De novo variants in ATP2B1 lead to neurodevelopmental delay

Meer Jacob Rahimi, Nicole Urban, Meret Wegler, Heinrich Sticht, Michael Schaefer, Bernt Popp, Frank Gaunitz, Manuela Morleo, Vincenzo Nigro, Silvia Maitz, Grazia M S Mancini, Claudia Ruivenkamp, Eun-Kyung Suk, Tobias Bartolomaeus, Andreas Merkenschlager, Daniel Koboldt, Dennis Bartholomew, Alexander P A Stegmann, Margje Sinnema, Irma DuynisveldRamona Salvarinova, Simone Race, Bert B A de Vries, Aurélien Trimouille, Sophie Naudion, Daphna Marom, Uri Hamiel, Noa Henig, Florence Demurger, Nils Rahner, Enrika Bartels, J Austin Hamm, Abbey M Putnam, Richard Person, Rami Abou Jamra, Henry Oppermann*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Calcium (Ca2+) is a universal second messenger involved in synaptogenesis and cell survival; consequently, its regulation is important for neurons. ATPase plasma membrane Ca2+ transporting 1 (ATP2B1) belongs to the family of ATP-driven calmodulin-dependent Ca2+ pumps that participate in the regulation of intracellular free Ca2+. Here, we clinically describe a cohort of 12 unrelated individuals with variants in ATP2B1 and an overlapping phenotype of mild to moderate global development delay. Additional common symptoms include autism, seizures, and distal limb abnormalities. Nine probands harbor missense variants, seven of which were in specific functional domains, and three individuals have nonsense variants. 3D structural protein modeling suggested that the variants have a destabilizing effect on the protein. We performed Ca2+ imaging after introducing all nine missense variants in transfected HEK293 cells and showed that all variants lead to a significant decrease in Ca2+ export capacity compared with the wild-type construct, thus proving their pathogenicity. Furthermore, we observed for the same variant set an incorrect intracellular localization of ATP2B1. The genetic findings and the overlapping phenotype of the probands as well as the functional analyses imply that de novo variants in ATP2B1 lead to a monogenic form of neurodevelopmental disorder.

Original languageEnglish
Pages (from-to)944-952
Number of pages9
JournalAmerican Journal of Human Genetics
Volume109
Issue number5
Early online date25 Mar 2022
DOIs
Publication statusPublished - 5 May 2022

Keywords

  • BINDING
  • CA2+
  • EXPRESSION
  • HOMEOSTASIS
  • HOUSEKEEPING FUNCTION
  • INTELLECTUAL DISABILITY
  • ISOFORMS
  • MUTATION
  • PLASMA-MEMBRANE CA2+-ATPASE

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