Eurythermal fish acclimatization and nucleolar function: a review

The most dramatic adaptive responses of the carp fish to the seasonal environmental changes (mostly temperature and photoperiod) is the segregation of the nucleolar components during winter, concomitantly with a remarkable decay of rRNA synthesis and processing of their precursors. In contrast, summ...

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Bibliographic Details
Published in:Journal of thermal biology 2004-10, Vol.29 (7), p.663-667
Main Authors: Álvarez, Marco, Molina, Alfredo, Quezada, Claudia, Pinto, Rodrigo, Krauskopf, Manuel, Vera, María Inés
Format: Article
Language:English
Subjects:
Acclimatization
Adaptation
Carp rDNA
Freshwater
Nucleolar gene expression
Nucleolus
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Summary:The most dramatic adaptive responses of the carp fish to the seasonal environmental changes (mostly temperature and photoperiod) is the segregation of the nucleolar components during winter, concomitantly with a remarkable decay of rRNA synthesis and processing of their precursors. In contrast, summer-adapted fish depicts a nucleolar structure indicating an active state of ribosome biogenesis. The mRNA expression of ribosomal protein L41 and CK2 β, as well as the CK2 β protein is higher in summer. On the contrary, nucleolin mRNA expression is strongly induced in the cold- adapted carp, as it is the cognate nuclear protein content. The physiological up-regulation of nucleolin in the cold-acclimatized carp where rRNA transcription and processing are depressed is consistent with the rearrangement of the nucleolar components. Our observations indicate that rRNA transcription and nucleolar organelle dynamics are not constitutive. Both processes are strongly regulated by the environmental temperature of the habitat.
ISSN:0306-4565
1879-0992
DOI:10.1016/j.jtherbio.2004.08.036