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Messenger RNA expression patterns in bovine embryos derived from in vitro procedures and their implications for
Christine Wrenzycki1, Doris Herrmann, Andrea Lucas-Hahn
1Institute for Animal Breeding (FAL), Department of Biotechnology, Mariensee, 31535 Neustadt, Germany. wrenzycki@tzv.fal.de
Reproduction, Fertility, and Development
|March 5, 2005
Summary
Bovine embryo development relies on maternal and embryonic genomes. In vitro procedures can disrupt gene expression and epigenetic reprogramming, potentially impacting offspring health and leading to developmental abnormalities.
Area of Science:
- Reproductive Biology
- Developmental Biology
- Epigenetics
Background:
- Preimplantation bovine embryo development is initially maternally controlled, transitioning to embryonic genome activation.
- Early developmental milestones (cleavage, compaction, blastocyst formation) are sensitive to in vitro conditions.
- In vitro production and somatic nuclear transfer can alter gene expression critical for development.
Purpose of the Study:
- To investigate the impact of in vitro procedures on bovine embryonic development.
- To explore the role of epigenetic modifications in developmental abnormalities.
- To understand mechanisms underlying issues like large offspring syndrome.
Main Methods:
- Analysis of gene expression changes in bovine embryos produced in vitro.
- Investigation of epigenetic reprogramming, including DNA methylation and histone modifications.
- Examination of genomic imprinting and X-chromosome inactivation in affected embryos.
Main Results:
- In vitro procedures correlate with significant gene expression alterations (up/downregulation, induction, silencing).
- These changes are likely mediated by epigenetic modifications.
- Perturbed epigenetic reprogramming is linked to developmental abnormalities.
Conclusions:
- In vitro conditions can negatively affect bovine embryo quality and viability.
- Epigenetic alterations are key mechanisms underlying developmental issues in assisted reproductive technologies.
- Studying these epigenetic changes is crucial for improving bovine embryo development and offspring health.