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The most common type of FTLD-FUS (aFTLD-U) is associated with a distinct clinical form of frontotemporal dementia but is not related to mutations in the FUS gene

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Abstract

Frontotemporal lobar degeneration (FTLD) is clinically, pathologically and genetically heterogeneous. Recent descriptions of a pathological sub-type that is ubiquitin positive, TDP-43 negative and immunostains positive for the Fused in Sarcoma protein (FUS) raises the question whether it is associated with a distinct clinical phenotype identifiable on clinical grounds, and whether mutations in the Fused in Sarcoma gene (FUS) might also be associated with FTLD. Examination of a pathological series of 118 cases of FTLD from two centres, showing tau-negative, ubiquitin-positive pathology, revealed FUS pathology in five patients, four classified as atypical FTLD with ubiquitin inclusions (aFTLD-U), and one as neuronal intermediate filament inclusion disease (NIFID). The aFTLD-U cases had youthful onset (22–46 years), an absence of strong family history, a behavioural syndrome consistent with frontotemporal dementia (FTD) and severe caudate atrophy. Their cognitive/behavioural profile was distinct, characterised by prominent obsessionality, repetitive behaviours and rituals, social withdrawal and lack of engagement, hyperorality with pica, and marked stimulus-bound behaviour including utilisation behaviour. They conformed to the rare behavioural sub-type of FTD identified previously by us as the “stereotypic” form, and linked to striatal pathology. Cognitive evaluation revealed executive deficits in keeping with subcortical-frontal dysfunction, but no cortical deficits in language, perceptuospatial skills or praxis. The patient with NIFID was older and exhibited aphasia and dyspraxia. No patient had clinical evidence of motor neurone disease during life, or a mutation in the FUS gene. In the complementary clinical study of 312 patients with clinical syndromes of FTLD, genetic analysis revealed a 6 bp deletion in FUS in 3 patients, of questionable significance. One presented a prototypical picture of FTD, another expressive language disorder, and the third semantic dementia. None showed the early onset age or distinctive ‘stereotypic’ picture of patients with aFTLD-U. We conclude that aFTLD-U is associated with a distinct clinical form of frontotemporal dementia, potentially allowing identification of such patients in life with a high degree of precision. Whether mutations in the FUS gene cause some cases of FTLD remains unresolved.

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Acknowledgments

We thank all staff at the Neuropathology Department, Newcastle General Hospital, and Histopathology Department, Salford Royal Hospitals NHS Foundation Trust, for technical assistance, particularly Andrew Brown and Janet Thompson at Newcastle for cutting and staining of the sections and Lynne Ramsay for the TDP43 staining. Dr E. Jaros, Andrew Brown and Lynne Ramsay have been supported by the UK NIHR Biomedical Research Centre for Ageing and Age-related disease award to the Newcastle upon Tyne Hospitals NHS Foundation Trust. Quan Hu is supported through 111 Project funding to Professor Jinzhou Tian from People’s Republic of China. We also acknowledge the support of Alzheimer’s Research Trust and Alzheimer’s Society through their funding of the Manchester Brain Bank under the Brains for Dementia Research (BDR) initiative. D.M.A.M. and S.P.B. also receive funding from MRC and Wellcome Trust which supported this study in part.

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Authors and Affiliations

  1. Mental Health and Neurodegeneration Research Group, Faculty of Human and Medical Sciences, University of Manchester, Manchester, UK

    Julie S. Snowden, Quan Hu, Sara Rollinson, Nicola Halliwell, Andrew Robinson, Yvonne S. Davidson, Anna Richardson, Stuart M. Pickering-Brown, David Neary & David M. A. Mann

  2. Mental Health and Neurodegeneration Research Group, Cerebral Function Unit, Greater Manchester Neuroscience Centre, Salford Royal Foundation NHS Trust, Salford, M6 8HD, UK

    Julie S. Snowden, Anna Richardson, David Neary & David M. A. Mann

  3. The Neurology Centre, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, People’s Republic of China

    Quan Hu

  4. Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, USA

    Parastoo Momeni

  5. Department of Neuropathology, Walton Centre for Neurology and Neurosurgery, Liverpool, UK

    Atik Baborie

  6. Cognitive Neurology Clinic, Newcastle General Hospital, Newcastle University, Newcastle upon Tyne, UK

    Timothy D. Griffiths

  7. Neuropathology/Cellular Pathology, Royal Victoria Infirmary, Newcastle upon Tyne, UK

    Evelyn Jaros & Robert H. Perry

  8. Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle upon Tyne, NE4 5PL, UK

    Evelyn Jaros

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  1. Julie S. Snowden
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Snowden, J.S., Hu, Q., Rollinson, S. et al. The most common type of FTLD-FUS (aFTLD-U) is associated with a distinct clinical form of frontotemporal dementia but is not related to mutations in the FUS gene. Acta Neuropathol 122, 99–110 (2011). https://doi.org/10.1007/s00401-011-0816-0

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