Here we report that the origins of these 13 groups unexpectedly correspond to 2,264 group-specific gene acquisitions from bacteria. Interdomain gene transfer is highly asymmetric, transfers from bacteria to archaea are more than fivefold more frequent than vice versa. Gene transfers identified at ...
Living things fall into three large groups: Archaea, Bacteria, and Eukarya. The first two have prokaryotic cells, and the third contains all eukaryotes. A relatively sparse fossil record is available to help discern what the first members of each of these lineages looked like, so it is ...
Metazoans posses eukaryotic cells which contain a distinct membrane bound nucleus, nuclear material (DNA) packaged into multiple linear chromosomes, membrane bound organelles, and modes of cellular division distinct from that of Bacteria and Archaea (Cooper and Hausman, 2009 ). Metazoans are primarily ...
The Rep proteins of ssDNA viruses of prokaryotes (bacteria and archaea) and eukaryotes display distinct domain organizations2. In eukaryotic CRESS-DNA viruses, the endonuclease domain is fused to a superfamily 3 helicase (S3H) domain22, which is responsible for unwinding of the double-stranded (ds...
(Figure3). Type A molecules in Archaea and Bacteria were clearly ancestral compared to type B molecules, while type M structures of methanogenic archaeal species appeared quite early in the monophyletic archaeal group. Eukaryal type E molecules were the most derived in the tree. It is generally...
With the discovery of extensive HGT in archaea and bacteria, the relevance and indeed the validity of the TOL has been sharply questioned (Bapteste and Boucher 2009; Bapteste et al. 2005; Doolittle 2000, 2009; Doolittle and Bapteste 2007; O'Malley and Boucher 2005; O'Malley and Koonin ...
Berkeley Electronic Press Selected WorksA theory of the origin of eukaryotic cells ("higher" cells which divide by classical mitosis) is presented. By hypo... L Sagan 被引量: 1030发表: 1967年 Towards a natural system of organisms: proposal for the domains Archaea, Bacteria and Eucarya: C.R...
The new findings also add to recent evidence that an interval of Earth's history often referred to as the Boring Billion may not have been so boring, after all. From 1.8 to 0.8 billion years ago, archaea, bacteria and a handful of complex organisms that have since gone extinct milled abou...
Among the 78 eukaryotic ribosomal proteins, eleven are specific to Eukarya, 33 are common only to Archaea and Eukarya and 34 are homologous (at least in part) to those of both Bacteria and Archaea. Several other translational proteins are common only to Eukarya and Archaea (e.g., IF2a, SR...
Several major new branches of bacteria and archaea were discovered, including Asgard archaea, the apparent closest relatives of eukaryotes and expansive groups of bacteria and archaea with small genomes thought to be symbionts of other prokaryotes. Comparative analysis of numerous prokaryote genomes ...