Loss-of-Function Variants in CUL3 Cause a Syndromic Neurodevelopmental Disorder
- PMID: 39301775
- PMCID: PMC11922793
- DOI: 10.1002/ana.27077
Loss-of-Function Variants in CUL3 Cause a Syndromic Neurodevelopmental Disorder
Abstract
Objective: De novo variants in cullin-3 ubiquitin ligase (CUL3) have been strongly associated with neurodevelopmental disorders (NDDs), but no large case series have been reported so far. Here, we aimed to collect sporadic cases carrying rare variants in CUL3, describe the genotype-phenotype correlation, and investigate the underlying pathogenic mechanism.
Methods: Genetic data and detailed clinical records were collected via multicenter collaboration. Dysmorphic facial features were analyzed using GestaltMatcher. Variant effects on CUL3 protein stability were assessed using patient-derived T-cells.
Results: We assembled a cohort of 37 individuals with heterozygous CUL3 variants presenting a syndromic NDD characterized by intellectual disability with or without autistic features. Of these, 35 have loss-of-function (LoF) and 2 have missense variants. CUL3 LoF variants in patients may affect protein stability leading to perturbations in protein homeostasis, as evidenced by decreased ubiquitin-protein conjugates in vitro. Notably, we show that 4E-BP1 (EIF4EBP1), a prominent substrate of CUL3, fails to be targeted for proteasomal degradation in patient-derived cells.
Interpretation: Our study further refines the clinical and mutational spectrum of CUL3-associated NDDs, expands the spectrum of cullin RING E3 ligase-associated neuropsychiatric disorders, and suggests haploinsufficiency via LoF variants is the predominant pathogenic mechanism. ANN NEUROL 2024.
© 2024 American Neurological Association.
Conflict of interest statement
Potential Conflicts of Interest
Nothing to report.
Update of
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Loss-of-function variants in CUL3 cause a syndromic neurodevelopmental disorder.medRxiv [Preprint]. 2023 Jun 16:2023.06.13.23290941. doi: 10.1101/2023.06.13.23290941. medRxiv. 2023. Update in: Ann Neurol. 2024 Sep 20. doi: 10.1002/ana.27077. PMID: 37398376 Free PMC article. Updated. Preprint.
References
-
- Tarpey PS, Raymond FL, O’Meara S, et al. Mutations in CUL4B, Which Encodes a Ubiquitin E3 Ligase Subunit, Cause an X-linked Mental Retardation Syndrome Associated with Aggressive Outbursts, Seizures, Relative Macrocephaly, Central Obesity, Hypogonadism, Pes Cavus, and Tremor. Am J Hum Genetics 2007;80(2):345–352. - PMC - PubMed
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- Huber C, Dias-Santagata D, Glaser A, et al. Identification of mutations in CUL7 in 3- M syndrome. Nat Genet 2005;37(10):1119–1124. - PubMed
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