Bursts and horizontal evolution of DNA transposons in the speciation of pseudotetraploid salmonids

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dc.contributor.authorde Boer, Johan G
dc.contributor.authorYazawa, Ryosuke
dc.contributor.authorDavidson, William S
dc.contributor.authorKoop, Ben F
dc.date.accessioned2014-08-07T22:40:44Z
dc.date.available2014-08-07T22:40:44Z
dc.date.copyright2007en_US
dc.date.issued2007-11-16
dc.descriptionBioMed Centralen_US
dc.description.abstractBackground: Several genome duplications have occurred in the evolutionary history of teleost fish. In returning to a stable diploid state, the polyploid genome reorganized, and large portions are lost, while the fish lines evolved to numerous species. Large scale transposon movement has been postulated to play an important role in the genome reorganization process. We analyzed the DNA sequence of several large loci in Salmo salar and other species for the presence of DNA transposon families. Results: We have identified bursts of activity of 14 families of DNA transposons (12 Tc1-like and 2 piggyBac-like families, including 11 novel ones) in genome sequences of Salmo salar. Several of these families have similar sequences in a number of closely and distantly related fish, lamprey, and frog species as well as in the parasite Schistosoma japonicum. Analysis of sequence similarities between copies within the families of these bursts demonstrates several waves of transposition activities coinciding with salmonid species divergence. Tc1-like families show a master gene-like copying process, illustrated by extensive but short burst of copying activity, while the piggyBac-like families show a more random copying pattern. Recent families may include copies with an open reading frame for an active transposase enzyme. Conclusion: We have identified defined bursts of transposon activity that make use of masterslave and random mechanisms. The bursts occur well after hypothesized polyploidy events and coincide with speciation events. Parasite-mediated lateral transfer of transposons are implicateden_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipWe greatfully acknowledge the financial support of NSERC and Genome Canada.en_US
dc.identifier.citationdeBoer et al. Bursts and horizontal evolution of DNA transposons in the speciation of pseudotetraploid salmonids. BMC Genomics 2007, 8 :422en_US
dc.identifier.urihttp://www.biomedcentral.com/1471-2164/8/422
dc.identifier.urihttp://dx.doi.org/doi:10.1186/1471-2164-8-422
dc.identifier.urihttp://hdl.handle.net/1828/5524
dc.language.isoenen_US
dc.publisherBioMed Centralen_US
dc.titleBursts and horizontal evolution of DNA transposons in the speciation of pseudotetraploid salmonidsen_US
dc.typeArticleen_US

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