Heteromorphic sex chromosomes in three species of the genus &lt;i&gt;Leporinus &lt;/i&gt;(Pisces, Anostomidae)

Galetti, Pedro M.; Foresti, Fausto; Bertollo, L.A.C.; Filho, Orlando Moreira

doi:10.1159/000131562

Cited by 64 publications

(41 citation statements)

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“…The karyotype of L. elongatus of both the MogiGuaçú and the Paranapanema populations had 2n = 54 chromosomes for both sexes, with ZW sex chromosomes characterizing the female karyotype, as already reported by Galetti et al (1981). Most chromosomes are slightly heterochromatic in their telomeric regions, with some pairs presenting centromeric and/or pericentromeric blocks (Figure 1).…”

supporting

confidence: 61%

Chromosomal evidence of population subdivision in the freshwater fish Leporinus elongatus in the Upper Paraná River basin

2008

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Cytogenetic analyses performed in populations of the Neotropical freshwater fish Leporinus elongatus of the Upper Paraná River basin showed a chromosome polymorphism involving heterochromatic segments of the nucleolar organizing pair in this species. The NOR-bearing chromosome pair was characterized by two phenotypes identified by the absence (C 1 ) or presence (C 2 ) of a heterochromatic segment located in an interstitial position of the long arm in this pair. The meiotic segregation of these variations results in three distinct cytotypes, C 1 C 1 , C 1 C 2 and C 2 C 2 . Both populations were in Hardy-Weinberg equilibrium. Sex-related cytotype divergence was identified and multivariate analyses revealed that the C 2 C 2 individuals presented morphometric differentiation relative to body height in relation to the other cytotypes. A chromosome differentiation and a cytotype proportion difference observed between both populations suggest the occurrence of population subdivision within this species along the Upper Paraná River basin. These findings might contribute to the knowledge of the population biology of this fish and for its conservation.

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confidence: 61%

Chromosomal evidence of population subdivision in the freshwater fish Leporinus elongatus in the Upper Paraná River basin

2008

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“…(Received 28 August 7997 -Accepted 12 November 1997) CHROMOSOME DIVERSITY Neotropical fishes present a high chromosome diversity showing a wide diploid number variation range (see Oliveira et al, 1988, for a revision), including different levels of ploidies (i.e., Morelli et al, 1983b;Almeida-Toledo et al, 1985;Venere & Galetti, 1985;Oliveira et al, 1992), different types of sex chromosome systems (i.e., Galetti et al, 1981;Bertollo et al, 1983;Almeida-Toledo et al, 1984;Galetti & Foresti, 1986, 1987, chromosome supernumeraries (Foresti et al, 1989;Fenocchio & Bertollo, 1990;Maistro et al, 1992;Salvador & Moreira-Filho, 1992), and several cases of polymorphisms, specially related to heterochromatin and NOR sites (i.e., Galetti et al, 1984Galetti et al, , 1991a.…”

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confidence: 99%

“…Several cases of sexual chromosomes have already been described among neotropical fishes, from XY or ZW systems involving males or females (Galetti et al, 1981(Galetti et al, , 1995aGaletti & Foresti, 1986, 1987Moreira-Filho et al, 1993), respectively, to multiple systems such as XY X Y 2 or XjX 2 Y in males (Bertollo et al, 1983;Almeida-Toledo et al, 1984), and ZWjW 2 in females (Moreira- Filho et al, 1980). A good example of sex chromosomes occurs in the genus Leporinus, a characiform of the family Anostomidae.…”

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Chromosome diversity in neotropical fishes: NOR studies

Galetti¹

1998

Italian Journal of Zoology

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Neotropical fishes present a high chromosome diversity showing a wide diploid number variation range, including different levels of ploidies, sex chromosomes, chromosome supernumeraries, and several cases of polymorphisms, related particularly to heterochromatin and NOR sites. Two main general trends of chromosome diversification can be observed among neotropical fishes. First, several fish groups show a chromosome evolution relatively divergent from the point of view of the karyotypic macrostructure. Sister species show conspicuous differences in karyotype structure and most often also in the number of chromosomes. On the other hand, there are fish groups in which chromosome evolution has been shown to be less divergent, and in this case whole families or even groups of families may share a common karyotype structure and equal number of chromosomes. Several fish groups appear conservative also with respect to the NOR bearing chromosomes. In this case, NOR chromosome location is invariable among species. In contrast, several other groups present wide NOR variability. Sister species may show quite diverse chromosomes bearing nucleolar organizing regions. The NOR and heterochromatin relationship is also very diverse among fishes and this may indicate organizational differences involving these chromosome segments. Thus, neotropical fish fauna presents great chromosome variability, verifiable also by NOR studies.

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“…The diploid number of 54 comprises metacentric and submetacentric chromosomes, and the karyotypes of most species carry a single NOR bearing pair. [21][22][23][24] The genus Leporinus has been well studied and 25 of the 87 species in this genus have been karyotyped. The presence of a peculiar sex chromosome system with female heterogamety is restricted to a few species in this genus, i.e., L. elongatus, L. macrocephalus, L. obtusidens, L. reinhardtii, L. silvetrii, L. conirostris, and L. trifasciatus.…”

Section: Introductionmentioning

confidence: 99%

Chromosome mapping of retrotransposable elementsRex1andRex3inLeporinusSpix, 1829 species (Characiformes: Anostomidae) and its relationships among heterochromatic segments and W sex chromosome

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Silva

Parise-Maltempi

2013

Mobile Genetic Elements

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Heteromorphic sex chromosomes in three species of the genus <i>Leporinus </i>(Pisces, Anostomidae)

Cited by 64 publications

References 1 publication

Chromosomal evidence of population subdivision in the freshwater fish Leporinus elongatus in the Upper Paraná River basin

Chromosomal evidence of population subdivision in the freshwater fish Leporinus elongatus in the Upper Paraná River basin

Chromosome diversity in neotropical fishes: NOR studies

Chromosome mapping of retrotransposable elementsRex1andRex3inLeporinusSpix, 1829 species (Characiformes: Anostomidae) and its relationships among heterochromatic segments and W sex chromosome

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