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Imprinted genes that regulate early mammalian growth are coexpressed in somatic stem cells.
oleh: Jonathan S Berg, Kuanyin K Lin, Corinne Sonnet, Nathan C Boles, David C Weksberg, Hoang Nguyen, Lowenna J Holt, Danny Rickwood, Roger J Daly, Margaret A Goodell
| Format: | Article |
|---|---|
| Diterbitkan: | Public Library of Science (PLoS) 2011-01-01 |
Deskripsi
Lifelong, many somatic tissues are replenished by specialized adult stem cells. These stem cells are generally rare, infrequently dividing, occupy a unique niche, and can rapidly respond to injury to maintain a steady tissue size. Despite these commonalities, few shared regulatory mechanisms have been identified. Here, we scrutinized data comparing genes expressed in murine long-term hematopoietic stem cells with their differentiated counterparts and observed that a disproportionate number were members of the developmentally-important, monoallelically expressed imprinted genes. Studying a subset, which are members of a purported imprinted gene network (IGN), we found their expression in HSCs rapidly altered upon hematopoietic perturbations. These imprinted genes were also predominantly expressed in stem/progenitor cells of the adult epidermis and skeletal muscle in mice, relative to their differentiated counterparts. The parallel down-regulation of these genes postnatally in response to proliferation and differentiation suggests that the IGN could play a mechanistic role in both cell growth and tissue homeostasis.