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14-September-2008 10:43:22 - Adrenoleukodystrophy This article may require cleanup to meet 's quality standards. Please improve this article if you can. September 2006 Adrenoleukodystrophy Classification and external resources ICD-10 E71.3 ICD-9 330.0, 277.86 OMIM 300100 202370 DiseasesDB 292 MeSH D000326 Adrenoleukodystrophy ALD also known as Addison-Schilder Disease or Siemerling-Creutzfeldt Disease is a rare, 1 in 20,000 boys inherited disorder that leads to progressive brain damage, failure of the adrenal glands and eventually death. ALD is one disease in a group of inherited disorders called leukodystrophies. Adrenoleukodystrophy progressively damages the myelin, a complex fatty neural tissue that insulates many nerves of the central and peripheral nervous systems. Without myelin, nerves are unable to conduct an impulse, leading to increasing disability as myelin destruction increases and intensifies. An essential protein, called a transporter protein, is missing in sufferers. This protein is needed to carry an enzyme which is used to break down very long-chain fatty acids found in the normal diet. Lack of this protein can give rise to a build-up of very long-chain fatty acids, VLCFA in the body which can damage the brain and the adrenal gland. The victims of ALD are nearly always male, with about one in five women carrying the disease developing a milder form in adult life, called adrenomyeloneuropathy. There are several different types of the disease which can be inherited. It is most commonly inherited as an X-linked condition. Although this disorder affects the growth and/or development of myelin, leukodystrophies are different from demyelinating disorders such as multiple sclerosis where myelin is formed normally but is lost by immunologic dysfunction or for other reasons. Contents 1 Symptoms 2 Diagnosis 3 Pathophysiology 3.1 X-linked 3.2 Autosomal 4 Screening 5 Treatment 6 Prognosis 7 Research 8 Lorenzo Odone 9 References 10 External links Symptoms The clinical presentation is largely dependent on the age of onset of the disease. The classical, severe type is the childhood cerebral form which, as an X-linked disease, affects males. Symptoms normally start between the ages of 4 and 10 and include loss of previously acquired neurologic abilities, seizures, ataxia, Addison's disease, as well as degeneration of visual and auditory function. It has been seen that infants that have been positively diagnosed by the age of 1 year old have usually become very ill by the age of 10 to 12 years of age and die soon after.This severe form of the disease was first described by E. Siemerling and Hans Gerhard Creutzfeldt.1 A similar form can also occur in adolescents and very rarely in adults. Addison's disease can be an initial symptom of ALD, and many pediatric endocrinologists will measure very long chain free fatty acids in newly diagnosed males with this condition, as a screening test for ALD. In another form of ALD which primarily strikes young men, the spinal cord dysfunction is more prominent and therefore is called adrenomyeloneuropathy, or AMN. The patients usually present with weakness and numbness of the limbs and urination or defecation problems. Most victims of this form are also males, although some female carriers exhibit symptoms similar to AMN. Adult and neonatal forms of the disease also exist but they are extremely rare. These tend to affect both males and females and be inherited in an autosomal recessive manner. Some patients may present with sole findings of adrenal insufficiency. ALD also causes uncontrollable rage in some cases.citation needed Diagnosis The diagnosis is established by clinical findings and the detection of serum very long-chain free fatty acid levels. MRI examination reveals white matter abnormalities, and neuro-imaging findings of this disease are somewhat reminiscent of the findings of multiple sclerosis. Genetic testing for the analysis of the defective gene is available in some centers. Pathophysiology X-linked The most common form of ALD is X-linked the defective gene is on the X chromosome, location Xq28, and is characterized by excessive accumulation of very long-chain fatty acids VLCFA - fatty acids chains with 24-30 carbon atoms particularly hexacosanoate, C26 in length. This was originally described by Moser et al in 1981.2 So, when the ALD gene was discovered in 1993, it was a surprise that the corresponding protein was in fact a member of a family of transporter proteins, not an enzyme. It is still unknown how