AI Article Synopsis
- The study focuses on a diverse neotropical fish genus with significant chromosome variability, including differences in karyotypic morphology and sex chromosome systems.
- Researchers analyzed two species using various cytogenetic techniques and molecular methods, revealing distinct karyotypes and repetitive sequence organizations.
- Findings include the occurrence of Robertsonian rearrangements and various dispersal mechanisms of repetitive sequences, highlighting the complexity of chromosome diversification in these fish species.
Article Abstract
is a highly diverse neotropical fish genus that exhibits extensive chromosomal variability, encompassing karyotypic morphology, diploid chromosome number (2n = 34-54), and the evolution of various types of sex chromosome systems. Robertsonian rearrangements related to unstable chromosomal sites are here described. Here, the karyotypes of two species were comparatively analyzed using classical cytogenetic techniques, in addition to isolation, cloning, sequencing, molecular characterization, and fluorescence in situ hybridization of repetitive sequences (i.e., 18S and 5S rDNA; U1, U2, and U5 snDNA; and telomere sequences). The species analyzed here have different karyotypes: sp. 1 (2n = 38, XX/XY) and (2n = 34, no heteromorphic sex chromosomes). Comparative mapping showed different organizations for the analyzed repetitive sequences: 18S and U1 sequences occurred in a single site in all populations of the analyzed species, while 5S and U2 sequences could occur in single or multiple sites. A sequencing analysis confirmed the identities of the U1, U2, and U5 snDNA sequences. Additionally, a syntenic condition for U2-U5 snDNA was found in . In a comparative analysis, the sequences of rDNA and U snDNA showed inter- and intraspecific chromosomal diversification. The occurrence of Robertsonian rearrangements and other dispersal mechanisms of repetitive sequences are discussed.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10532334 | PMC |
| http://dx.doi.org/10.3390/ijms241814159 | DOI Listing |
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