{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T15:01:09Z","timestamp":1788966069376,"version":"build-2803163510"},"reference-count":27,"publisher":"S. Karger AG","issue":"5","license":[{"start":{"date-parts":[[2021,1,1]],"date-time":"2021-01-01T00:00:00Z","timestamp":1609459200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/www.karger.com\/Services\/SiteLicenses"},{"start":{"date-parts":[[2021,1,1]],"date-time":"2021-01-01T00:00:00Z","timestamp":1609459200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.karger.com\/Services\/SiteLicenses"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cytogenet Genome Res"],"published-print":{"date-parts":[[2021]]},"abstract":"<jats:p>B chromosomes occur in different species of the small characid fishes of the genus &lt;i&gt;Moenkhausia.&lt;\/i&gt; These supernumerary elements, that do not recombine with chromosomes of the standard A complement and follow their own evolutionary mechanism vary in number, morphology, and distribution. Here, we show karyotypic data of individuals of 2 populations of &lt;i&gt;Moenkhausia oligolepis&lt;\/i&gt; of the Brazilian Amazon (Pedro Correia and Taboquinha streams, Tocantins river basin), both with a diploid number of 50 chromosomes and karyotypic formula of 10m + 32sm + 8a. In addition to the normal complement, we also observed the occurrence of B chromosomes in the 2 populations with intra- and interindividual variation ranging from 0 to 10 Bs, independent of sex. The C-banding pattern evidenced heterochromatic blocks located mainly in the pericentromeric region of the chromosomes, while the B chromosomes appeared euchromatic. Silver-stained nucleolus organizer regions were identified in multiples sites, and some of these blocks were positive when stained with chromomycin A&lt;sub&gt;3.&lt;\/sub&gt; The karyotype analysis and the application of whole-chromosome painting in populations of &lt;i&gt;M. oligolepis&lt;\/i&gt; reinforce the conservation of the basal diploid number for the genus, as well as the evolutionary tendency in these fishes to carry B chromosomes. Both populations turned out to be in different stages of stability and expansion of their B chromosomes. We further suggest that the origin of these chromosomes is due to the formation of isochromosomes. Here, we identified a pair of complement A chromosomes involved in this process. <\/jats:p>","DOI":"10.1159\/000517091","type":"journal-article","created":{"date-parts":[[2021,8,25]],"date-time":"2021-08-25T21:00:45Z","timestamp":1629925245000},"page":"249-256","source":"Crossref","is-referenced-by-count":3,"title":["Chromosomal Instability and Origin of B Chromosomes in the Amazonian Glass Tetra &lt;b&gt;&lt;i&gt;Moenkhausia oligolepis&lt;\/i&gt;&lt;\/b&gt; (G\u00fcnther, 1864) (Characiformes, Characidae)"],"prefix":"10.1159","volume":"161","author":[{"given":"Luana Pereira","family":"dos Santos","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carine M.","family":"Francisco","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Edimar O.","family":"Campos J\u00fanior","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0887-1081","authenticated-orcid":false,"given":"Jonathan P.","family":"Castro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ricardo","family":"Utsunomia","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sandra","family":"Morelli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F\u00e1bio","family":"Porto-Foresti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fausto","family":"Foresti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roberto 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