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While the functions of m6A in the development of the mammalian brain have been extensively studied, its role in synaptic plasticity, and brain function remain underexplored. The involvement of this modification in Parkinson\u2019s disease and other synucleinopathies has only recently been studied, and needs further investigation. Here, we investigated the m6A epitranscriptome using MeRIP-seq in A30P-aSyn transgenic mice (aSyn Tg). We observed hypermethylation of synaptic genes in young aSyn Tg mice compared to age-matched control mice. The methylation was reduced during ageing. Using immunofluorescence imaging and biochemical analysis, we further investigated the levels and distribution of m6A regulatory enzymes\u2014writer, METTL3, reader, YTHDF1, and eraser, FTO, in the cortex, striatum, hippocampus, and cerebellum of aSyn Tg and control mice, and in primary cortical neuronal cultures. While the levels of these proteins were similar, METTL3 was found in the nucleus and in the post-synaptic compartment in neurons, suggesting it may play a role in methylation at the post-synapse. Our findings suggest that alterations in the regulation of m6A RNA methylation may be associated with neurodegeneration and ageing and it may play a significant role at the synapse.\n                  <\/jats:p>","DOI":"10.1038\/s41531-026-01362-3","type":"journal-article","created":{"date-parts":[[2026,5,6]],"date-time":"2026-05-06T18:05:42Z","timestamp":1778090742000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["The epitranscriptomic m6A RNA modification modulates the synapse in ageing and in a mouse model of synucleinopathy"],"prefix":"10.1038","volume":"12","author":[{"given":"Avika","family":"Chopra","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mary","family":"Xylaki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fanzheng","family":"Yin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ricardo","family":"Castro-Hern\u00e1ndez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Madiha","family":"Merghani","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valentina","family":"Grande","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brit","family":"Mollenhauer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andr\u00e9","family":"Fischer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tiago F.","family":"Outeiro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,5,6]]},"reference":[{"key":"1362_CR1","doi-asserted-by":"publisher","first-page":"635","DOI":"10.1016\/j.cell.2007.02.006","volume":"128","author":"AD Goldberg","year":"2007","unstructured":"Goldberg, A. 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