De novo stop-loss variants in CLDN11 cause hypomyelinating leukodystrophy

Riedhammer, Korbinian M.; Stockler, Sylvia; Ploski, Rafal; Wenzel, Maren; Adis-Dutschmann, Burkhard; Ahting, Uwe; Alhaddad, Bader; Blaschek, Astrid; Haack, Tobias B.; Kopajtich, Robert; Lee, Jessica; Pienkowski, Victor Murcia; Pollak, Agnieszka; Szymanska, Krystyna; Tarailo-Graovac, Maja; Lee, Robin van der; Karnebeek, Clara D. van; Meitinger, Thomas; Krageloh-Mann, Ingeborg und Vill, Katharina (2021): De novo stop-loss variants in CLDN11 cause hypomyelinating leukodystrophy. In: Brain, Bd. 144: S. 411-419

Abstract

Claudin-11, a tight junction protein, is indispensable in the formation of the radial component of myelin. Here, we report de novo stop-loss variants in the gene encoding claudin-11, CLDN11, in three unrelated individuals presenting with an early-onset spastic movement disorder, expressive speech disorder and eye abnormalities including hypermetropia. Brain MRI showed a myelin deficit with a discrepancy between T-1-weighted and T-2-weighted images and some progress in myelination especially involving the central and peripheral white matter. Exome sequencing identified heterozygous stop-loss variants c.622T>C, p.(*208Glnext*39) in two individuals and c.622T>G, p.(*208Gluext*39) in one individual, all occurring de novo. At the RNA level, the variant c.622T>C did not lead to a loss of expression in fibroblasts, indicating this transcript is not subject to nonsense-mediated decay and most likely translated into an extended protein. Extended claudin-11 is predicted to form an alpha helix not incorporated into the cytoplasmic membrane, possibly perturbing its interaction with intracellular proteins. Our observations suggest that stop-loss variants in CLDN11 expand the genetically heterogeneous spectrum of hypomyelinating leukodystrophies.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 0006-8950
• Sprache: Englisch