1
|
Luppe J, Sticht H, Lecoquierre F, Goldenberg A, Gorman KM, Molloy B, Agolini E, Novelli A, Briuglia S, Kuismin O, Marcelis C, Vitobello A, Denommé-Pichon AS, Julia S, Lemke JR, Abou Jamra R, Platzer K. Heterozygous and homozygous variants in STX1A cause a neurodevelopmental disorder with or without epilepsy. Eur J Hum Genet 2023; 31:345-352. [PMID: 36564538 PMCID: PMC9995539 DOI: 10.1038/s41431-022-01269-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 11/24/2022] [Accepted: 12/08/2022] [Indexed: 12/24/2022] Open
Abstract
The neuronal SNARE complex drives synaptic vesicle exocytosis. Therefore, one of its core proteins syntaxin 1A (STX1A) has long been suspected to play a role in neurodevelopmental disorders. We assembled eight individuals harboring ultra rare variants in STX1A who present with a spectrum of intellectual disability, autism and epilepsy. Causative variants comprise a homozygous splice variant, three de novo missense variants and two inframe deletions of a single amino acid. We observed a phenotype mainly driven by epilepsy in the individuals with missense variants in contrast to intellectual disability and autistic behavior in individuals with single amino acid deletions and the splicing variant. In silico modeling of missense variants and single amino acid deletions show different impaired protein-protein interactions. We hypothesize the two phenotypic courses of affected individuals to be dependent on two different pathogenic mechanisms: (1) a weakened inhibitory STX1A-STXBP1 interaction due to missense variants results in an STX1A-related developmental epileptic encephalopathy and (2) a hampered SNARE complex formation due to inframe deletions causes an STX1A-related intellectual disability and autism phenotype. Our description of a STX1A-related neurodevelopmental disorder with or without epilepsy thus expands the group of rare diseases called SNAREopathies.
Collapse
Affiliation(s)
- Johannes Luppe
- Institute of Human Genetics, University of Leipzig Medical Center, Leipzig, Germany
| | - Heinrich Sticht
- Institute of Biochemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - François Lecoquierre
- Department of Genetics and Reference Center for Developmental Disorders, Normandie Univ, UNIROUEN, CHU Rouen, Inserm U1245, FHU G4 Génomique, F-76000, Rouen, France
| | - Alice Goldenberg
- Department of Genetics and Reference Center for Developmental Disorders, Normandie Univ, UNIROUEN, CHU Rouen, Inserm U1245, FHU G4 Génomique, F-76000, Rouen, France
| | - Kathleen M Gorman
- Department of Neurology and Clinical Neurophysiology, Children's Health Ireland at Temple Street, Dublin, Ireland
- School of Medicine and Medical Science, University College Dublin, Dublin, Ireland
| | | | - Emanuele Agolini
- Laboratory of Medical Genetics, Bambino Gesù Children Hospital IRCCS, Rome, Italy
| | - Antonio Novelli
- Laboratory of Medical Genetics, Bambino Gesù Children Hospital IRCCS, Rome, Italy
| | - Silvana Briuglia
- Department of Biomedical, Dental, Morphological and Functional Imaging Sciences, University of Messina, Messina, Italy
| | - Outi Kuismin
- Institute for Molecular Medicine Finland, Helsinki, Finland
| | - Carlo Marcelis
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, Netherlands
| | - Antonio Vitobello
- Inserm UMR1231 GAD, University of Burgundy-Franche Comté, Dijon, France
| | | | - Sophie Julia
- Federative Institute of Biology, CHU de Toulouse, Toulouse, France
| | - Johannes R Lemke
- Institute of Human Genetics, University of Leipzig Medical Center, Leipzig, Germany
- Center for Rare Diseases, University of Leipzig Medical Center, Leipzig, Germany
| | - Rami Abou Jamra
- Institute of Human Genetics, University of Leipzig Medical Center, Leipzig, Germany
| | - Konrad Platzer
- Institute of Human Genetics, University of Leipzig Medical Center, Leipzig, Germany.
| |
Collapse
|