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Nucleic Acids Res ; 42(6): 3551-64, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24413563

RESUMO

CpG dinucleotides are known to play a crucial role in regulatory domains, affecting gene expression in their natural context. Here, we demonstrate that intragenic CpG frequency and distribution impacts transgene and genomic gene expression levels in mammalian cells. As shown for the Macrophage Inflammatory Protein 1α, de novo RNA synthesis correlates with the number of CpG dinucleotides, whereas RNA splicing, stability, nuclear export and translation are not affected by the sequence modification. Differences in chromatin accessibility in vivo and altered nucleosome positioning in vitro suggest that increased CpG levels destabilize the chromatin structure. Moreover, enriched CpG levels correlate with increased RNA polymerase II elongation rates in vivo. Interestingly, elevated CpG levels particularly at the 5' end of the gene promote efficient transcription. We show that this is a genome-wide feature of highly expressed genes, by identifying a domain of ∼700 bp with high CpG content downstream of the transcription start site, correlating with high levels of transcription. We suggest that these 5' CpG domains are required to distort the chromatin structure and to increase gene activity.


Assuntos
Ilhas de CpG , Elementos Reguladores de Transcrição , Sítio de Iniciação de Transcrição , Transcrição Gênica , Animais , Células CHO , Linhagem Celular , Quimiocina CCL3/genética , Cromatina/química , Cricetinae , Cricetulus , Fator Estimulador de Colônias de Granulócitos e Macrófagos/genética , Células HEK293 , Humanos , Camundongos , Dados de Sequência Molecular , Biossíntese de Proteínas , Processamento de Proteína Pós-Traducional , Elongação da Transcrição Genética , Transgenes
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