A common, non-optimal phenotypic endpoint in experimental adaptations of bacteriophage lysis time

BMC Evolutionary Biology

Richard H Heineman²  Lynne Chantranupong¹ 

[1] Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA;Section of Integrative Biology, University of Texas at Austin, Austin, Texas 78712, USA

关键词: Phenotype prediction;    Virulence;    Molecular evolution;    Lysis;    Bacteriophage;    Genetic constraint;    Life history evolution;    Optimality;    ΦX174;    Experimental evolution;   

Others  :  1141272
DOI  :  10.1186/1471-2148-12-37

 received in 2011-12-23, accepted in 2012-03-19,  发布年份 2012

【 摘 要 】

Background

Optimality models of evolution, which ignore genetic details and focus on natural selection, are widely used but sometimes criticized as oversimplifications. Their utility for quantitatively predicting phenotypic evolution can be tested experimentally. One such model predicts optimal bacteriophage lysis interval, how long a virus should produce progeny before lysing its host bacterium to release them. The genetic basis of this life history trait is well studied in many easily propagated phages, making it possible to test the model across a variety of environments and taxa.

Results

We adapted two related small single-stranded DNA phages, ΦX174 and ST-1, to various conditions. The model predicted the evolution of the lysis interval in response to host density and other environmental factors. In all cases the initial phages lysed later than predicted. The ΦX174 lysis interval did not evolve detectably when the phage was adapted to normal hosts, indicating complete failure of optimality predictions. ΦX174 grown on slyD-defective hosts which initially entirely prevented lysis readily recovered to a lysis interval similar to that attained on normal hosts. Finally, the lysis interval still evolved to the same endpoint when the environment was altered to delay optimal lysis interval. ST-1 lysis interval evolved to be ~2 min shorter, qualitatively in accord with predictions. However, there were no changes in the single known lysis gene. Part of ST-1's total lysis time evolution consisted of an earlier start to progeny production, an unpredicted phenotypic response outside the boundaries of the optimality model.

Conclusions

The consistent failure of the optimality model suggests that constraint and genetic details affect quantitative and even qualitative success of optimality predictions. Several features of ST-1 adaptation show that lysis time is best understood as an output of multiple traits, rather than in isolation.

【 授权许可】

   
2012 Chantranupong and Heineman; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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