Evolution of the Transposable Element Mariner in Drosophila Species
AUTOR(ES)
Maruyama, K.
RESUMO
The distribution of the transposable element mariner was examined in the genus Drosophila. Among the eight species comprising the melanogaster species subgroup, the element is present in D. mauritiana, D. simulans, D. sechellia, D. yakuba and D. teissieri, but it is absent in D. melanogaster, D. erecta and D. orena. Multiple copies of mariner were sequenced from each species in which the element occurs. The inferred phylogeny of the elements and the pattern of divergence were examined in order to evaluate whether horizontal transfer among species or stochastic loss could better account for the discontinuous distribution of the element among the species. The data suggest that the element was present in the ancestral species before the melanogaster subgroup diverged and was lost in the lineage leading to D. melanogaster and the lineage leading to D. erecta and D. orena. This inference is consistent with the finding that mariner also occurs in members of several other species subgroups within the overall melanogaster species group, Within the melanogaster species subgroup, the average divergence of mariner copies between species was lower than the coding region of the alcohol dehydrogenase (Adh) gene. However, the divergence of mariner elements within species was as great as that observed for Adh. We conclude that the relative sequence homogeneity of mariner elements within species is more likely a result of rapid amplification of a few ancestral elements than of concerted evolution. The mariner element may also have had unequal mutation rates in different lineages.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1204470Documentos Relacionados
- Insertion and Excision of the Transposable Element Mariner in Drosophila
- The Transposable Element Mariner Mediates Germline Transformation in Drosophila Melanogaster
- Germline Transformation of Drosophila Virilis with the Transposable Element Mariner
- Introduction of the Transposable Element Mariner into the Germline of Drosophila Melanogaster
- Excision of the Drosophila transposable element mariner: identification and characterization of the Mos factor.