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Zygotic Development And Stem Cell Formation

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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...

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Transient Treatment of Human Pluripotent Stem Cells with DMSO to Promote Differentiation

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Dazl promotes germ cell differentiation from embryonic stem cells.

Zhuo Yu¹, Ping Ji, Jinping Cao

¹Laboratory for Germ Cell Research, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.

Journal of Molecular Cell Biology

|September 29, 2009

Summary

Scientists derived sperm and oocytes directly from mouse embryonic stem cells (mESCs) by ectopically expressing the Deleted in Azoospermia-Like (Dazl) gene. This novel method bypasses embryoid body formation, offering a new pathway for in vitro gamete generation.

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Area of Science:

Developmental Biology
Stem Cell Biology
Reproductive Biology

Background:

Embryonic stem cells (ESCs) can differentiate into germ cells, typically requiring embryoid body (EB) formation.
Deriving functional gametes from ESCs in vitro remains a significant challenge in regenerative medicine.

Purpose of the Study:

To establish a novel method for deriving germ cells directly from mouse ESCs (mESCs) without EB formation.
To investigate the role of Deleted in Azoospermia-Like (Dazl) in germ cell differentiation from mESCs.

Main Methods:

Ectopic expression of the germ cell-specific gene Dazl in cultured mESCs.
Analysis of germ cell marker expression and functional gamete formation (sperm and oocytes).
Assessment of Dazl's effect on key developmental genes like Nanog and germ cell-specific genes (Stella, MVH, Prdm1) via knockdown experiments.

Main Results:

Ectopic Dazl expression induced the formation of motile tailed-sperm and oocytes directly from mESCs.
Transient Dazl overexpression suppressed Nanog expression while inducing germ cell nuclear antigen.
Dazl knockdown led to decreased expression of germ cell markers Stella, MVH, and Prdm1.

Conclusions:

Dazl acts as a master regulatory gene controlling germ cell differentiation.
Ectopic Dazl expression is sufficient to drive dynamic differentiation of mESCs into functional gametes in vitro.
This approach offers a potential new strategy for in vitro gamete production and reproductive research.