[Variability of pericentromeric chromatin in chromosome 2 of ovarian nurse cells during inbreeding in Anopheles atroparvus V.Tiel]. / Izmenchivost' pritsentromernogo geterokhromatina khromosomy 2 pitaiushchikh kletok iaichnikov pri inbridinge u Anopheles atroparvus V. Tiel.
Genetika
; 34(7): 992-5, 1998 Jul.
Article
em Ru
| MEDLINE
| ID: mdl-9749341
ABSTRACT
We investigated the variability of pericentromeric chromatin of chromosome 2 in ovarian nurse cells (trophocytes) in two laboratory lines of malaria mosquito Anopheles atroparvus V. Tiel and in their hybrids. One line had been raised by means of sib inbreeding, the other kept at constantly high population density. The inbreeding was shown to result in an increased percentage of chromosomes bearing an achromatinic zone in the centromeric region, which resulted in chromosome breakage. Toxicological tests demonstrated an increase in the sensitivity of the progeny of females with abnormal morphotypes of chromosome 2 to the entomopathogenic bacterium Bacillus thuringiensis israelensis. The appearance of the achromatinic zone is attributed to local chromatin underreplication accompanying chromosome polytenization. Possible reasons for this phenomenon and its implication for adaptation are discussed.
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Base de dados:
MEDLINE
Assunto principal:
Ovário
/
Variação Genética
/
Heterocromatina
/
Centrômero
/
Cromossomos
/
Anopheles
Limite:
Animals
Idioma:
Ru
Ano de publicação:
1998
Tipo de documento:
Article