Transcription and RNA interference in the formation of heterochromatin

Review

关键词: POSITION-EFFECT VARIEGATION;    DOUBLE-STRANDED-RNA;    FISSION YEAST;    HISTONE H3;    EPIGENETIC CONTROL;    LYSINE-9 METHYLATION;    CHROMODOMAIN PROTEIN;    UBIQUITIN LIGASE;    DOMAIN PROTEIN;    DROSOPHILA;   

DOI  :  10.1038/nature05914

来源: SCIE

【 摘 要 】

Transcription in heterochromatin seems to be an oxymoron - surely the 'silenced' form of chromatin should not be transcribed. But there have been frequent reports of low-level transcription in heterochromatic regions, and several hundred genes are found in these regions in Drosophila. Most strikingly, recent investigations implicate RNA interference mechanisms in targeting and maintaining heterochromatin, and these mechanisms are inherently dependent on transcription. Silencing of chromatin might involve transacting sources of the crucial small RNAs that carry out RNA interference, but in some cases, transcription of the region to be silenced seems to be required - an apparent contradiction.

【 授权许可】

Free