... no family history of MERRF. Fukuhara disease MERRF MERRF syndrome Myoclonic epilepsy associated with ragged-red fibers Myoencephalopathy ragged-red fiber disease Genetic Testing Registry: MERRF syndrome MERRF National Organization for Rare Disorders (NORD) ClinicalTrials. ...

... MERRF). This condition is characterized by muscle twitches (myoclonus), recurrent seizures (epilepsy), abnormal muscle cells known as ragged-red fibers, and other problems with the nervous system. Most ...

... have features of another mitochondrial disorder called myoclonic epilepsy with ragged-red fibers (MERRF); these additional features can include muscle twitches (myoclonus), difficulty coordinating movement (ataxia), and abnormal muscle cells ...

... a few people with variant forms of myoclonic epilepsy with ragged-red fibers (MERRF). In these cases, affected individuals typically have muscle twitches (myoclonus), muscle weakness (myopathy), difficulty coordinating movement (ataxia), hearing ...

... in a few people with features of myoclonic epilepsy with ragged-red fibers ... weakness (myopathy), difficulty coordinating movement (ataxia), hearing ...