Lurdes Foresti de Almeida-Toledo
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Lurdes Foresti de Almeida-Toledo has a total of 19 co-authors. Here are the top co-authors by number of shared publications:
- Alberto Akama
Museu Paraense Emílio Goeldi
1 shared publication - Anete Pereira de Souza
Center for Plant Molecular Breeding (CeM²P), University of Campinas (UNICAMP), Brazil
1 shared publication - Axel Meyer
Department of Biology, University of Konstanz , Konstanz
1 shared publication Bianca Dazzani
Universidade de São Paulo, Brazil
1 shared publicationC B Moysés
Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
1 shared publicationCarlos E. Lopes
Universidade de São Paulo, Brazil
1 shared publication
Latest Publications
- Open Access
- 1 September 2012
- Published by FapUNIFESP (SciELO) in Neotropical Ichthyology
- Vol. 10 (3) , 623-632
Cytogenetic and molecular analyses in troglobitic and epigean species of Pimelodella (Siluriformes: Heptapteridae) from Brazil
- 1 September 2012
- Published by FapUNIFESP (SciELO) in Neotropical Ichthyology
- Vol. 10 (3) , 623-632
Open AccessCytogenetic and molecular analyses in troglobitic and epigean species of Pimelodella (Siluriformes: Heptapteridae) from Brazil
- Open Access
- 23 June 2010
- Published by Springer Nature in Heredity
- Vol. 106 (2) , 391-400
Independent fusions and recent origins of sex chromosomes in the evolution and diversification of glass knife fishes (Eigenmannia)
The genus Eigenmannia comprises several species groups that display a surprising variety of diploid chromosome numbers and sex-determining systems. In this study, hypotheses regarding phylogenetic relationships and karyotype evolution were investigated using a combination of molecular and cytogenetic methods. Phylogenetic relationships were analyzed for 11 cytotypes based on sequences from five mitochondrial DNA regions. Parsimony-based character mapping of sex chromosomes confirms previous suggestions of multiple origins of sex chromosomes. Molecular cytogenetic analyses involved chromosome painting using probes derived from whole sex chromosomes from two taxa that were hybridized to metaphases of their respective sister cytotypes. These analyses showed that a multiple XY system evolved recently (Eigenmannia. The other chromosomal sex-determination system investigated is shown to have differentiated by an accumulation of heterochromatin on the X chromosome. This has occurred in the past 0.6 my, and is the most recent chromosomal sex-determining system described to date. These results show that the evolution of sex-determining systems can proceed very rapidly.
- 23 June 2010
- Published by Springer Nature in Heredity
- Vol. 106 (2) , 391-400
Open AccessIndependent fusions and recent origins of sex chromosomes in the evolution and diversification of glass knife fishes (Eigenmannia)
The genus Eigenmannia comprises several species groups that display a surprising variety of diploid chromosome numbers and sex-determining systems. In this study, hypotheses regarding phylogenetic relationships and karyotype evolution were investigated using a combination of molecular and cytogenetic methods. Phylogenetic relationships were analyzed for 11 cytotypes based on sequences from five mitochondrial DNA regions. Parsimony-based character mapping of sex chromosomes confirms previous suggestions of multiple origins of sex chromosomes. Molecular cytogenetic analyses involved chromosome painting using probes derived from whole sex chromosomes from two taxa that were hybridized to metaphases of their respective sister cytotypes. These analyses showed that a multiple XY system evolved recently (Eigenmannia. The other chromosomal sex-determination system investigated is shown to have differentiated by an accumulation of heterochromatin on the X chromosome. This has occurred in the past 0.6 my, and is the most recent chromosomal sex-determining system described to date. These results show that the evolution of sex-determining systems can proceed very rapidly.
- Open Access
- 1 January 2008
- Published by FapUNIFESP (SciELO) in Genetics and Molecular Biology
- Vol. 31 (1 suppl) , 227-230
Cytogenetic characterization of the strongly electric Amazonian eel, Electrophorus electricus (Teleostei, Gymnotiformes), from the Brazilian rivers Amazon and Araguaia
A karyotype analysis of the electric eel, Electrophorus electricus (Teleostei, Gymnotiformes), a strongly electric fish from northern South America, is presented. Two female specimens were analyzed, one from the Amazon River and one from the Araguaia River. The specimens had a chromosomal number of 2n = 52 (42M-SM + 10A). C-bands were present in a centromeric and pericentromeric position on part of the chromosomes; some interstitial C-bands were also present. Heteromorphic nucleolus organizer regions (NORs) were detected in two chromosome pairs of the specimen from the Amazon River. The chromosome number and karyotype characteristics are similar to those of other Gymnotidae species. The genera Electrophorus and Gymnotus are positioned as the basal lineages in the Gymnotiformes phylogeny.FAPESPCNP
- 1 January 2008
- Published by FapUNIFESP (SciELO) in Genetics and Molecular Biology
- Vol. 31 (1 suppl) , 227-230
Open AccessCytogenetic characterization of the strongly electric Amazonian eel, Electrophorus electricus (Teleostei, Gymnotiformes), from the Brazilian rivers Amazon and Araguaia
A karyotype analysis of the electric eel, Electrophorus electricus (Teleostei, Gymnotiformes), a strongly electric fish from northern South America, is presented. Two female specimens were analyzed, one from the Amazon River and one from the Araguaia River. The specimens had a chromosomal number of 2n = 52 (42M-SM + 10A). C-bands were present in a centromeric and pericentromeric position on part of the chromosomes; some interstitial C-bands were also present. Heteromorphic nucleolus organizer regions (NORs) were detected in two chromosome pairs of the specimen from the Amazon River. The chromosome number and karyotype characteristics are similar to those of other Gymnotidae species. The genera Electrophorus and Gymnotus are positioned as the basal lineages in the Gymnotiformes phylogeny.FAPESPCNP