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首页> 外文期刊>IEE Proceedings. Part N, Systems Biology >Can biochemical properties serve as selective pressure for gene selection during inter-species and endosymbiotic lateral gene transfer?
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Can biochemical properties serve as selective pressure for gene selection during inter-species and endosymbiotic lateral gene transfer?

机译:生化特性是否可以作为种间和共生内源性侧向基因转移过程中基因选择的选择压力?

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During the evolution of endosymbiosis, only one orthologous gene, either from the invader or the invaded genome, is preserved. Genetic and environmental factors are usually invoked to explain this gene preference. How biochemical parameters can play a role in the selection of genes that code for enzymes that constitute a metabolic pathway is explored. Simple Michaelis-Menten-like enzymes are considered whose kinetic parameters are randomly generated to construct two parallel homologous pathways to account for the contributions of the invaded and the invader. Steady-state fluxes as targets of natural selection are focused. Enzymes are eliminated one by one so that the total flux through the pathway is least disturbed. Analysis of the results, done by different criteria, indicate that the maximal velocities, both forward and backward, are more influential in selection than the respective Michaelis constants. This inclination disappears as metabolite concentrations are increased. It is shown that kinetic selection criteria can result in a mosaicism of enzymes in the same pathway in terms of their genetic origin. Analysis of the results using the control coefficient paradigm disclosed an expected robust correlation between flux control coefficients of enzymes and their selective elimination. Similar analyses, performed for the case of single gene transfer or for gene replication with subsequent mutation, yielded essentially similar results. The results conform with the phenomenon of genetic mosaicism found in phylogenetic analyses of single or double endosymbioses and lateral gene transfer.
机译:在共生进化过程中,仅保留了一个来自入侵者或入侵基因组的直系同源基因。通常调用遗传和环境因素来解释这种基因偏好。探索了生化参数如何在编码构成代谢途径的酶的基因选择中发挥作用。考虑简单的Michaelis-Menten样酶,其动力学参数是随机产生的,以构建两个平行的同源途径,以解释入侵者和入侵者的贡献。稳态通量是自然选择的目标。酶被一一消除,从而使通过通道的总通量受到最小的干扰。通过不同标准对结果进行的分析表明,向前和向后的最大速度比各自的米氏常数对选择的影响更大。随着代谢物浓度的增加,这种倾向消失了。结果表明,动力学选择标准可导致酶在遗传途径上沿着同一途径发生拼接。使用控制系数范例对结果进行的分析揭示了酶通量控制系数与其选择性消除之间的预期稳健相关性。对于单基因转移或后续突变的基因复制,进行了类似的分析,结果基本相似。结果与在单或双内共生酶和侧向基因转移的系统发育分析中发现的遗传镶嵌现象相符。

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