X1X2O (male) – X1X1X2X2(female) chromosomal sex determining mechanism in the cricket Cicloptyloides americanus (Orthoptera, Grylloidea, Mogoplistidae)

Mesa, Alejo; García-Novo, Paula

doi:10.1665/1082-6467(2002)011[0087:xxomxx]2.0.co;2

Cited by 6 publications

(12 citation statements)

References 4 publications

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“…The autosomes are metacentric, and X 1 is metacentric, while X 2 is acrocentric (Fig. 1a, b); differing from the previous description by Mesa et al (2002) (see "Discussion"). The C-banding and mapping of highly and moderately repetitive DNAs (C 0 t-1 DNA) showed a highly variable inter-chromosomal distribution with centromeric (pairs 1-3 and 6), interstitial (pair 4) and terminal (pair 3) blocks, Fig.…”

Section: Resultscontrasting

confidence: 55%

“…1a, b) as observed by Mesa et al (2002). The autosomes are metacentric, and X 1 is metacentric, while X 2 is acrocentric (Fig.…”

Section: Resultsmentioning

confidence: 52%

“…The meiotic chromosomes were obtained from testis and embryos were cytologically prepared as in with slight modifications for mitotic chromosome obtaining. For general chromosome analysis, we used conventional staining with 5 % Giemsa for some males and females to confirm the presence of the X 1 X 2 0♂/X 1 X 1 X 2 X 2 ♀ sex system as described by Mesa et al (2002). C-banding was performed according to Sumner (1972), and fluorochrome staining CMA 3 /DA/DAPI followed the protocol of Schweizer et al (1983).…”

Section: Methodsmentioning

confidence: 99%

“…M. Palacios-Gimenez · D. C. Cabral-de-Mello (*) Departamento de Biologia, Instituto de Biociências/IB, UNESP-Univ Estadual Paulista, Rio Claro, São Paulo CEP 13506-900, Brazil e-mail: mellodc@rc.unesp.br system have been observed, with the occurrence of some distinct derived sex-systems, in most cases neo-XY♂/XX♀ and neo-X 1 X 2 Y♂/X 1 X 1 X 2 X 2 ♀ and even X 1 X 2 0♂/X 1 X 1 X 2 X 2 ♀ in the cricket species Cycloptiloides americanus and Endecous ubajarensis (Mesa and de Mesa 1967;White 1969White , 1973Hewitt 1979;Mesa et al 1982Mesa et al , 2002Castillo et al 2010;Palacios-Gimenez et al 2013;Zefa et al 2014). The Robertsonian (Rb) and tandem fusions, dissociations and inversions involving autosomes and sex chromosomes seem to be major evolutionary causes in the emergence of neosex chromosomes in this group (White 1973;Hewitt 1979;Bidau and Martí 2001;Mesa et al 2002;Castillo et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Here, to understand repetitive DNA chromosomal organization and sex chromosome evolution in crickets, we studied the X 1 X 2 0♂/X 1 X 1 X 2 X 2 ♀ sex system of C. americanus, which is a rare case of this sex system that has been observed in Orthoptera (Mesa et al 2002), through classical cytogenetic techniques and fluorescence in situ hybridization (FISH) for some repetitive DNAs. Our data are discussed to shed light on repetitive DNA organization in crickets and the origin/evolution of the unusual X 1 X 2 0 sex chromosome system.…”

Section: Introductionmentioning

confidence: 99%

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Repetitive DNA chromosomal organization in the cricket Cycloptiloides americanus: a case of the unusual X1X20 sex chromosome system in Orthoptera

Palacios-Gimenez

Cabral-de-Mello

2014

Mol Genet Genomics

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A common placement for most sex chromosomes that is involved in their evolutionary histories is the accumulation of distinct classes of repetitive DNAs. Here, with the aim of understanding the poorly studied repetitive DNA organization in crickets and its possible role in sex chromosome differentiation, we characterized the chromosomes of the cricket species Cycloptiloides americanus, a species with the remarkable presence of the unusual sex chromosome system X1X20♂/X1X1X2X2♀. For these proposes, we used C-banding and mapping through the fluorescence in situ hybridization of some repetitive DNAs. The C-banding and distribution of highly and moderately repetitive DNAs (C 0t-1 DNA) varied depending of the chromosome. The greater accumulation of repetitive DNAs in the X2 chromosome was evidenced. The microsatellites were spread along entire chromosomes, but (AG)10 and (TAA)10 were less enriched, mainly in the centromeric areas. Among the multigene families, the 18S rDNA was spread throughout almost all of the chromosomes, except for pair 5 and X2, while the U2 snDNA was placed exclusively in the largest chromosome. Finally, the 5S rDNA was exclusively located in the short arms of the sex chromosomes. The obtained data reinforce the importance of chromosomal dissociation and inversion as a primary evolutionary mechanism to generate neo-sex chromosomes in the species studied, followed by the repetitive DNAs accumulation. Moreover the exclusive placement of 5S rDNA in the sex chromosomes suggests the involvement of this sequence in sex chromosome recognition throughout meiosis and, consequently, their maintenance, in addition to their avoiding degeneration.

