Repetitive DNA and meiotic behavior of sex chromosomes in Gymnotus pantanal (Gymnotiformes, Gymnotidae)
Neotropical fishes have a low rate of chromosome differentiation between sexes. The present study characterizes the first meiotic analysis of sex chromosomes in the order Gymnotiformes. Gymnotus pantanal - females had 40 chromosomes (14m/sm, 26st/a) and males had 39 chromosomes (15m/sm, 24st/a), wit...
| Autor principal: | Silva, M. R. da |
|---|---|
| Outros Autores: | Matoso, D. A., Vicari, Marcelo Ricardo, Almeida, Mara Cristina de, Margarido, Vladimir Pavan, Artoni, Roberto Ferreira |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Cytogenetic and Genome Research
2020
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| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/18136 |
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oai:repositorio:1-18136 |
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dspace |
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oai:repositorio:1-18136 Repetitive DNA and meiotic behavior of sex chromosomes in Gymnotus pantanal (Gymnotiformes, Gymnotidae) Silva, M. R. da Matoso, D. A. Vicari, Marcelo Ricardo Almeida, Mara Cristina de Margarido, Vladimir Pavan Artoni, Roberto Ferreira Repetitive Dna Animals Tissue Chromosome Analysis Dna Determination Female Gymnotiformes Gymnotus Pantanal Heterochromatin Male Meiosis Metaphase Chromosome Nonhuman Priority Journal Sex Chromosome Animal Base Sequence Chromosome Banding Female Gymnotiformes In Situ Hybridization, Fluorescence Karyotype Karyotyping Male Meiosis Molecular Sequence Data Pachytene Stage Repetitive Sequences, Nucleic Acid Sequence Analysis, Dna Sex Chromosomes Gymnotidae Gymnotiformes Gymnotus Pisces Neotropical fishes have a low rate of chromosome differentiation between sexes. The present study characterizes the first meiotic analysis of sex chromosomes in the order Gymnotiformes. Gymnotus pantanal - females had 40 chromosomes (14m/sm, 26st/a) and males had 39 chromosomes (15m/sm, 24st/a), with a fundamental number of 54 - showed a multiple sexual determination chromosome system of the type X 1X 1X 2X 2/X 1X 2Y. The heterochromatin is restricted to centromeres of all chromosomes of the karyotype. The meiotic behavior of sex chromosomes involved in this system in males is from a trivalent totally pared in the pachytene stage, with a high degree of similarity. The cells of metaphase II exhibit 19 and 20 chromosomes, normal disjunction of sex chromosomes and the formation of balanced gametes with 18 + Y and 18 + X 1X 2 chromosomes, respectively. The small amount of heterochromatin and repetitive DNA involved in this system and the high degree of chromosome similarity indicated a recent origin of the X 1X 1X 2X 2/X 1X 2Y system in G. pantanal and suggests the existence of a simple ancestral system with morphologically undifferentiated chromosomes. Copyright © 2011 S. Karger AG. 2020-06-15T21:51:57Z 2020-06-15T21:51:57Z 2011 Artigo https://repositorio.inpa.gov.br/handle/1/18136 10.1159/000330777 en Volume 135, Número 2, Pags. 143-149 Restrito Cytogenetic and Genome Research |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Repetitive Dna Animals Tissue Chromosome Analysis Dna Determination Female Gymnotiformes Gymnotus Pantanal Heterochromatin Male Meiosis Metaphase Chromosome Nonhuman Priority Journal Sex Chromosome Animal Base Sequence Chromosome Banding Female Gymnotiformes In Situ Hybridization, Fluorescence Karyotype Karyotyping Male Meiosis Molecular Sequence Data Pachytene Stage Repetitive Sequences, Nucleic Acid Sequence Analysis, Dna Sex Chromosomes Gymnotidae Gymnotiformes Gymnotus Pisces |
