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• W4307306508 abstract "ABSTRACT Frontotemporal lobar degeneration (FTLD) is an umbrella term describing the neuropathology of a clinically, genetically and pathologically heterogeneous group of diseases, including frontotemporal dementia (FTD) and progressive supranuclear palsy (PSP). Among the major FTLD pathological subgroups, FTLD with TDP-43 positive inclusions (FTLD-TDP) and FTLD with tau positive inclusions (FTLD-tau) are the most common, representing about 90% of the cases. Although alterations in DNA methylation have been consistently associated with neurodegenerative diseases, including Alzheimer’s disease and Parkinson’s disease, little is known for FTLD and its heterogeneous subgroups and subtypes. The main goal of this study was to investigate DNA methylation variation in FTLD-TDP and FTLD-tau. We used frontal cortex genome-wide DNA methylation profiles from three FTLD cohorts (234 individuals), generated using the Illumina 450K or EPIC microarray. We performed epigenome-wide association studies (EWAS) for each cohort followed by meta-analysis to identify shared differential methylated loci across FTLD subgroups/subtypes. Additionally, we used weighted gene correlation network analysis to identify co-methylation signatures associated with FTLD and other disease-related traits. Wherever possible, we also incorporated relevant gene/protein expression data. After accounting for a conservative Bonferroni multiple testing correction, the EWAS meta-analysis revealed two differentially methylated loci in FTLD, one annotated to OTUD4 (5’UTR-shore) and the other to NFATC1 (gene body-island). Of these loci, OTUD4 showed consistent upregulation of mRNA and protein expression in FTLD. Additionally, in the three independent co-methylation networks, OTUD4 -containing modules were enriched for EWAS meta-analysis top loci and were strongly associated with the FTLD status. These co-methylation modules were enriched for genes implicated in the ubiquitin system, RNA/stress granule formation and glutamatergic synaptic signalling. Altogether, our findings identified novel FTLD-associated loci, and support a role for DNA methylation as a mechanism involved in the dysregulation of biological processes relevant to FTLD, highlighting novel potential avenues for therapeutic development." @default.
• W4307306508 created "2022-10-31" @default.
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• W4307306508 date "2022-10-22" @default.
• W4307306508 modified "2023-10-09" @default.
• W4307306508 title "Brain DNA methylomic analysis of frontotemporal lobar degeneration reveals<i>OTUD4</i>in shared dysregulated signatures across pathological subtypes" @default.
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• W4307306508 doi "https://doi.org/10.1101/2022.10.21.513088" @default.

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