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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Tracking the evolution of sex chromosome systems in Melanoplinae grasshoppers through chromosomal mapping of repetitive DNA sequences

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Author(s):
Palacios-Gimenez, Octavio M. [1] ; Castillo, Elio R. [2] ; Marti, Dardo A. [2] ; Cabral-de-Mello, Diogo C. [1]
Total Authors: 4
Affiliation:
[1] Univ Estadual Paulista, UNESP, Inst Biociencias IB, Dept Biol, Rio Claro, SP - Brazil
[2] Univ Nacl Misiones, Fac Ciencias Exactas Quim & Nat, IBS, Lab Genet Evolutiva, RA-3300 Posadas - Argentina
Total Affiliations: 2
Document type: Journal article
Source: BMC Evolutionary Biology; v. 13, AUG 9 2013.
Web of Science Citations: 34
Abstract

Background: The accumulation of repetitive DNA during sex chromosome differentiation is a common feature of many eukaryotes and becomes more evident after recombination has been restricted or abolished. The accumulated repetitive sequences include multigene families, microsatellites, satellite DNAs and mobile elements, all of which are important for the structural remodeling of heterochromatin. In grasshoppers, derived sex chromosome systems, such as neo-XY male/XX female and neo-X1X2Y male/X1X1X2X2 female, are frequently observed in the Melanoplinae subfamily. However, no studies concerning the evolution of sex chromosomes in Melanoplinae have addressed the role of the repetitive DNA sequences. To further investigate the evolution of sex chromosomes in grasshoppers, we used classical cytogenetic and FISH analyses to examine the repetitive DNA sequences in six phylogenetically related Melanoplinae species with X0 male/XX female, neo-XY male/XX female and neo-X1X2Y male/X1X1X2X2 female sex chromosome systems. Results: Our data indicate a non-spreading of heterochromatic blocks and pool of repetitive DNAs (C(0)t-1 DNA) in the sex chromosomes; however, the spreading of multigene families among the neo-sex chromosomes of Eurotettix and Dichromatos was remarkable, particularly for 5S rDNA. In autosomes, FISH mapping of multigene families revealed distinct patterns of chromosomal organization at the intra- and intergenomic levels. Conclusions: These results suggest a common origin and subsequent differential accumulation of repetitive DNAs in the sex chromosomes of Dichromatos and an independent origin of the sex chromosomes of the neo-XY and neo-X1X2Y systems. Our data indicate a possible role for repetitive DNAs in the diversification of sex chromosome systems in grasshoppers. (AU)

FAPESP's process: 12/01421-7 - 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)
Grantee:Octavio Manuel Palacios Gimenez
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 11/19481-3 - Contributions to elucidation of B chromosome biological roles using as model Rhammatocerus brasiliensis (Orthoptera) and Haplochromis obliquidens (Teleostei): structure, evolution and histone proteins modification patterns
Grantee:Diogo Cavalcanti Cabral de Mello
Support Opportunities: Regular Research Grants