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Computational Analysis of the Caenorhabditis elegans Germline to Study the Distribution of Nuclei, Proteins, and the Cytoskeleton

Computational Analysis of the Caenorhabditis elegans Germline to Study the Distribution of Nuclei, Proteins, and the Cytoskeleton

Published on: April 19, 2018

A model for germ cell development in a fully segmented worm.

Mercedes Maceren-Pates¹, Yoshihisa Kurita², Gaudioso Pates¹

¹Fishery Research Laboratory, Kyushu University, 4-46-24 Tsuyazaki, Fukutsu, 811-3304 Japan.

Zoological Letters

|December 10, 2015

Summary

This summary is machine-generated.

Germ cells in the marine worm Perinereis nuntia originate in the pygidium and migrate to new segments. This explains how polychaetes with complete septa develop gametes throughout their bodies.

Keywords:

Gonad Parapodium Perinereis nuntia Primordial germ cell Septum Vasa

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Area of Science:

Marine Biology
Developmental Biology
Annelid Research

Background:

Polychaetes are segmented marine worms with varying septum structures.
While some polychaetes develop gonads in the neck, germ cell development in Perinereis nuntia (Pe. nuntia) with complete septa is unknown.
The marker gene vasa is crucial for tracing germ cell development.

Purpose of the Study:

To investigate the developmental mechanism of germ cells in Perinereis nuntia.
To clarify how gametes are produced in each body segment of Pe. nuntia, despite complete septal separation.

Main Methods:

Utilized the marker gene vasa to track germ cell development.
Examined germ cell distribution throughout various life stages of Pe. nuntia, from juveniles to adults.
Observed Pn-vasa expression patterns in relation to segment addition and parapodia.

Main Results:

Pn-vasa positive cells were found in the pygidium and parapodia of juveniles.
During segment addition, Pn-vasa positive cells increased in the pygidium and appeared in new segments.
In adults, Pn-vasa expression was observed in parapodial clusters and oocytes within the coelomic cavity, suggesting translocation.

Conclusions:

Germ cells in Pe. nuntia are supplied from the pygidium to newly forming segments.
These cells subsequently settle in the parapodia and may translocate to the coelomic cavity for oocyte development.
This mechanism explains gamete generation across all body segments in Pe. nuntia, even with complete septa.