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Detection of underling proteinopathies is becoming increasingly important across neurodegenerative conditions due to upcoming disease intervention trials. In this review, we ex-plored how temporal lobe changes in amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) can potentially predict underlying TDP-43 pathology subtypes in FTD. To date, emphasis has been given to frontal lobe changes in the study of the cognitive and behavioural impairments in both syndromes but an increasing number of pathological, imaging and neuropsychological studies suggest how temporal lobe changes could critically affect the cognition and behaviour of these conditions. In this current article, we reviewed pathological, imaging as well as clinical/neuropsychological findings of temporal involvement in the ALS-FTD continuum, how they relate to temporal lobe changes and the underlying TDP-43 pathology in FTD. Findings across studies show that TDP-43 pathology occurs and coincides in many structures in ALS and FTD, but especially in the temporal lobes. In particular, anterior and medial temporal lobes atrophy is consistently found in ALS and FTD. In addition, memory and language impairment as well as emotional and Theory of Mind processing deficits that are characteristics of the two diseases are highly correlated to temporal lobe dysfunction. We conclude by showing that temporal lobe changes due to TDP-43 type B might be particular predictive of TDP-43 type B pathology in behavioural variant FTD, which clearly needs to be investigated further in the future.
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Table 1.
Summary of overlapping findings in ALS and FTD
ALS, amyotrophic lateral sclerosis; FTD; frontotemporal dementia; WM, white matter; GM, gray matter; TDP, TDP-43; ToM, theory of mind; ILF, inferior longitudinal fasciculus; CC, corpus callosum; AC, anterior commissure; UnF, uncinate fasciculus; SLF, superior longitudinal fasciculus; FOR, fornix; IC, internal cap-sula; CR, corona radiata; TP, temporal pole; PrG, parahippocampal gyrus; FG, fusiform gyrus; HF, hippocampal formation; A, amygdala; bvFTD, behavioural variant FTD; SD, semantic dementia; +, affected; –, not reported.
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