PMCC PMCC

Search tips
Search criteria

Advanced
Results 1-2 (2)
 

Clipboard (0)
None
Journals
Authors
Year of Publication
Document Types
issn:1567-133
1.  Ontological aspects of pluripotency and stemness gene expression pattern in the rhesus monkey 
Gene expression patterns : GEP  2011;11(3-4):285-298.
Two essential aspects of mammalian development are the progressive specialization of cells toward different lineages, and the maintenance of progenitor cells that will give rise to the differentiated components of each tissue and also contribute new cells as older cells die or become injured. The transition from totipotentiality to pluripotentiality, to multipotentiality, to monopotentiality, and then to differentiation is a continuous process during development. The ontological relationship between these different stages is not well understood. We report for the first time an ontological survey of expression of 45 putative “stemness” and “pluripotency” genes in rhesus monkey oocytes and preimplantation stage embryos, and comparison to the expression in the inner cell mass, trophoblast stem cells, and a rhesus monkey (ORMES6) embryonic stem cell line. Our results reveal that some of these genes are not highly expressed in all totipotent or pluripotent cell types. Some are predominantly maternal mRNAs present in oocytes and embryos before transcriptional activation, and diminishing before the blastocyst stage. Others are well expressed in morulae or early blastocysts, but are poorly expressed in later blastocysts or ICMs. Also, some of the genes employed to induce pluripotent stem cells from somatic cells (iPS genes) appear unlikely to play major roles as stemness or pluripotency genes in normal embryos.
doi:10.1016/j.gep.2011.02.001
PMCID: PMC3109727  PMID: 21329766
stem cell; cell lineage; embryo; trophoblast
2.  The PcG Gene Sfmbt2 is Paternally Expressed in Extraembryonic Tissues 
Gene expression patterns : GEP  2007;8(2):107-116.
Genomic imprinting has dramatic effects on placental development, as has been clearly observed in interspecific hybrid, somatic cell nuclear transfer, and uniparental embryos. In fact, the earliest defects in uniparental embryos are evident first in the extraembryonic trophoblast. We performed a microarray comparison of gynogenetic and androgenetic mouse blastocysts, which are predisposed to placental pathologies, to identify imprinted genes. In addition to identifying a large number of known imprinted genes, we discovered that the Polycomb group (PcG) gene Sfmbt2 is imprinted. Sfmbt2 is expressed preferentially from the paternal allele in early embryos, and in later stage extraembryonic tissues. A CpG island spanning the transcriptional start site is differentially methylated on the maternal allele in e14.5 placenta. Sfmbt2 is located on proximal chromosome 2, in a region known to be imprinted, but for which no genes had been identified until now. This possibly identifies a new imprinted domain within the murine genome. We further demonstrate that murine SFMBT2 protein interacts with the transcription factor YY1, similar to the Drosophila PHO-RC.
doi:10.1016/j.modgep.2007.09.005
PMCID: PMC2220043  PMID: 18024232
Genomic Imprinting; Sfmbt2; PcG gene; Extraembryonic tissues; placenta; MMU2; YY1; microarrays; uniparental embryos

Results 1-2 (2)