Egg formation and the early embryonic development of Aspidogaster limacoides Diesing, 1835 (Aspidogastrea: Aspidogastridae), with comments on their phylogenetic significance

2011 ◽  
Vol 60 (4) ◽  
pp. 371-380 ◽  
Author(s):  
Zdzisław Świderski ◽  
Larisa G. Poddubnaya ◽  
David I. Gibson ◽  
Céline Levron ◽  
Daniel Młocicki
Keyword(s):  
Embryonic Development ◽  
Early Embryonic Development ◽  
Phylogenetic Significance ◽  
Egg Formation ◽  
Aspidogaster Limacoides

The Early Embryonic-Development of the Mnesarchaeid Moth, Mnesarchaea-Fusilella Walker (Lepidoptera, Mnesarchaeidae), and Its Phylogenetic Significance

1995 ◽  
Vol 43 (5) ◽  
pp. 479 ◽  
Author(s):  
Y Kobayashi ◽  
GW Gibbs
Keyword(s):  
Embryonic Development ◽  
Early Embryonic Development ◽  
Vitelline Membrane ◽  
Phylogenetic Significance ◽  
Inner Region

Formative processes of the blastoderm, germ disk, germ rudiment and embryonic membranes in the mnesarchaeid moth, Mnesarchaea fusilella, are described, and their phylogenetic significance is discussed. The egg is ovoid, about 0.32 mm by 0.48 mm in size. Below the thin chorion lies a very thick vitelline membrane. In the newly laid eggs, this membrane is colourless, but it becomes blackly pigmented about 30 hours after oviposition. Soon after the completion of the blastoderm, the germ disk or embryonic area forms in the posteroventral region of the egg. It then invaginates into the yolk, and becomes a sac-shaped germ rudiment. After closure of its opening, the germ rudiment separates from the rudimentary serosal or extra-embryonic area Its inner region later develops into the embryo, and its outer one into the amnion. The serosa is thick and each of its cells has two nuclei. The formative process of the germ rudiment and embryonic membranes in M. fusilella is primitive and very similar to that of the hepialid moths, Endoclita excrescens and E. sinensis. From the embryological standpoint, Mnesarchaea clearly belong to the Exoporia because of the following two synapomorphic characters: (1) formation of the thick, blackly pigmented vitelline membrane: and (2) presence of thick, bi-nucleated serosal cells.

Cytological observations on fertilization and early embryonic development in sea cucumber Apostichopus japonicus

2012 ◽  
Vol 36 (2) ◽  
pp. 272 ◽  
Author(s):  
Jie TAN ◽  
Hui-ling SUN ◽  
Fei GAO ◽  
Jing-ping YAN ◽  
Ying-hui DONG ◽  
...  
Keyword(s):  
Embryonic Development ◽  
Sea Cucumber ◽  
Apostichopus Japonicus ◽  
Early Embryonic Development

Studies on the early embryonic development of artificially-bred Siberian sturgeon(Acipenser baeri)

2010 ◽  
Vol 34 (5) ◽  
pp. 777-785 ◽  
Author(s):  
Wei SONG ◽  
Jia-kun SONG ◽  
Chun-xin FAN ◽  
Tao ZHANG ◽  
Bin WANG
Keyword(s):  
Embryonic Development ◽  
Siberian Sturgeon ◽  
Early Embryonic Development ◽  
Acipenser Baeri

scholarly journals Unfolded protein response triggers differential apoptotic mechanisms in ovaries and early embryos exposed to maternal type 1 diabetes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Aslı Okan ◽  
Necdet Demir ◽  
Berna Sozen
Keyword(s):  
Embryonic Development ◽  
Er Stress ◽  
Unfolded Protein Response ◽  
Molecular Mechanisms ◽  
Early Embryonic Development ◽  
Unfolded Protein ◽  
Caspase 12 ◽  
Early Embryos ◽  
Protein Response

AbstractDiabetes mellitus (DM) has profound effects on the female mammalian reproductive system, and early embryonic development, reducing female reproductive outcomes and inducing developmental programming in utero. However, the underlying cellular and molecular mechanisms remain poorly defined. Accumulating evidence implicates endoplasmic reticulum (ER)-stress with maternal DM associated pathophysiology. Yet the direct pathologies and causal events leading to ovarian dysfunction and altered early embryonic development have not been determined. Here, using an in vivo mouse model of Type 1 DM and in vitro hyperglycaemia-exposure, we demonstrate the activation of ER-stress within adult ovarian tissue and pre-implantation embryos. In diabetic ovaries, we show that the unfolded protein response (UPR) triggers an apoptotic cascade by the co-activation of Caspase 12 and Cleaved Caspase 3 transducers. Whereas DM-exposed early embryos display differential ER-associated responses; by activating Chop in within embryonic precursors and Caspase 12 within placental precursors. Our results offer new insights for understanding the pathological effects of DM on mammalian ovarian function and early embryo development, providing new evidence of its mechanistic link with ER-stress in mice.

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