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X-Linked Dystonia-Parkinsonism: Recent Advances

Overview
Specialty Neurology
Date 2019 May 23
PMID 31116117
Citations 12
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Abstract

Purpose Of Review: Our understanding of X-Linked Dystonia-Parkinsonism (XDP) has advanced considerably in recent years because of a wealth of new data describing its genetic basis, cellular phenotypes, neuroimaging features, and response to deep brain stimulation (DBS). This review provides a concise summary of these studies.

Recent Findings: XDP is associated with a SINE-VNTR-Alu (SVA)-type retrotransposon insertion within the TAF1 gene. This element includes a hexameric DNA repeat expansion, (CCCTCT)n, the length of which varies among patients and is inversely correlated to age of disease onset. In cell models, the SVA alters TAF1 splicing and reduces levels of full-length transcript. Neuroimaging data have confirmed previous neuropathology studies that XDP involves a progressive striatal atrophy, while further detecting functional alterations in additional brain regions. In patients exhibiting features of both dystonia and parkinsonism, pallidal DBS has resulted in rapid improvement of hyperkinetic movements, but effects on hypokinetic features have been inconsistent.

Summary: The discovery that XDP is linked to a polymorphic hexameric sequence suggests that it could share mechanisms with other DNA repeat disorders, whereas the transcriptional defect in cell models raises the possibility that strategies to correct TAF1 splicing could provide therapeutic benefit.

Citing Articles

Targeting Myeloperoxidase to Reduce Neuroinflammation in X-Linked Dystonia Parkinsonism.

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Mini-heterochromatin domains constrain the cis-regulatory impact of SVA transposons in human brain development and disease.

Horvath V, Garza R, Jonsson M, Johansson P, Adami A, Christoforidou G Nat Struct Mol Biol. 2024; 31(10):1543-1556.

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Taf1 knockout is lethal in embryonic male mice and heterozygous females show weight and movement disorders.

Crombie E, Korecki A, Cleverley K, Adair B, Cunningham T, Lee W Dis Model Mech. 2024; 17(7).

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Nine Hereditary Movement Disorders First Described in Asia: Their History and Evolution.

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PMID: 37309109 PMC: 10548072. DOI: 10.14802/jmd.23065.


Variation in TAF1 expression in female carrier induced pluripotent stem cells and human brain ontogeny has implications for adult neostriatum vulnerability in X-linked Dystonia Parkinsonism.

DIgnazio L, Jacomini R, Qamar B, Benjamin K, Arora R, Sawada T eNeuro. 2022; .

PMID: 35868859 PMC: 9428949. DOI: 10.1523/ENEURO.0129-22.2022.


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