Werren, Elizabeth A;
Rodriguez Bey, Guillermo;
Majethia, Purvi;
Kaur, Parneet;
Patil, Siddaramappa J;
Kekatpure, Minal;
Afenjar, Alexandra;
... Shukla, Anju; + view all
(2024)
Biallelic EPB41L3 variants underlie a developmental disorder with seizures and myelination defects.
Brain
, 147
(12)
pp. 4033-4042.
10.1093/brain/awae299.
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Abstract
Erythrocyte Membrane Protein Band 4.1 Like 3 (EPB41L3: NM_012307.5), also known as DAL-1, encodes the ubiquitously expressed, neuronally enriched 4.1B protein, part of the 4.1 superfamily of membrane-cytoskeleton adaptors. 4.1B plays key roles in cell spreading, migration, and cytoskeletal scaffolding that support oligodendrocyte axon adhesions essential for proper myelination. We herein describe six individuals from five unrelated families with global developmental delay, intellectual disability, seizures, hypotonia, neuroregression, and delayed myelination. Exome sequencing identified biallelic variants in EPB41L3 in all affected individuals: two nonsense (c.466C>T, p.(R156*); c.2776C>T, p.(R926*)) and three frameshift (c.666delT, p.(F222Lfs*46); c.2289dupC, p.(V764Rfs*19); c.948_949delTG, p.(A317Kfs*33)). Quantitative-real time PCR and Western blot analysis in human fibroblasts harbouring EPB41L3:c.666delT, p.(F222Lfs*46) indicate ablation of EPB41L3 mRNA and 4.1B protein expression. Inhibition of the nonsense mediated decay (NMD) pathway led to an upregulation of EPB41L3:c.666delT transcripts, supporting NMD as a pathogenic mechanism. Epb41l3-deficient mouse oligodendroglia cells showed significant reduction in mRNA expression of key myelin genes, reduced branching, and increased apoptosis. Our report provides the first clinical description of an autosomal recessive disorder associated with variants in EPB41L3, which we refer to as EPB41L3-associated developmental disorder (EADD). Moreover, our functional studies substantiate the pathogenicity of EPB41L3 hypothesized loss-of-function variants.
| Type: | Article |
|---|---|
| Title: | Biallelic EPB41L3 variants underlie a developmental disorder with seizures and myelination defects |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/brain/awae299 |
| Publisher version: | http://dx.doi.org/10.1093/brain/awae299 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | 4.1B, neurodevelopmental disorder, loss-of-function, delayed myelination, oligodendroglia |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Department of Neuromuscular Diseases |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10197869 |
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