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Journal Articles Frontiers in Cell and Developmental Biology Year : 2022

The different clinical facets of SYN1-related neurodevelopmental disorders

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Ilaria Parenti
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Elsa Leitão
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Alma Kuechler
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Cyril Goizet
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Cécile Courdier
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Allan Bayat
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Alessandra Rossi
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Sophie Julia
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Ange-Line Bruel
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Frédéric Tran Mau-Them
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Sophie Nambot
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Daphné Lehalle
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Marjolaine Willems
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James Lespinasse
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Jamal Ghoumid
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Roseline Caumes
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Thomas Smol
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Salima El Chehadeh
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Elise Schaefer
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Marie-Thérèse Abi-Warde
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Boris Keren
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Alexandra Afenjar
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Anne-Claude Tabet
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Jonathan Levy
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Anna Maruani
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Ángel Aledo-Serrano
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Waltraud Garming
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Clara Milleret-Pignot
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Anna Chassevent
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Marije Koopmans
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Nienke Verbeek
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Richard Person
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Rebecca Belles
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Gary Bellus
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Bonnie Salbert
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Frank Kaiser
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Laure Mazzola
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Philippe Convers
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Laurine Perrin
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Amélie Piton
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Gert Wiegand
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Andrea Accogli
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Francesco Brancati
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Fabio Benfenati
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Nicolas Chatron
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David Lewis-Smith
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Rhys Thomas
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Federico Zara
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Pasquale Striano
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Gaetan Lesca
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Christel Depienne
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Abstract

Synapsin-I (SYN1) is a presynaptic phosphoprotein crucial for synaptogenesis and synaptic plasticity. Pathogenic SYN1 variants are associated with variable X-linked neurodevelopmental disorders mainly affecting males. In this study, we expand on the clinical and molecular spectrum of the SYN1 -related neurodevelopmental disorders by describing 31 novel individuals harboring 22 different SYN1 variants. We analyzed newly identified as well as previously reported individuals in order to define the frequency of key features associated with these disorders. Specifically, behavioral disturbances such as autism spectrum disorder or attention deficit hyperactivity disorder are observed in 91% of the individuals, epilepsy in 82%, intellectual disability in 77%, and developmental delay in 70%. Seizure types mainly include tonic-clonic or focal seizures with impaired awareness. The presence of reflex seizures is one of the most representative clinical manifestations related to SYN1 . In more than half of the cases, seizures are triggered by contact with water, but other triggers are also frequently reported, including rubbing with a towel, fever, toothbrushing, fingernail clipping, falling asleep, and watching others showering or bathing. We additionally describe hyperpnea, emotion, lighting, using a stroboscope, digestive troubles, and defecation as possible triggers in individuals with SYN1 variants. The molecular spectrum of SYN1 variants is broad and encompasses truncating variants (frameshift, nonsense, splicing and start-loss variants) as well as non-truncating variants (missense substitutions and in-frame duplications). Genotype-phenotype correlation revealed that epileptic phenotypes are enriched in individuals with truncating variants. Furthermore, we could show for the first time that individuals with early seizures onset tend to present with severe-to-profound intellectual disability, hence highlighting the existence of an association between early seizure onset and more severe impairment of cognitive functions. Altogether, we present a detailed clinical description of the largest series of individuals with SYN1 variants reported so far and provide the first genotype-phenotype correlations for this gene. A timely molecular diagnosis and genetic counseling are cardinal for appropriate patient management and treatment.

Dates and versions

hal-03949582 , version 1 (20-01-2023)

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Cite

Ilaria Parenti, Elsa Leitão, Alma Kuechler, Laurent Villard, Cyril Goizet, et al.. The different clinical facets of SYN1-related neurodevelopmental disorders. Frontiers in Cell and Developmental Biology, 2022, 10, ⟨10.3389/fcell.2022.1019715⟩. ⟨hal-03949582⟩

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