title: Spatial p21 expression profile in the mid-term mouse embryo.
abstract: Throughout development cells make the decision to proliferate, arrest or die. Control of this process is essential for normal development, with unrestrained cell proliferation and cell death underlying the origin and progression of disease. The cell-cycle is tightly regulated by a number of factors including the cyclin-dependent kinase inhibitor 1A (Cdkn1a), termed p21 (or Cip1 or WAF1). p21 acts as a negative regulator of cell-cycle progression by binding and inhibiting complexes formed between the cyclin-dependent kinases and their catalytic partners the cyclins. In this report we identify the temporal spatial expression profile of p21 in the developing mid-term mouse embryo using a p21-LacZ reporter mouse line. Expression of p21 was restricted to specific regions with a correspondence to both areas of terminal differentiation and active remodelling. A complex temporal and spatial relationship between p21 expression and regions of apoptosis was evident. A protective role with regard to apoptosis for p21 is proposed.
authors.affiliation: Division of Developmental Biology, The Roslin Institute and Royal (Dick), School of Veterinary Studies, University of Edinburgh, Roslin, EH25 9PS, UK. d.vasey@dundee.ac.uk
authors.forename: Douglas B
authors.initials: DB
authors.lastname: Vasey
authors.forename: C Roland
authors.initials: CR
authors.lastname: Wolf
authors.forename: Ken
authors.initials: K
authors.lastname: Brown
authors.forename: C Bruce A
authors.initials: CB
authors.lastname: Whitelaw
mesh_terms: D000818:Animals; D017209:Apoptosis; D002453:Cell Cycle / Q000502:physiology; D002454:Cell Differentiation; D002455:Cell Division / Q000502:physiology; D050759:Cyclin-Dependent Kinase Inhibitor p21 / Q000235:genetics / Q000378:metabolism*; D004622:Embryo, Mammalian / Q000378:metabolism / Q000502:physiology*; D005260:Female; D017930:Genes, Reporter / Q000502:physiology*; D007150:Immunohistochemistry; D007763:Lac Operon / Q000235:genetics / Q000502:physiology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D008822:Mice, Transgenic
chemical_list: D050759:Cyclin-Dependent Kinase Inhibitor p21