MERRF syndrome (or Myoclonic Epilepsy with Ragged Red Fibers) is a mitochondrial disease. It is extremely rare, with an estimated prevalence of 1/400,000 in Europe, and has varying degrees of expressivity owing to heteroplasmy.[1]
[edit] Presentation
It involves the following characteristics:
[edit] Causes
The MERRF syndrome is caused by a maternally-inherited mutation at position 8344 in the mitochondrial genome in over 80% of cases. This point mutation disrupts the mitochondrial gene for tRNA-Lys and so disrupts synthesis of proteins essential for oxidative phosphorylation.
Many genes are involved.[2] These include:
[edit] Treatment
Like many mitochondrial diseases, there is no cure for MERRF and treatment is primarily symptomatic. High doses of Coenzyme Q10 and L-Carnitine have been tried with little success as therapies in hopes of improving mitochondrial function.[7]
[edit] See also
[edit] References
- ^ Gene Reviews- MERRF
- ^ Online 'Mendelian Inheritance in Man' (OMIM) MYOCLONIC EPILEPSY ASSOCIATED WITH RAGGED-RED FIBERS; MERRF -545000
- ^ Zeviani M, Muntoni F, Savarese N, et al. (1993). "A MERRF/MELAS overlap syndrome associated with a new point mutation in the mitochondrial DNA tRNA(Lys) gene". Eur. J. Hum. Genet. 1 (1): 80–7. PMID 8069654.
- ^ Melone MA, Tessa A, Petrini S, et al. (February 2004). "Revelation of a new mitochondrial DNA mutation (G12147A) in a MELAS/MERFF phenotype". Arch. Neurol. 61 (2): 269–72. doi:10.1001/archneur.61.2.269. PMID 14967777. http://archneur.ama-assn.org/cgi/pmidlookup?view=long&pmid=14967777.
- ^ Nakamura M, Nakano S, Goto Y, et al. (September 1995). "A novel point mutation in the mitochondrial tRNA(Ser(UCN)) gene detected in a family with MERRF/MELAS overlap syndrome". Biochem. Biophys. Res. Commun. 214 (1): 86–93. doi:10.1006/bbrc.1995.2260. PMID 7669057. http://linkinghub.elsevier.com/retrieve/pii/S0006-291X(85)72260-7.
- ^ Mancuso M, Filosto M, Mootha VK, et al. (June 2004). "A novel mitochondrial tRNAPhe mutation causes MERRF syndrome". Neurology 62 (11): 2119–21. PMID 15184630. http://www.neurology.org/cgi/pmidlookup?view=long&pmid=15184630.
- ^ Gene reviews - MERRF. Management of patients
[edit] External links
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| Carbohydrate metabolism |
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| Primarily nervous system |
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| Myopathies |
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| No primary system |
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| Chromosomal |
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B structural (perx, skel, cili, mito, nucl, sclr) · DNA/RNA/protein synthesis (drep, trfc, tscr, tltn) · membrane (icha, slcr, atpa, abct, othr) · transduction (iter, csrc, itra), trfk
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