Extra-embryonic-specific imprinted expression is restricted to defined lineages in the post-implantation embryo.

Autor: Hudson QJ; CeMM, Research Center for Molecular Medicine of the Austrian Academy of Science, Lazarettgasse 14, AKH-BT 25.3, 1090 Vienna, Austria., Seidl CI, Kulinski TM, Huang R, Warczok KE, Bittner R, Bartolomei MS, Barlow DP
Jazyk: angličtina
Zdroj: Developmental biology [Dev Biol] 2011 May 15; Vol. 353 (2), pp. 420-31. Date of Electronic Publication: 2011 Feb 24.
DOI: 10.1016/j.ydbio.2011.02.017
Abstrakt: A subset of imprinted genes in the mouse have been reported to show imprinted expression that is restricted to the placenta, a short-lived extra-embryonic organ. Notably, these so-called "placental-specific" imprinted genes are expressed from both parental alleles in embryo and adult tissues. The placenta is an embryonic-derived organ that is closely associated with maternal tissue, and as a consequence, maternal contamination can be mistaken for maternal-specific imprinted expression. The complexity of the placenta, which arises from multiple embryonic lineages, poses additional problems in accurately assessing allele-specific repressive epigenetic modifications in genes that also show lineage-specific silencing in this organ. These problems require that extra evidence be obtained to support the imprinted status of genes whose imprinted expression is restricted to the placenta. We show here that the extra-embryonic visceral yolk sac (VYS), a nutritive membrane surrounding the developing embryo, shows a similar "extra-embryonic-lineage-specific" pattern of imprinted expression. We present an improved enzymatic technique for separating the bilaminar VYS and show that this pattern of imprinted expression is restricted to the endoderm layer. Finally, we show that VYS "extra-embryonic-lineage-specific" imprinted expression is regulated by DNA methylation in a similar manner as shown for genes showing multi-lineage imprinted expression in extra-embryonic, embryonic, and adult tissues. These results show that the VYS is an improved model for studying the epigenetic mechanisms regulating extra-embryonic-lineage-specific imprinted expression.
(Copyright © 2011 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: