Autosomal recessive variants in TUBGCP2 alter the gamma-tubulin ring complex leading to neurodevelopmental disease


GÜNGÖR S., OKTAY Y., Hiz S., Aranguren-Ibanez A., Kalafatcilar I., Yaramis A., ...More

ISCIENCE, vol.24, no.1, 2021 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 24 Issue: 1
  • Publication Date: 2021
  • Doi Number: 10.1016/j.isci.2020.101948
  • Journal Name: ISCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Directory of Open Access Journals
  • Keywords: Biological Sciences, Clinical Neuroscience, Molecular Neuroscience, Neuroscience, Protemics, Systems Biology
  • Dokuz Eylül University Affiliated: Yes

Abstract

Microtubules help building the cytoskeleton of neurons and other cells. Several components of the gamma-tubulin (gamma-tubulin) complex have been previously reported in human neurodevelopmental diseases. We describe two siblings from a consanguineous Turkish familywith dysmorphic features, developmental delay, brain malformation, and epilepsy carrying a homozygous mutation (p.Glu311Lys) in TUBGCP2 encoding the gamma-tubulin complex 2 (GCP2) protein. This variant is predicted to disrupt the electrostatic interaction of GCP2 with GCP3. In primary fibroblasts carrying the variant, we observed a faint delocalization of gamma-tubulin during the cell cycle but normal GCP2 protein levels. Through mass spectrometry, we observed dysregulation of multiple proteins involved in the assembly and organization of the cytoskeleton and the extracellular matrix, controlling cellular adhesion and of proteins crucial for neuronal homeostasis including axon guidance. In summary, our functional and proteomic studies link TUBGCP2 and the gamma-tubulin complex to the development of the central nervous system in humans.