The Balbiani Body, Developing Egg Envelopes, and Follicular Cells in the Previtellogenic Ovarian Follicles of the Eurasian Ruffe (Gymnocephalus cernua Linnaeus 1758) (Teleostei, Perciformes).

Authors

Monika Żelazowska, Roman Kujawa

Published in

Journal of morphology. Volume 287. Issue 6. Pages e70143.

Abstract

The ovarian follicles of Gymnocephalus cernua consist of a single oocyte surrounded by follicular cells (FCs), a basal lamina and thecal cells. To address the lack of knowledge regarding the early development of oocytes, the early, mid-, and late previtellogenic follicles were examined. The oocytes are polarized. In early previtellogenic oocytes the nuclei are eccentrically located and emit nuage to the cytoplasm (ooplasm), in close proximity to the follicular epithelium in the animal region. There, a micropylar cell responsible for the formation of the micropylar canal in the egg envelopes is determined. The mitochondria in the Balbiani body (Bb) form complexes with the perinuclear nuage on the opposite side of the nucleus, forming germline precursors (complexes of mitochondria and nuage-like material). In midprevitellogenic oocytes, the nucleus moves to a central position, continues to emit nuage, and the Bb forms a perinuclear ring. The mitochondria multiply and accumulate. Nuage, composed of threads appears and forms a spherical accumulation in close contact with the mitochondria. In late previtellogenic oocytes, the Bb enlarges and becomes fragmented. Fragments containing mitochondria, nuage, and complexes of mitochondria and nuage-like material, as well as Golgi complexes move to the ooplasm near the plasma membrane. The spherical accumulation of thread-like nuage is located at the vegetal pole. Various stages of autophagic degradation of mitochondria are present within autolysosomes (multilamellar bodies) in the Bb. These results support the hypothesis that the primary evolutionary role of the Bb is to select healthy mitochondria and transfer them to the next generation. The function of autolysosomes in the circulation and storage of membranes, and in the deposition of egg envelopes, is also discussed. Oocytes are covered by three primary egg envelopes, and their ultrastructure and deposition are described. Both the oocytes and the FCs are involved in this process.

PMID:
42324844
Bibliographic data and abstract were imported from PubMed on 22 Jun 2026.

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