the transporter affects the function of the fatty acid enzyme and, for that matter, how high levels of very long chain fatty acids cause the loss of myelin on nerve fibres. The gene ABCD1 or ATP-binding cassette, subfamily D, member 1 codes for a protein that transfers fatty acids into peroxisomes, the cellular organelles where the fatty acids undergo β-oxidation.3 A dysfunctional gene leads to the accumulation of very long chain fatty acids VLCFA. The precise mechanisms through which high VLCFA concentrations cause the disease were still unknown as of 2005, but accumulation is severe in the organs affected. The prevalence of X-linked adrenoleukodystrophy is approximately 1 in 20,000 individuals. This condition occurs with a similar frequency in all populations. Autosomal Autosomal adrenoleukodystrophy has been associated with PEX1, PEX5, PEX10, PEX13, and PEX26.4 Screening Neonatal screening is likely to become available which may permit proactive monitoring and treatment.5 Treatment While there is currently no cure for the disease, some dietary treatments, for example, a 4:1 mixture of glyceryl trioleate and glyceryl trierucate Lorenzo's oil in combination with a diet low in VLCFA, have been used with limited success, especially before disease symptoms appear. A 2005 study shows positive long-term results with this approach.6 A 2007 report also appraises Lorenzo's oil.7 See also the Myelin Project. X-linked adrenoleukodystrophy has a very variable clinical course, even within a single family.8 It is therefore not possible to determine if Lorenzo's oil is preventing progression of the disease in assymptomatic patients, or if these patients would have remain assymptomatic even without treatment. Current double blind placebo-controlled trials may be able to answer the questions regarding the effectiveness of treatment. Bone marrow transplantation BMT is the only known treatment that can stop the progression of the disease, and is the preferred first-line treatment for boys with cerebral X-linked ALD.citation needed However, BMT carries a risk of mortality and morbidity and is not recommended for patients whose symptoms are already severe. Lovastatin is an anti-cholesterol drug that appears have some effect in vitro, but not in mice with the animal model of adrenoleukodystrophy.9 Currently, researchers at The Children's Hospital at the University of Minnesota, Dr. Charnas and Dr. Orchard, are investigating Mucomyst as an adjunct to bone marrow transplant, with some increase in suvival time after transplant in 3 patients.10 Prognosis Treatment is symptomatic. Progressive neurological degeneration makes the prognosis generally poor. Death occurs within one to ten years of presentation of symptoms. The use of Lorenzo's Oil or of bone marrow transplant are currently under investigation. Research Active clinical trials are currently in progress to see if proposed treatments are effective or not:11 Glyceryl Trioleate Lorenzo's oil12 Beta Interferon and Thalidomide13 Combination of Glyceryl Trierucate and Glyceryl Trioleate Lorenzo's Oil14 Hematopoietic stem cell transplantation15 Lorenzo Odone Main article: Lorenzo Odone Lorenzo Michael Murphy Odone May 29, 1978 - May 30, 200816 was probably the most famous patient with ALD. His parents Augusto and Michaela Odone, frustrated by the limited treatment available,17 sparked the invention of Lorenzo's oil, which is still being studied to see if it has therapeutic benefit in halting the destruction of the myelin sheathing of nerves caused by this disease. The quest for a treatment for Lorenzo was depicted in the 1992 film Lorenzo's Oil, and was the subject of the Phil Collins song Lorenzo on his 1996 album Dance Into The Light. References ^ Siemerling E, Creutzfeldt HG 1923. Bronzekrankheit und sklerosierende Encephalomyelitis. Arch. Psychiat. Neurokrankh. 68: 217-44. ^ Moser HW, Moser AB, Frayer KK, et al Oct 1981. Adrenoleukodystrophy: increased plasma content of saturated very long chain fatty acids. Neurology 31 10: 1241-9. PMID 7202134. ^ Mosser J, Douar AM, Sarde CO, et al Feb 1993. Putative X-linked adrenoleukodystrophy gene shares unexpected homology with ABC transporters. Nature 361 6414: 726-30. doi:10.1038/361726a0. PMID 8441467. ^ Online 'Mendelian Inheritance in Man' OMIM ADRENOLEUKODYSTROPHY, AUTOSOMAL NEONATAL FORM -202370 ^ Moser HW, Raymond GV, Dubey P Dec 2005. Adrenoleukodystrophy: new approaches to a neurodegenerative disease. JAMA 294 24: 3131-4. doi:10.1001/jama.294.24.3131. PMID 16380594. ^ Moser, HW; Raymond GV, Lu S-E, Muenz LR, Moser AB, Xu J, Jones RO, Loes DJ, Melhem ER, Dubey P, Bezman L, Brereton NH, Odone A 2005-07. Follow-up of 89 asymptomatic patients with adrenoleukodystrophy treated with Lorenzo's Oil.. Archives of Neurology 62 7: p. 1073-80. doi:10.1001/archneur.62.7.1073. PMID 16009761. ^ Moser HW, Moser AB, Hollandsworth K, Brereton NH, Raymond GV Sep 2007. Lorenzo's oil therapy for X-linked adrenoleukodystrophy: rationale and current assessment of efficacy. J. Mol. Neurosci. 