MeCP2 knockdown reveals DNA methylation-independent gene repression of target genes in living cells and a bias in the cellular location of target gene products
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概要
- 論文の詳細を見る
MeCP2, a methyl-CpG binding domain (MBD) protein, is known to bind to methylated CpG sites via a conserved MBD, leading to transcriptional repression. However, studies in cell-free system for gene repression and MeCP2 binding have suggested that DNA methylation-independent repression also occurs in living cells. It has been difficult to characterize the target genes of MeCP2 because a limited number have been identified to date. In this context, we screened for MeCP2 target genes using knockdown (KD) experiments combined with microarray gene expression analyses. Of the 49 genes that showed a more than three-fold increase in expression in two independent KD experiments conducted with different siRNA sets, unexpectedly, half (24 genes) did not contain promoter CpG islands (CGIs). Of seven selected genes that did contain CGIs, only two were methylated at the CGI, bound MeCP2 before KD, and reduced MeCP2 after KD. For three, MeCP2 was observed to bind to the unmethylated CGI before KD, and for one MeCP2 was reduced after KD. Another two genes neither had DNA methylation nor bound MeCP2 before KD. Gene ontology analysis suggested that MeCP2 represses a certain group of genes. These results suggest that in addition to the canonical gene repression function, MeCP2 can repress gene expression by binding to unmethylated DNA in particular genes in living cells.
- 日本遺伝学会の論文
- 2008-04-25
著者
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Zhao Wei
Department of Medical Microbiology, Shandong University School of Medicine
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Zhao Wei
Department Of Cardiovascular Medicine Shanghai Shuguang Hospital Affiliated With Shanghai University
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Miyazaki Kohji
Division Of General Surgery Department Of Surgery Faculty Of Medicine Saga University
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Mukai Tsunehiro
Saga University The Administration Office
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Mukai T
Saga Medical School Saga
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Higashimoto Ken
Division Of Molecular Genetics And Epigenetics Department Of Biomolecular Sciences Faculty Of Medici
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Soejima H
Division Of Molecular Genetics And Epigenetics Department Of Biomolecular Sciences Faculty Of Medici
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Soejima Hidenobu
Division Of Molecular Genetics And Epigenetics Department Of Biomolecular Sciences Faculty Of Medici
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Tominaga Hirotaka
Section Of Clinical Cooperation System Center For Comprehensive Community Medicine Faculty Of Medici
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YAKABE Shinya
Division of Molecular Genetics and Epigenetics, Department of Biomolecular Sciences, Faculty of Medi
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YATSUKI Hitomi
Division of Molecular Genetics and Epigenetics, Department of Biomolecular Sciences, Faculty of Medi
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JOH Keiichiro
Division of Molecular Genetics and Epigenetics, Department of Biomolecular Sciences, Faculty of Medi
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KUDO Shinichi
Hokkaido Institute of Public Health
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Joh Keiichiro
Division Of Molecular Genetics And Epigenetics Department Of Biomolecular Sciences Faculty Of Medici
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Yatsuki H
Division Of Molecular Genetics And Epigenetics Department Of Biomolecular Sciences Faculty Of Medici
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Yakabe Shinya
Division Of Molecular Genetics And Epigenetics Department Of Biomolecular Sciences Faculty Of Medici
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