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Accumulating Dobzhansky-Muller incompatibilities: reconciling theory and data
1Centre for the Study of Evolution, School of Life Sciences, University of Sussex, Brighton BN1 9QG, Sussex, United Kingdom. johnwe0@central.susx.ac.uk
Evolution; International Journal of Organic Evolution
|July 23, 2004
Summary
This study examines theoretical models of Dobzhansky-Muller incompatibilities (DMIs) and their ability to explain empirical patterns in evolutionary divergence. Modified models can account for observed data, suggesting new avenues for research.
Area of Science:
- Evolutionary biology
- Genetics
- Theoretical biology
Background:
- Dobzhansky-Muller incompatibilities (DMIs) are a key factor in reproductive isolation and speciation.
- Existing theoretical models, such as Orr (1995) and Kondrashov et al. (2002), make different assumptions about DMI formation during evolutionary divergence.
- These differing assumptions impact the ability to infer evolutionary processes from empirical data.
Purpose of the Study:
- To evaluate the capacity of existing theoretical models to explain three specific empirical patterns of DMI formation.
- To explore modifications of these models to better align with observed data.
- To identify methods for distinguishing between competing theoretical frameworks for DMI accumulation.
Main Methods:
- Comparative analysis of theoretical frameworks for Dobzhansky-Muller incompatibility (DMI) accumulation.
- Evaluation of model predictions against empirical data on reciprocal introgression asymmetry.
- Assessment of models' ability to explain the necessity of multiple introgressions for DMI formation.
- Testing model consistency with the constant probability of DMI formation per amino acid substitution across genetic distances.
Main Results:
- Existing theoretical models do not fully account for all observed empirical patterns of DMIs.
- Modified versions of the theoretical models demonstrate improved ability to explain the empirical data.
- Specific empirical patterns investigated include asymmetry in reciprocal introgression, multi-introgression requirements for DMI formation, and constant DMI probability per amino acid substitution.
Conclusions:
- No single existing theoretical model adequately explains all observed patterns of Dobzhansky-Muller incompatibility (DMI) formation.
- Modified theoretical frameworks show promise in reconciling theoretical predictions with empirical observations.
- Further research is needed to discriminate between these refined models and advance our understanding of speciation mechanisms.