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This diversity is reflected in the karyotype variability of the tribe, with a huge number of chromosomal rearrangements involving autosomal, sex, and B chromosomes. Supernumerary B chromosomes were described for more than 10 species, four of them belonging to the genus\n                    <jats:italic>Holochilus<\/jats:italic>\n                    . Therefore, we sequenced the genome of two\n                    <jats:italic>H. nanus<\/jats:italic>\n                    specimens with different karyotypes: a female with (HNA-XXB) and a male without (HNA-XY) a B chromosome. We also sequenced previously flow-sorted chromosomes from this species: two B (HNA-B1, HNA-B2) and the Y chromosome (HNA-Y). Genome assemblies of HNA-XY and HNA-XXB were compared, enabling the identification of ancient genome duplications that could result from fragments of the B chromosome. In addition, more than fifty scaffolds containing sequence blocks shared between the libraries of HNA-B1, HNA-B2, and HNA-Y were found. The sequence blocks mapped in metaphases of\n                    <jats:italic>H. nanus<\/jats:italic>\n                    presented hybridization signals on the centromeric region of the chromosomes, highlighting that the centromeric composition of\n                    <jats:italic>H. nanus<\/jats:italic>\n                    is highly variable. In addition, qPCR and RT-qPCR analysis evidenced that these sequences are expressed, indicating a role in the genome structure. Briefly, supernumeraries of\n                    <jats:italic>H. nanus<\/jats:italic>\n                    appear to be a mosaic of the genome and may contain genes and sequences crucial for its maintenance, in addition to its repetitive DNA fraction.\n                  <\/jats:p>","DOI":"10.1007\/s00335-026-10205-8","type":"journal-article","created":{"date-parts":[[2026,3,7]],"date-time":"2026-03-07T15:39:50Z","timestamp":1772897990000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Genome assembly of the Neotropical marsh rat Holochilus nanus (Cricetidae: Sigmodontinae) brings insights on B and sex chromosome evolution"],"prefix":"10.1007","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9490-5457","authenticated-orcid":false,"given":"Camila Nascimento","family":"Moreira","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2511-1746","authenticated-orcid":false,"given":"Jordana","family":"Oliveira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8879-0542","authenticated-orcid":false,"given":"Yatiyo","family":"Yonenaga-Yassuda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9020-8002","authenticated-orcid":false,"given":"Valter Arag\u00e3o","family":"do Nascimento","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9042-1823","authenticated-orcid":false,"given":"Ivan Rodrigo","family":"Wolf","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3534-974X","authenticated-orcid":false,"given":"Cesar","family":"Martins","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,3,7]]},"reference":[{"issue":"3","key":"10205_CR1","doi-asserted-by":"publisher","first-page":"403","DOI":"10.1016\/S0022-2836(05)80360-2","volume":"215","author":"SF Altschul","year":"1990","unstructured":"Altschul SF, Gish W, Miller W, Myers EW, Lipman DJ (1990) Basic local alignment search tool. 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