Nucleosome Organization in Leishmania tarentolae SL RNA Genes
Author Information
Author(s): Robert A Hitchcock, Sean Thomas, David A Campbell, Nancy R Sturm
Primary Institution: University of California at Los Angeles
Hypothesis
The transcriptional activity of the SL RNA gene cassette expressed on the pX plasmid is influenced by nucleosome positioning and epigenetic factors.
Conclusion
Nucleosome interference is likely the major factor in the apparent transcriptional repression of the SL RNA gene cassette.
Supporting Evidence
- The genomic SL RNA genes and the episome did not co-localize within the nucleus.
- Nucleosomes on the pX-tSL episome were randomly distributed, reducing transcription factor access.
- Cloning of the episome transfectants revealed a range of transcriptional activities.
Takeaway
This study found that the way DNA is packed in cells can affect how genes are turned on or off, especially in a type of parasite called Leishmania.
Methodology
The study used fluorescent in situ hybridization (FISH) and micrococcal nuclease digestion to analyze nucleosome positioning and transcriptional activity.
Limitations
The study did not explore the effects of DNA modifications on transcriptional regulation.
Digital Object Identifier (DOI)
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