Deletion rate evolution and its effect on genome size and coding density.

Abstract:

:Deletion rates are thought to be important factors in determining the genome size of organisms in nature. Although it is indisputable that deletions, and thus deletion rates, affect genome size, it is unclear how, or indeed if, genome size is regulated via the deletion rate. Here, we employ a mathematical model to determine the evolutionary fate of deletion rate mutants. Simulations are employed to explore the interactions between deletions, deletion rate mutants, and genome size. The results show that, in this model, the fate of deletion rate mutants will depend on the fraction of essential genomic material, on the frequency of sexual recombination, as well as on the population size of the organism. We find that there is no optimal deletion rate in any state. However, at one critical coding density, all changes in deletion rate are neutral and the rate may drift either up or down. As a consequence, the coding density of the genome is expected to fluctuate around this critical density. Characteristic differences in the impact of deletion rate mutations on prokaryote and eukaryote genomes are described.

journal_name

Mol Biol Evol

authors

Pettersson ME,Kurland CG,Berg OG

doi

10.1093/molbev/msp054

subject

Has Abstract

pub_date

2009-06-01 00:00:00

pages

1421-30

issue

6

eissn

0737-4038

issn

1537-1719

pii

msp054

journal_volume

26

pub_type

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