Evidence of an XX/XY sex chromosome system in the fish Dormitator maculatus (Teleostei, Eleotrididae)

Oliveira, Cláudio; Toledo, Lurdes Foresti de Almeida

doi:10.1590/s1415-47572006000400013

Cited by 11 publications

(8 citation statements)

References 18 publications

(14 reference statements)

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“…These chromosomal rearrangements are associated with a reduction/loss of the 5S rDNA sequences in males (see below). Similar XX/XY sex chromosomes were reported in D. maculatus from Brazil [ 29 ], and this makes it possible to infer their origin. Indeed, as Pacific and Atlantic Dormitator geminate lineages diverged about 1 million years ago following geological and oceanographic changes associated with the formation of the Central American Isthmus [ 13 ], the differentiation of these sex chromosomes has an ancient origin and should have occurred before the splitting of the genus between the two ocean basins.…”

Section: Discussionsupporting

confidence: 80%

“…To date, cytogenetic data on Eleotridae scantly describe the diploid number for 11 species ( Table 1 ), barely representing 6.4% of the species ascribed to the family. The karyotype of D. latifrons was already described [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ], but the information provided is limited to the diploid number and the karyotype composition. Data from C-bands and active nucleolus organizer regions (Ag-NORs) are limited to other two species of the family, D. maculatus and Eleotris pisoni [ 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

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Sex Chromosomes and Internal Telomeric Sequences in Dormitator latifrons (Richardson 1844) (Eleotridae: Eleotrinae): An Insight into Their Origin in the Genus

Paim

Nirchio

Oliveira

et al. 2020

Genes

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The freshwater fish species Dormitator latifrons, commonly named the Pacific fat sleeper, is an important food resource in CentralSouth America, yet almost no genetic information on it is available. A cytogenetic analysis of this species was undertaken by standard and molecular techniques (chromosomal mapping of 18S rDNA, 5S rDNA, and telomeric repeats), aiming to describe the karyotype features, verify the presence of sex chromosomes described in congeneric species, and make inferences on chromosome evolution in the genus. The karyotype (2n = 46) is mainly composed of metacentric and submetacentic chromosomes, with nucleolar organizer regions (NORs) localized on the short arms of submetacentric pair 10. The presence of XX/XY sex chromosomes was observed, with the X chromosome carrying the 5S rDNA sequences. These heterochromosomes likely appeared before 1 million years ago, since they are shared with another derived Dormitator species (Dormitator maculatus) distributed in the Western Atlantic. Telomeric repeats hybridize to the terminal portions of almost all chromosomes; additional interstitial sites are present in the centromeric region, suggesting pericentromeric inversions as the main rearrangement mechanisms that has driven karyotypic evolution in the genus. The data provided here contribute to improving the cytogenetics knowledge of D. latifrons, offering basic information that could be useful in aquaculture farming of this neotropical fish.

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Section: Discussionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Sex Chromosomes and Internal Telomeric Sequences in Dormitator latifrons (Richardson 1844) (Eleotridae: Eleotrinae): An Insight into Their Origin in the Genus

Paim

Nirchio

Oliveira

et al. 2020

Genes

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“…Although the origin of sex chromosomes is presently not resolved, several hypotheses are being tested. Whereas some species have sex chromosomes that differ only in terms of centromere position, for example Dormitator maculatus (Oliveira and Almeida-Toledo 2006), many Neotropical species have large heterochromatic blocks related to sex chromosomes. Thus, several species have a ZZ/ZW system in which the W chromosome has a large heterochromatic block, as in the species of the genera Leporinus (Galetti et al 1981;Galetti and Foresti 1986) and Triportheus (Bertollo and Cavallaro 1992), Semaprochilodus taeniurus (Feldberg et al 1987), and Microlepidogaster leucofrenatus (Andreata et al 1993).…”

