A novel, likely pathogenic variant in UBTF‐related neurodegeneration with brain atrophy is associated with a severe divergent neurodevelopmental phenotype

Autor: Rory J. Tinker, Tiffany Guess, David C. Rinker, Jonathan H. Sheehan, Daniel Lubarsky, Binu Porath, Mackenzie Mosera, Ping Mayo, Emily Solem, Laura A. Lee, Asha Sarma, Jennifer Brault
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Molecular Genetics & Genomic Medicine, Vol 10, Iss 12, Pp n/a-n/a (2022)
Druh dokumentu: article
ISSN: 2324-9269
DOI: 10.1002/mgg3.2054
Popis: Abstract Background A de novo, pathogenic, missense variant in UBTF, c.628G>A p.Glu210Lys, has been described as the cause of an emerging neurodegenerative disorder, Childhood‐Onset Neurodegeneration with Brain Atrophy (CONDBA). The p.Glu210Lys alteration yields a positively charged stretch of three lysine residues. Functional studies confirmed this change results in a stronger interaction with negatively charged DNA and gain‐of‐function activity when compared to the wild‐type sequence. The CONDBA phenotype reported in association with p.Glu210Lys consists of normal early‐neurodevelopment followed by progressive motor, cognitive, and behavioral regression in early‐to‐middle childhood. Methods and Results The current proband presented at 9 months of age with baseline developmental delay and more extensive neuroradiological findings, including pontine hypoplasia, thalamic volume loss and signal abnormality, and hypomyelination. Like the recurrent CONDBA p.Glu210Lys variant, this novel variant, c.608A>G p.(Gln203Arg) lies within the highly conserved second HMG‐box homology domain and involves the replacement of the wild‐type residue with a positively charged residue, arginine. Computational structural modeling demonstrates that this amino acid substitution potentiates the interaction between UBTF and DNA, likely resulting in a gain‐of‐function effect for the UBTF protein, UBF. Conclusion Here we present a new divergent phenotype associated with a novel, likely pathogenic, missense variant at a different position in the UBTF gene, c.608A>G p.(Gln203Arg).
Databáze: Directory of Open Access Journals
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