Supernumerary chromosome inheritance in the curimbatá (Prochilodus lineatus) of the Mogi-Guaçu River
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2010-01-01
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Voltolin, Tatiana Aparecida [UNESP]
Senhorini, José Augusto
Oliveira, Cláudio [UNESP]
Foresti, Fausto [UNESP]
Bortolozzi, Jehud [UNESP]
Porto-Foresti, Fábio [UNESP]
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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 (KB = 0.48) with the expectation of regular meiotic behavior following a Mendelian transmission model (KB = 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. © 2010 The Authors.
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Hereditas, v. 147, n. 3, p. 127-131, 2010.