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

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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 (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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Voltolin, T. A., Senhorini, J. A., Oliveira, C., Foresti, F., Bortolozzi, J., & Porto-Foresti, F. (2010). Supernumerary chromosome inheritance in the curimbatá (Prochilodus lineatus) of the Mogi-Guaçu River. Hereditas, 147(3), 127–131. https://doi.org/10.1111/j.1601-5223.2009.02135.x

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