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White matter abnormalities in 15 subjects with SPG76

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Abstract

Background and objectives

Hereditary spastic paraplegias (HSPs) are heterogenous genetic disorders characterized by progressive pyramidal tract involvement. SPG76 is a recently identified form of HSP, caused by biallelic calpain-1 (CAPN1) variants. The most frequently described MRI abnormality in SPG76 is mild cerebellar atrophy and non-specific white matter abnormalities were reported in only one case. Following the identification of prominent white matter abnormalities in a subject with CAPN1 variants, which delayed the diagnosis, we aimed to verify the presence of MRI patterns of white matter involvement specific to this HSP.

Methods

We performed a retrospective radiological qualitative analysis of 15 subjects with SPG76 (4 previously unreported) initially screened for white matter involvement. Moreover, we performed quantitative analyses in our proband with available longitudinal studies.

Results

We observed bilateral, periventricular white matter involvement in 12 subjects (80%), associated with multifocal subcortical abnormalities in 5 of them (33.3%). Three subjects (20%) presented only multifocal subcortical involvement. Longitudinal quantitative analyses of our proband revealed increase in multifocal white matter lesion count and increased area of periventricular white matter involvement over time.

Discussion

SPG76 should be added to the list of HSPs with associated white matter abnormalities. We identified periventricular white matter involvement in subjects with SPG76, variably associated with multifocal subcortical white matter abnormalities. These findings, in the presence of progressive spastic paraparesis, can mislead the diagnostic process towards an acquired white matter disorder.

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Data availability

Anonymized data will be shared upon reasonable request from the corresponding author.

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Funding

R. La Piana has received a Research Scholar Junior 1 award from the Fonds de Recherche du Québec en Santé (FRQS), research funds from the Canadian Radiological Foundation and from the Spastic Paraplegia Foundation.

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Correspondence to Roberta La Piana.

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Conflicts of interest

A. Alkhalifa reports no disclosures relevant to the manuscript. S. Chen reports no disclosures relevant to the manuscript. Z. I. Hasiloglu reports no disclosures relevant to the manuscript. M. Filosto reports no disclosures relevant to the manuscript. E. Cali reports no disclosures relevant to the manuscript. H. Houlden reports no disclosures relevant to the manuscript. P.V.S. de Souza reports no disclosures relevant to the manuscript. A. Alavi reports no disclosures relevant to the manuscript. C. Goizet reports no disclosures relevant to the manuscript. G. Stevanin reports a Biogen-Paris-Sciences Lettres contract unrelated to this work, and a grant support from the ASL-HSP-France Association (to GS) related to genetic studies in HSP patients. F. Taithe reports no disclosures relevant to the manuscript. F. Nicita is a member of the European Reference Network for Rare Neurological Diseases (ERN-RND). G. Vasco reports no disclosures relevant to the manuscript. S. Tozza has received personal fees for scientific events from Alnylam Pharmaceuticals and Amicus Therapeutics, travel grants to attend scientific meetings from Akcea Therapeutics. S. Cocozza has received research grants from Telethon and FISM, and fees for speaking from Amicus Therapeutics. N. Carboni reports no disclosures relevant to the manuscript. A. Figus reports no disclosures relevant to the manuscript. J. Wu reports no disclosures relevant to the manuscript. A. N. Basak reports no disclosures relevant to the manuscript. B. Brais reports no disclosures relevant to the manuscript. G. Rouleau reports no disclosures relevant to the manuscript.

Ethical standard

The Institutional Review Boards of the participating institutions have approved the use of data for this retrospective study.

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Alkhalifa, A., Chen, S., Hasiloglu, Z.I. et al. White matter abnormalities in 15 subjects with SPG76. J Neurol 270, 5784–5792 (2023). https://doi.org/10.1007/s00415-023-11918-5

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