Expanding the Phenotype of <b><i>TUBB2A</i></b>-Related Tubulinopathy: Three Cases of a Novel, Heterozygous <b><i>TUBB2A</i></b> Pathogenic Variant p.Gly98Arg

Abstract

Tubulinopathies are a group of conditions caused by variants in 6 tubulin genes that present with a spectrum of brain malformations. One of these conditions is <i>TUBB2A</i>-related tubulinopathy. Currently, there are 9 reported individuals with pathogenic variants within the <i>TUBB2A</i> gene, with common manifestations including, but not limited to, global developmental delay, seizures, cortical dysplasia, and dysmorphic corpus callosum. We report 3 patients identified by exome and genome sequencing to have a novel, pathogenic, missense variant in <i>TUBB2A</i> (p.Gly98Arg). They presented similarly with intellectual disability, hypotonia, and global developmental delay and varied with respect to the type of cortical brain malformation, seizure history, diagnosis of autism spectrum disorder, and other features. This case series expands the natural history of <i>TUBB2A</i>-related tubulinopathy while describing the presentation of a novel, pathogenic, missense variant in 3 patients.