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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Tadeo, Xavier Wang, Jiyong Kallgren, Scott P. Liu, Jinqiang Reddy, Bharat D. Qiao, Feng Jia, Songtao |
| Description | Author Affiliation: Tadeo X ( Department of Biological Sciences, Columbia University, New York, New York 10027, USA) |
| Abstract | The RNAi pathway is required for heterochromatin assembly at repetitive DNA elements in diverse organisms. In fission yeast, loss of RNAi causes pericentric heterochromatin defects, compromising gene silencing and chromosome segregation. Here we show that deletion of telomere shelterin components restores pericentric heterochromatin and its functions in RNAi mutants. We further isolated a separation-of-function mutant of Poz1 and revealed that defective telomere silencing, but not telomere length control, is critical for bypassing RNAi. Further analyses demonstrated that compromising shelterin-mediated heterochromatin assembly in RNAi mutants releases heterochromatin protein Swi6, which is redistributed to pericentric regions through RNAi-independent heterochromatin assembly pathways. Given the high mobility of Swi6 protein and that increased levels of Swi6 facilitates heterochromatin spreading as well as ectopic heterochromatin assembly, our results suggest that constitutive heterochromatin domains use multiple pathways to form high-affinity platforms to restrain Swi6, thus limiting its availability and avoiding promiscuous heterochromatin formation. |
| File Format | HTM / HTML |
| ISSN | 08909369 |
| e-ISSN | 15495477 |
| DOI | 10.1101/gad.226118.113 |
| Journal | Genes & Development |
| Issue Number | 22 |
| Volume Number | 27 |
| Language | English |
| Publisher | Cold Spring Harbor Laboratory Press |
| Publisher Date | 2013-11-15 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Discipline Molecular Discipline Biology__semicolon__developmental Discipline Biology__semicolon__genetics__semicolon__cell Discipline Biology Chromatin Assembly And Disassembly Genetics Heterochromatin Metabolism Rna Interference Schizosaccharomyces Telomere-binding Proteins Chromosomal Proteins, Non-histone Mutation Schizosaccharomyces Pombe Proteins Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Genetics Developmental Biology |
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