转座因子
生物
Piwi相互作用RNA
染色质
遗传学
异染色质
基因沉默
DNA
基因组
基因
作者
Chundi Wang,Therese Solberg,Xyrus X. Maurer‐Alcalá,Estienne C. Swart,Feng Gao,Mariusz Nowacki
出处
期刊:Cell Reports
[Elsevier]
日期:2022-08-01
卷期号:40 (8): 111263-111263
被引量:27
标识
DOI:10.1016/j.celrep.2022.111263
摘要
In animal germlines, transposons are silenced at the transcriptional or post-transcriptional level to prevent deleterious expression. Ciliates employ a more direct approach by physically eliminating transposons from their soma, utilizing piRNAs to recognize transposons and imprecisely excise them. Ancient, mutated transposons often do not require piRNAs and are precisely eliminated. Here, we characterize the Polycomb Repressive Complex 2 (PRC2) in Paramecium and demonstrate its involvement in the removal of transposons and transposon-derived DNA. Our results reveal a striking difference between the elimination of new and ancient transposons at the chromatin level and show that the complex may be guided by Piwi-bound small RNAs (sRNAs). We propose that imprecise elimination in ciliates originates from an ancient transposon silencing mechanism, much like in plants and metazoans, through sRNAs, repressive methylation marks, and heterochromatin formation. However, it is taken a step further by eliminating DNA as an extreme form of transposon silencing.
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