Comparative analysis of sex chromosomes in Leporinus species (Teleostei, Characiformes) using chromosome painting

Background: The Leporinus genus, belonging to the Anostomidae family, is an interesting model for studies of sex chromosome evolution in fish, particularly because of the presence of heteromorphic sex chromosomes only in some species of the genus. In this study we used W chromosome-derived probes in a series of cross species chromosome painting experiments to try to understand events of sex chromosome evolution in this family.Results: W chromosome painting probes from Leporinus elongatus, L. macrocephalus and L. obtusidens were hybridized to each others chromosomes. The results showed signals along their W chromosomes and the use of L. elongatus W probe against L. macrocephalus and L. obtusidens also showed signals over the Z chromosome. No signals were observed when the later aforementioned probe was used in hybridization procedures against other four Anostomidae species without sex chromosomes.Conclusions: Our results demonstrate a common origin of sex chromosomes in L. elongatus, L. macrocephalus and L. obtusidens but suggest that the L. elongatus chromosome system is at a different evolutionary stage. The absence of signals in the species without differentiated sex chromosomes does not exclude the possibility of cryptic sex chromosomes, but they must contain other Leporinus W sequences than those described here. © 2013 Parise-Maltempi et al.; licensee BioMed Central Ltd.

A pintura de Jesuíno do Monte Carmelo na Igreja da Ordem Terceira do Carmo em São Paulo

Pós-graduação em Artes - IA

Una revisión crítica de los métodos de series de tiempo y de datos de panel aplicados al caso de la hipótesis de export-led growth

Incluye Bibliografía

Las encuestas de panel para el estudio de las condiciones de vida: bondades y restricciones

Incluye Bibliografía

Reacondicionamiento y reparación de contenedores: preparación y pintura de superficies = Refurbishment and repair of containers: surface preparation and painting

Incluye Bibliografía

Workshop on public participation in international negotiations on environmental matters: Panel on environmental justice and access rights for sustainable development in Latin America and the Caribbean

This publication was prepared with financial support from the United Nations Development Account and the project “Addressing critical socio-environmental challenges in Latin America and the Caribbean ”

Delimiting the Origin of a B Chromosome by FISH Mapping, Chromosome Painting and DNA Sequence Analysis in Astyanax paranae (Teleostei, Characiformes)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)