Myoclonus in mitochondrial disorders

ABSTRACT Myoclonus is a possible manifestation of mitochondrial disorders, and its presence is considered, in association with epilepsy and the ragged red fibers, pivotal for the syndromic diagnosis of MERRF (myoclonic epilepsy with ragged red fibers). However, its prevalence in mitochondrial diseas...

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Veröffentlicht in:Movement disorders 2014-05, Vol.29 (6), p.722-728
Hauptverfasser: Mancuso, Michelangelo, Orsucci, Daniele, Angelini, Corrado, Bertini, Enrico, Catteruccia, Michela, Pegoraro, Elena, Carelli, Valerio, Valentino, Maria L., Comi, Giacomo P., Minetti, Carlo, Bruno, Claudio, Moggio, Maurizio, Ienco, Elena Caldarazzo, Mongini, Tiziana, Vercelli, Liliana, Primiano, Guido, Servidei, Serenella, Tonin, Paola, Scarpelli, Mauro, Toscano, Antonio, Musumeci, Olimpia, Moroni, Isabella, Uziel, Graziella, Santorelli, Filippo M., Nesti, Claudia, Filosto, Massimiliano, Lamperti, Costanza, Zeviani, Massimo, Siciliano, Gabriele
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container_end_page 728
container_issue 6
container_start_page 722
container_title Movement disorders
container_volume 29
creator Mancuso, Michelangelo
Orsucci, Daniele
Angelini, Corrado
Bertini, Enrico
Catteruccia, Michela
Pegoraro, Elena
Carelli, Valerio
Valentino, Maria L.
Comi, Giacomo P.
Minetti, Carlo
Bruno, Claudio
Moggio, Maurizio
Ienco, Elena Caldarazzo
Mongini, Tiziana
Vercelli, Liliana
Primiano, Guido
Servidei, Serenella
Tonin, Paola
Scarpelli, Mauro
Toscano, Antonio
Musumeci, Olimpia
Moroni, Isabella
Uziel, Graziella
Santorelli, Filippo M.
Nesti, Claudia
Filosto, Massimiliano
Lamperti, Costanza
Zeviani, Massimo
Siciliano, Gabriele
description ABSTRACT Myoclonus is a possible manifestation of mitochondrial disorders, and its presence is considered, in association with epilepsy and the ragged red fibers, pivotal for the syndromic diagnosis of MERRF (myoclonic epilepsy with ragged red fibers). However, its prevalence in mitochondrial diseases is not known. The aims of this study are the evaluation of the prevalence of myoclonus in a big cohort of mitochondrial patients and the clinical characterization of these subjects. Based on the database of the “Nation‐wide Italian Collaborative Network of Mitochondrial Diseases,” we reviewed the clinical and molecular data of mitochondrial patients with myoclonus among their clinical features. Myoclonus is a rather uncommon clinical feature of mitochondrial diseases (3.6% of 1,086 patients registered in our database). It is not strictly linked to a specific genotype or phenotype, and only 1 of 3 patients with MERRF harbors the 8344A>G mutation (frequently labeled as “the MERRF mutation”). Finally, myoclonus is not inextricably linked to epilepsy in MERRF patients, but more to cerebellar ataxia. In a myoclonic patient, evidences of mitochondrial dysfunction must be investigated, even though myoclonus is not a common sign of mitochondriopathy. Clinical, histological, and biochemical data may predict the finding of a mitochondrial or nuclear DNA mutation. Finally, this study reinforces the notion that myoclonus is not inextricably linked to epilepsy in MERRF patients, and therefore the term “myoclonic epilepsy” seems inadequate and potentially misleading. © 2014 International Parkinson and Movement Disorder Society
doi_str_mv 10.1002/mds.25839
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However, its prevalence in mitochondrial diseases is not known. The aims of this study are the evaluation of the prevalence of myoclonus in a big cohort of mitochondrial patients and the clinical characterization of these subjects. Based on the database of the “Nation‐wide Italian Collaborative Network of Mitochondrial Diseases,” we reviewed the clinical and molecular data of mitochondrial patients with myoclonus among their clinical features. Myoclonus is a rather uncommon clinical feature of mitochondrial diseases (3.6% of 1,086 patients registered in our database). It is not strictly linked to a specific genotype or phenotype, and only 1 of 3 patients with MERRF harbors the 8344A&gt;G mutation (frequently labeled as “the MERRF mutation”). Finally, myoclonus is not inextricably linked to epilepsy in MERRF patients, but more to cerebellar ataxia. In a myoclonic patient, evidences of mitochondrial dysfunction must be investigated, even though myoclonus is not a common sign of mitochondriopathy. Clinical, histological, and biochemical data may predict the finding of a mitochondrial or nuclear DNA mutation. 