Gene amplification and adaptive evolution in bacteria
2009 (English)In: Annual Review of Genetics, ISSN 0066-4197, E-ISSN 1545-2948, Vol. 43, 167-195 p.Article, review/survey (Refereed) Published
Gene duplication-amplification (GDA) processes are highly relevant biologically because they generate extensive and reversible genetic variation on which adaptive evolution can act. Whenever cellular growth is restricted, escape from these growth restrictions often occurs by GDA events that resolve the selective problem. In addition, GDA may facilitate subsequent genetic change by allowing a population to grow and increase in number, thereby increasing the probability for subsequent adaptive mutations to occur in the amplified genes or in unrelated genes. Mathematical modeling of the effect of GDA on the rate of adaptive evolution shows that GDA will facilitate adaptation, especially when the supply of mutations in the population is rate-limiting. GDA can form via several mechanisms, both RecA-dependent and RecA-independent, including rolling-circle amplification and nonequal crossing over between sister chromatids. Due to the high intrinsic instability and fitness costs associated with GDAs, they are generally transient in nature, and consequently their evolutionary and medical importance is often underestimated.
Place, publisher, year, edition, pages
2009. Vol. 43, 167-195 p.
Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy) Cell and Molecular Biology
IdentifiersURN: urn:nbn:se:uu:diva-119513DOI: 10.1146/annurev-genet-102108-134805ISI: 000273580300008PubMedID: 19686082OAI: oai:DiVA.org:uu-119513DiVA: diva2:300356