In vivo effects of γ-irradiation on the functional architecture of the lampbrush chromosomes in Pleurodeles (Amphibia, Urodela)
Identifieur interne : 000526 ( France/Analysis ); précédent : 000525; suivant : 000527In vivo effects of γ-irradiation on the functional architecture of the lampbrush chromosomes in Pleurodeles (Amphibia, Urodela)
Auteurs : M. T. Loones [France]Source :
- Chromosoma [ 0009-5915 ] ; 1979-08-01.
Abstract
Abstract: In vivo irradiation of ovaries of Pleurodeles poireti by γ-rays leads to structural rearrangement of lampbrush chromosomes in late vitellogenic oocytes (stages V and VI). The loops collapse into the chromomeres and the axes condense. Doses between 200 and 2,000 rads have been tested. We observed that such changes were dependent on the irradiation dose though the chronological order of the events was irrespective of the dose. The maximum effect was attained about 10 h after irradiation. The alterations are totally reversible. Over a period of 3 days, chromosomes gradually relax, regenerate loops and recover their normal appearance. In mid vitellogenic oocytes (stages III and IV) lampbrush chromosomes do not undergo radiation induced alterations. It seems that only full-grown oocytes are competent to respond to the ionizing-flow.
Url:
DOI: 10.1007/BF00288697
Affiliations:
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ISTEX:492B4A554FEC3C699AE2B2A609838B9E49E499E0Le document en format XML
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