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- W2015909441 abstract "We reported previously that chicken HIRA, a homolog of Saccharomyces cerevisiae transcriptional co-repressors Hir1p and Hir2p, possesses seven WD dipeptide motifs and an LXXLL motif in its N-terminal and C-terminal halves, respectively, required for transcription regulations. Here, by using the gene targeting technique, we generated the homozygous HIRA-deficient DT40 mutant DeltaHIRA. The HIRA deficiency caused slightly delayed cell growth and affected the opposite transcriptions of cell cycle-related genes, i.e. repressions for P18, CDC25B, and BCL-2, activations for P19 and cyclin A, and histones H2A, H2B, H3, and H4. These altered expressions were completely revived by the artificial stable expression of hemagglutinin-tagged HIRA in DeltaHIRA. The ability to rescue the delayed growth rate was preferentially aided by the N-terminal half instead of the C-terminal half. We cloned the chicken P18 genomic DNA, and we established that its promoter was located surrounding the sequence GCGGGCGC at positions -1157 to -1150. Chromatin immunoprecipitation assay revealed that the N-terminal half interacted directly or indirectly with the putative promoter region of the p18 gene, resulting in up-regulation of the gene. These results indicated that the N-terminal half of HIRA should contribute positively to the growth rate via up-regulation of a set of cell cycle-related genes, whereas the C-terminal half down-regulated another set of them without exhibiting any effect on the cell growth." @default.
- W2015909441 created "2016-06-24" @default.
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- W2015909441 date "2005-09-01" @default.
- W2015909441 modified "2023-09-28" @default.
- W2015909441 title "Different Roles of N-terminal and C-terminal Halves of HIRA in Transcription Regulation of Cell Cycle-related Genes That Contribute to Control of Vertebrate Cell Growth" @default.
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- W2015909441 doi "https://doi.org/10.1074/jbc.m501426200" @default.
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