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Section: Resultscontrasting

confidence: 55%

“…1a, b) as observed by Mesa et al (2002). The autosomes are metacentric, and X 1 is metacentric, while X 2 is acrocentric (Fig.…”

Section: Resultsmentioning

confidence: 52%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Repetitive DNA chromosomal organization in the cricket Cycloptiloides americanus: a case of the unusual X1X20 sex chromosome system in Orthoptera

Palacios-Gimenez

Cabral-de-Mello

2014

Mol Genet Genomics

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A new species of Endecous Saussure, 1878 (Orthoptera, Gryllidae) from northeast Brazil with the first X1X20 chromosomal sex system in Gryllidae

Zefa

Redü

Costa

et al. 2014

Zootaxa

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In this paper we describe a new species of Luzarinae cricket collected from the cave "Gruta de Ubajara, municipality of Ubajara, State of Ceará, Brazil, highlighting phallic sclerites morphology and chromosome complement as diagnostic characters. We presented meiotic and mitotic characterization in order to define the karyotype with 2n = 12 + X1X2♂/12 + X1X1X2X2♀. This represents the first record of X1X20 chromosomal sex system in Gryllidae.

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A novel multiple sex chromosome system in Orthoptera, found in the tree cricket Oecanthus rubromaculatus Zefa, 2022 (Grylloidea, Oecanthidae)

ZEFA,

ACOSTA,

KRETSCHMER

et al. 2024

Zootaxa

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The X0♂/XX♀ sex chromosome system prevails in most Orthopteran species. The X chromosome stands as one of the largest chromosomes within the complement, and is characterized by its heterochromatic nature. Variations of this model were found in some species of grasshoppers, crickets, and katydids, based on X/autosome rearrangements, giving rise to new sex chromosome systems, such as neo-XY♂/XX♀ and neo-X1X2Y♂/X1X1X2X2♀. The sex chromosome system neo-X1X20♂/X1X1X2X2♀ is rare in Orthoptera, and was observed only in two cricket species. In this study, we present the first multiple chiasmatic sex chromosome system in Orthoptera, found in the tree cricket Oecanthus rubromaculatus Zefa, 2022 from two distinct locations in the State of Rio Grande do Sul, Brazil. In one location, individuals exhibited a karyotype with 2n = 12, X1X2Y1Y2♂/X1X1X2X2♀, while in the other a karyotype of 2n = 12, X1X2X3Y1Y2Y3♂/X1X1X2X2X3X3♀ was observed. We proposed a model to explain the evolutionary steps in the formation of these karyotypes, based on chromosomal information of the Neotropical Oecanthus’ species. In this context, we proposed a hypothesis to explain the chromosome reorganization in O. rubromaculatus, starting from an ancestral karyotype of 2n = 21, X0♂, like the karyotype found in Oecanthus pictus Milach & Zefa, 2015, resulting in a significant reduction to 2n = 12 in O. rubromaculatus. This reorganization has led to the emergence of the novel multiple sex chromosome system in Orthoptera.

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X₁X₂O (male) – X₁X₁X₂X₂(female) chromosomal sex determining mechanism in the cricket Cicloptyloides americanus (Orthoptera, Grylloidea, Mogoplistidae)

Cited by 6 publications

References 4 publications

Repetitive DNA chromosomal organization in the cricket Cycloptiloides americanus: a case of the unusual X1X20 sex chromosome system in Orthoptera

Repetitive DNA chromosomal organization in the cricket Cycloptiloides americanus: a case of the unusual X1X20 sex chromosome system in Orthoptera

A new species of Endecous Saussure, 1878 (Orthoptera, Gryllidae) from northeast Brazil with the first X1X20 chromosomal sex system in Gryllidae

A novel multiple sex chromosome system in Orthoptera, found in the tree cricket Oecanthus rubromaculatus Zefa, 2022 (Grylloidea, Oecanthidae)

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