What explains variation across HUWE1 genotypes?
The report of 35 individuals with HUWE1-related neurodevelopmental disorder could help distinguish two explanations for phenotypic variation. Differences may track variant mechanism and residual HUWE1 function, or they may depend more strongly on sex-linked dosage and developmental context.
Evidence separating these models would include variant class and position, inheritance, sex, X-inactivation measurements where relevant, age-specific developmental profiles, and repeated assessments within shared functional groups. Concordance among individuals with similar variants would favor a mechanism-centered account. Marked variation within those groups, especially when associated with sex or developmental stage, would support a larger role for dosage and context.
