Chromosomal features of nucleolar dominance in hybrids between the Neotropical fish Leporinus macrocephalus and Leporinus elongatus (Characiformes, Anostomidae)
| Autor: | Fausto Foresti, Diogo Teruo Hashimoto, Fábio Porto-Foresti, Jehud Bortolozzi, Alejandro Laudicina |
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| Rok vydání: | 2008 |
| Předmět: |
Male
Nucleolus Heterochromatin Zoology Plant Science Characiformes Anostomidae Chromosomes Epigenesis Genetic Genetics Nucleolus Organizer Region Animals Repeated sequence Ribosomal DNA In Situ Hybridization Fluorescence Hybrid Genes Dominant biology Fishes General Medicine biology.organism_classification Insect Science Neotropical fish Hybridization Genetic Animal Science and Zoology Female |
| Zdroj: | Genetica. 137(2) |
| ISSN: | 1573-6857 |
| Popis: | In the present study, the chromosomal mechanisms of nucleolar dominance were analyzed in the hybrid lineage “Piaupara,” which resulted from crossing the Leporinus macrocephalus female (Piaucu) and L. elongatus male (Piapara) fish. The analyses demonstrated that, in the hybrid, the nucleolar region inherited from L. elongatus presented higher activity, with expression in 100% of the cells, whereas the nucleolar region from L. macrocephalus appeared active at a frequency of 11.6%. The FISH technique with an 18S probe showed that the ribosomal DNA of the nucleolar region was not lost in the hybrid, and the results therefore demonstrated invariable marks in two chromosomes, each originating from one parent. An interesting difference between the nucleolar regions of the parental species was the association of the NOR with heterochromatic blocks (repetitive DNA) in L. elongatus, which could act as a determinative element in the establishment of this process. |
| Databáze: | OpenAIRE |
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