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Contributions to the knowledge of structure, origin and evolution od neo sex chromosomes in grasshoppers using as model species of the genera Chlorus, Dichromatos and Eurotettix (Melanoplinae: Acrididae)

Grant number: 12/01421-7
Support Opportunities:Scholarships in Brazil - Master
Start date: October 01, 2012
End date: February 28, 2014
Field of knowledge:Biological Sciences - Genetics - Animal Genetics
Principal Investigator:Diogo Cavalcanti Cabral de Mello
Grantee:Octavio Manuel Palacios Gimenez
Host Institution: Instituto de Biociências (IB). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil

Abstract

The analysis of experimental models for understanding the sex chromosome evolution advanced and nowadays cytogenetic and molecular data has been explored for this focus. The grasshoppers belonging to the subfamily Melanoplinae presents a wide diversification and in the new world this subfamily constitutes the largest Acrididae group, with 43 genera and 232 described species. On the chromosomal point to view this group presents wide variability for some species, with the occurrence of derived diploid numbers and sex mechanisms, as neo-XY/XX e neo-X1X2Y/X1X1X2X2. Although some chromosomal analysis have been performed in this group the studies are restrict to conventional analyses, and none aspect of repeated DNAs diversification and its possible role in the sex chromosome evolution were explored. Because of the occurrence of distinct sex mechanisms, in distinct evolutionary steps, the Melanoplinae are good models for understanding the patterns of origin/diversification of sex chromosomes. In this way, the objective of the present work is to analyze the structure and evolution of derived sex chromosomes (neo-XY/XX and neo-X1X2Y/X1X1X2X2), based in the analysis of repeated DNAs, such as multigene families, satellite DNAs, and transposable elements, besides the use of microdisected chromosomes, using as models the species belonging to the genera Chlorus, Dichromatos and Eurotettix. The analysis using molecular cytogenetic approaches in species with distinct sex systems will allow a better knowledge and the test of hypothesis concerning origin and evolution of these systems in Orthoptera, besides their possible role in the speciation process in the group.

News published in Agência FAPESP Newsletter about the scholarship:
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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)
PALACIOS-GIMENEZ, O. M.; MARTI, D. A.; CABRAL-DE-MELLO, D. C.. Neo-sex chromosomes of Ronderosia bergi: insight into the evolution of sex chromosomes in grasshoppers. CHROMOSOMA, v. 124, n. 3, p. 353-365, . (12/01421-7, 14/11763-8)
MENEZES-DE-CARVALHO, NAHANNA ZIMMERMANN; PALACIOS-GIMENEZ, OCTAVIO MANUEL; MILANI, DIOGO; CABRAL-DE-MELLO, DIOGO CAVALCANTI. High similarity of U2 snDNA sequence between A and B chromosomes in the grasshopper Abracris flavolineata. Molecular Genetics and Genomics, v. 290, n. 5, p. 1787-1792, . (14/02038-8, 12/01421-7, 11/19481-3)
PALACIOS-GIMENEZ, OCTAVIO M.; BUENO, DANILO; CABRAL-DE-MELO, DIOGO C.. Chromosomal mapping of two Mariner-like elements in the grasshopper Abracris flavolineata (Orthoptera: Acrididae) reveals enrichment in euchromatin. European Journal of Entomology, v. 111, n. 3, p. 329-334, . (12/01421-7, 11/19481-3)
PALACIOS-GIMENEZ, OCTAVIO M.; CASTILLO, ELIO R.; MARTI, DARDO A.; CABRAL-DE-MELLO, DIOGO C.. Tracking the evolution of sex chromosome systems in Melanoplinae grasshoppers through chromosomal mapping of repetitive DNA sequences. BMC Evolutionary Biology, v. 13, . (12/01421-7, 11/19481-3)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)