Preimplantation Development, Pluripotency, and ES Cells
Preimplantation Development: Events and Mechanisms in Mouse Embryos
Fertilization -The process of sperm meeting the egg, resulting in the
formation of a zygote.
Cleavage - Rapid cell divisions of the zygote leading to the formation of
blastomeres.
Morula Formation - Solid ball of cells formed by cleavage divisions.
Blastocyst Formation - Morula undergoes compaction and forms a hollow
sphere with two distinct cell populations: the outer trophectoderm and the inner
cell mass (ICM).
Implantation -Blastocyst attaches to the uterine wall, leading to further
development.
Gastrulation -Process by which the three germ layers (endoderm, mesoderm, and
ectoderm) form, marking the beginning of embryonic differentiation.
Pluripotency: Meaning and Origin
Pluripotency - the ability of a cell to differentiate into all cell types of the body
except those needed for extraembryonic tissues.
Origin - Pluripotent cells originate from the inner cell mass (ICM) of the
blastocyst during early embryonic development.
Characteristics -
Self-renewal: Ability to replicate indefinitely.
Differentiation potential: Ability to give rise to all cell types in
the body.
ES Cells: In Vitro Culture and Expansion of Inner Cell Mass Cells
Embryonic Stem (ES) Cells
-Derived from the inner cell mass (ICM) of blastocysts.
- Maintain pluripotency and can be cultured in vitro.
- Offer a valuable tool for studying development and for potential
therapeutic applications.
In Vitro Culture
Preimplantation Development: Events and Mechanisms in Mouse Embryos
Fertilization -The process of sperm meeting the egg, resulting in the
formation of a zygote.
Cleavage - Rapid cell divisions of the zygote leading to the formation of
blastomeres.
Morula Formation - Solid ball of cells formed by cleavage divisions.
Blastocyst Formation - Morula undergoes compaction and forms a hollow
sphere with two distinct cell populations: the outer trophectoderm and the inner
cell mass (ICM).
Implantation -Blastocyst attaches to the uterine wall, leading to further
development.
Gastrulation -Process by which the three germ layers (endoderm, mesoderm, and
ectoderm) form, marking the beginning of embryonic differentiation.
Pluripotency: Meaning and Origin
Pluripotency - the ability of a cell to differentiate into all cell types of the body
except those needed for extraembryonic tissues.
Origin - Pluripotent cells originate from the inner cell mass (ICM) of the
blastocyst during early embryonic development.
Characteristics -
Self-renewal: Ability to replicate indefinitely.
Differentiation potential: Ability to give rise to all cell types in
the body.
ES Cells: In Vitro Culture and Expansion of Inner Cell Mass Cells
Embryonic Stem (ES) Cells
-Derived from the inner cell mass (ICM) of blastocysts.
- Maintain pluripotency and can be cultured in vitro.
- Offer a valuable tool for studying development and for potential
therapeutic applications.
In Vitro Culture
