.

Main Results:

• Seven children were diagnosed with HUWE1-related neurodevelopmental disorder.
• All identified HUWE1 variants were missense, with four novel sites.
• HUWE1 variants affected facial features, height, speech, social skills, and motor development, including chewing and swallowing difficulties in one case.

Conclusions:

• This study expands the known genotypic-phenotypic spectrum of HUWE1 variants.
• The HECT domain of HUWE1 is critical for gene variant pathogenicity.
• Observed symptoms like ADHD, social dysfunction, and abnormal chewing warrant further research.