Molecular cloning and characterization of a novel mouse epidermal differentiation gene and its promoter.
The transcription factor E2F1 is an important regulator of cell proliferation, apoptosis, and differentiation. A novel mouse gene (Eig3) was originally identified as up-regulated in E2F1-overexpressing keratinocytes by the rapid analysis of gene expression technique. An apparently full-length cDNA and a 2.8-kb genomic fragment containing the entire gene have been cloned. Sequence comparisons suggest that Eig3 is homologous to a human epidermal differentiation gene, XP5, and belongs to a family of at least 10 murine genes that are related to the small proline-rich genes involved in skin differentiation. Eig3 was expressed in adult mouse stomach and epidermis and overexpressed in keratinocytes transgenic for E2F1 or E2F4, but not in c-myc transgenics. Interestingly, Eig3 expression was highly increased in mouse skin papillomas but not in squamous carcinomas. Since there is no E2F consensus binding sequence in the promoter or first intron of Eig3, E2F regulation may be indirect.
Wang
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Department of Carcinogenesis, University of Texas M. D. Anderson Cancer Center, Smithville, Texas 78957, USA.
Johnson
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MacLeod
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D000595:Amino Acid Sequence; D000818:Animals; D000831:Animals, Newborn; D001483:Base Sequence; D015152:Blotting, Northern; D002454:Cell Differentiation / Q000235:genetics*; D002478:Cells, Cultured; D003001:Cloning, Molecular; D003062:Codon / Q000235:genetics; D055233:Cornified Envelope Proline-Rich Proteins; D018076:DNA, Complementary / Q000235:genetics; D000078404:Epidermal Cells; D004817:Epidermis / Q000254:growth & development / Q000378:metabolism*; D005091:Exons / Q000235:genetics; D005753:Gastric Mucosa / Q000378:metabolism; D007438:Introns / Q000235:genetics; D015603:Keratinocytes / Q000378:metabolism; D051379:Mice; D008822:Mice, Transgenic; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic / Q000235:genetics*; D011506:Proteins / Q000737:chemistry / Q000235:genetics*; D012333:RNA, Messenger / Q000032:analysis / Q000235:genetics; D016415:Sequence Alignment; D012867:Skin / Q000166:cytology / Q000378:metabolism / Q000473:pathology; D014407:Tumor Cells, Cultured
D003062:Codon; D055233:Cornified Envelope Proline-Rich Proteins; D018076:DNA, Complementary; C434114:Lce3c protein, mouse; D011506:Proteins; D012333:RNA, Messenger