Variants in CUL4B are associated with cerebral malformations

Area of Science:

• Genetics
• Neuroscience
• Developmental Biology

Background:

• Cullin 4B (CUL4B) gene variants are established causes of syndromic X-linked intellectual disability.
• Intellectual disability presents a significant challenge in understanding neurodevelopmental disorders.

Purpose of the Study:

• To identify and characterize novel CUL4B variants in patients with intellectual disability.
• To investigate the spectrum of neuroimaging findings associated with CUL4B variants.
• To explore potential molecular mechanisms underlying CUL4B-related neurodevelopmental abnormalities.

Main Methods:

• Genetic sequencing to identify variants in CUL4B.
• Pathogenicity confirmation of identified variants.
• Neuroimaging analysis (MRI) of affected patients.
• Exploration of protein-protein interactions between CUL4B and WDR62.

Main Results:

• Nine novel CUL4B variants were identified in 25 patients across 11 families.
• Pathogenicity was confirmed for all identified nontruncating variants.
• Neuroimaging revealed cerebral malformations, including malformations of cortical development, ventriculomegaly, and reduced white matter volume in 10 out of 15 patients.
• CUL4B was shown to interact with WDR62, a protein implicated in microcephaly and malformations of cortical development.

Conclusions:

• Variants in CUL4B contribute to a spectrum of cerebral malformations and intellectual disability.
• The interaction between CUL4B and WDR62 may play a crucial role in the pathogenesis of these neurodevelopmental disorders.
• Further research into CUL4B's role in brain development is warranted.