Quantifying the mechanisms of domain gain in animal proteins
View / Open Files
MetadataShow full item record
Buljan, M., Frankish, A., & Bateman, A. (2010). Quantifying the mechanisms of domain gain in animal proteins. http://www.dspace.cam.ac.uk/handle/1810/238170
RIGHTS : This article is licensed under the BioMed Central licence at http://www.biomedcentral.com/about/license which is similar to the 'Creative Commons Attribution Licence'. In brief you may : copy, distribute, and display the work; make derivative works; or make commercial use of the work - under the following conditions: the original author must be given credit; for any reuse or distribution, it must be made clear to others what the license terms of this work are.
Abstract Background Protein domains are protein regions that are shared among different proteins and are frequently functionally and structurally independent from the rest of the protein. Novel domain combinations have a major role in evolutionary innovation. However, the relative contributions of the different molecular mechanisms that underlie domain gains in animals are still unknown. By using animal gene phylogenies we were able to identify a set of high confidence domain gain events and by looking at their coding DNA investigate the causative mechanisms. Results Here we show that the major mechanism for gains of new domains in metazoan proteins is likely to be gene fusion through joining of exons from adjacent genes, possibly mediated by non-allelic homologous recombination. Retroposition and insertion of exons into ancestral introns through intronic recombination are, in contrast to previous expectations, only minor contributors to domain gains and have accounted for less than 1% and 10% of high confidence domain gain events, respectively. Additionally, exonization of previously non-coding regions appears to be an important mechanism for addition of disordered segments to proteins. We observe that gene duplication has preceded domain gain in at least 80% of the gain events. Conclusions The interplay of gene duplication and domain gain demonstrates an important mechanism for fast neofunctionalization of genes.
This record's URL: http://www.dspace.cam.ac.uk/handle/1810/238170
All Rights Reserved
Rights Holder: Buljan et al.; licensee BioMed Central Ltd.
Licence URL: https://www.rioxx.net/licenses/all-rights-reserved/