33 1: 105-13. doi:10.1007/s12031-007-0041-4. PMID 17901554. ^ Online 'Mendelian Inheritance in Man' OMIM Adrenoleukodystrophy -300100 ^ Lovaststin does not correct the accumulation of very long-chain free fatty acids in tissues of adrenoleukodystrophy protein deficient mice. PMID 11032335 |year=2000 ^ Tolar J, Orchard PJ, Bjoraker KJ, Ziegler RS, Shapiro EG, Charnas L Feb 2007. N-acetyl-L-cysteine improves outcome of advanced cerebral adrenoleukodystrophy. Bone Marrow Transplant. 39 4: 211-5. doi:10.1038/sj.bmt.1705571. PMID 17290278. ^ clinicaltrials.gov/ ^ ClinicalTrials.gov NCT00545597 ^ ClinicalTrials.gov NCT00004450 ^ ClinicalTrials.gov NCT00004418 ^ ClinicalTrials.gov NCT00383448 ^ Boy whose parents made Lorenzo's oil dies at 30. SFGate.com. Retrieved on 2008-05-30. ^ About Lorenzo, his Parents, and Oumouri. The Myelin Project. Retrieved on 2006-06-03. External links Adrenoleukodystrophy at the Open Directory Project adrenoleukodystrophy at NINDS Images of ALD at USUHS Adrenoleukodystrophy at National Center for Biotechnology Information Information from ALDlife.org v d e Lipid metabolism disorders / Inborn error of lipid metabolism - dyslipidemia E78 and E71.3, 272 Hyperlipidemia Hypercholesterolemia/Hypertriglyceridemia Familial hypercholesterolemia, Combined hyperlipidemia - Xanthoma Hypolipoproteinemia Hypoalphalipoproteinemia/HDL Lecithin cholesterol acyltransferase deficiency, Tangier disease Hypobetalipoproteinemia/LDL Abetalipoproteinemia, Apolipoprotein B deficiency Lipodystrophy Barraquer-Simons syndrome Fatty acid metabolism deficiency transport: Carnitine Primary, I, II, -acylcarnitine - Adrenoleukodystrophy beta oxidation: Acyl CoA dehydrogenase Short-chain, Medium-chain, Long-chain 3-hydroxy, Very long-chain - Mitochondrial trifunctional protein deficiency to acetyl-CoA: Malonic aciduria Cholesterol synthesis Smith-Lemli-Opitz syndrome Other Sjögren-Larsson syndrome - Lipomatosis - Adiposis dolorosa - Lipoid proteinosis see also lipid metabolism enzymes, lipoprotein metabolism v d e Peroxisomal disorders Zellweger spectrum Zellweger syndrome - Adrenoleukodystrophy Adrenomyeloneuropathy - Refsum's disease Other Acatalasia - Rhizomelic chondrodysplasia punctata - Mevalonic aciduria v d e Sex linkage: X-linked recessive disorders Cardiovascular Haemophilia A - Haemophilia B - X-linked sideroblastic anemia Skin Dyskeratosis congenita - Hypohidrotic ectodermal dysplasia EDA - X-linked ichthyosis Immune Chronic granulomatous disease CYBB - Wiskott-Aldrich syndrome - X-linked Severe Combined Immunodeficiency - X-linked agammaglobulinemia Nervous system Charcot-Marie-Tooth disease CMTX1-3 - eye Color blindness red and green, but not blue, Ocular albinism, Norrie disease, Choroideremia Metabolic/endocrine Fabry's disease - Glucose-6-phosphate dehydrogenase deficiency - Hunter syndrome - Lesch-Nyhan syndrome - Menkes disease - Ornithine transcarbamylase deficiency - Adrenoleukodystrophy - Androgen insensitivity syndrome/Kennedy disease - Oculocerebrorenal syndrome - Dent's disease - Pyruvate dehydrogenase deficiency - Diabetes insipidus Neuromuscular Becker's muscular dystrophy/Duchenne - Centronuclear myopathy - Myotubular myopathy - Conradi-Hünermann syndrome Multisystem Alport syndrome - Barth syndrome - Coffin-Lowry syndrome - Fragile X syndrome - McLeod syndrome - Pelizaeus-Merzbacher disease - Rett syndrome - Simpson-Golabi-Behmel syndrome Note: there are very few X-linked dominant disorders. These include X-linked hypophosphatemia, Focal dermal hypoplasia, Aicardi syndrome, Incontinentia pigmenti, and CHILD. Retrieved from http://en..org/wiki/Adrenoleukodystrophy Categories: Metabolic disorders | Genetic disorders | Leukodystrophies | Endocrinology | NeurologyHidden categories: Cleanup from September 2006 | All pages needing cleanup | All articles with statements | Articles with statements since July 2008 Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Deutsch Español Français Hrvatski Italiano עברית 日本語 Polski Português Suomi Svenska Türkçe This page was last modified on 11 September 2008, at 19:38
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