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DNA methylation pattern in pig in vivo produced embryos
Josef Fulka1, Helena Fulka, Tomas Slavik
1Center for Cell Therapy and Tissue Repair, IAPG Czech Academy of Sciences, 277 21 Libechov, Czech Republic.
Histochemistry and Cell Biology
|January 26, 2006
Summary
Porcine embryo development shows distinct DNA methylation patterns. Maternal pronuclei are initially methylated, with differential Inner Cell Mass and Trophectoderm cell labeling emerging in later blastocysts.
Area of Science:
- Reproductive Biology
- Developmental Biology
- Epigenetics
Background:
- DNA methylation is crucial for embryonic development.
- Understanding epigenetic reprogramming in early embryos is vital.
Purpose of the Study:
- To investigate DNA methylation patterns during porcine early embryonic development.
- To analyze the distribution of 5-methylcytosine (5-MeC) from zygote to blastocyst stages.
Main Methods:
- Utilized 5-methylcytosine (5-MeC) immunostaining.
- Examined DNA methylation in "in vivo" produced porcine embryos.
- Analyzed embryos at various stages: zygote, one-cell, morula, and blastocyst.
Main Results:
- Maternal pronuclei showed high 5-MeC labeling in one-cell embryos; paternal pronuclei showed minimal labeling.
- Intense DNA methylation labeling persisted until the late morula stage.
- In blastocysts, Inner Cell Mass (ICM) cells exhibited more intense 5-MeC labeling than Trophectodermal (TE) cells, a pattern becoming more pronounced with increased cell numbers.
Conclusions:
- Porcine embryos exhibit dynamic DNA methylation patterns during early development.
- Differential DNA methylation between ICM and TE cells emerges and intensifies as blastocysts develop.
- These findings highlight stage-specific epigenetic reprogramming in porcine embryogenesis.
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