Abstract
The proper functioning of centromeres requires a complex cascade of epigenetic events involving chromatin and kinetochore assembly; however, the precise mechanism by which this cascade proceeds is unknown. The pivotal event during kinetochore formation is the “loading,” or deposition, of CENP-A. This histone H3 variant is specific to centromeres and replaces conventional H3 in centromeric chromatin. Failure to load CENP-A into mammalian centromeres in late telophase/early G1 of the cell cycle leads to malsegregation and cell division defects in subsequent cell cycles. Mounting evidence supports the hypothesis that an RNA component is involved, although how RNAs participate in centromere formation in mammals has remained unknown. Using the marsupial model, the tammar wallaby, we show that centromeric retroelements produce small RNAs and that hypermorphic expression of these centromeric small RNAs results in disruption of CENP-A localization. We propose that tight regulation of the processing of this new class of small RNAs, crasiRNAs, is an integral component of the epigenetic framework necessary for centromere establishment.
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Abbreviations
- CENP:
-
Centromere protein
- siRNA:
-
Small interfering RNA
- RNAi:
-
RNA interference
- dsRNA:
-
Double-stranded RNA
- KERV:
-
Kangaroo endogenous retrovirus
- kLTR:
-
KERV long terminal repeat
- crasiRNA:
-
Centromere repeat-associated short interacting RNA
- H3:
-
Histone 3
- miRNA:
-
MicroRNA
- piRNA:
-
Piwi interacting RNA
- IVT:
-
In vitro transcription
- IC:
-
Immunochemistry
- FITC:
-
Fluorescein isothiocyanate
- N.A.:
-
Numerical aperture
- FACS:
-
Fluorescence activated cell sorting
- RISC:
-
RNA-induced silencing complex
- LNA:
-
Locked nucleic acid
- miSAT:
-
Minor satellite
- LINE:
-
Long interspersed nuclear element
- HAC:
-
Human artificial chromosome
- HJURP:
-
Holliday junction recognition protein
- ACA:
-
Anti-centromere antibody
- PKR:
-
Protein kinase R
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Acknowledgments
We thank the Center for Applied Genetics and Technology for instrumentation, S. Kasowitz for xlr3b dsRNA and A. Pask and M. Renfree for tammar material. A special thanks to A. Pask and B. Mellone for helpful discussion and comments on the manuscript and B. Mellone and I. Oderberg for SoftWoRx quantification protocols. This work was supported by grants from the UCRF and NSF to RJO.
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Carone, D.M., Zhang, C., Hall, L.E. et al. Hypermorphic expression of centromeric retroelement-encoded small RNAs impairs CENP-A loading. Chromosome Res 21, 49–62 (2013). https://doi.org/10.1007/s10577-013-9337-0
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DOI: https://doi.org/10.1007/s10577-013-9337-0