0436836 - BFÚ 2015 RIV CH eng J - Journal Article
Poltronieri, J. - Marquioni, V. - Bertollo, L.A.C. - Kejnovský, Eduard - Molina, W.F. - Liehr, T. - Cioffi, M.B.
Comparative Chromosomal Mapping of Microsatellites in Leporinus Species (Characiformes, Anostomidae): Unequal Accumulation on the W Chromosomes.
Cytogenetic and Genome Research. Roč. 142, č. 1 (2014), s. 40-45. ISSN 1424-8581. E-ISSN 1424-859X
R&D Projects: GA MŠMT(CZ) ED1.1.00/02.0068
Institutional support: RVO:68081707
Keywords : FISH * Heterochromatin * Molecular cytogenetics
Subject RIV: BO - Biophysics
Impact factor: 1.561, year: 2014

Approximately 90 species in the genus Leporinus (Characiformes, Anostomidae) are known, and most of them do not present differentiated sex chromosomes. However, there is a group of 7 species that share a heteromorphic ZW sex system. In all of these species, the W chromosome is the largest one in the karyotype and is mostly heterochromatic. We investigated the distribution of several microsatellites in the genome of 4 Leporinus species that possess ZW chromosomes. Our results showed a very large accumulation of mostly microsatellites on the W chromosomes. This finding supports the presence of an interconnection between heterochromatinization and the accumulation of repetitive sequences, which has been proposed for sex chromosome evolution, and suggests that heterochromatinization is the earlier of the 2 processes. In spite of the common origin that has been proposed for W chromosomes in all of the studied species, the microsatellites followed different evolutionary trajectories in each species, which indicates a high plasticity for sex chromosome differentiation. (C) 2013 S. Karger AG, Basel
Permanent Link: http://hdl.handle.net/11104/0240512