{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T01:56:10Z","timestamp":1790560570416,"version":"4.1.0"},"reference-count":80,"publisher":"Oxford University Press (OUP)","issue":"9","license":[{"start":{"date-parts":[[2026,9,12]],"date-time":"2026-09-12T00:00:00Z","timestamp":1789171200000},"content-version":"vor","delay-in-days":11,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,2]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Mammalian sex chromosomes harbor ampliconic gene families, which are multicopy genes with \u226597% sequence identity, predominantly expressed in testis tissue and essential for male fertility. The amplification of testis-specific genes is conserved across mammals, yet the specific gene families that expand show striking lineage-specific variation. Previous studies suggest a dynamic turnover with adaptive evolution for several of these families, but their analysis has been limited by the quality of reference genomes in repetitive regions. To characterize the molecular evolutionary processes of ampliconic gene families on both sex chromosomes, we analyzed telomere-to-telomere genome assemblies from eight primate species spanning 25 million years of evolution. We identified 53 X-linked and 19 Y-linked ampliconic gene families with dynamic copy number variation. Gene conversion through palindromic pairing and tandem arrays maintained high sequence similarity despite accumulating mutations. X-linked families maintained conserved chromosomal positions despite copy number changes, whereas Y-linked families showed frequent positional turnover. Strikingly, multiple X-linked families (GAGE, SSX, CSAG, and VCX) showed pervasive positive selection across the primate phylogeny and multiple (MAGEB, CT45, and HSFX) showed lineage-specific positive selection. Y-linked families predominantly evolve under purifying selection. Examining intraspecific copy number variation of the X-linked ampliconic families in chimpanzees, humans, and gorillas, we found variation among individuals but clear differences between species, with the largest families varying the most. These patterns could suggest that sperm competition, meiotic drive, or dosage-dependent selection drives the rapid, lineage-specific evolution of testis-expressed ampliconic genes in primates.<\/jats:p>","DOI":"10.1093\/gbe\/evag229","type":"journal-article","created":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T11:36:22Z","timestamp":1788867382000},"source":"Crossref","is-referenced-by-count":0,"title":["Pervasive Positive Selection on X-linked Ampliconic Genes in Primates"],"prefix":"10.1093","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-4858-8870","authenticated-orcid":false,"given":"Emma","family":"Diepeveen","sequence":"first","affiliation":[{"name":"Section for Bioinformatics and Computational Biology, Aarhus University , Aarhus ,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1557-734X","authenticated-orcid":false,"given":"Meritxell","family":"Riera Bell\u00e9s","sequence":"additional","affiliation":[{"name":"Section for Bioinformatics and Computational Biology, Aarhus University , Aarhus ,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5028-1790","authenticated-orcid":false,"given":"Mikkel","family":"Heide Schierup","sequence":"additional","affiliation":[{"name":"Section for Bioinformatics and Computational Biology, Aarhus University , Aarhus ,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,9,12]]},"reference":[{"key":"2026092721215809300_evag229-B1","doi-asserted-by":"publisher","first-page":"e1516","DOI":"10.7717\/peerj-cs.1516","article-title":"PyMC: a modern, and comprehensive probabilistic programming framework in python","volume":"9","author":"Abril-Pla","year":"2023","journal-title":"PeerJ Comput 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