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However, its prevalence in mitochondrial diseases is not known. The aims of this study are the evaluation of the prevalence of myoclonus in a big cohort of mitochondrial patients and the clinical characterization of these subjects. Based on the database of the “Nation‐wide Italian Collaborative Network of Mitochondrial Diseases,” we reviewed the clinical and molecular data of mitochondrial patients with myoclonus among their clinical features. Myoclonus is a rather uncommon clinical feature of mitochondrial diseases (3.6% of 1,086 patients registered in our database). It is not strictly linked to a specific genotype or phenotype, and only 1 of 3 patients with MERRF harbors the 8344A&gt;G mutation (frequently labeled as “the MERRF mutation”). Finally, myoclonus is not inextricably linked to epilepsy in MERRF patients, but more to cerebellar ataxia. In a myoclonic patient, evidences of mitochondrial dysfunction must be investigated, even though myoclonus is not a common sign of mitochondriopathy. Clinical, histological, and biochemical data may predict the finding of a mitochondrial or nuclear DNA mutation. 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Orsucci, Daniele ; Angelini, Corrado ; Bertini, Enrico ; Catteruccia, Michela ; Pegoraro, Elena ; Carelli, Valerio ; Valentino, Maria L. ; Comi, Giacomo P. ; Minetti, Carlo ; Bruno, Claudio ; Moggio, Maurizio ; Ienco, Elena Caldarazzo ; Mongini, Tiziana ; Vercelli, Liliana ; Primiano, Guido ; Servidei, Serenella ; Tonin, Paola ; Scarpelli, Mauro ; Toscano, Antonio ; Musumeci, Olimpia ; Moroni, Isabella ; Uziel, Graziella ; Santorelli, Filippo M. ; Nesti, Claudia ; Filosto, Massimiliano ; Lamperti, Costanza ; Zeviani, Massimo ; Siciliano, Gabriele</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3919-dda86eecff4973a71dddc8a29f563cb10f7fb6d0f404828ff71fe8323641f4e63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>8344A&gt;G</topic><topic>Adolescent</topic><topic>Adult</topic><topic>ataxia</topic><topic>Child</topic><topic>Child, Preschool</topic><topic>Cohort Studies</topic><topic>Female</topic><topic>Humans</topic><topic>Italy</topic><topic>Male</topic><topic>Middle Aged</topic><topic>Mitochondrial Diseases - complications</topic><topic>Movement disorders</topic><topic>mtDNA</topic><topic>myoclonic epilepsy</topic><topic>myoclonus</topic><topic>Myoclonus - epidemiology</topic><topic>Myoclonus - etiology</topic><topic>Severity of Illness Index</topic><topic>Young Adult</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mancuso, Michelangelo</creatorcontrib><creatorcontrib>Orsucci, Daniele</creatorcontrib><creatorcontrib>Angelini, Corrado</creatorcontrib><creatorcontrib>Bertini, Enrico</creatorcontrib><creatorcontrib>Catteruccia, Michela</creatorcontrib><creatorcontrib>Pegoraro, Elena</creatorcontrib><creatorcontrib>Carelli, Valerio</creatorcontrib><creatorcontrib>Valentino, Maria L.</creatorcontrib><creatorcontrib>Comi, Giacomo P.</creatorcontrib><creatorcontrib>Minetti, Carlo</creatorcontrib><creatorcontrib>Bruno, Claudio</creatorcontrib><creatorcontrib>Moggio, Maurizio</creatorcontrib><creatorcontrib>Ienco, Elena Caldarazzo</creatorcontrib><creatorcontrib>Mongini, Tiziana</creatorcontrib><creatorcontrib>Vercelli, Liliana</creatorcontrib><creatorcontrib>Primiano, Guido</creatorcontrib><creatorcontrib>Servidei, Serenella</creatorcontrib><creatorcontrib>Tonin, Paola</creatorcontrib><creatorcontrib>Scarpelli, Mauro</creatorcontrib><creatorcontrib>Toscano, Antonio</creatorcontrib><creatorcontrib>Musumeci, Olimpia</creatorcontrib><creatorcontrib>Moroni, Isabella</creatorcontrib><creatorcontrib>Uziel, Graziella</creatorcontrib><creatorcontrib>Santorelli, Filippo M.</creatorcontrib><creatorcontrib>Nesti, Claudia</creatorcontrib><creatorcontrib>Filosto, Massimiliano</creatorcontrib><creatorcontrib>Lamperti, Costanza</creatorcontrib><creatorcontrib>Zeviani, Massimo</creatorcontrib><creatorcontrib>Siciliano, Gabriele</creatorcontrib><collection>Istex</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Neurosciences Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>ProQuest Health &amp; 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subjects 8344A>G
Adolescent
Adult
ataxia
Child
Child, Preschool
Cohort Studies
Female
Humans
Italy
Male
Middle Aged
Mitochondrial Diseases - complications
Movement disorders
mtDNA
myoclonic epilepsy
myoclonus
Myoclonus - epidemiology
Myoclonus - etiology
Severity of Illness Index
Young Adult
title Myoclonus in mitochondrial disorders
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