New evidence for nucleolar dominance in hybrids of Drosophila arizonae and Drosophila mulleri
Genet. mol. res. (Online)
; 5(4): 632-637, 2006. ilus
Artigo
em Inglês
| LILACS
| ID: lil-482092
Biblioteca responsável:
BR1.1
ABSTRACT
Drosophila mulleri (MU) and D. arizonae (AR) are cryptic species of the mulleri complex, mulleri subgroup, repleta group. Earlier cytogenetic studies revealed that these species have different regulatory mechanisms of nucleolar organizing activity. In these species, nucleolar organizing regions are found in both the X chromosome and the microchromosome. In the salivary glands of hybrids between MU females and AR males, there is an interspecific dominance of the regulatory system of the D. arizonae nucleolar organizer involving, in males, amplification and activation of the nucleolar organizer from the microchromosome. The authors who reported these findings obtained hybrids only in that cross-direction. More recently, hybrids in the opposite direction, i.e., between MU males and AR females, have been obtained. The purpose of the present study was to evaluate, in these hybrids, the association of the nucleoli with the chromosomes inherited from parental species in order to cytogenetically confirm the dominance patterns previously described. Our results support the proposed dominance of the AR nucleolar organizer activity over that of MU, regardless of cross-direction.
Texto completo:
Disponível
Coleções:
Bases de dados internacionais
Base de dados:
LILACS
Assunto principal:
Cromossomo X
/
Nucléolo Celular
/
Drosophila
/
Hibridização Genética
/
Região Organizadora do Nucléolo
Limite:
Animais
Idioma:
Inglês
Revista:
Genet. mol. res. (Online)
Assunto da revista:
Biologia Molecular
/
Genética
Ano de publicação:
2006
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Universidade Estadual Paulista/BR