Category: Uncategorized

MESSY BOLT-ONS. "A patchy prokaryotic distribution of preeukaryotic features is what advocates of rampant LGT as a crucial evolutionary process should expect." (LGT = Lateral gene transfer). http://www.pnas.org/content/112/33/10278.full View in LinkedIn

FRAGMENT FROM NATURE this next two weekends continues with the topic of spider web geometry, structure and function. That such small creatures can be so smart has been confounding, until the recent finding that in some small spiders, their central nervous system actually occupies ~80% of their body cavity and a quarter of their keg cavities, in contrast to other insects. https://lnkd.in/dDxNxEX View in LinkedIn

HOMOLOGS WILL CHANGE THE STORY. "One might predict a future day in which no steps (inventions or mechanisms) entailed in whatever is then the prevailing theory of eukaryogenesis are not found as homologs or reasonably matching analogs in one or another prokaryotic lineage." http://www.pnas.org/content/112/33/10278.full View in LinkedIn

FACULTATIVE ENDOSYMBIOSIS. "Paulinella and its symbionts are mutually interdependent, and neither can replicate independently, indicating that the symbiosis is the result of a transition similar in many respects to eukaryogenesis." http://www.pnas.org/content/112/33/10278.full View in LinkedIn

EXPANDING THE SAMPLE. "Additional genomic exploration among the still largely uncharacterized TACK and DPANN archaea (a newly recognized monophyletic superphylum) cannot but further narrow the prokaryote–eukaryote gap." (TACK = phyla comprising Thaumarchaeota, Aigarchaeota, Crenarchaeota, and Korarchaeota). http://www.pnas.org/content/112/33/10278.full View in LinkedIn

EXAMPLE OF ENDOSYMBIONT. "P. chromatophora "harbors photosynthetic endosymbionts derived from free-living cyanobacteria. The chromatophores are vertically transmitted and partitioned to offspring equitably. There is also substantial genomic integration between host and symbiont as a result of EGT and the invention of protein import machinery." (P= Paulinella). (EGT = external gene transfer). http://www.pnas.org/content/112/33/10278.full View in LinkedIn

EUKARYOTIC HOMOLOGS ANTICIPATED. "We might expect to find closer and closer homologs of components of the several eukaryote-specific cellular machineries [now called eukaryotic signature proteins] as we explore inferred proteomes of such archaea [the group of phyla comprising Thaumarchaeota, Aigarchaeota, Crenarchaeota, and Korarchaeota (TACK)]." http://www.pnas.org/content/112/33/10278.full View in LinkedIn

NOT RARE. "In eukaryotes, endosymbiosis is common." http://www.pnas.org/content/112/33/10278.full View in LinkedIn

ANOTHER RARE STAMP. "Even farther down the organismal path is the two-species bacterial consortium “Chlorochromatium aggregatum,” which has been championed as a model of bacterial multilineage multicellularity. In this symbiosis, green sulfur bacterial epibionts (Chlorobium chlorochromatii) surround a motile β-proteobacterium (Symbiobacter mobilis). The central bacterium relies extensively on the photosynthetic products of its epibionts and has undergone extensive genome reduction, a mark of evolved dependence." https://lnkd.in/d6GwkCt View in LinkedIn

RARE IS DOCUMENTED. "Nevertheless, syntrophic interactions between anaerobic methane-oxidizing archaea and sulfate-reducing bacteria have resulted in the evolution of aggregates with a measure of coordinated growth and reproduction between the partners." http://www.pnas.org/content/112/33/10278.full View in LinkedIn