| spellingShingle |
Repetitive Dna Animals Tissue Chromosome Analysis Dna Determination Female Gymnotiformes Gymnotus Pantanal Heterochromatin Male Meiosis Metaphase Chromosome Nonhuman Priority Journal Sex Chromosome Animal Base Sequence Chromosome Banding Female Gymnotiformes In Situ Hybridization, Fluorescence Karyotype Karyotyping Male Meiosis Molecular Sequence Data Pachytene Stage Repetitive Sequences, Nucleic Acid Sequence Analysis, Dna Sex Chromosomes Gymnotidae Gymnotiformes Gymnotus Pisces Silva, M. R. da Repetitive DNA and meiotic behavior of sex chromosomes in Gymnotus pantanal (Gymnotiformes, Gymnotidae) |
| topic_facet |
Repetitive Dna Animals Tissue Chromosome Analysis Dna Determination Female Gymnotiformes Gymnotus Pantanal Heterochromatin Male Meiosis Metaphase Chromosome Nonhuman Priority Journal Sex Chromosome Animal Base Sequence Chromosome Banding Female Gymnotiformes In Situ Hybridization, Fluorescence Karyotype Karyotyping Male Meiosis Molecular Sequence Data Pachytene Stage Repetitive Sequences, Nucleic Acid Sequence Analysis, Dna Sex Chromosomes Gymnotidae Gymnotiformes Gymnotus Pisces |
| description |
Neotropical fishes have a low rate of chromosome differentiation between sexes. The present study characterizes the first meiotic analysis of sex chromosomes in the order Gymnotiformes. Gymnotus pantanal - females had 40 chromosomes (14m/sm, 26st/a) and males had 39 chromosomes (15m/sm, 24st/a), with a fundamental number of 54 - showed a multiple sexual determination chromosome system of the type X 1X 1X 2X 2/X 1X 2Y. The heterochromatin is restricted to centromeres of all chromosomes of the karyotype. The meiotic behavior of sex chromosomes involved in this system in males is from a trivalent totally pared in the pachytene stage, with a high degree of similarity. The cells of metaphase II exhibit 19 and 20 chromosomes, normal disjunction of sex chromosomes and the formation of balanced gametes with 18 + Y and 18 + X 1X 2 chromosomes, respectively. The small amount of heterochromatin and repetitive DNA involved in this system and the high degree of chromosome similarity indicated a recent origin of the X 1X 1X 2X 2/X 1X 2Y system in G. pantanal and suggests the existence of a simple ancestral system with morphologically undifferentiated chromosomes. Copyright © 2011 S. Karger AG. |
| format |
Artigo |
| author |
Silva, M. R. da |
| author2 |
Matoso, D. A. Vicari, Marcelo Ricardo Almeida, Mara Cristina de Margarido, Vladimir Pavan Artoni, Roberto Ferreira |
| author2Str |
Matoso, D. A. Vicari, Marcelo Ricardo Almeida, Mara Cristina de Margarido, Vladimir Pavan Artoni, Roberto Ferreira |
| title |
Repetitive DNA and meiotic behavior of sex chromosomes in Gymnotus pantanal (Gymnotiformes, Gymnotidae) |
| title_short |
Repetitive DNA and meiotic behavior of sex chromosomes in Gymnotus pantanal (Gymnotiformes, Gymnotidae) |
| title_full |
Repetitive DNA and meiotic behavior of sex chromosomes in Gymnotus pantanal (Gymnotiformes, Gymnotidae) |
| title_fullStr |
Repetitive DNA and meiotic behavior of sex chromosomes in Gymnotus pantanal (Gymnotiformes, Gymnotidae) |
| title_full_unstemmed |
Repetitive DNA and meiotic behavior of sex chromosomes in Gymnotus pantanal (Gymnotiformes, Gymnotidae) |
| title_sort |
repetitive dna and meiotic behavior of sex chromosomes in gymnotus pantanal (gymnotiformes, gymnotidae) |
| publisher |
Cytogenetic and Genome Research |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/18136 |
| _version_ |
1787144136970731520 |
| score |
11.653393 |