横向基因转移、重排与和解
Lateral Gene Transfer, Rearrangement and Reconciliation
摘要：
背景祖先基因顺序重建模型逐步整合了不同的进化模式和过程，如不平等的基因内容，基因复制，并通过协调基因树隐含序列进化。在单细胞生物体中，这些模型迄今为止忽略了横向基因转移，尽管它可能对这些模型产生重要的混淆作用，以及通过检测整个基因簇的转移来提供关于基因功能的丰富信息来源。结果.我们报告了一个算法及其实现，DeCoLT，重建祖先的基因组组织的基础上调和基因树，总结信息序列进化，基因起源，复制，丢失，和横向转移。DeCoLT在多项式时间内找到重排的最小数量，计算为基因对之间相邻性的增加和破坏的数量。我们将DeCoLT应用于来自36个蓝藻基因组的1099个基因家族。结论DeCoLT能够在几个小时内重建35个祖先细菌基因组与1000个基因家族的邻接关系，并检测共转移基因的簇。由于对基因组组织没有约束，邻接可以推广到基因之间的任何关系，以重建具有相同框架的祖先相互作用，功能或复合物。
英文摘要：
Background. Models of ancestral gene order reconstruction have progressively integrated different evolutionary patterns and processes such as unequal gene content, gene duplications, and implicitly sequence evolution via reconciled gene trees. In unicellular organisms, these models have so far ignored lateral gene transfer, even though it can have an important confounding effect on such models, as well as a rich source of information on the function of genes through the detection of transfers of entire clusters of genes. Result. We report an algorithm together with its implementation, DeCoLT, that reconstructs ancestral genome organization based on reconciled gene trees which summarize information on sequence evolution, gene origination, duplication, loss, and lateral transfer. DeCoLT finds in polynomial time the minimum number of rearrangements, computed as the number of gains and breakages of adjacencies between pairs of genes. We apply DeCoLT to 1099 gene families from 36 cyanobacteria genomes. Conclusion. DeCoLT is able to reconstruct adjacencies in 35 ancestral bacterial genomes with a thousand genes families in a few hours, and detects clusters of co-transferred genes. As there is no constraint on genome organization, adjacencies can be generalized to any relationship between genes to reconstruct ancestral interactions, functions or complexes with the same framework.
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