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Plasmodesmata

Plasmodesmata

The organs in a multicellular organism’s body are made up of tissues formed by cells. To work together cohesively, cells must communicate. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.

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Updated: Feb 25, 2026

Nuclear Migration in the Drosophila Oocyte

Nuclear Migration in the Drosophila Oocyte

Published on: May 13, 2021

The Pole (Germ) Plasm in Insect Oocytes.

Szczepan M Bilinski¹, Mariusz K Jaglarz², Waclaw Tworzydlo²

¹Department of Developmental Biology and Morphology of Invertebrates, Institute of Zoology and Biomedical Research, Jagiellonian University, Gronostajowa 9, 30-387, Krakow, Poland. szczepan.bilinski@uj.edu.pl.

Results and Problems in Cell Differentiation

|August 6, 2017

Summary

Animal germline specification evolved from zygotic induction to cytoplasmic inheritance in insects. Cytoplasmic inheritance relies on maternally provided germline determinants in the germ plasm.

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Last Updated: Feb 25, 2026

Nuclear Migration in the Drosophila Oocyte

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Published on: May 13, 2021

Human Egg Maturity Assessment and Its Clinical Application

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Published on: August 19, 2019

Mouse Oocyte Microinjection, Maturation and Ploidy Assessment

Mouse Oocyte Microinjection, Maturation and Ploidy Assessment

Published on: July 23, 2011

Area of Science:

Developmental Biology
Evolutionary Biology
Genetics

Background:

Animal germline cells are specified via zygotic induction or cytoplasmic inheritance.
Cytoplasmic inheritance involves germ plasm with maternally supplied determinants.
Zygotic induction requires cell signaling for de novo germline fate acquisition.

Purpose of the Study:

To describe pole plasm and polar granule morphogenesis in Drosophila melanogaster.
To review pole plasm morphology in holometabolan and paraneopteran insects.
To explore phylogenetic hypotheses for insect germline specification strategies.

Main Methods:

Morphological and cytoarchitectural analysis of germline determinants.
Comparative study across diverse insect species.
Phylogenetic analysis to infer evolutionary history.

Main Results:

Detailed description of pole plasm and polar granule development in Drosophila.
Comparative overview of pole plasm structures in various insect taxa.
Evidence supporting the evolution of cytoplasmic inheritance in Holometabola/Paraneoptera.

Conclusions:

Zygotic induction is ancestral in insects; cytoplasmic inheritance evolved later.
Pole plasm structure and function are conserved yet diverse across insects.
Phylogenetic analysis clarifies the evolutionary trajectory of germline specification strategies.