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Two different clinical phenotypes of Creutzfeldt-Jakob disease with a M232R substitution

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Abstract

Objective

To describe the clinical features of Creutzfeldt-Jakob disease with a substitution of arginine for methionine (M232R substitution) at codon 232 (CJD232) of the prion protein gene (PRNP).

Patients and methods

We evaluated the clinical and laboratory features of 20 CJD232 patients: age of onset, initial symptoms, duration until becoming akinetic and mute, duration until occurrence of periodic sharp and wave complexes on EEG (PSWC), MRI findings, and the presence of CSF 14-3-3 protein. Immunohistochemically, prion protein (PrP) deposition was studied.

Results

None of the patients had a family history of CJD. We recognized two clinical phenotypes: a rapidly progressive type (rapidtype) and a slowly progressive type (slow-type). Out of 20 patients, 15 became akinetic and mute, demonstrated myoclonus, and showed PSWC within a mean duration of 3.1, 2.4, and 2.8 months, respectively (rapid-type). Five showed slowly progressive clinical courses (slow-type). Five became akinetic and mute and four demonstrated myoclonus within a mean duration of 20.6 and 15.3 months, respectively, which were significantly longer than those in the rapid-type. Only one demonstrated PSWC 13 months after the onset. Diffuse synaptic-type deposition was demonstrated in four rapidtype patients, and perivacuolar and diffuse synaptic-type deposition in two, and diffuse synaptic-type deposition in one slow-type patient. Three of 50 suspected but non-CJD patients had the M232R substitution.

Conclusions

Patients with CJD232 had no family history like patients with sCJD, and showed two different clinical phenotypes in spite of having the same PRNP genotype. More studies are needed to determine whether M232R substitution causes the disease and influences the disease progression.

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Correspondence to Y. Shiga* MD, PhD.

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* The Creutzfeldt-Jakob Disease Surveillance Committee, Japan.

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Shiga*, Y., Satoh, K., Kitamoto*, T. et al. Two different clinical phenotypes of Creutzfeldt-Jakob disease with a M232R substitution. J Neurol 254, 1509–1517 (2007). https://doi.org/10.1007/s00415-007-0540-9

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  • DOI: https://doi.org/10.1007/s00415-007-0540-9

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