Ribosomal gene amplification in the oocytes of Creophilus maxillosus (Staphylinidae, Coleoptera-Polyphaga) - An insect with telotrophic ovaries

M. Kloc, B. Matuszewski, J. Nurkowska

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

We have shown that the extrachromosomal DNA body present in the oocyte nucleus of Creophilus maxillosus contains amplified copies of ribosomal DNA and that multiple nucleoli associated with extrachromosomal DNA body contain ribosomal RNA. In addition, we assessed the level of rDNA amplification in Creophilus oocytes. The amount of DNA in single extra DNA body corresponds to 86% of total nuclear DNA content or 617% of chromosomal DNA content. In Creophilus, there are two phases of transcriptional activity of extrachromosomal rDNA, first in oogonia, and second in growing oocytes, separated by a short period of transcriptional quiescence in the ovary of newly hatched imago. We have described the organization and activity of extra DNA body in RNA synthesis and production of multiple nucleoli in previtellogenic stages of oocyte growth in imaginal ovariole of Creophilus.

Original languageEnglish (US)
Pages (from-to)267-276
Number of pages10
JournalFolia Histochemica et Cytobiologica
Volume33
Issue number4
StatePublished - 1995

Keywords

  • amplification
  • oogenesis
  • Staphylinidae
  • telotrophic ovary

ASJC Scopus subject areas

  • Anatomy
  • Cell Biology

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