The many faces of KIF7

Area of Science:

• Genetics and Molecular Biology
• Neurodevelopmental Disorders
• Ciliopathies

Background:

• KIF7 gene mutations are associated with several neurodevelopmental disorders, including hydrolethalis, acrocallosal syndrome, and Joubert syndrome.
• KIF7 encodes a kinesin complex component crucial for intraflagellar transport in cilia, playing a role in embryonic development.

Purpose of the Study:

• To identify novel KIF7 mutations in patients with diverse neurogenetic phenotypes.
• To expand the understanding of the phenotypic spectrum associated with KIF7 mutations.

Main Methods:

• Genetic sequencing of KIF7 in a cohort of patients with various neurogenetic phenotypes.
• Clinical and neuroimaging (brain MRI) evaluation of affected individuals.

Main Results:

• Identified novel KIF7 mutations in two families exhibiting known KIF7-related disorder phenotypes.
• Discovered a novel truncating KIF7 mutation in a third family presenting with intellectual disability and isolated corpus callosum dysgenesis without overt ciliopathy signs.
• These findings contribute new pathogenic alleles for KIF7.

Conclusions:

• KIF7-related disorders encompass a broader range of phenotypes than previously recognized.
• Isolated corpus callosum dysgenesis with intellectual disability should be considered within the KIF7-related phenotype spectrum.
• Warrants consideration for KIF7 gene sequencing in patients with these specific neurodevelopmental presentations.