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The correlation between GC3 and hydropathy in human genes
Kamel Jabbari1, Stéphane Cruveiller, Oliver Clay
1Laboratoire de Génétique Moléculaire, Institut Jacques Monod, 2 Place Jussieu, 75005 Paris, France.
Gene
|November 8, 2003
Summary
Human gene GC(3) levels positively correlate with protein hydropathy, a link that is not explained by codon positions or simple chained correlations. This finding confirms a nontrivial relationship in molecular evolution.
Area of Science:
- Molecular Biology
- Genetics
- Bioinformatics
Background:
- A positive correlation exists between the guanine-cytosine (GC) content at the third codon positions of human genes (GC(3)) and the hydropathy of the proteins they encode.
- This correlation is counterintuitive as it links a protein's physical property to the base composition of synonymous sites.
Purpose of the Study:
- To establish the nontriviality of the GC(3)-hydropathy correlation.
- To refute claims that this correlation is a simple artifact of other factors.
Main Methods:
- Analysis of human gene sequences and encoded protein properties.
- Statistical examination of correlations between codon positions and protein hydropathy.
- Investigating potential intermediate properties linking GC(3) and hydropathy.
Main Results:
- The positive correlation between GC(3) and protein hydropathy is confirmed as nontrivial.
- This correlation is not a consequence of analogous correlations at the first and second codon positions.
- No simple two-step correlation adequately explains the observed relationship.
Conclusions:
- The GC(3)-hydropathy correlation is a genuine biological phenomenon.
- Explanations for this correlation require more complex models than simple chained correlations.
- Further research is needed to elucidate the mechanisms driving this link in human genes.