Defining the clinical, molecular and imaging spectrum of adaptor protein complex 4-associated hereditary spastic paraplegia
Bi-allelic loss-of-function variants in genes that encode subunits of the adaptor protein complex 4 (AP-4) lead to prototypical yet poorly understood forms of childhood-onset and complex hereditary spastic paraplegia: SPG47 (AP4B1), SPG50 (AP4M1), SPG51 (AP4E1) and SPG52 (AP4S1). Here, we report a d...
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| Main Authors: | , , , |
|---|---|
| Format: | Article (Journal) |
| Language: | English |
| Published: |
26 September 2020
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| In: |
Brain
Year: 2020, Volume: 143, Issue: 10, Pages: 2929-2944 |
| ISSN: | 1460-2156 |
| DOI: | 10.1093/brain/awz307 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/brain/awz307
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| Author Notes: | Darius Ebrahimi-Fakhari, Julian Teinert, Robert Behne, Miriam Wimmer, Angelica D'Amore, Kathrin Eberhardt, Barbara Brechmann, Marvin Ziegler, Dana M Jensen, Premsai Nagabhyrava, Gregory Geisel, Erin Carmody, Uzma Shamshad, Kira A. Dies, Christopher J Yuskaitis, Catherine L Salussolia, Daniel Ebrahimi-Fakhari, Toni S Pearson, Afshin Saffari, Andreas Ziegler, Stefan Kölker, Jens Volkmann, Antje Wiesener, David R Bearden, Shenela Lakhani, Devorah Segal, Anaita Udwadia-Hegde, Andrea Martinuzzi, Jennifer Hirst, Seth Perlman, Yoshihisa Takiyama, Georgia Xiromerisiou, Katharina Vill, William O Walker, Anju Shukla, Rachana Dubey Gupta, Niklas Dahl, Ayse Aksoy, Helene Verhelst, Mauricio R Delgado, Radka Kremlikova Pourova, Abdelrahim A Sadek, Nour M Elkhateeb, Lubov Blumkin, Alejandro J Brea-Fernández, David Dacruz-Álvarez, Thomas Smol, Jamal Ghoumid, Diego Miguel, Constanze Heine, Jan-Ulrich Schlump, Hendrik Langen, Jonathan Baets, Saskia Bulk, Hossein Darvish, Somayeh Bakhtiari, Michael C Kruer, Elizabeth Lim-Melia, Nur Aydinli, Yasemin Alanay, Omnia El-Rashidy, Sheela Nampoothiri, Chirag Patel, Christian Beetz, Peter Bauer, Grace Yoon, Mireille Guillot, Steven P Miller, Thomas Bourinaris, Henry Houlden, Laura Robelin, Mathieu Anheim, Abdullah S Alamri, Adel AH Mahmoud, Soroor Inaloo, Parham Habibzadeh, Mohammad Ali Faghihi, Anna C Jansen, Stefanie Brock, Agathe Roubertie, Basil T Darras, Pankaj B Agrawal, Filippo M Santorelli, Joseph Gleeson, Maha S Zaki, Sarah I Sheikh, James T Bennett and Mustafa Sahin |
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| 520 | |a Bi-allelic loss-of-function variants in genes that encode subunits of the adaptor protein complex 4 (AP-4) lead to prototypical yet poorly understood forms of childhood-onset and complex hereditary spastic paraplegia: SPG47 (AP4B1), SPG50 (AP4M1), SPG51 (AP4E1) and SPG52 (AP4S1). Here, we report a detailed cross-sectional analysis of clinical, imaging and molecular data of 156 patients from 101 families. Enrolled patients were of diverse ethnic backgrounds and covered a wide age range (1.0-49.3 years). While the mean age at symptom onset was 0.8 ± 0.6 years [standard deviation (SD), range 0.2-5.0], the mean age at diagnosis was 10.2 ± 8.5 years (SD, range 0.1-46.3). We define a set of core features: early-onset developmental delay with delayed motor milestones and significant speech delay (50% non-verbal); intellectual disability in the moderate to severe range; mild hypotonia in infancy followed by spastic diplegia (mean age: 8.4 ± 5.1 years, SD) and later tetraplegia (mean age: 16.1 ± 9.8 years, SD); postnatal microcephaly (83%); foot deformities (69%); and epilepsy (66%) that is intractable in a subset. At last follow-up, 36% ambulated with assistance (mean age: 8.9 ± 6.4 years, SD) and 54% were wheelchair-dependent (mean age: 13.4 ± 9.8 years, SD). Episodes of stereotypic laughing, possibly consistent with a pseudobulbar affect, were found in 56% of patients. Key features on neuroimaging include a thin corpus callosum (90%), ventriculomegaly (65%) often with colpocephaly, and periventricular white-matter signal abnormalities (68%). Iron deposition and polymicrogyria were found in a subset of patients. AP4B1-associated SPG47 and AP4M1-associated SPG50 accounted for the majority of cases. About two-thirds of patients were born to consanguineous parents, and 82% carried homozygous variants. Over 70 unique variants were present, the majority of which are frameshift or nonsense mutations. To track disease progression across the age spectrum, we defined the relationship between disease severity as measured by several rating scales and disease duration. We found that the presence of epilepsy, which manifested before the age of 3 years in the majority of patients, was associated with worse motor outcomes. Exploring genotype-phenotype correlations, we found that disease severity and major phenotypes were equally distributed among the four subtypes, establishing that SPG47, SPG50, SPG51 and SPG52 share a common phenotype, an ‘AP-4 deficiency syndrome’. By delineating the core clinical, imaging, and molecular features of AP-4-associated hereditary spastic paraplegia across the age spectrum our results will facilitate early diagnosis, enable counselling and anticipatory guidance of affected families and help define endpoints for future interventional trials. | ||
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