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Genomic Imprinting and Inheritance02:30

Genomic Imprinting and Inheritance

Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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DNA methylation patterns reflect epigenetic reprogramming in bovine embryos.

Heiner Niemann1, Joseph W Carnwath, Doris Herrmann

  • 1Institute of Farm Animal Genetics (FLI), Mariensee, Neustadt, Germany. heiner.niemann@fli.bund.de

Cellular Reprogramming
|February 6, 2010
PubMed
Summary
This summary is machine-generated.

Assisted reproduction technology (ART) and somatic cell nuclear transfer (SCNT) cause epigenetic changes in embryos. Specific DNA methylation patterns can identify embryo quality and reprogramming success after SCNT.

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Area of Science:

  • Epigenetics
  • Developmental Biology
  • Reproductive Science

Background:

  • Assisted reproduction technologies (ART) and somatic cell nuclear transfer (SCNT) are crucial for reproductive medicine and research.
  • Understanding the epigenetic reprogramming following these procedures is vital for assessing embryo development and quality.

Purpose of the Study:

  • To investigate epigenetic alterations in blastocysts produced via in vitro fertilization (IVF) or SCNT compared to in vivo development.
  • To identify specific DNA methylation patterns associated with ART and SCNT procedures.
  • To evaluate the extent of epigenetic reprogramming after SCNT.

Main Methods:

  • Screening of 41 amplicons across 25 developmentally important genes (1079 CpG sites) for methylation analysis.
  • Methylation analysis of DNA from pooled blastocysts representing in vivo, in vitro, and SCNT-reconstructed embryos.
  • Analysis of mRNA expression for eight selected genes.

Main Results:

  • A subset of amplicons distinguished between embryos from different developmental origins (in vivo, in vitro, SCNT).
  • SCNT embryos showed massive epigenetic reprogramming, indicated by reduced DNA methylation levels.
  • Unique methylation patterns at specific loci (hotspot loci) were identified for each embryo class, suggesting metastable epialleles.
  • No direct correlation was found between DNA methylation levels and mRNA expression for the analyzed genes.

Conclusions:

  • Specific amplicons can serve as biomarkers for evaluating blastocyst quality and SCNT reprogramming efficiency.
  • This approach aids in localizing epigenetic control regions within genes and studying stem cell differentiation.
  • Epigenetic profiling provides insights into the developmental outcomes of ART and SCNT.