| Registro completo |
| Provedor de dados: |
Genet. Mol. Biol.
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| País: |
Brazil
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| Título: |
Esterase-D and chromosome patterns in Central Amazon piranha (Serrasalmus rhombeus Linnaeus, 1766) from Lake Catalão
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| Autores: |
Teixeira,Aylton Saturnino
Nakayama,Celeste Mutuko
Porto,Jorge Ivan Rebelo
Feldberg,Eliana
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| Data: |
2006-01-01
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| Ano: |
2006
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| Palavras-chave: |
Brazilian Amazon basin
Esterase enzymes
Serrasalmus rhombeus species complex
Karyotype
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| Resumo: |
This study presents additional genetic data on piranha (Serrasalmus rhombeus Linnaeus, 1766) complex previously diagnosed due to the presence of distinct cytotypes 2n = 58 and 2n = 60. Three esterase-D enzyme loci (Est-D1, Est-D2 and Est-D3) were examined and complemented with chromosomal data from 66 piranha specimens collected from Lake Catalão. For all specimens the Est-D1 and Est-D2 loci were monomorphic. In contrast, the Est-D3 locus was polymorphic with genotypes and alleles being differentially distributed in the previously described cytotypes and served as the basis for detecting a new cytotype (2n = 60 B). In cytotype 2n = 58 the Est-D3 locus was also polymorphic and presented Mendelian allelic segregation with four genotypes (Est-D3(11), Est-D3(12), Est-D3(22) and Est-D3(33)) out of six theoretically possible genotypes, presumably encoded by alleles Est-D3¹ (frequency = 0.237), EsT-D3² (0.710) and Est-D3³ (0.053). A Chi-squared (chi2) test for Hardy-Weinberg equilibrium was applied to the Est-D3 locus and revealed a genetic unbalance in cytotype 2n = 58, indicating the probable existence in the surveyed area of different stocks for that karyotypic structure. A silent null allele (Est-D3(0)) with a high frequency (0.959) occurred exclusively in the 2n = 60 cytotype. On the other hand, the new cytotype 2n = 60 B described here for the first time was monomorphic for the presumably fixed Est-D3³ allele. The data as a whole should contribute to the better understanding the rhombeus complex taxonomic status definition in the Central Amazon.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000300018
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| Editor: |
Sociedade Brasileira de Genética
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| Relação: |
10.1590/S1415-47572006000300018
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| Formato: |
text/html
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| Fonte: |
Genetics and Molecular Biology v.29 n.3 2006
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| Direitos: |
info:eu-repo/semantics/openAccess
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