Related Experiment Video
Updated: Jun 21, 2026
Analysis of Neural Crest Migration and Differentiation by Cross-species Transplantation
Published on: February 7, 2012
Migratory ability of chick primordial germ cells transferred into quail embryos
Susumu Ishiguro1, Takeo Minematsu, Mitsuru Naito
1Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan.
Insights
Chick primordial germ cells (PGCs) migrate into quail embryos, with about 70% detected after one day. Their distribution between gonadal and extragonadal regions is consistent, regardless of the number of PGCs transferred.
Area of Science:
- Developmental Biology
- Cell Biology
- Comparative Embryology
Background:
- Primordial germ cells (PGCs) are essential for reproduction.
- Understanding PGC migration is crucial for developmental biology and reproductive research.
- Chick PGCs are a model system for studying germ cell development.
Purpose of the Study:
- To investigate the migratory ability and distribution of chick PGCs following transfer into quail embryos.
- To determine if the number of transferred PGCs influences their migration patterns.
- To assess the colonization of gonadal and extragonadal tissues by exogenous PGCs.
Main Methods:
- Chick PGCs (1-100 cells) were microinjected into the dorsal aorta of 2.5-day-old quail embryos.
- Embryos were analyzed one day post-transfer.
- Serial sections were prepared and stained (PAS and hematoxylin) to identify and quantify chick PGCs.
- PGCs were counted in the germinal epithelium, gonadal, head, and trunk areas.
Main Results:
- Approximately 70% of transferred chick PGCs were detected in quail embryos 24 hours after injection.
- About 60% of detected PGCs localized to the gonadal region, while 10% were found in extragonadal locations.
- This ~6:1 ratio of gonadal to extragonadal PGCs remained consistent irrespective of the initial number of PGCs transferred.
- The distribution pattern was independent of the cell dosage (1 to 100 PGCs).
Conclusions:
- Chick PGCs exhibit significant migratory capacity into quail embryos.
- PGC migration and subsequent distribution into gonadal and extragonadal sites occur probabilistically.
- The number of PGCs introduced does not alter the fundamental migration and localization probabilities within the quail embryonic environment.
- This study provides insights into the conserved mechanisms of germ cell migration across avian species.
Abstract:
The migratory ability of chick primordial germ cells (PGCs) transferred into quail embryos was investigated. One, ten, twenty, fifty or one hundred chick PGCs were transferred into the dorsal aorta of 2.5-day-old quail embryos. One day later, the embryos were isolated, and serial sections were prepared after embedding in paraffin. The sections were then double-stained with periodic acid-Schiff (PAS) and hematoxylin, and the numbers of PAS-positive chick PGCs in the germinal epithelium, gonadal area, head area and trunk area of the embryos were determined. Approximately 70% of the PGCs were detected in the embryos 1 day after transfer, with roughly 60% in the gonadal region and 10% in the extragonadal region. This ratio was consistent regardless of the number of PGCs transferred into the embryos. These data suggest that migration of chick PGCs into the gonadal and extragonadal regions of the quail embryo occurs probabilistically regardless of the number of chick PGCs transferred into quail embryos.
