Molecular domestication — more than a sporadic episode in evolution

Molecular domestication — more than a sporadic episode in evolution
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分子驯化——不仅仅是进化中的一个零星事件

DOI:
10.1007/978-94-011-4156-7_22
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发表时间:
1999
期刊:
影响因子:
1.5
通讯作者:
D. Anxolabéhère
D. Anxolabéhère
中科院分区:
生物学4区
文献类型:
--
作者:
W. Miller;J. McDonald;D. Nouaud;D. Anxolabéhère

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转座因子是一种短而复杂的DNA或RNA片段,含有一个流线型的最小基因组,具有在外源基因组环境中进行自私复制的能力。元件内的顺式调节部分协调TE表达的克里思和模式。由TE编码的蛋白质主要通过募集宿主编码的因子来指导其自身在基因组内的繁殖。另一方面,TE编码的蛋白质具有非常有吸引力的细胞功能。这些蛋白质介导确定的DNA片段的切除、复制和整合。此外,这些蛋白质中的一些能够通过改变其原始功能来操纵重要的宿主因子。因此,如果宿主基因组通过驯服这些TE编码的蛋白质的“无政府行为”成功地驯化了它们,那么这样的事件可以被认为是一个重要的进化创新。事实上,TE衍生的顺式调控模块和蛋白质编码部分的驯化在基因组进化过程中反复发生。我们将提出突出的情况下,令人印象深刻地证明了有益的影响TE对宿主生物学在进化的时间。此外,我们将提出,分子驯化可能被认为是一个相同的进化过程,推动从“原始基因组”到“现代”的过渡在生命的早期曙光,即适应性整合的一小段自主DNA到一个复杂的调控网络的恢复。
Transposable elements are short but complex pieces of DNA or RNA containing a streamlined minimal-genome with the capacity for its selfish replication in a foreign genomic environment. Cis-regulatory sections within the elements orchestrate tempo and mode of TE expression. Proteins encoded by TEs mainly direct their own propagation within the genome by recruitment of host-encoded factors. On the other hand, TE-encoded proteins harbor a very attractive repertoire of functional abilities for a cell. These proteins mediate excision, replication and integration of defined DNA fragments. Furthermore, some of these proteins are able to manipulate important host factors by altering their original function. Thus, if the host genome succeeds in domesticating such TE-encoded proteins by taming their ‘anarchistic behavior,’ such an event can be considered as an important evolutionary innovation for its own benefit. In fact, the domestication of TE-derived cis-regulatory modules and protein coding sections took place repeatedly in the course of genome evolution. We will present prominent cases that impressively demonstrate the beneficial impact of TEs on host biology over evolutionary time. Furthermore, we will propose that molecular domestication might be considered as a resumption of the same evolutionary process that drove the transition from ‘primitive genomes’ to ‘modern’ ones at the early dawn of life, that is, the adaptive integration of a short piece of autonomous DNA into a complex regulatory network.
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