Modulators of neuroinflammation have a beneficial effect. Fdgpet assessment and metabolic patterns in lafora disease. A dog must inherit two of the mutated genes, one from each parent to be classified affected. Early parkinsonism in a senegalese girl with lafora disease. Lafora disease is the most severe form of human epilepsy. Some of the accumulations were morphologically similar to lafora bodies as they have been seen in the brain. Occipital independent multiple spikes are frequently observed and could correlate with the visual symptoms observated in the lafora disease. Among pmes, ld is unique because of the rapid neurological deterioration of the patients and the appearance in brain and peripheral tissues of insoluble glycogenlike polyglucosan inclusions, named lafora bodies lbs. We studied the electroencephalogram eeg patterns of two beagles in whom ld was subsequently confirmed by genetic testing. Myoclonus is a brief, involuntary twitching of a muscle or a group of muscles. Towards a clinical, pathologic, and molecular synthesis berge a. Matthew gentry, director of the lafora epilepsy cure initiative leci and professor at the university of kentucky college of medicine. A 17yearald patient had myoclonic epilepsy caused by lafora s disease. The impact of lafora is enormous, both for our dogs 2 with the disease and ourselves.
Jul 26, 2019 lafora disease belongs to a family of human diseases called glycogen storage disease, she said. Lossoffunction mutations in either of two genes are the cause of lafora disease. The condition most commonly begins with epileptic seizures in late childhood or adolescence. Minassian, md lafora s disease is one of five inherited progressive myoclonus epilepsy syndromes. Lafora disease ld is characterized by progressive myoclonus, refractory epilepsy, and cognitive deterioration. Symptoms develop because the dog cannot efficiently process starch into sugar. Over time, insoluble starch platelets gradually build up in the central nervous system. Although the condition occurs worldwide, it appears to be most common in mediterranean countries including spain, france, and italy, parts of central asia, india, pakistan, north africa, and the middle east. Lafora s disease epilepsy characterized by clonus of muscle groups and progressive mental deterioration and genetic origin myoclonus epilepsy. Lafora disease in dogs vetlexicon canis from vetstream. Deficiency of the e3 ubiquitin ligase malin correlates with increased.
Myoclonus jerking is a feature of the disease which characteristically can be induced by flashing lights, sudden sounds and movement especially that are close to the dogs head. Preclinical study of therapeutic strategy for lafora disease. Lafora disease epm2a epm2b epilepsy progressive myoclonus neurodegeneration abstract background. What lafora disease is it is a progressive neurologic disease characterized by seizures, mioclonia, brain symptoms and psychic deterioration. The following 6 months were seizurefree, with a relative. It is this debilitation which frequently brings the parents of a lafora disease afflicted canine to a decision concerning possible euthanasia. Lafora disease is characterized by epilepsy and the accumulation of. Lafora disease ld, omim254780 is a rare and fatal form of progressive myoclonus epilepsy pme. Lafora disease ld is autosomal recessive progressive myoclonus.
Lafora disease ld is a teenageonset fatal progressive myoclonus epilepsy caused by lossoffunction mutations in the epm2a gene encoding the glycogen phosphatase laforin or epm2b encoding the laforininteracting ubiquitin e3 ligase malin. The condition is characterised by a late onset of epilepsy, myoclonus and dementia. Pdf lafora disease is a severe, autosomal recessive, progressive myoclonus epilepsy. Myoclonus jerking is a feature of the disease and characteristically this can be induced by flashing lights, sudden sounds and movement especially that close to the dogs head. Lafora disease genetic and rare diseases information. Progressive myoclonus epilepsy of the lafora type lafora disease. Ld is caused by mutations in the epm2a gene, encoding the dual phosphatase. Lafora disease ld is a rare, progressive, autosomal recessive neurodegenerative disorder characterized by intractable seizures, inexorable neurological deterioration, cognitive decline, dementia, and death within 10 years of onset. The publishers final edited version of this article is available free at rev. Lafora disease is a lateonset neurodegenerative disease associated with myoclonus epilepsy irregular and uncontrollable jerks of a muscle or group of muscles associated with epileptic seizures and death within a few years of diagnosis. Characteristic seizures include myoclonic and occipital.
