ELECTRON-MICROSCOPE STUDY OF LAMPBRUSH CHROMOSOMES AND THEIR ACTIVITY PRODUCTS DURING RABBITS OOGENESIS

  • 1 January 1975
    • journal article
    • research article
    • Vol. 17  (8) , 875-+
Abstract
An ultrastructural study of the rabbit oocyte nucleus was started from the early diplotene and extended to the rapid growth period to include the bilaminar follicle stage. During rapid growth, the rabbit oocytes do not develop to the dictyate or resting stage, but remain at the diplotene. At the period preceeding rapid growth (the early diplotene), lampbrush chromosomes possess a central axis 50 nm in diameter with lateral fibrils. The aggregation of long, loosely arranged fibrils forms the chromosome matrix. In the fibrillar zone of the chromosome, numerous roundish granules about 45 nm in diameter and dense granule accumulations about 0.15 .mu.m in diameter were visualized. Large fibrogranular bodies (1-2 .mu.m in diameter) are seen in association with the chromosomes. All these extra-nuclear bodies on the chromosomes differ in size and pattern. These are probably the nucleoli and may be considered a morphological expression of the genic activity of lampbrush chromosomes.

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