最后一个普遍共同祖先（LUCA）和古菌及细菌的祖先都是原核生物(progenotes)。
The last universal common ancestor (LUCA) and the ancestors of archaea and bacteria were progenotes.
机构信息
Laboratory for Molecular Evolution, Institute of Genetics and Biophysics Adriano Buzzati Traverso, CNR, Via P. Castellino, 111, 80131, Naples, Italy.
出版信息
J Mol Evol. 2011 Jan;72(1):119-26. doi: 10.1007/s00239-010-9407-2. Epub 2010 Nov 16.
The tRNA split genes of Nanoarchaeum equitans and the Met-tRNA(fMet) → fMet-tRNA(fMet) pathway, identifiable as ancestral traits, and the late appearance of DNA are used to understand the evolutionary stage at which the progenote → genote transition took place. The arguments are such as to impose that not only was the last universal common ancestor (LUCA) a progenote, but the ancestors of Archaea and Bacteria were too. Therefore, the progenote → genote transition took place in a very advanced stage of the evolution of the tree of life, and only when the ancestors of Archaea and Bacteria were already defined. These conclusions are in disagreement with commonly held beliefs.
纳米古菌（Nanoarchaeum equitans）的 tRNA 分裂基因和 Met-tRNA(fMet)→fMet-tRNA(fMet)途径可作为祖征被识别，而 DNA 的出现较晚，这有助于了解前原核生物（progenote）→原核生物（genote）的转化发生在哪个进化阶段。这些论点表明，不仅最后的普遍共同祖先（LUCA）是前原核生物，古菌和细菌的祖先也是前原核生物。因此，前原核生物→原核生物的转化发生在生命之树进化的一个非常高级的阶段，只有在前古菌和细菌的祖先已经确定之后。这些结论与人们普遍持有的观点不一致。
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