GEO Logo
   NCBI > GEO > Accession DisplayHelp Not logged in | LoginHelp
GEO help: Mouse over screen elements for information.
Series GSE62075 Query DataSets for GSE62075
Status Public on Oct 06, 2014
Title Characterization of the human a9 integrin subunit gene: promoter analysis and transcriptional regulation
Organism Homo sapiens
Experiment type Expression profiling by array
Summary α9b1 is the most recent addition to the integrin family of membrane-bound receptors and consequently remains the one which is the least characterized. To better understand how transcription of the human gene encoding the α9 subunit is regulated at the molecular level, we cloned the α9 promoter and characterized the regulatory elements that are required to ensure its transcription. Transfection of α9 promoter/CAT recombinant plasmids in primary cultured cells and uveal melanoma cell lines demonstrated the presence of both negative and positive regulatory elements along the α9 promoter and positioned the basal α9 promoter to within 118 bp from the α9 mRNA start site. In vitro DNaseI footprinting and in vivo ChIP analyses demonstrated the binding of the transcription factors Sp1/Sp3, c-Myb and NFI to the most upstream α9 negative regulatory element. The transcription factors Sp1/Sp3 and NFI were found to bind the basal α9 promoter individually but Sp1 binding clearly predominates when both transcription factors are present in the same extract. Most of all, addition of tenascin-C (TNC), the ligand of α9β1, to the tissue culture plates prior to cell seeding increased α9 transcription whereas it simultaneously decreased expression of the α5 integrin subunit gene. This dual regulatory action of TNC on the transcription of the α9 and α5 genes suggests that both these integrins must work together to appropriately regulate cell adhesion, migration and differentiation that are hallmarks of tissue wound healing.
Overall design Primary cultures of human corneal epithelial cells (HCECs; number of replicates: 8), human skin epithelial cells (HSEC; number of replicates: 4), human corneal fibroblast cells (HCFCs; number of replicates: 3), human skin fibroblast cells (HSFCs; number of replicates: 3), human uveal melanocytes (UVM; number of replicates: 3), and various humal uveal melanoma cell lines (T115, T142 and T143; number of replicates: 2-3) were analyzed by gene profiling on microarrays at low culture passages (between passage 2 to 7). HCECs were also cultured on either BSA (number of replicates: 2) or on tenascin-C (number of replicates: 2) and their transcriptome analyzed by gene profiling.
Contributor(s) Duval C, Zaniolo K, Leclerc S, Salesse C, Guérin SL
Citation(s) 25746835
Submission date Oct 06, 2014
Last update date Nov 27, 2018
Contact name Karine Zaniolo
Organization name Centre de recherche du CHU de Québec
Department CUO-Recherche
Lab Sylvain Guérin
Street address 1050 Chemin Sainte-Foy
City Québec
State/province Québec
ZIP/Postal code G1S 4L8
Country Canada
Platforms (1)
GPL13607 Agilent-028004 SurePrint G3 Human GE 8x60K Microarray (Feature Number version)
Samples (32)
GSM1519360 Primary_human_corneal_epithelial_cells_rep1
GSM1519361 Primary_human_corneal_epithelial_cells_rep2
GSM1519362 Primary_human_corneal_epithelial_cells_rep3
BioProject PRJNA263181

Download family Format
SOFT formatted family file(s) SOFTHelp
MINiML formatted family file(s) MINiMLHelp
Series Matrix File(s) TXTHelp

Supplementary file Size Download File type/resource
GSE62075_RAW.tar 397.8 Mb (http)(custom) TAR (of TXT)
Processed data included within Sample table

| NLM | NIH | GEO Help | Disclaimer | Accessibility |
NCBI Home NCBI Search NCBI SiteMap