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One common pathomechanism of these conditions is the repeat-associated non-AUG-initiated (RAN) translation of CGG repeats of mutant\n                    <jats:italic>FMR1<\/jats:italic>\n                    mRNA, resulting in production of FMRpolyG, a toxic protein containing long polyglycine tract. To identify novel modifiers of RAN translation we used an RNA-tagging system and mass spectrometry-based screening. It revealed proteins enriched on CGGexp-containing\n                    <jats:italic>FMR1<\/jats:italic>\n                    RNA in cellulo, including a ribosomal protein RPS26, a component of the 40 S subunit. We demonstrated that depletion of RPS26 and its chaperone TSR2, modulates FMRpolyG production and its toxicity. We also found that the RPS26 insufficiency impacted translation of limited number of proteins, and 5\u2019UTRs of mRNAs encoding these proteins were short and guanosine and cytosine-rich. Moreover,\n                    <jats:italic>the<\/jats:italic>\n                    silencing of another component of the 40 S subunit, the ribosomal protein RPS25, also induced repression of FMRpolyG biosynthesis. Results of this study suggest that the two 40 S ribosomal proteins and chaperone TSR2 play an important role in noncanonical CGGexp-related RAN translation.\n                  <\/jats:p>","DOI":"10.7554\/elife.98631","type":"journal-article","created":{"date-parts":[[2024,7,1]],"date-time":"2024-07-01T11:27:24Z","timestamp":1719833244000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.98631","source":"Crossref","is-referenced-by-count":9,"title":["Insufficiency of 40S ribosomal proteins, RPS26 and RPS25, negatively affects biosynthesis of polyglycine-containing proteins in fragile-X associated conditions"],"prefix":"10.7554","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2801-9956","authenticated-orcid":true,"given":"Katarzyna","family":"Tutak","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/04g6bbq64","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Gene Expression, Institute of Molecular Biology and Biotechnology, Adam 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