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1 August 2004 Epigenetic and Genomic Imprinting Analysis in Nuclear Transfer Derived Bos gaurus/Bos taurus Hybrid Fetuses
Scott V. Dindot, Peter W. Farin, Charlotte E. Farin, Juan Romano, Shawn Walker, Charles Long, Jorge A. Piedrahita
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Abstract

Somatic cell nuclear transfer (NT) in cattle is an inefficient process, whereby the production of calves is hindered by low pregnancy rates as well as fetal and placental abnormalities. Interspecies models have been previously used to facilitate the identification of single nucleotide polymorphisms (SNPs) within coding regions of genes to discriminate between parental alleles in the offspring. Here we report the use of a bovine interspecies model (Bos gaurus × Bos taurus) for the assessment and characterization of epigenetic modifications and genomic imprinting in Day 40-old female NT-derived fetuses and placenta. Analysis of NT and control pregnancies indicated disruption of genomic imprinting at the X inactivation-specific transcript (XIST) locus in the chorion, but not the fetus of clones, whereas proper allelic expression of the insulin-like growth factor II (IGF2) and gene trap locus 2 (GTL2) loci was maintained in both the fetus and placenta. Analysis of the XIST differentially methylated region (DMR) in clones indicated normal patterns of methylation; however, bisulfite sequencing of the satellite I repeat element and epidermal cytokeratin promoter indicated hypermethylation in the chorion of clones when compared with controls. No differences were detected in methylation levels in the fetus proper. These results indicate that the nuclear transfer process affects gene expression patterns in the trophectoderm- and inner cell mass-derived tissues to different extents.

Scott V. Dindot, Peter W. Farin, Charlotte E. Farin, Juan Romano, Shawn Walker, Charles Long, and Jorge A. Piedrahita "Epigenetic and Genomic Imprinting Analysis in Nuclear Transfer Derived Bos gaurus/Bos taurus Hybrid Fetuses," Biology of Reproduction 71(2), 470-478, (1 August 2004). https://doi.org/10.1095/biolreprod.103.025775
Received: 6 December 2003; Accepted: 1 March 2004; Published: 1 August 2004
KEYWORDS
developmental biology
gene regulation
placenta
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