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Post-translational modifications (PTMs) of the causative proteins play an important role in the etiology of disease as they could either slow down or accelerate the disease progression. Alzheimer disease is associated with the aggregation and accumulation of two major protein aggregates\u2014intracellular neurofibrillary tangles made up of microtubule-associated protein Tau and extracellular Amyloid-\u03b2 plaques. Post-translational modifications are important for the regulation of Tau`s function but an imbalance in PTMs may lead to abnormal Tau function and aggregation. Tau methylation is one of the important PTM of Tau in its physiological state. However, the methylation signature on Tau lysine changes once it acquires pathological aggregated form. Tau methylation can compete with other PTMs such as acetylation and ubiquitination. The state of PTM at these sites determines the fate of Tau protein in terms of its function and stability. The global methylation in neurons, microglia and astrocytes are involved in multiple cellular functions involving their role in epigenetic regulation of gene expression via DNA methylation. Here, we have discussed the effect of methylation on Tau function in a site-specific manner and their cross-talk with other lysine modifications. We have also elaborated the role of methylation in epigenetic aspects and neurodegenerative conditions associated with the imbalance in methylation metabolism affecting global methylation state of cells.<\/jats:p>","DOI":"10.1186\/s12964-021-00732-z","type":"journal-article","created":{"date-parts":[[2021,5,7]],"date-time":"2021-05-07T11:05:03Z","timestamp":1620385503000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":107,"title":["Methylation as a key regulator of Tau aggregation and neuronal health in Alzheimer\u2019s disease"],"prefix":"10.1186","volume":"19","author":[{"given":"Abhishek Ankur","family":"Balmik","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5468-2129","authenticated-orcid":false,"given":"Subashchandrabose","family":"Chinnathambi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,5,7]]},"reference":[{"key":"732_CR1","doi-asserted-by":"publisher","first-page":"215","DOI":"10.1111\/j.1365-2990.2004.00558.x","volume":"30","author":"E Agorogiannis","year":"2004","unstructured":"Agorogiannis E, Agorogiannis G, Papadimitriou A, Hadjigeorgiou G. 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