RRC ID |
30639
|
著者 |
Shirayama M, Seth M, Lee HC, Gu W, Ishidate T, Conte D Jr, Mello CC.
|
タイトル |
piRNAs initiate an epigenetic memory of nonself RNA in the C. elegans germline.
|
ジャーナル |
Cell
|
Abstract |
Organisms employ a fascinating array of strategies to silence invasive nucleic acids such as transposons and viruses. Although evidence exists for several pathways that detect foreign sequences, including pathways that sense copy number, unpaired DNA, or aberrant RNA (e.g., dsRNA), in many cases, the mechanisms used to distinguish "self" from "nonself" nucleic acids remain mysterious. Here, we describe an RNA-induced epigenetic silencing pathway that permanently silences single-copy transgenes. We show that the Piwi Argonaute PRG-1 and its genomically encoded piRNA cofactors initiate permanent silencing, and maintenance depends on chromatin factors and the WAGO Argonaute pathway. Our findings support a model in which PRG-1 scans for foreign sequences and two other Argonaute pathways serve as epigenetic memories of "self" and "nonself" RNAs. These findings suggest how organisms can utilize RNAi-related mechanisms to detect foreign sequences not by any molecular signature, but by comparing the foreign sequence to a memory of previous gene expression.
|
巻・号 |
150(1)
|
ページ |
65-77
|
公開日 |
2012-7-6
|
DOI |
10.1016/j.cell.2012.06.015
|
PII |
S0092-8674(12)00764-7
|
PMID |
22738726
|
PMC |
PMC3597741
|
MeSH |
Animals
Argonaute Proteins / genetics
Argonaute Proteins / metabolism
Caenorhabditis elegans / genetics*
Caenorhabditis elegans / metabolism
Caenorhabditis elegans Proteins / genetics
Caenorhabditis elegans Proteins / metabolism
Epigenomics*
Gene Silencing
Germ Cells / metabolism
RNA Interference
RNA, Helminth / metabolism*
RNA, Small Interfering / metabolism*
|
IF |
38.637
|
引用数 |
298
|
WOS 分野
|
BIOCHEMISTRY & MOLECULAR BIOLOGY
CELL BIOLOGY
|
リソース情報 |
線虫 |
tm1624
tm1414
tm1200
tm872 |