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The degree of sexual competition is a critical part of the social environment to which animals adjust their phenotypes, but the underlying genetic mechanisms are poorly understood. We conducted a study to investigate how differences in sperm competition risk affect the gene expression profiles of the testes and two brain areas (posterior pallium and optic tectum) in breeding male zebra finches (\n                    <jats:italic>Taeniopygia castanotis<\/jats:italic>\n                    ). In this pre-registered study, we investigated a large sample of 59 individual transcriptomes. We compared two experimental groups: males held in single breeding\u00a0pairs (low sexual competition)\n                    <jats:italic>versus<\/jats:italic>\n                    those held in two pairs (elevated sexual competition) per breeding cage. Using weighted gene co-expression network analysis (WGCNA), we observed significant effects of the social treatment in all three tissues. However, only the treatment effects found in the pallium were confirmed by an additional randomisation test for statistical robustness. Likewise, the differential gene expression analysis revealed treatment effects only in the posterior pallium (ten genes) and optic tectum (six genes). No treatment effects were found in the testis at the single gene level. Thus, our experiments do not provide strong evidence for transcriptomic adjustment specific to manipulated sperm competition risk. However, we did observe transcriptomic adjustments to the manipulated social environment in the posterior pallium. These effects were polygenic rather than based on few individual genes with strong effects. Our findings are discussed in relation to an accompanying paper using the same animals, which reports behavioural results consistent with the results presented here.\n                  <\/jats:p>","DOI":"10.1186\/s12864-024-10573-y","type":"journal-article","created":{"date-parts":[[2024,7,15]],"date-time":"2024-07-15T11:02:02Z","timestamp":1721041322000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Transcriptomic changes in the posterior pallium of male zebra finches associated with social niche conformance"],"prefix":"10.1186","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3317-3576","authenticated-orcid":false,"given":"Sepand","family":"Riyahi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3421-714X","authenticated-orcid":false,"given":"Navina D.","family":"Liebermann-Lilie","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7635-5447","authenticated-orcid":false,"given":"Arne","family":"Jacobs","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0814-9099","authenticated-orcid":false,"given":"Peter","family":"Korsten","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6841-0282","authenticated-orcid":false,"given":"Uwe","family":"Mayer","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3234-7335","authenticated-orcid":false,"given":"Tim","family":"Schmoll","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,7,15]]},"reference":[{"key":"10573_CR1","doi-asserted-by":"publisher","first-page":"352","DOI":"10.1086\/285542","volume":"142","author":"S Via","year":"1993","unstructured":"Via S. 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