Transferrin polymorphism in Central Amazon populations of pescada, Plagioscion squamosissimus
Genet. mol. res. (Online)
;
1(3): 216-226, Sept. 2002. ilus, mapas, tab, graf
Artigo
em Inglês
| LILACS
| ID: lil-357423
ABSTRACT
Blood plasma of 253 specimens from eight population samples of the sciaenid fish, pescada (Plagioscion squamosissimus), caught from four sites in the Central Amazon, was tested for molecular variants of transferrin. Starch gel electrophoresis was used to distinguish six species of transferrin molecules; 12 of the 21 theoretically possible genotypes were found. There were highly significant departures from genetic equilibrium in seven of the eight population samples (chi-square (c2) test for Hardy-Weinberg expectations) due to an excess of homozygotes and a corresponding deficiency of heterozygotes. A dendrogram based on UPGMA cluster analysis of genetic distances at the transferrin gene locus, estimated among the population samples and statistical analyses of the distribution of Tf allele frequencies, indicated three genetically discreet sub-populations of P. squamosissimus. The three sub- populations, ôCareiro/Irandubaö, ôCoariö and ôTefeö, were found to have high frequencies of alleles Tf 2, Tf 4 and Tf 3, respectively. This genetic instability may be attributed to genetically discreet ôallopatric stockletsö, which diverged during past isolation.
Texto completo:
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Índice:
LILACS (Américas)
Assunto principal:
Polimorfismo Genético
/
Transferrina
/
Peixes
/
Frequência do Gene
Limite:
Animais
País/Região como assunto:
América do Sul
/
Brasil
Idioma:
Inglês
Revista:
Genet. mol. res. (Online)
Assunto da revista:
Biologia Molecular
/
Genética
Ano de publicação:
2002
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Instituto Nacional de Pesquisa da Amazônia/BR
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