Adaptive Divergence in MHC Genes of African Cichlids
Author Information
Author(s): Blais Jonatan, Rico Ciro, van Oosterhout Cock, Cable Joanne, Turner George F., Bernatchez Louis
Primary Institution: Département de Biologie, Québec-Océan, Université Laval, Quebec, Canada
Hypothesis
We hypothesized that odor differences between these species may involve differences in MHC genes accumulated under divergent host-parasite coevolution.
Conclusion
The study provides evidence that local host-parasite coevolution may have driven adaptive divergence in MHC alleles, influencing mate choice and leading to reproductive isolation.
Supporting Evidence
- Divergent selection on functional alleles was inferred from higher genetic divergence at putative antigen binding sites.
- Sympatric populations of these fish species differed significantly in communities of eukaryotic parasites.
- Evidence of significant genetic divergence between pairs of sympatric populations was found only at putative ABS.
Takeaway
The study found that two closely related fish species have different MHC genes, which helps them choose mates and stay apart from each other.
Methodology
The study involved sequencing MHC class II genes from two sympatric cichlid species and analyzing genetic divergence and parasite communities.
Potential Biases
Potential biases may arise from the limited geographic sampling and the focus on specific genetic markers.
Limitations
The study may not have detected all alleles present in each individual, and results must be viewed with caution due to potential biases in sampling.
Participant Demographics
The study focused on two species of cichlids, Pseudotropheus fainzilberi and P. emmiltos, from Lake Malawi.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website