Functionality of Intergenic Transcription: An Evolutionary Comparison
Author Information
Author(s): Khaitovich Philipp, Kelso Janet, Franz Henriette, Visagie Johann, Giger Thomas, Joerchel Sabrina, Petzold Ekkehard, Green Richard E, Lachmann Michael, Pääbo Svante
Primary Institution: Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
Hypothesis
The study investigates the functional significance of intergenic transcription by comparing expression patterns between humans and chimpanzees.
Conclusion
Intergenic transcripts show patterns of tissue-specific conservation of their expression, suggesting they are subject to functional constraints similar to protein-coding genes.
Supporting Evidence
- Intergenic transcripts show tissue-specific conservation of expression patterns.
- About half of the expression differences between humans and chimpanzees are due to intergenic transcripts.
- Intergenic transcripts are subject to functional constraints similar to protein-coding genes.
- High overlap of expressed intergenic probes between humans and chimpanzees indicates conservation.
- Expression divergence for intergenic transcripts is greater than for exonic transcripts in certain tissues.
Takeaway
The study found that parts of our DNA that don't code for proteins still play important roles and are conserved across species, just like the parts that do code for proteins.
Methodology
The study used tiling microarrays to measure expression levels of known and intergenic transcripts in four tissues from humans and chimpanzees.
Potential Biases
Potential cross-hybridization of probes could affect the results, although this was accounted for in the analysis.
Limitations
The study primarily focused on a limited number of tissues and may not represent all intergenic transcription across different conditions.
Participant Demographics
Five human and five chimpanzee samples were used, matched for sex and relative age.
Statistical Information
P-Value
p<0.001
Confidence Interval
95% CI based on bootstrapping
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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