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Physiological tissue-specific and age-related reduction of mouse TDP-43 levels is regulated by epigenetic modifications
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Physiological tissue-specific and age-related reduction of mouse TDP-43 levels is regulated by epigenetic modifications
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Physiological tissue-specific and age-related reduction of mouse TDP-43 levels is regulated by epigenetic modifications
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Journal Article
Physiological tissue-specific and age-related reduction of mouse TDP-43 levels is regulated by epigenetic modifications
2022
Overview
The cellular level of TDP-43 (also known as TARDBP) is tightly regulated; increases or decreases in TDP-43 have deleterious effects in cells. The predominant mechanism responsible for the regulation of the level of TDP-43 is an autoregulatory negative feedback loop. In this study, we identified an in vivo cause-effect relationship between Tardbp gene promoter methylation and specific histone modification and the TDP-43 level in tissues of mice at two different ages. Furthermore, epigenetic control was observed in mouse and human cultured cell lines. In amyotrophic lateral sclerosis, the formation of TDP-43-containing brain inclusions removes functional protein from the system. This phenomenon is continuous but compensated by newly synthesized protein. The balance between sequestration and new synthesis might become critical with ageing, if accompanied by an epigenetic modification-regulated decrease in newly synthesized TDP-43. Sequestration by aggregates would then decrease the amount of functional TDP-43 to a level lower than those needed by the cell and thereby trigger the onset of symptoms.
Publisher
The Company of Biologists Ltd,The Company of Biologists
Subject
/ Amyotrophic lateral sclerosis
/ Amyotrophic Lateral Sclerosis - genetics
/ Amyotrophic Lateral Sclerosis - metabolism
/ Animals
/ Brain
/ DNA-Binding Proteins - genetics
/ DNA-Binding Proteins - metabolism
/ Genomes
/ Insects
/ Liver
/ Mice
/ Neuromuscular Disease Models
/ Protein-Folding Diseases: Models & Mechanisms
/ Proteins
/ rna
/ tardbp
/ tdp-43
