Summary
Adrenoleukodystrophy (ALD) is an X‑linked hereditary disorder due to mutations of the ABCD1 gene, which encodes a peroxisomal transport protein necessary for very long-chain fatty acid degradation (VLCFA). Toxic accumulation thereof is associated with a proinflammatory state and eventual cell death in multiple tissues. ALD may manifest either as a fatal, rapidly progressive demyelinating disease in boys and adult men, or as a slowly progressive adult-onset long-tract myelopathy along with peripheral neuropathy. Our understanding of manifold mechanisms implicated in the disease pathology is currently incomplete, as neither genotype–phenotype correlation nor the trigger for cerebral disease has been described. Therapy objectives are therefore broadly aimed at correcting either the gene mutation or downstream molecular effects, such as oxidative stress. Advancements in disease detection, including the newly implemented newborn screening in the US and imaging modalities, allow for more timely intervention in the form of hematopoietic stem cell transplantation (HSCT), which may only be performed in early cerebral disease states.
Zusammenfassung
Adrenoleukodystrophie (ALD) ist eine X‑chromosomale Erbkrankheit, die auf Mutationen des ABCD1-Gens basiert. Dieses codiert für ein peroxisomales Transportprotein, welches zur metabolischen Degradation überlangkettiger Fettsäuren notwendig ist. Bei Dysfunktion können diese akkumulieren und führen zu einem proinflammatorischen Zustand sowie schließlich zum Zelltod in vielen Geweben. ALD kann sich bei männlichen Kindern und Erwachsenen als rasch fortschreitende, tödliche, demyelinisierende Erkrankung der weißen Substanz manifestieren oder als langsam fortschreitende Myelopathie der langen Bahnen des Rückenmarks mit peripherer Neuropathie und Beginn im Erwachsenenalter. Die molekularen Mechanismen der Krankheit sind nicht zur Gänze geklärt, da weder die Genotyp-Phänotyp-Korrelationen noch zerebrale Krankheitsauslöser bekannt sind. Therapieansätze konzentrieren sich daher darauf, die Genmutation oder die daraus abgeleiteten molekularen Effekte wie oxidativen Stress zu kompensieren. Neue Diagnosemethoden wie das in den USA neuimplementierte Neugeborenenscreening oder neuere bildgebende Verfahren erlauben einen frühzeitigeren Therapiebeginn durch hämatopoetische Stammzelltransplantation, die möglicherweise nur in den Anfangsstadien der Krankheit durchgeführt werden kann.
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Acknowledgements
The authors would like to thank the Myelin Project, the Brian’s Hope Foundation, and the ALD families for their continuous support and commitment.
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B.R. Turk, A.B. Moser, and A. Fatemi declare that they have no competing interests.
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Turk, B.R., Moser, A.B. & Fatemi, A. Therapeutic strategies in adrenoleukodystrophy. Wien Med Wochenschr 167, 219–226 (2017). https://doi.org/10.1007/s10354-016-0534-2
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DOI: https://doi.org/10.1007/s10354-016-0534-2