Cited by 71Genomics and Rare DiseasesGenetics and Neurodevelopmental DisordersEpilepsy research and treatment

Mutations in HECW2 are associated with intellectual disability and epilepsy

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Halvardson, Jonatan, Zhao, Jin J, Zaghlool, Ammar, Wentzel, Christian, Georgii-Hemming, Patrik, Månsson, Else, Ederth Sävmarker, Helena, Brandberg, Göran +3 more·2016·Journal of Medical Genetics

Abstract

Background: De novo mutations are a frequent cause of disorders related to brain development. We report the results of screening patients diagnosed with both epilepsy and intellectual disability (ID) using exome sequencing to identify known and new causative de novo mutations relevant to these conditions. Methods: Exome sequencing was performed on 39 patient–parent trios to identify de novo mutations. Clinical significance of de novo mutations in genes was determined using the American College of Medical Genetics and Genomics standard guidelines for interpretation of coding variants. Variants in genes of unknown clinical significance were further analysed in the context of previous trio sequencing efforts in neurodevelopmental disorders. Results: In 39 patient–parent trios we identified 29 de novo mutations in coding sequence. Analysis of de novo and inherited variants yielded a molecular diagnosis in 11 families (28.2%). In combination with previously published exome sequencing results in neurodevelopmental disorders, our analysis implicates HECW2 as a novel candidate gene in ID and epilepsy. Conclusions: Our results support the use of exome sequencing as a diagnostic approach for ID and epilepsy, and confirm previous results regarding the importance of de novo mutations in this patient group. The results also highlight the utility of network analysis and comparison to previous large-scale studies as strategies to prioritise candidate genes for further studies. This study adds knowledge to the increasingly growing list of causative and candidate genes in ID and epilepsy and highlights HECW2 as a new candidate gene for neurodevelopmental disorders.

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  • The prevalence of ASD in several ID/DD-ascertained cohorts is not quantified, and the prevalence of ID in ASD-ascertained cohorts is known only for a minority subset of participants.

    “Because of this bias, the phenotypic overlap between the groups is unclear; the prevalence of ASD in several of the ID/DD-ascertained cohorts is not quantified,13, 14, 15,18,19 and the prevalence of ID in the ASD-ascertained cohorts is known only for a minority subset of participants.11,12”

    From Insufficient Evidence for “Autism-Specific” Genes (2020) · cites this paper as [19]

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  1. [2]Bell GS, Sander JW The epidemiology of epilepsy: the size of the problem. Seizure 2002; 11 (Suppl A): 306– 14; quiz 315–16. 12185766

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Authors
Halvardson, J., Zhao, J. J., Zaghlool, A., Wentzel, C., Georgii-Hemming, P., Månsson, E., Ederth Sävmarker, H., Brandberg, G., Soussi Zander, C., Thuresson, A.-C., & Feuk, L.
Affiliations
  • Uppsala University (SE)
  • Department of Immunology, Genetics and Pathology, Science for Life Laboratory Uppsala, Uppsala University, Uppsala, Sweden
  • Örebro University Hospital (SE)
  • Department of Pediatrics, Gävle Hospital, Gävle, Sweden
  • Pediatric Clinic, Falun, Sweden
Corresponding author
Feuk, Lars
Venue
Journal of Medical Genetics
Publisher
BMJ
Published
2016-06-22
Volume
53
Issue
10
Pages
697-704
ISSN
  • 0022-2593 (ISSN-L)
  • 1468-6244
OpenAlex
W2465916929
Cited by
71
References
46
Citations by year
2026: 3 · 2025: 11 · 2024: 2 · 2023: 2 · 2022: 14 · 2021: 10 · 2020: 8 · 2019: 6 · 2018: 8 · 2017: 7
FWCI
5.66
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Journal of Medical Genetics (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Uppsala University Publications (Uppsala University) (submittedVersion, other-oa)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • Norges Forskningsråd
  • Science for Life Laboratory
  • Medical Research Council
  • Uppsala Multidisciplinary Center for Advanced Computational Science
  • National Institute of General Medical Sciences (R01GM097376)
  • FP7 Ideas: European Research Council (282330)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomics and Rare Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Health Sciences › Medicine › Psychiatry and Mental health › Epilepsy research and treatment
Keywords
HECW2, intellectual disability, epilepsy, de novo mutations, neurodevelopmental disorders, candidate genes, molecular diagnosis, exome sequencing, network analysis, variants of uncertain significance
MeSH terms
DNA Mutational Analysis, Epilepsy, Female, Humans, Male, Intellectual Disability, Mutation, Syndrome, Ubiquitin-Protein Ligases, Exome

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