Transferrin polymorphism in Central Amazon populations of pescada, Plagioscion squamosissimus
Genet. mol. res. (Online)
;
1(3): 216-226, Sept. 2002. ilus, mapas, tab, graf
Article
Dans Anglais
| 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.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Polymorphisme génétique
/
Transferrine
/
Poissons
/
Fréquence d'allèle
Limites du sujet:
Animaux
Pays comme sujet:
Amérique du Sud
/
Brésil
langue:
Anglais
Texte intégral:
Genet. mol. res. (Online)
Thème du journal:
Biologie moléculaire
/
Génétique
Année:
2002
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
Instituto Nacional de Pesquisa da Amazônia/BR
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