Protein Family Expansions and Biological Complexity
Author Information
Author(s): Christine Vogel, Cyrus Chothia
Primary Institution: Medical Research Council Laboratory of Molecular Biology, Cambridge, United Kingdom
Hypothesis
How do protein family expansions correlate with the complexity of eukaryotic organisms?
Conclusion
Certain protein family expansions are linked to increases in biological complexity, while others do not contribute to complexity but help organisms adapt to their environments.
Supporting Evidence
- 194 out of 1,219 superfamilies showed a strong correlation with the number of cell types.
- Half of the correlated superfamilies are involved in extracellular processes or regulation.
- Only a small fraction of protein families have expansions that correlate with the number of cell types.
Takeaway
Scientists studied how the number of different proteins in living things relates to how complex they are, finding that some proteins help make organisms more complex while others just help them survive.
Methodology
The study analyzed the sizes of 1,219 protein families across 38 eukaryotic genomes and correlated their abundance with the number of different cell types in each organism.
Potential Biases
Potential biases in gene predictions and domain assignments may affect the results.
Limitations
The analysis is limited to 60% of proteins with good evolutionary relationship information, and the measure of complexity is based solely on the number of different cell types.
Participant Demographics
The study included 38 eukaryotic organisms, including unicellular and multicellular species from various kingdoms.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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