Data/hora: 03/06/2024 10:55:11

Provedor de dados: 	Genetics and Molecular Biology	
País: 	Brazil	
Título: 	Esterase-D and chromosome patterns in Central Amazon piranha (Serrasalmus rhombeus Linnaeus, 1766) from Lake Catalão	
Autores: 	Teixeira,Aylton Saturnino; Nakayama,Celeste Mutuko; Porto,Jorge Ivan Rebelo; Feldberg,Eliana.	
Data: 	2006-01-01	
Ano: 	2006	
Palavras-chave: 	Brazilian Amazon basin; Esterase enzymes; Serrasalmus rhombeus species complex; Karyotype.	
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.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000300018	
Editor: 	Sociedade Brasileira de Genética	
Relação: 	10.1590/S1415-47572006000300018	
Formato: 	text/html	
Fonte: 	Genetics and Molecular Biology  v.29 n.3 2006	
Fonte: 	info:eu-repo/semantics/openAccess