Primordial germ cells in normal and transected duck blastoderms

Development ◽  
1968 ◽  
Vol 20 (3) ◽  
pp. 247-260
Author(s):  
Teresa Rogulska
Keyword(s):  
Chick Embryo ◽  
Blood Vessels ◽  
Germ Cells ◽  
Anterior Part ◽  
Primordial Germ Cells ◽  
Primitive Streak ◽  
Experimental Investigations ◽  
Suggestive Evidence ◽  
Area Pellucida

Suggestive evidence for the extragonadal origin of germ cells in birds was first presented by Swift (1914), who described primordial germ cells in the chick embryo at as early a stage as the primitive streak. According to Swift, primordial germ cells are originally located extra-embryonically in the anterior part of the blastoderm and occupy a crescent-shaped region (‘germinal crescent’) on the boundary between area opaca and area pellucida. Swift also found that primordial germ cells later enter into the blood vessels, circulate together with the blood throughout the whole blastoderm and finally penetrate into the genital ridges, where they become definitive germ cells. Swift's views have been confirmed in numerous descriptive and experimental investigations. Among the latter, the publications of Willier (1937), Simon (1960) and Dubois (1964a, b, 1965a, b, 1966) merit special attention. Dubois finally proved that the genital ridges exert a strong chemotactic influence on the primordial germ cells.

Effects of HSP90 inhibition on primordial germ cells migration: A study in the gonad of the chick embryo

Morphologie ◽  
2020 ◽  
Vol 104 (347) ◽  
pp. 228-236
Author(s):  
M. Lejong ◽  
M. Choa-Duterre ◽  
N. Vanmuylder ◽  
S. Louryan
Keyword(s):  
Chick Embryo ◽  
Germ Cells ◽  
Primordial Germ Cells ◽  
Hsp90 Inhibition

Extragonadal distribution of primordial germ cells in the early chick embryo

1988 ◽  
Vol 222 (1) ◽  
pp. 90-94 ◽  
Author(s):  
Masao Nakamura ◽  
Takashi Kuwana ◽  
Yukihiko Miyayama ◽  
Toyoaki Fujimoto
Keyword(s):  
Chick Embryo ◽  
Germ Cells ◽  
Primordial Germ Cells ◽  
Early Chick Embryo

The positional effect of presumptive primordial germ cells (pPGCs) on their differentiation into PGCs in Xenopus

Development ◽  
1988 ◽  
Vol 102 (3) ◽  
pp. 527-535
Author(s):  
K. Ikenishi ◽  
Y. Tsuzaki
Keyword(s):  
Germ Cells ◽  
Germ Plasm ◽  
Germ Line ◽  
Anterior Part ◽  
Primordial Germ Cells ◽  
Positional Effect ◽  
In Series

To determine whether the location of ‘germ plasm’-bearing cells [presumptive primordial germ cells (pPGCs)] is crucial for their differentiation into PGCs in Xenopus, [3H]thymidine-labelled pPGCs were implanted into the anterior or posterior halves of the endoderm in unlabelled host neurulae. Labelled PGCs in the genital ridges of experimental tadpoles were investigated by autoradiography. When the labelled pPGCs were implanted into posterior halves of the endoderm where host pPGCs are situated, 65 and 77% of the experimental tadpoles (designated as p-tadpoles) had the labelled PGCs in series I and II, respectively. When implanted into the anterior halves, 20 and 27% of the experimental tadpoles (a- tadpoles) had the labelled PGCs in series I and II, respectively. In p-tadpoles, the average numbers of labelled PGCs per tadpole were 8á7 in series I and 10 in series II, whereas they were 2á0 in a-tadpoles of both series. Both the proportion and the average number in p-tadpoles of both series were significantly different from those in a-tadpoles. In both series, labelled PGCs in p-tadpoles were found to be distributed throughout the genital ridges while those in a-tadpoles were localized only in the anterior part of the ridges. These facts indicate that the location of pPGCs in the endoderm affects their successful migration into the genital ridges, and that not only the presence of the germ plasm but also the proper location in endoderm are prerequisites to PGC differentiation of the germ line cells.

The origin, migration and morphology of the primordial germ cells in the chick embryo

1976 ◽  
Vol 185 (2) ◽  
pp. 139-153 ◽  
Author(s):  
Toyoaki Fujimoto ◽  
Atsumi Ukeshima ◽  
Ranko Kiyofuji
Keyword(s):  
Chick Embryo ◽  
Germ Cells ◽  
Primordial Germ Cells

On the Origin of Primordial Germ Cells in the Chick Embryo

1976 ◽  
Vol 6 (1-3) ◽  
pp. 13-16 ◽  
Author(s):  
H. EYAL-GILADI ◽  
S. KOCHAV ◽  
M.K. MENASHI
Keyword(s):  
Chick Embryo ◽  
Germ Cells ◽  
Primordial Germ Cells

scholarly journals THE DEPENDENCE OF HEAD CURVATURE ON THE DEVELOPMENT OF THE HEART IN THE CHICK EMBRYO

1937 ◽  
Vol 14 (2) ◽  
pp. 229-231 ◽  
Author(s):  
C. H. WADDINGTON
Keyword(s):  
Chick Embryo ◽  
Blood Vessels ◽  
Brain Region ◽  
Normal Development ◽  
Anterior Part ◽  
Blood System ◽  
Chick Embryos ◽  
Aortic Arches ◽  
The Brain

1. The heart was removed from chick embryos of seven to twelve somites, and the embryos cultivated in vitro. The operation abolished the normal twisting of the anterior part of the embryo on to its left side and the general bending of the brain region into an arc. These two processes therefore seem to be dependent on the normal development of the heart. 2. The embryos showed a bending of the forebrain relative to the midbrain, which is therefore independent of the development of the heart. 3. The embryonic blood system, including the aortic arches, developed normally in many cases, but the blood vessels became enormously dilated. 4. The lateral evaginations of the foregut and the visceral arch mesenchyme underwent the first stages of differentiation in atypical positions, seemingly independently of each other or of any other structures.

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