Defects of mutant DNMT1 are linked to a spectrum of neurological disorders
| العنوان: | Defects of mutant DNMT1 are linked to a spectrum of neurological disorders |
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| المؤلفون: | Georges Mer, Kaori Hojo, Shana L. Merrill, Jessica Deleon, Peter Van den Bergh, Maria Victoria Botuyan, Noah Beadell, Inès Mademan, Christopher J. Klein, Gregory A. Worrell, Yanhong Wu, Henry Houlden, Nicole McGrath, Jan Senderek, Gordon Smith, Jonathan Baets, Xiaohui Duan, Mary M. Reilly, Julie Khoury, Murray Grossman, Joachim Weis, Matilde Laura, William W. Seeley, Steven S. Scherer, Peter De Jonghe, Yo Tsen Liu, Peter J. Dyck |
| المصدر: | Brain |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | Adult, DNA (Cytosine-5-)-Methyltransferase 1, Male, Bioinformatics, medicine.disease_cause, environment and public health, Protein Structure, Secondary, 03 medical and health sciences, 0302 clinical medicine, Autosomal dominant cerebellar ataxia, Hereditary sensory and autonomic neuropathy, medicine, Autophagy, Humans, DNA (Cytosine-5-)-Methyltransferases, Cognitive decline, Hereditary Sensory and Autonomic Neuropathies, Cognitive deficit, Cellular localization, 030304 developmental biology, Aged, Genetics, 0303 health sciences, Mutation, Cerebellar ataxia, urogenital system, Original Articles, Middle Aged, medicine.disease, 3. Good health, Pedigree, HEK293 Cells, embryonic structures, Female, Neurology (clinical), Human medicine, medicine.symptom, Nervous System Diseases, Psychology, 030217 neurology & neurosurgery, Narcolepsy |
| الوصف: | Baets et al. expand the clinical spectrum of hereditary sensory and autonomic neuropathy type 1E (HSAN1E) by studying nine newly identified kinships, and reveal a potential pathogenic mechanism for causative DNMT1 mutations. Mutant DNMT1 proteins form aggresomes in the cytoplasm, suggesting that aggresome-induced autophagy may contribute to disease pathogenesis.We report a broader than previously appreciated clinical spectrum for hereditary sensory and autonomic neuropathy type 1E (HSAN1E) and a potential pathogenic mechanism for DNA methyltransferase (DNMT1) mutations. The clinical presentations and genetic characteristics of nine newly identified HSAN1E kinships (45 affected subjects) were investigated. Five novel mutations of DNMT1 were discovered; p.C353F, p.T481P, p.P491L, p.Y524D and p.I531N, all within the target-sequence domain, and two mutations (p.T481P, p.P491L) arising de novo. Recently, HSAN1E has been suggested as an allelic disorder of autosomal dominant cerebellar ataxia, deafness and narcolepsy. Our results indicate that all the mutations causal for HSAN1E are located in the middle part or N-terminus end of the TS domain, whereas all the mutations causal for autosomal dominant cerebellar ataxia, deafness and narcolepsy are located in the C-terminus end of the TS domain. The impact of the seven causal mutations in this cohort was studied by cellular localization experiments. The binding efficiency of the mutant DNMT proteins at the replication foci and heterochromatin were evaluated. Phenotypic characterizations included electromyography, brain magnetic resonance and nuclear imaging, electroencephalography, sural nerve biopsies, sleep evaluation and neuropsychometric testing. The average survival of HSAN1E was 53.6 years. [standard deviation = 7.7, range 43-75 years], and mean onset age was 37.7 years. (standard deviation = 8.6, range 18-51 years). Expanded phenotypes include myoclonic seizures, auditory or visual hallucinations, and renal failure. Hypersomnia, rapid eye movement sleep disorder and/or narcolepsy were identified in 11 subjects. Global brain atrophy was found in 12 of 14 who had brain MRI. EEGs showed low frequency (delta waves) frontal-predominant abnormality in five of six patients. Marked variability in cognitive deficits was observed, but the majority of patients (89%) developed significant cognitive deficit by the age of 45 years. Cognitive function decline often started with personality changes and psychiatric manifestations. A triad of hearing loss, sensory neuropathy and cognitive decline remains as the stereotypic presentation of HSAN1E. Moreover, we show that mutant DNMT1 proteins translocate to the cytoplasm and are prone to form aggresomes while losing their binding ability to heterochromatin during the G2 cell cycle. Our results suggest mutations in DNMT1 result in imbalanced protein homeostasis through aggresome-induced autophagy. This mechanism may explain why mutations in the sole DNA maintenance methyltransferase lead to selective central and peripheral neurodegeneration. |
| تدمد: | 1460-2156 0006-8950 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::98f4def148fad12e85799ea261ea18ddTest https://pubmed.ncbi.nlm.nih.gov/25678562Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....98f4def148fad12e85799ea261ea18dd |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14602156 00068950 |
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