TDP-43 pathology in a patient carrying G2019S LRRK2mutation and a novel p.Q124E MAPT

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Abstract

Leucine-rich repeat kinase 2 (LRRK2) mutation is the most common cause of genetic-related parkinsonism and is usually associated with Lewy body pathology; however, tau, α-synuclein, and ubiquitin pathologies have also been reported. We report the case of a patient carrying the LRRK2 G2019S mutation and a novel heterozygous variant c.370C>G, p.Q124E in exon 4 of the microtubule-associated protein tau (MAPT). The patient developed parkinsonism with good levodopa response in her 70s. Neuropathological analysis revealed nigral degeneration and Alzheimer-type tau pathology without Lewy bodies. Immunohistochemical staining using phospho-TDP-43 antibodies identified occasional TDP-43 pathology in the hippocampus, temporal neocortex, striatum, and substantia nigra. However, TDP-43 pathology was not identified in another 4 archival LRRK2 G2019S cases with Lewy body pathology available in the Queen Square Brain Bank. Among other published cases of patients carrying LRRK2 G2019S mutation, only 3 were reportedly evaluated for TDP-43 pathology, and the results were negative. The role of the MAPT variant in the clinical and pathological manifestation in LRRK2 cases remains to be determined. © 2013 The Authors.

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Ling, H., Kara, E., Bandopadhyay, R., Hardy, J., Holton, J., Xiromerisiou, G., … Revesz, T. (2013). TDP-43 pathology in a patient carrying G2019S LRRK2mutation and a novel p.Q124E MAPT. Neurobiology of Aging, 34(12), 2889.e5-2889.e9. https://doi.org/10.1016/j.neurobiolaging.2013.04.011

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