{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T01:03:36Z","timestamp":1790730216937,"version":"4.1.0"},"reference-count":83,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2024,9,3]],"date-time":"2024-09-03T00:00:00Z","timestamp":1725321600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Italian Ministry of Health"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Genes"],"abstract":"<jats:p>Structural Maintenance of Chromosomes (SMC) complexes are an evolutionary conserved protein family. In most eukaryotes, three SMC complexes have been characterized, as follows: cohesin, condensin, and SMC5\/6 complexes. These complexes are involved in a plethora of functions, and defects in SMC genes can lead to an increased risk of chromosomal abnormalities, infertility, and cancer. To investigate the evolution of SMC complex genes in mammals, we analyzed their selective patterns in an extended phylogeny. Signals of positive selection were identified for condensin NCAPG, for two SMC5\/6 complex genes (SMC5 and NSMCE4A), and for all cohesin genes with almost exclusive meiotic expression (RAD21L1, REC8, SMC1B, and STAG3). For the latter, evolutionary rates correlate with expression during female meiosis, and most positively selected sites fall in intrinsically disordered regions (IDRs). Our results support growing evidence that IDRs are fast evolving, and that they most likely contribute to adaptation through modulation of phase separation. We suggest that the natural selection signals identified in SMC complexes may be the result of different selective pressures: a host-pathogen arms race in the condensin and SMC5\/6 complexes, and an intragenomic conflict for meiotic cohesin genes that is similar to that described for centromeres and telomeres.<\/jats:p>","DOI":"10.3390\/genes15091159","type":"journal-article","created":{"date-parts":[[2024,9,3]],"date-time":"2024-09-03T08:38:47Z","timestamp":1725352727000},"page":"1159","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Positive Selection Drives the Evolution of the Structural Maintenance of Chromosomes (SMC) Complexes"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9291-5352","authenticated-orcid":false,"given":"Diego","family":"Forni","sequence":"first","affiliation":[{"name":"Computational Biology Unit, Scientific Institute IRCCS E. MEDEA, 23842 Bosisio Parini, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3911-1042","authenticated-orcid":false,"given":"Alessandra","family":"Mozzi","sequence":"additional","affiliation":[{"name":"Computational Biology Unit, Scientific Institute IRCCS E. MEDEA, 23842 Bosisio Parini, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2267-5266","authenticated-orcid":false,"given":"Manuela","family":"Sironi","sequence":"additional","affiliation":[{"name":"Computational Biology Unit, Scientific Institute IRCCS E. MEDEA, 23842 Bosisio Parini, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2670-3532","authenticated-orcid":false,"given":"Rachele","family":"Cagliani","sequence":"additional","affiliation":[{"name":"Computational Biology Unit, Scientific Institute IRCCS E. MEDEA, 23842 Bosisio Parini, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,9,3]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"399","DOI":"10.1038\/nrm.2016.30","article-title":"SMC Complexes: From DNA to Chromosomes","volume":"17","author":"Uhlmann","year":"2016","journal-title":"Nat. Rev. Mol. Cell Biol."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"326","DOI":"10.1016\/j.cell.2015.12.026","article-title":"SnapShot: SMC Protein Complexes Part I","volume":"164","author":"Haering","year":"2016","journal-title":"Cell"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"809","DOI":"10.1038\/s12276-024-01226-x","article-title":"Mechanism of Phase Condensation for Chromosome Architecture and Function","volume":"56","author":"Park","year":"2024","journal-title":"Exp. Mol. 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