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Identification of a new repetitive element in the sex chromosomes of Leporinus elongatus (Teleostei : Characiformes : Anostomidae): new insights into the sex chromosomes of Leporinus
(Karger, 2007-01-01)
Leporinus elongatus represents an interesting model for studies on chromosome evolution since it possesses a conspicuous ZZ/ZW sex chromosome system that has been characterized mainly by basic cytogenetic techniques. In ...
Karyotypic diversity and evolutionary trends in the Neotropical catfish genus Hypostomus Lacepede, 1803 ( Teleostei, Siluriformes, Loricariidae)
(Pensoft Publishers, 2012-01-01)
The family Loricariidae with 813 nominal species is one of the largest fish families of the world. Hypostominae, its more complex subfamily, was recently divided into five tribes. The tribe Hypostomini is composed of a ...
Chromosome mapping of a Tc1-like transposon in species of the catfish Ancistrus
(2017-01-01)
The Tc1 mariner element is widely distributed among organisms and have been already described in different species of fish. The genus Ancistrus (Kner, 1854) has 68 nominal species and is part of an interesting taxonomic ...
XX:XY sex chromosome system with X heterochromatinization: An early stage of sex chromosome differentiation in the neotropic electric eel Eigenmannia virescens
(2001-12-01)
An early stage of sex chromosome differentiation is reported to occur in the electric eel Eigenmannia virescens (Pisces, Sternopygidae) from populations of two tributaries of the Paraná river system (Brazil). Cytogenetic ...
Trends in the karyotypic evolution of the Neotropical catfish family Heptapteridae Bockmann 1998 (Teleostei: Siluriformes)
(Springer, 2012-06-01)
The Heptapteridae family is endemic to the Neotropics and is one of the most representative members of the Siluriformes order in small bodies of water. Due the lack of data for clearly distinguishing their species, only ...
IGS sequences in Cestrum present AT- and GC-rich conserved domains, with strong regulatory potential for 5S rDNA
(2020-01-01)
The 35S and 5S ribosomal DNA (rDNA) organized in thousands of copies in genomes, have been widely used in numerous comparative cytogenetic studies. Nevertheless, several questions related to the diversity and organization ...
KARYOTYPE AND NUCLEOLUS ORGANIZER REGIONS OF Ophisternon aenigmaticum (Teleostei: Synbranchiformes: Synbranchidae) FROM VENEZUELA
(IntercienciaCaracasVenezuela, 2011)
Chromosome mapping of retrotransposable elements Rex1 and Rex3 in Leporinus Spix, 1829 species (Characiformes: Anostomidae) and its relationships among heterochromatic segments and W sex chromosome
(Taylor & Francis Group content, 2013-11-01)
The family Anostomidae is an interesting model for studies of repetitive elements, mainly because of the presence of high numbers of heterochromatic segments related to a peculiar system of female heterogamety, which is ...
Chromosomal mapping of repetitive sequences in Hyphessobrycon eques (Characiformes, Characidae): a special case of the spreading of 5S rDNA clusters in a genome
(2020-02-01)
Cytogenetic data showed a variation in diploid chromosome number in the genus Hyphessobrycon ranging from 2n = 46 to 52, and studies involving repetitive DNA sequences are scarce in representatives of this genus. The purpose ...