Although the pathology of X-linked adrenoleukodystrophy (ALD) is well described, it represents the end-stage of neurodegeneration. It is still unclear what cell types are initially involved and what their role is in the disease process. Revisiting the seminal post-mortem studies from the 1970s can generate new hypotheses on pathophysiology. This review describes (histo)pathological changes of the brain and spinal cord in ALD. It aims at integrating older works with current insights and at providing an overarching theory on the pathophysiology of ALD. The data point to an important role for axons and glia in the pathology of both the myelopathy and leukodystrophy of ALD. In-depth pathological analyses with new techniques could help further unravel the sequence of events behind the pathology of ALD.
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http://dx.doi.org/10.1186/s13023-024-03105-0 | DOI Listing |
JACC Clin Electrophysiol
December 2024
Office of the Chief Medical Examiner, City and County of San Francisco, San Francisco, California, USA.
Background: Sudden cardiac death (SCD) genetic studies neglect the majority occurring in older decedents with cardiovascular pathology.
Objectives: This study sought to determine the burden of genetic disease in unselected adult sudden deaths by precision genotype-postmortem phenotype correlation.
Methods: The authors used autopsy, histology, and toxicology to adjudicate cause and identify high-suspicion phenotypes (eg, hypertrophic cardiomyopathy) among presumed SCDs aged 18 to 90 years referred to the county medical examiner from February 2011 to January 2018.
Orphanet J Rare Dis
December 2024
Assistant Professor of Cellular and Molecular Medicine, Shiraz Transplant Research Center, Shiraz University of Medical Sciences, Khalili St., Research Tower, Seventh Floor, Shiraz, Iran.
Glycogen storage disorders (GSD) GSD-IX are characterized by deficiencies in muscular and/or hepatic phosphorylase enzymes. GSD type IX za is an X-linked disorder, while IXb and IXc are autosomal recessive disorders resulting from pathogenic variants in the genes encoding the Phosphorylase b Kinase regulatory subunit alpha (PHKA), beta (PHKB), and gamma (PHKG), respectively. Despite progress in understanding these diseases, there are still unclear questions regarding their clinical manifestations, genetic variations, and the relationship between genotype and phenotype.
View Article and Find Full Text PDFMed Sci (Paris)
December 2024
UMR7216 - Épigénétique et destin cellulaire, CNRS, Université Paris Cité, Paris, France.
What if the presence of two X chromosomes confers functional specificities on female cells and contributes to the different susceptibilites of men and women to certain diseases? One of the X chromosomes is randomly silenced in each female cell from the embryonic stage, theoretically making the sexes equal. This silencing of the X chromosome is a unique epigenetic process, affecting an entire chromosome and resulting in mosaic expression of X-linked genes throughout the body. However, some genes escape this process and X-inactivation appears to be somewhat labile in certain cell types.
View Article and Find Full Text PDFJ Inherit Metab Dis
January 2025
Department of Complex Trait Genetics, Centre for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
X-linked adrenoleukodystrophy (ALD) is a peroxisomal disorder resulting from pathogenic variants in the ABCD1 gene that primarily affects the nervous system and is characterized by progressive axonal degeneration in the spinal cord and peripheral nerves and leukodystrophy. Dysfunction of peroxisomal very long-chain fatty acid (VLCFA) degradation has been implicated in ALD pathology, but the impact on astrocytes, which critically support neuronal function, remains poorly understood. Fibroblasts from four ALD patients were reprogrammed to generate human-induced pluripotent stem cells (hiPSC).
View Article and Find Full Text PDFInt J Surg Pathol
December 2024
Department of Neurosurgery, Fortis Memorial Research Institute, Gurugram, India.
Isocitrate dehydrogenase (IDH) mutant gliomas are classified as astrocytoma or oligodendroglioma based on the recent application of mutation, mutation, and 1p/19q co-deletion. Astrocytomas classically show and mutations, whereas oligodendrogliomas are defined by 1p/19q co-deletion. However, there are reports of gliomas that harbor both astrocytoma and oligodendroglioma morphologically and molecularly.
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