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The key regulator of the process is the transcriptional repressor LexA, which represses expression of DNA-repair\u2013related genes under nonstress conditions and undergoes self-cleavage to induce them under DNA-damaging conditions. Here, we gained insights into the SOS response and functional diversification of LexA in cyanobacteria by characterizing 2 model species, Synechocystis sp. PCC 6803 (S.6803) and Anabaena sp. PCC 7120 (A.7120), together with an early branching species Gloeobacter violaceus PCC 7421 (G.7421) whose LexA belongs to the same subclade as those of Candidatus Melainabacteria. After 3\u2005h of treatment with UV-C or UV-B, the amount of LexA in A.7120 and G.7421 decreased to 30% to 40% of pre-stress levels concomitant with the induction of DNA repair\u2013related genes, suggesting that LexA may function as a typical SOS repressor. In S.6803, on the other hand, we did not observe a decrease in LexA after treatment with UV radiation. This observation was consistent with previous studies reporting that LexA with substituted self-cleavage residues regulates expression of genes related to various cellular functions but not the SOS response in S.6803. The changes in gene expression profile of S.6803 after exposure to UV-C seemed to depend on transcription factors other than LexA, including the master regulator of photosynthetic genes, RpaB. In phototrophic cyanobacteria, the role of LexA as an SOS repressor may have become less important over the course of evolution, enabling LexA to diversify its functions in some species.<\/jats:p>","DOI":"10.1093\/plphys\/kiag102","type":"journal-article","created":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T12:54:20Z","timestamp":1772283260000},"source":"Crossref","is-referenced-by-count":0,"title":["The SOS response and functional diversification of the transcription factor LexA in cyanobacteria"],"prefix":"10.1093","volume":"200","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-0999-9284","authenticated-orcid":false,"given":"Haruka","family":"Kubodera","sequence":"first","affiliation":[{"name":"Graduate School of Science and Engineering, Saitama University , 255 Shimo-Okubo, Saitama 338-8570 ,","place":["Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiroki","family":"Inoue","sequence":"additional","affiliation":[{"name":"Department of Biochemistry and Molecular Biology, Faculty of Science, Saitama University , 255 Shimo-Okubo, Saitama 338-8570 ,","place":["Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Aoi","family":"Ando","sequence":"additional","affiliation":[{"name":"Graduate School of Science and Engineering, Saitama University , 255 Shimo-Okubo, Saitama 338-8570 ,","place":["Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5094-8882","authenticated-orcid":false,"given":"Tomoko","family":"Takahashi","sequence":"additional","affiliation":[{"name":"Graduate School of Science and Engineering, Saitama University , 255 Shimo-Okubo, Saitama 338-8570 ,","place":["Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1916-2053","authenticated-orcid":false,"given":"Yukako","family":"Hihara","sequence":"additional","affiliation":[{"name":"Graduate School of Science and Engineering, Saitama University , 255 Shimo-Okubo, Saitama 338-8570 ,","place":["Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2026,3,3]]},"reference":[{"key":"2026032009413215300_kiag102-B1","doi-asserted-by":"publisher","first-page":"13219","DOI":"10.1038\/ncomms13219","article-title":"Thousands of microbial genomes shed light on interconnected biogeochemical processes in an aquifer system","volume":"7","author":"Anantharaman","year":"2016","journal-title":"Nat Commun"},{"key":"2026032009413215300_kiag102-B2","doi-asserted-by":"publisher","first-page":"1126","DOI":"10.1111\/1574-6976.12077","article-title":"SOS, the formidable strategy of bacteria against aggressions","volume":"38","author":"Baharoglu","year":"2014","journal-title":"FEMS Microbiol Rev"},{"key":"2026032009413215300_kiag102-B3","doi-asserted-by":"publisher","first-page":"1809","DOI":"10.3389\/fmicb.2016.01809","article-title":"Comparative genomics of DNA recombination and repair in cyanobacteria: biotechnological implications","volume":"7","author":"Cassier-Chauvat","year":"2016","journal-title":"Front Microbiol"},{"key":"2026032009413215300_kiag102-B4","doi-asserted-by":"publisher","first-page":"677","DOI":"10.1099\/mic.0.043794-0","article-title":"Clp-dependent proteolysis of the LexA N-terminal domain in Staphylococcus aureus","volume":"157","author":"Cohn","year":"2011","journal-title":"Microbiology"},{"key":"2026032009413215300_kiag102-B5","doi-asserted-by":"publisher","first-page":"41","DOI":"10.1093\/genetics\/158.1.41","article-title":"Comparative gene expression profiles following UV exposure in wild-type and SOS-deficient Escherichia coli","volume":"158","author":"Courcelle","year":"2001","journal-title":"Genetics"},{"key":"2026032009413215300_kiag102-B6","doi-asserted-by":"publisher","first-page":"65","DOI":"10.1111\/j.1365-2958.2004.04100.x","article-title":"Function and regulation of the cyanobacterial genes lexA, recA and ruvB: lexA is critical to the survival of cells facing inorganic carbon starvation","volume":"53","author":"Domain","year":"2004","journal-title":"Mol Microbiol"},{"key":"2026032009413215300_kiag102-B7","doi-asserted-by":"publisher","first-page":"329","DOI":"10.1080\/09670269910001736392","article-title":"UV protection in cyanobacteria","volume":"34","author":"Ehling-Schulz","year":"1999","journal-title":"Eur J Phycol"},{"key":"2026032009413215300_kiag102-B8","doi-asserted-by":"publisher","first-page":"637","DOI":"10.1111\/j.1574-6976.2007.00082.x","article-title":"Aeons of distress: an evolutionary perspective on the bacterial SOS response","volume":"31","author":"Erill","year":"2007","journal-title":"FEMS Microbiol Rev"},{"key":"2026032009413215300_kiag102-B9","doi-asserted-by":"publisher","first-page":"1141","DOI":"10.1093\/jxb\/ern356","article-title":"Identification of the proteomic changes in Synechocystis sp. 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