Bi-allelic TTC5 variants cause delayed developmental milestones and intellectual disability

The overlapping and non-specific symptoms observed in patients with intellectual disability syndromes can make diagnosis difficult. Here, we report a new genetic intellectual disability syndrome in 8 patients characterized by moderate to severe intellectual disability, delayed verbal and motor milestones, and hypotonia. All patients have pathogenic variants in TTC5, a scaffold protein linked to many cellular processes; most notably DNA acetylation. Brain imaging revealed structural brain defects including a thin corpus callosum and cerebral atrophy with dilated lateral ventricles and simplified gyral pattern. These cornerstone clinical features can be used to prioritize this syndrome for diagnosis. (By Dr. Ashleigh E Schaffer, )

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