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Chromosome markers in Hoplias malabaricus (Characiformes, Erythrinidae): comparative cytogenetics among cytotypes

Grant number: 07/05565-5
Support type:Scholarships in Brazil - Master
Effective date (Start): March 01, 2008
Effective date (End): February 28, 2010
Field of knowledge:Biological Sciences - Genetics
Principal Investigator:Luiz Antonio Carlos Bertollo
Grantee:Marcelo de Bello Cioffi
Home Institution: Centro de Ciências Biológicas e da Saúde (CCBS). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

Hoplias malabaricus is a neotropical freshwater fish that must correspond to a species complex. Conspicuous karyotypic diversification occurs among populations, with seven recognized cytotypes (A-G). Based on their general macrokaryotypic features, the cytotypes can be arranged in two major chromosomal groups, one composed by the cytotypes A, B, C, D (Cluster 1) and another by the cytotypes E, F, G (Cluster 2). The main purpose of this study is to improve the karyotypic data on the clustering of the cytotypes A-D in an evolutionary major group, using chromosome markers that include classic and molecular cytogenetic data (C-bands, Ag-NORs, fluorochrome positive sites, location of the ribosomal genes). It will also be looked to investigate the derivation of the cytotype D (2n=40/39 chromosomes in the females and the males, respectively, with a exclusive X1X1X2X2/X1X2Y sex chromosome system) from the cytotype C (2n=40 chromosomes, without a differentiated sex system). Thus, in a general way, it will be focused and analyzed the biodiversity of our ichthyofauna, particularly related to H. malabaricus, a fish group with problematic taxonomy and systematics. (AU)

Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
CIOFFI, M. B.; BERTOLLO, L. A. C. Initial steps in XY chromosome differentiation in Hoplias malabaricus and the origin of an X1X2Y sex chromosome system in this fish group. HEREDITY, v. 105, n. 6, p. 554-561, DEC 2010. Web of Science Citations: 44.
CIOFFI, M. B.; MARTINS, C.; VICARI, M. R.; REBORDINOS, L.; BERTOLLO, L. A. C. Differentiation of the XY Sex Chromosomes in the Fish Hoplias malabaricus (Characiformes, Erythrinidae): Unusual Accumulation of Repetitive Sequences on the X Chromosome. SEXUAL DEVELOPMENT, v. 4, n. 3, p. 176-185, 2010. Web of Science Citations: 33.
CIOFFI, MARCELO B.; MARTINS, CESAR; BERTOLLO, LUIZ A. C. Comparative chromosome mapping of repetitive sequences. Implications for genomic evolution in the fish, Hoplias malabaricus. BMC GENETICS, v. 10, JUL 7 2009. Web of Science Citations: 45.
CIOFFI, M. B.; MARTINS, C.; CENTOFANTE, L.; JACOBINA, U.; BERTOLLO, L. A. C. Chromosomal Variability among Allopatric Populations of Erythrinidae Fish Hoplias malabaricus: Mapping of Three Classes of Repetitive DNAs. Cytogenetic and Genome Research, v. 125, n. 2, p. 132-141, 2009. Web of Science Citations: 54.

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