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| Item Type: | Article |
|---|---|
| Title: | Loss-of-function variants in DNM1 cause a specific form of developmental and epileptic encephalopathy only in biallelic state |
| Creators Name: | Yigit, G. and Sheffer, R. and Daana, M. and Li, Y. and Kaygusuz, E. and Mor-Shakad, H. and Altmüller, J. and Nürnberg, P. and Douiev, L. and Kaulfuss, S. and Burfeind, P. and Wollnik, B. and Brockmann, K. |
| Abstract: | BACKGROUND: Developmental and epileptic encephalopathies (DEEs) represent a group of severe neurological disorders characterised by an onset of refractory seizures during infancy or early childhood accompanied by psychomotor developmental delay or regression. DEEs are genetically heterogeneous with, to date, more than 80 different genetic subtypes including DEE31 caused by heterozygous missense variants in DNM1. METHODS: We performed a detailed clinical characterisation of two unrelated patients with DEE and used whole-exome sequencing to identify causative variants in these individuals. The identified variants were tested for cosegregation in the respective families. RESULTS: We excluded pathogenic variants in known, DEE-associated genes. We identified homozygous nonsense variants, c.97C>T; p.(Gln33*) in family 1 and c.850C>T; p.(Gln284*) in family 2, in the DNM1 gene, indicating that biallelic, loss-of-function pathogenic variants in DNM1 cause DEE. CONCLUSION: Our finding that homozygous, loss-of-function variants in DNM1 cause DEE expands the spectrum of pathogenic variants in DNM1. All parents who were heterozygous carriers of the identified loss-of-function variants were healthy and did not show any clinical symptoms, indicating that the type of mutation in DNM1 determines the pattern of inheritance. |
| Keywords: | Brain Diseases, Heterozygote, Missense Mutation, Mutation, Whole Exome Sequencing |
| Source: | Journal of Medical Genetics |
| ISSN: | 0022-2593 |
| Publisher: | BMJ Publishing Group |
| Volume: | 59 |
| Number: | 6 |
| Page Range: | 549-553 |
| Date: | 20 May 2022 |
| Official Publication: | https://doi.org/10.1136/jmedgenet-2021-107769 |
| PubMed: | View item in PubMed |
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