Lafora s disease is an inherited, late onset, progressive myoclonic epilepsy. Biopsy showed polysaccharide accumulations within membranebound spaces in skeletal muscle cells. Lafora disease in dogs symptoms, causes, diagnosis. Lafora disease is caused by lossoffunction mutations in epm2a or nhlrc1, which encode laforin and malin, respectively. In our patient, however, inclusion bodies were more. Lafora disease affects a small number of people compared to the general population and is considered rare in many parts of the world. Lafora disease in miniature wirehaired dachshunds plos. Lafora disease ld is an autosomal recessive late onset, progressive myoclonic epilepsy with a high prevalence in the miniature wirehaired dachshund.
Natural history and functional status study of patients with. Preclinical study of therapeutic strategy for lafora. Lafora disease is a progressive and fatal autosomal recessive disorder characterized by recurrent myoclonic and other types of seizure as well as relentlessly progressive intellectual and neurologic deterioration. Lafora disease, a lethal, autosomal recessive, progressive myoclonus epilepsy, is caused by lossoffunction mutations in epm2a or nhlrc1. Evaluation and use of disaccharides as energy source in proteinfree mamma. About lafora disease chelseas hope lafora research.
Lafora disease presents as a neurodegenerative disorder that causes impairment in the development of cerebral cortical neurons. Treatment with metformin in twelve patients with lafora. Lafora s disease is one of five inherited progressive myoclonus epilepsy syndromes. Lafora disease is a rare, autosomal recessive, progressive myoclonic epilepsy with onset typically in the second decade of life and uniformly fatal outcome. For example, in great britain the percentage of miniature wirehaired dachshunds affected by this autosomal recessive progressive disease exceeds 5%.
Genetics of lafora lafora is an inherited autosomal recessive condition. Unfortunately, the field of rare diseases as a whole suffers from a shortage of medical and scientific knowledge, largely due to lack of awareness and funding sources. Lafora disease, also called lafora progressive myoclonic epilepsy or melf, is a fatal autosomal recessive genetic disorder characterized by the presence of i. It may also be considered as a disorder of carbohydrate metabolism because of the formation of polyglucosan inclusion bodies in neural and other tissues due to abnormalities of the proteins laforin or malin. Lafora progressive myoclonus epilepsy lafora disease is a fatal autosomal recessive. A novel epm2a mutation in a patient with lafora disease presenting. Natural history and functional status study of patients. Lafora disease, is a rare, adultonset recessive neurodegenerative disease, which results in myoclonus epilepsy and usually results in death several years after the onset of symptoms. Lafora disease ld is an autosomalrecessive disorder first described as a. Aug 01, 2010 the phosphatase laforin crosses evolutionary boundaries and links carbohydrate metabolism to neuronal disease. Lafora disease genetic and rare diseases information center.
Described for the first time in 1911 by gonzalo rodriguez lafora 18861971 a spanish neurologist. Most of the current literature focuses on diagnosis, genetic basis, neurological signs, and possible treatment of this currently incurable disease. One of the pathological hallmarks of the ld is the presence of lafora bodiesinclusions of an abnormal glycogenin. Lafora disease is a rare, genetic, glycogen metabolism disorder inherited as autosomal recessive characterized by the presence of inclusion bodies, known as lafora bodies, within the cytoplasm of the cells in the heart, liver, muscle, and skin.
Generalized or complex partial seizures seizures may be seen in some dogs. Lafora disease is a rare, genetic, glycogen metabolism disorder inherited as. Treatment with metformin in twelve patients with lafora disease. Skin biopsy specimens from the midcalf area confirmed earlier findings by showing numerous periodic acidschiffpositive inclusion bodies in eccrine sweat gland duct cells. Lafora disease from pathogenesis to treatment strategies. Lafora disease ld is an autosomal recessive myoclonic epilepsy. The phosphatase activity of laforin is dispensable to rescue epm2a. The histochemical reactions of these membranebound spaces suggested that they were peroxisomes. It is thought to be transmitted by autosomal recessive inheritan. Accumulation of laforin and other related proteins in canine.
