title: Supernumerary chromosome inheritance in the curimbatá (Prochilodus lineatus) of the Mogi-Guaçu River.
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.
authors.affiliation: Depto Ciências Biológicas, Faculdade de Ciências, Universidade Estadual Paulista (UNESP), Campus de Bauru, Bauru, SP, Brazil.
authors.forename: Tatiana Aparecida
authors.initials: TA
authors.lastname: Voltolin
authors.forename: José Augusto
authors.initials: JA
authors.lastname: Senhorini
authors.forename: Cláudio
authors.initials: C
authors.lastname: Oliveira
authors.forename: Fausto
authors.initials: F
authors.lastname: Foresti
authors.forename: Jehud
authors.initials: J
authors.lastname: Bortolozzi
authors.forename: Fábio
authors.initials: F
authors.lastname: Porto-Foresti
mesh_terms: D000818:Animals; D001938:Brazil; D002875:Chromosomes / Q000235:genetics*; D005399:Fishes / Q000235:genetics*; D040582:Inheritance Patterns / Q000235:genetics*; D007621:Karyotyping; D045483:Rivers