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Mitotic and meiotic analysis of B Chromosomes in Prochilodus lineatus from Mogi-Guaçu river.

Grant number: 12/05759-2
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): June 01, 2012
Effective date (End): December 31, 2013
Field of knowledge:Biological Sciences - Genetics - Animal Genetics
Principal Investigator:Fábio Porto-Foresti
Grantee:Aline Leão Valentim
Home Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil

Abstract

The species Prochilodus lineatus, popularly known as Curimbatá is widely distributed in the Neotropics, especially in the upper basin of the Parana River. Cytogenetic studies in this species showed a diploid number of 54 chromosomes, metacentric and submetacentric types, containing a range of zero to nine B chromosomes. These extra chromosomes are characterized by being heterochromatic, which normally do not show homology with the chromosomes of the complement A, and have a different frequency, size and morphology. In P. lineatus polymorphism was found in the microchromosomes B, may occur as acrocentric, metacentric and submetacentric. In addition, there are currently few studies focused on meiotic behavior of B chromosomes in fish, which makes it extremely important to conduct studies on the meiotic segregation of additional elements on fish populations carriers. The present study aims to analyze the mitotic and meiotic behavior of B microchromosomes found in P. lineatus, from the Mogi-Guaçu (Pirassununga, SP). These data will contribute to better understanding of the segregation of these elements genomics during the formation of genetics cells, which can cause variations in frequency and pattern of the transmission of these microchromosomes.