Lafora disease ld is a rare, fatal, lateonset, progressive form of myoclonic epilepsy, occurring in humans and dogs. Lafora disease ld is a rare, fatal, lateonset, progressive form of myoclonic. Pdf lafora disease from pathogenesis to treatment strategies. It will, however, likely cause significant debilitation to your canine family member as the disease progresses. Epilepsy is one of the most frequent chronic neurological diseases in dogs affecting approximately 5 % of all dogs. Other signs and symptoms include difficulty walking, muscle spasms myoclonus and dementia. Lafora disease ld is a fatal form of neurodegenerative disorder associated with progressive. Aug 01, 2015 skin inflammatory nontumor lafora body disease ld this website is intended for pathologists and laboratory personnel but not for patients. Lafora disease in miniature wirehaired dachshunds is a lateonset progressive myoclonic epilepsy that occurs around 7 years of age. The laforinmalin complex, involved in lafora disease. Lafora disease is an inherited, late onset, progressive myoclonic epilepsy. The prevalence of lafora progressive myoclonus epilepsy is unknown. Clinical manifestations of ld usually include seizures, spontaneous and reflex myoclonus with contractions of the neck and limb muscles.
Treatment for lafora disease shows promise in preclinical. Earlyonset lafora body disease brain oxford academic. Laforas disease is a neurometabolic disease characterized by progressive myoclonus epilepsy. Lafora disease from pathogenesis to treatment strategies nature. We also have to plan any outings or holidays meticulously to ensure the welfare of the dogs. Pdf lafora disease ld is an autosomal recessive progressive myoclonus epilepsy due to mutations in the epm2a laforin and epm2b. Studies on a mouse model of ld showed a good response to metformin, a drug with a well known neuroprotective effect. The disease usually manifests in previously healthy adolescents, and death commonly occurs within 10 years of. A patient had the clinical and neuropathologic signs of lafora s disease. Lafora disease in dogs lafora disease is a hereditary disorder and is known to be transmitted as an autosomal recessive pattern. Lafora disease is an inherited form of epilepsy that affects miniature wirehaired dachshunds. Lafora s disease synonyms, lafora s disease pronunciation, lafora s disease translation, english dictionary definition of lafora s disease.
Some elements of differential diagnosis are given with respect to primary generalized epilepsy at the onset of the disease and later on with respect to dyssynergia cerebellaris myoclonica and to the. Lafora epilepsy genetic test is accredited by the czech accreditation institute in compliance with iso17025. Eeg patterns orienting to lafora disease diagnosisa. Generalised or complex partial seizures may be seen in some dogs. For the first time it has been discovered in pedigree miniature wirehaired dachshunds.
Regulation of the autophagic pi3kc3 complex by laforinmalin e3ubiquitin ligase, two proteins involved in lafora disease. Lafora disease ld is an adolescenceonset, genetic, and fatal form of neurodegenerative disorder with disease defining symptoms such as progressive myoclonus epilepsy, ataxia, muscle wasting, and intellectual disabilities. Aug 29, 2012 lafora disease is a rare, fatal, autosomal recessive, progressive myoclonic epilepsy. Laforas disease definition of laforas disease by the. The condition is characterized by epilepsy, myoclonus and dementia. Most cases of lafora disease are caused by mutations in one of two known genes.
