Supernumerary chromosome inheritance in the curimbatá(Prochilodus lineatus) of the Mogi-Guaçu River

Tatiana Aparecida Voltolin,Jehud Bortolozzi,Fausto Foresti,Fábio Porto-Foresti,Cláudio Oliveira,José Augusto Senhorini

doi:10.1111/j.1601-5223.2009.02135.x

Tatiana Aparecida Voltolin, Jehud Bortolozzi + Show 4 more

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https://doi.org/10.1111/j.1601-5223.2009.02135.x

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Journal: Hereditas	Publication Date: Jun 1, 2010
Citations: 15	License type: cc-by

Affiliation: Universidade Estadual Paulista (Unesp)

Abstract

Prochilodus lineatus is widely used in pisciculture projects, mainly in the south of Brazil. It shows a basic karyotype composed of 2n = 54 chromosomes, in addition to as many as seven supernumerary chromosomes, also known as B-chromosomes. These additional small chromosomes are frequently heterochromatic, vary in number and morphology, and generally have no homology with the A complement. Intensive studies have investigated the function, origin and inheritance of these supernumerary chromosomes. The present study aimed to determine the inheritance pattern of the B-chromosomes resulting from directed cross-fertilization of P. lineatus, Prochilodontidae isolated from the Mogi-Guaçu River, Pirassununga, SP. These cross-fertilization experiments were performed at CEPTA/ICMBio in Pirassununga. The transmission patterns of these micro-chromosomes agreed (K(B)= 0.48) with the expectation of regular meiotic behavior following a Mendelian transmission model (K(B)= 0.5). A non-accumulation process was observed for these B-chromosomes in filial generations. Together, our results indicate that the supernumerary chromosomes in P. lineatus samples from the Mogi-Guaçu River exist in a neutral state and follow a Mendelian inheritance pattern.

Highlights

Prochilodus lineatus is widely used in pisciculture projects, mainly in the south of Brazil
The present study aimed to determine the inheritance pattern of the B-chromosomes resulting from directed cross-fertilization of P. lineatus, Prochilodontidae isolated from the Mogi-Guaçu River, Pirassununga, SP
Our results indicate that the supernumerary chromosomes in P. lineatus samples from the Mogi-Guaçu River exist in a neutral state and follow a Mendelian inheritance pattern

Summary

Introduction

Prochilodus lineatus is widely used in pisciculture projects, mainly in the south of Brazil. The present study aimed to determine the inheritance pattern of the B-chromosomes resulting from directed cross-fertilization of P. lineatus, Prochilodontidae isolated from the Mogi-Guaçu River, Pirassununga, SP. Our results indicate that the supernumerary chromosomes in P. lineatus samples from the Mogi-Guaçu River exist in a neutral state and follow a Mendelian inheritance pattern. The eukaryotic genome is not always restricted to genes found in the A chromosome set It frequently contains a set of supernumerary elements that do not seem to follow the rules of Mendelian inheritance (CAMACHO et al 2000). A primary characteristic of these chromosomes is their lack of recombination with complementary chromosomes These supernumerary DNA elements tend to propagate through a separate evolutionary path (CAMACHO et al 2000). Genetic control of these transmission patterns has been demonstrated in some animals, including the grasshopper Myrmeleotettix maculatus (SHAW and HEWITT 1985; SHAW et al 1985), mealy bug Pseudococus affinis (NUR and BRETT 1987, 1988), the grasshopper Eyprepocnemis plorans (HERRERA et al 1996) and in some plants including Hypochoeris maculata (PARKER et al 1982), Aegilops speltoides (CEBRIÁ et al 1994), and Allium schoenoprassum (BOUGOURD and PLOWMAN 1996)

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