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Imprinted genes that regulate early mammalian growth are coexpressed in somatic stem cells


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.

Type Journal
Authors Berg, S.B.; Lin, K.K.; Sonnet, C.; Boles, N.C.; Weksberg, D.C.; Nguyen, H.; Holt, L.J.; Rickwood, D.; Daly, R.J.; Goodell, M.A.
Publisher Name PLoS One
Published Date 2011-11-01
Published Volume 6
Published Issue 10
Published Pages e26410
Status Published in-print
URL link to publisher's version
OpenAccess link to author's accepted manuscript version