کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2043874 1073381 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
RNA Interference Guides Histone Modification during the S Phase of Chromosomal Replication
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم کشاورزی و بیولوژیک (عمومی)
پیش نمایش صفحه اول مقاله
RNA Interference Guides Histone Modification during the S Phase of Chromosomal Replication
چکیده انگلیسی

SummaryBackgroundHeterochromatin is chromosomal material that remains condensed throughout the cell division cycle and silences genes nearby. It is found in almost all eukaryotes, and although discovered (in plants) almost 100 years ago, the mechanism by which heterochromatin is inherited has remained obscure. Heterochromatic silencing and histone H3 lysine-9 methylation (H3K9me2) depend, paradoxically, on heterochromatic transcription and RNA interference (RNAi).ResultsHere, we show that heterochromatin protein 1 in fission yeast (Swi6) is lost via phosphorylation of H3 serine 10 (H3S10) during mitosis, allowing heterochromatic transcripts to transiently accumulate in S phase. Rapid processing of these transcripts into small interfering RNA (siRNA) promotes restoration of H3K9me2 and Swi6 after replication when cohesin is recruited. We also show that RNAi in fission yeast is inhibited at high temperatures, providing a plausible mechanism for epigenetic phenomena that depend on replication and temperature, such as vernalization in plants and position effect variegation in animals.ConclusionsThese results explain how “silent” heterochromatin can be transcribed and lead to a model for epigenetic inheritance during replication.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: - Volume 18, Issue 7, 8 April 2008, Pages 490–495
نویسندگان
, , , ,