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1
Improving Access to Health Services in French: The Power of Networking and Knowledge Mobilization, a Proven Canadian Model
Tremblay, Michel; Leis, Anne. - : Institut canadien de recherche sur les minorités linguistiques / Canadian Institute for Research on Linguistic Minorities, 2021. : Érudit, 2021
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2
A recurrent de novo missense mutation in UBTF causes developmental neuroregression
Abstract: UBTF (upstream binding transcription factor) exists as two isoforms; UBTF1 regulates rRNA transcription by RNA polymerase 1, whereas UBTF2 regulates mRNA transcription by RNA polymerase 2. Herein, we describe 4 patients with very similar patterns of neuroregression due to recurrent de novo mutations in UBTF (GRCh37/hg19, NC_000017.10: g.42290219C > T, NM_014233.3: c.628G > A) resulting in the same amino acid change in both UBTF1 and UBTF2 (p.Glu210Lys [p.E210K]). Disease onset in our cohort was at 2.5 to 3 years and characterized by slow progression of global motor, cognitive and behavioral dysfunction. Notable early features included hypotonia with a floppy gait, high-pitched dysarthria and hyperactivity. Later features included aphasia, dystonia, and spasticity. Speech and ambulatory ability were lost by the early teens. Magnetic resonance imaging showed progressive generalized cerebral atrophy (supratentorial > infratentorial) with involvement of both gray and white matter. Patient fibroblasts showed normal levels of UBTF transcripts, increased expression of pre-rRNA and 18S rRNA, nucleolar abnormalities, markedly increased numbers of DNA breaks, defective cell-cycle progression, and apoptosis. Expression of mutant human UBTF1 in Drosophila neurons was lethal. Although no loss-of-function variants are reported in the Exome Aggregation Consortium (ExAC) database and Ubtf−/− is early embryonic lethal in mice, Ubtf+/− mice displayed only mild motor and behavioral dysfunction in adulthood. Our data underscore the importance of including UBTF E210K in the differential diagnosis of neuroregression and suggest that mainly gain-of-function mechanisms contribute to the pathogenesis of the UBTF E210K neuroregression syndrome.
Keyword: Articles
URL: https://doi.org/10.1093/hmg/ddx435
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5886272/
http://www.ncbi.nlm.nih.gov/pubmed/29300972
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3
Antitumor Activity and Mechanism of Action of the Cyclopenta[b]benzofuran, Silvestrol
Cencic, Regina; Carrier, Marilyn; Galicia-Vázquez, Gabriela. - : Public Library of Science, 2009
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4
The impact of attending to unstressed words on the acquisition of written grammatical morphology by French-speaking ESL students
In: Canadian modern language review. - Toronto : Ontario Modern Language Teachers Association 58 (2002) 3, 364-385
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5
The Impact of Attending to Unstressed Words on the Acquisition of Written Grammatical Morphology by French-Speaking ESL Students
In: Canadian modern language review. - Toronto : Ontario Modern Language Teachers Association 58 (2002) 3, 364-385
OLC Linguistik
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