Section: Sex Chromosomesmentioning

confidence: 99%

Genetics of neotropical fish: from chromosomes to populations

Oliveira

Foresti

Hilsdorf

2008

Fish Physiol Biochem

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The Neotropical freshwater fish fauna is very rich--according to the most recent catalogue 71 families and 4,475 species have been described. However, only a small amount of general information is available on the composition of Neotropical marine fishes. In Brazil, 1,298 marine species have been recorded. General analysis of available cytogenetic and population genetic data clearly indicates research has been mainly concentrated on freshwater fishes. Thus, today, cytogenetic information is available for 475 species of Characiformes, 318 species of Siluriformes, 48 species of Gymnotiformes, 199 freshwater species that do not belong to the superorder Ostariophysi, and only 109 species of marine fishes. For the species studied, only about 6% have sex chromosomes and about 5% have supernumerary or B chromosomes. A review of the cytogenetic studies shows that these data have provided valuable information about the relationships between fish groups, the occurrence of cryptic species and species complexes, the mechanism of sex determination and sex chromosome evolution, the distribution of nucleolus organizer regions, the existence supernumerary chromosomes, and the relationship between polyploidy and evolution. In relation to populations in Neotropical marine waters, the studies have shown the presence of cryptic species, which has important implications for fishery management. Different levels of genetic structuring can be found among Neotropical freshwater migratory fish species. This raises important implications for fish population genetic diversity and consequently its sustainable utilization in inland fisheries and aquaculture, specifically for conservation of ichthyo-diversity and survival.

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“…Representatives of the suborder Blennioidei (e.g., Carbone et al 1987 ) and Gobioidei (e.g., Arai and Sawada 1974 , 1975; Thodeet al 1988; Oliveira and Almeida-Toledo 2006 ) stand out for their greater karyotype variability and diversity. This includes species with conserved karyotyes and those that are highly diversified.…”

Section: Discussionmentioning

confidence: 99%

Chromosomal complements of some Atlantic Blennioidei and Gobioidei species (Perciformes)

Galvão

Bertollo²,

Molina³

2011

CCG

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A remarkable degree of chromosomal conservatism (2n=48, FN=48) has been identified in several families of Perciformes. However, some families exhibit greater karyotypic diversity, although there is still scant information on the Atlantic species. In addition to a review of karyotypic data available for representatives of the suborders Blennioidei and Gobioidei, we have performed chromosomal analyses on Atlantic species of the families Blenniidae, Ophioblennius trinitatis Miranda-Ribeiro, 1919 (2n=46; FN=64) and Scartella cristata (Linnaeus, 1758)(2n=48; FN=50), Labrisomidae, Labrisomus nuchipinnis (Quoy & Gaimard, 1824)(2n=48; FN=50) and Gobiidae, Bathygobius soporator (Valenciennes, 1837)(2n=48; FN=56). Besides variations in chromosome number and karyotype formulas, Ag-NOR sites, albeit unique, were located in different positions and/or chromosome pairs for the species analyzed. On the other hand, the heterochromatic pattern was more conservative, distributed predominantly in the centromeric/pericentromeric regions of the four species. Data already available for Gobiidae, Blenniidae and Labrisomidae show greater intra- and interspecific karyotypic diversification when compared to other groups of Perciformes, where higher uniformity is found for various chromosome characteristics. Evolutionary dynamism displayed by these two families is likely associated with population fractionation resulting from unique biological characteristics, such as lower mobility and/or specific environmental requirements.

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Evidence of an XX/XY sex chromosome system in the fish Dormitator maculatus (Teleostei, Eleotrididae)

Cited by 11 publications

References 18 publications

Sex Chromosomes and Internal Telomeric Sequences in Dormitator latifrons (Richardson 1844) (Eleotridae: Eleotrinae): An Insight into Their Origin in the Genus

Sex Chromosomes and Internal Telomeric Sequences in Dormitator latifrons (Richardson 1844) (Eleotridae: Eleotrinae): An Insight into Their Origin in the Genus

Genetics of neotropical fish: from chromosomes to populations

Chromosomal complements of some Atlantic Blennioidei and Gobioidei species (Perciformes)

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