Related Experiment Video
Updated: Jun 6, 2026
12:09
Protocol for Human Blastoids Modeling Blastocyst Development and Implantation
Published on: August 10, 2022
Establishing three blastocyst lineages--then what?
Malgorzata Gasperowicz1, David R C Natale
1Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, Alberta, Canada.
Biology of Reproduction
|December 3, 2010
Summary
Early mouse embryo development forms three cell lineages by day 4. This review details molecular mechanisms driving lineage specification and extraembryonic tissue development, including yolk sac formation.
Area of Science:
- Developmental biology
- Molecular embryology
- Cell lineage specification
Background:
- Mouse embryo development to blastocyst stage takes 3-4 days post-fertilization.
- Formation of trophectoderm, epiblast, and primitive endoderm lineages occurs during this period.
- Previous research explored gene expression, signaling, and cell interactions in lineage specification.
Purpose of the Study:
- To review molecular mechanisms of blastocyst lineage formation.
- To highlight differentiation processes for extraembryonic tissues.
- To discuss extraembryonic ectoderm and endoderm roles in yolk sac development.
Main Methods:
- Literature review of recent molecular contributions.
- Focus on epigenetic factors in lineage specification.
- Analysis of differentiation pathways for extraembryonic tissues.
Main Results:
- Recent studies elucidate molecular control of trophectoderm, epiblast, and primitive endoderm formation.
- Epigenetics plays a crucial role in establishing distinct cell lineages.
- Key processes in extraembryonic ectoderm and endoderm development are identified.
Conclusions:
- Understanding molecular mechanisms is key to deciphering early embryonic development.
- Further research on extraembryonic lineages informs developmental biology.
- This review consolidates current knowledge on blastocyst lineage formation and extraembryonic tissue development.
Related Concept Videos
01:33Cleavage and Blastulation
After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
01:56Gastrulation
Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata will form...
01:10Zygotic Development And Stem Cell Formation
The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...