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XB-ART-16416
Chromosoma June 1, 1997; 105 (7-8): 438-43.
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"Micronucleoli" in the Xenopus germinal vesicle.

Wu Z , Gall JG .


Abstract
The germinal vesicle of the Xenopus oocyte contains 1500 or more extrachromosomal nucleoli that are assembled on amplified copies of the rRNA genes. Many of these nucleoli have diameters of 10-15 micron, but some are much smaller, ranging down to 1 micron or less. Morphologically the smaller nucleoli or "micronucleoli" resemble the similarly sized B snurposomes, but they can be recognized with appropriate antibody probes (e.g., anti-nucleolin and anti-fibrillarin). We describe here a sensitive fluorescent staining technique that uses avidin and propidium iodide to visualize the rDNA in the amplified nucleoli. Many large nucleoli stain about as brightly as haploid yeast nuclei on the same slides. They presumably contain about 12 Mb of DNA, equivalent to 900 rDNA repeats. The smallest micronucleoli display only a tiny dot of stain, which must correspond to relatively few rDNA repeats.

PubMed ID: 9211971
Article link: Chromosoma
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: avd eif3a
Antibodies: Fbl Ab3

References [+] :
Birnstiel, Properties and composition of the isolated ribosomal DNA satellite of Xenopus laevis. 1968, Pubmed, Xenbase