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DNMT1-associated sensory neuropathy and cerebellar ataxia: A novel variant and review of genotype-phenotype correlation. | LitMetric

AI Article Synopsis

Article Abstract

Aim: Hereditary sensory neuropathy (HSN) 1E is a neurodegenerative disorder caused by pathogenic variants in DNA methyltransferase 1 (DNMT1). It is characterised by sensorineural deafness, sensory neuropathy and cognitive decline. Variants in DNMT1 are also associated with autosomal dominant cerebellar ataxia, deafness and narcolepsy.

Methods: A 42-year-old man presented with imbalance, lancinating pain, numerous paucisymptomatic injuries, progressive deafness since his mid-20s, mild cognitive decline and apathy. Examination revealed abnormalities of eye movements, distal sensory loss to all modalities, areflexia without weakness and lower limb ataxia. MRI brain and FDG-PET scan demonstrated biparietal and cerebellar atrophy/hypometabolism. Whole exome sequencing detected a heterozygous likely pathogenic missense variant in DNMT1, c.1289G > A, p.Cys430Tyr. Cochlear implant was performed at 44 years for the bilateral high frequency sensorineural hearing loss with improvement in hearing and day-to-day function.

Results And Conclusion: We describe a novel variant in DNMT1 and confirm that an overlapping HSN1E-cerebellar phenotype can occur. Only one prior case of cochlear implant in HSN1E has been reported to date but this case adds to that literature, suggesting that cochlear implant can be successful in such patients. We further explore the clinical and radiological signature of the cognitive syndrome associated with this disorder.

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Source
http://dx.doi.org/10.1111/jns.12560DOI Listing

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