Abstract
Transposons are mobile genetic elements that are a major constituent of most genomes. Organisms regulate transposable element expression, transposition, and insertion site preference, mitigating the genome instability caused by uncontrolled transposition. A recent burst of research has demonstrated the critical role of small non-coding RNAs in regulating transposition in fungi, plants, and animals. While mechanistically distinct, these pathways work through a conserved paradigm. The presence of a transposon is communicated by the presence of its RNA or by its integration into specific genomic loci. These signals are then translated into small non-coding RNAs that guide epigenetic modifications and gene silencing back to the transposon. In addition to being regulated by the host, transposable elements are themselves capable of influencing host gene expression. Transposon expression is responsive to environmental signals, and many transposons are activated by various cellular stresses. TEs can confer local gene regulation by acting as enhancers and can also confer global gene regulation through their non-coding RNAs. Thus, transposable elements can act as stress-responsive regulators that control host gene expression in cis and trans.
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Abbreviations
- dsDNA:
-
Double-stranded DNA
- dsRNA:
-
Double-stranded RNA
- HDAC:
-
Histone deacetylase
- HMT:
-
Histone methyltransferase
- LINE:
-
Long interspersed element
- LTR:
-
Long terminal repeat
- ncRNA:
-
Non-coding RNA
- ORF:
-
Open reading frame
- piRNA:
-
PIWI-interacting RNA
- Pol II, IV, V:
-
RNA polymerase II, IV, V
- RdDM:
-
RNA-dependent DNA methylation
- RDRC:
-
RNA-directed RNA polymerase complex
- RITS:
-
RNA-induced transcriptional silencing
- RNAi:
-
RNA interference
- SC:
-
Sperm cells
- SINE:
-
Short interspersed element
- siRNA:
-
Short interfering RNA
- TE:
-
Transposable element
- TIR:
-
Terminal inverted repeat
- VN:
-
Vegetative nucleus
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BSW is supported by the NIH Ruth L. Kirschstein National Research Service Award F32 GM100647-02 (NIGMS). Thanks to Teresa Lee for critical reading of the review.
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Responsible Editors: Brian P. Chadwick, Kristin C. Scott, and Beth A. Sullivan
Since this review was written, it has been shown that fission yeast heterochromatin formation at TEs in the absence of the exosome requires recruitment of RNA splicing factors. This work raises the intriguing possibility that heterochromatin formation at TEs in low glucose conditions could result from differential regulation of splicing in response to a changing environment (Lee et al. 2013)
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Wheeler, B.S. Small RNAs, big impact: small RNA pathways in transposon control and their effect on the host stress response. Chromosome Res 21, 587–600 (2013). https://doi.org/10.1007/s10577-013-9394-4
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DOI: https://doi.org/10.1007/s10577-013-9394-4