title: Abnormal gene expression in extraembryonic tissue from cloned porcine embryos.
abstract: The birth rate of cloned animals following somatic cell nuclear transfer (SCNT) is very low and the surviving animals have various developmental defects. We compared the morphology and transcriptional profile of extraembryonic tissue from three 26-d old SCNT pig fetuses with that from control fetuses. Transcriptional profiling using long-oligonucleotide microarray technology revealed 34 genes that were differentially expressed between the three groups. The differential expression of several genes involved in translational regulation was confirmed by real-time quantitative PCR and Western blot analysis. Interestingly, the expression of a translational inhibition-related gene encoding a eukaryotic translation initiation factor 4E-binding protein was significantly elevated in the SCNT samples. We concluded that the low birth rate of cloned animals could be related to abnormal expression of translational regulators in extraembryonic tissue during early pregnancy.
authors.affiliation: Center for Regenerative Medicine, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 111 Gwahangno, Yuseong-gu, Daejeon 305-806, Republic of Korea.
authors.forename: J I
authors.initials: JI
authors.lastname: Chae
authors.forename: K S
authors.initials: KS
authors.lastname: Lee
authors.forename: D J
authors.initials: DJ
authors.lastname: Kim
authors.forename: Y M
authors.initials: YM
authors.lastname: Han
authors.forename: D S
authors.initials: DS
authors.lastname: Lee
authors.forename: K K
authors.initials: KK
authors.lastname: Lee
authors.forename: D B
authors.initials: DB
authors.lastname: Koo
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000502:physiology; D015415:Biomarkers; D015153:Blotting, Western; D019976:Cloning, Organism; D016000:Cluster Analysis; D039642:Eukaryotic Initiation Factors / Q000235:genetics / Q000378:metabolism; D005321:Extraembryonic Membranes / Q000378:metabolism*; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental / Q000235:genetics*; D053652:Nuclear Transfer Techniques; D020411:Oligonucleotide Array Sequence Analysis; D010802:Phylogeny; D013552:Swine / Q000196:embryology*; D014158:Transcription, Genetic; D015854:Up-Regulation
chemical_list: D015415:Biomarkers; D039642:Eukaryotic Initiation Factors