Lafora disease national center for biotechnology information. Targeting pathogenic lafora bodies in lafora disease. Omim254780, orpha501 is a rare form of progressive myoclonus epilepsy, first described in 1911 by the spanish neurologist gonzalo r. Lafora disease epidemiology, pathophysiology and management. For this reason, in 2016, the european medicines agency granted orphan designation to metformin for the treatment of ld. The progressive myoclonic epilepsy of lafora or lafora disease ld is a neurodegenerative disorder. The disease is characterized by the accumulation of insoluble particles called lafora bodies, which are derived from glycogen. Lafora disease is an inherited, severe form of progressive myoclonus epilepsy. Lafora disease definition of lafora disease by medical. Concerted actions of glycogen synthase gs and branching enzyme generate normal shortbranched soluble glycogen. Support for dog owners affected by lafora, brucellosis. We have had to adopt a different way of living trying at all times to make adjustments that will reduce the lafora symptoms as much as possible. Ketogenic diet reduces lafora bodies in murine lafora disease.
Frontiers eeg patterns orienting to lafora disease. Laforin and malin form a functional complex that is involved in the regulation of glycogen synthesis. Pmes include unverrichtlundborg disease uld, lafora disease ld, neuronal ceroid lipofuscinoses, sialidosis type i, myoclonus epilepsy and ragged red fibers merrf, gaucher disease type 3, dentatorubralpallidoluysian atrophy drpla, and other rare forms of pmes. Lafora disease definition of lafora disease by the free. The disease usually manifests in previously healthy adolescents, and death commonly occurs within 10 years of symptom onset.
Canine lafora disease ld is an autosomal recessive genetic disorder causing nonfatal. These bodies are free lying and located mainly in the large. Survival is short, less than 10 years after onset, which is usually in the first half of the second decade of life. A dog that has only one mutated lafora gene is a carrier. Lafora disease is a rare, fatal, autosomal recessive hereditary disease characterized by epilepsy, myoclonus and progressive neurological deterioration. The disease is due to a mutation in the epm2b gene which results in intracellular accumulation of abnormal glycogen lafora bodies.
Lafora disease in dogs, though a rare inherited disease, is not generally fatal for your pet. Pathologically, the disease is characterized by the presence of polyglucosan intracellular inclusion bodies called lafora bodies. Val0417 lafora disease ld lafora disease it is caused by lossoffunction mutations in either the laforin gene epm2a or malin gene nhlrc1 and is associated with gradual accumulation of lafora bodies, aggregates of poorly branched, hyperphosphorylated, insoluble glycogen also known as polyglusan. This complex neurodegenerative condition is caused by pathogenic variants in epm2aepm2b genes, encoding two essential glycogen metabolism enzymes. A form of progressive myoclonus epilepsy, in vinken pj, bruyn gw eds. It is caused by lossoffunction mutations in either the laforin gene epm2a or malin gene. Lafora disease synonyms, lafora disease pronunciation, lafora disease translation, english dictionary definition of lafora disease. The gene epm2a makes the protein called laforin and the gene epm2b makes the protein called malin. It is important to know that myoclonus is a clinical sign and not a disease. Jun 21, 2019 background lafora disease ld is a rare, lethal, progressive myoclonus epilepsy for which no targeted therapy is currently available. Mar 15, 2019 a natural history and functional status study to characterize the clinical disease course in lafora disease patients using standardized, quantitative evaluations and to identify useful biomarkers and clinical outcome measures for use in future lafora treatment studies.
Lafora disease is a hereditary disorder and is known to be transmitted as an autosomal recessive pattern. It will not become clinically affected by the disease but, if bred to. This complex neurodegenerative condition is caused by pathogenic variants in epm2aepm2b. Progressive myoclonus epilepsy, lafora type also known as lafora disease ld is characterized by focal occipital seizures presenting as transient blindness or visual hallucinations and fragmentary, symmetric, or generalized myoclonus beginning in previously healthy individuals at age eight to 19 years peak 1416 years. Lafora disease is a severe, autosomal recessive, progressive myoclonus epilepsy. Lafora disease is caused by mutations in the epm2a or epm2b genes, encoding the laforin phosphatase and the malin ubiquitin ligase, respectively, 2 cytoplasmically active enzymes that regulate glycogen construction.
693 338 622 412 975 852 862 309 1460 1166 1178 452 797 132 221 764 613 881 446 978 1113 1036 281 321 370 1471 110 906 946 214 1527 246 79 584 814 1175