Copepod development rates in relation to genome size and 18S rDNA copy number.
Genome
; 43(5): 750-5, 2000 Oct.
Article
en En
| MEDLINE
| ID: mdl-11081963
It is known that body sizes and temperature-independent developmental durations within two genera of calanoid Copepoda (Crustacea) are positively related to nuclear DNA contents of their somatic nuclei. Evidently because of the constraint of similar cell numbers among the species, (nucleotypic) effects of nucleus size on cell size and on cell-level processes are expressed at the whole-organism level. Here, we show that developmental durations of eight species of five genera are also negatively related to their greatly differing numbers of 18S rRNA genes per unit DNA. We propose that levels of rDNA iteration among copepods have been controlled by natural selection to regulate ribosome concentrations, therefore protein production and development rates, independently of the large variations in genome sizes, which are in turn adapted to regulating cell and therefore body sizes.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
ADN Ribosómico
/
Genoma
/
Crustáceos
Tipo de estudio:
Diagnostic_studies
Límite:
Animals
Idioma:
En
Revista:
Genome
Asunto de la revista:
GENETICA
Año:
2000
Tipo del documento:
Article
País de afiliación:
Canadá
Pais de publicación:
Canadá