lpetrich
Contributor
Genomic exploration of the diversity, ecology, and evolution of the archaeal domain of life
In earlier accounts, they were split into Euryarchaeota (methanogens, halophiles, etc.) and Crenarchaeota (mostly hyperthermophiles). They have since been found in numerous environments, and Cren is now a part of TACK or Proteoarcheota.
"In line with their vast diversity, comparative genomics analyses reveal that Archaea are metabolically versatile and are characterized by different lifestyles. Recently discovered archaeal lineages include mesophiles and (hyper-)thermophiles, anaerobes and aerobes, autotrophs and heterotrophs, a large diversity of putative archaeal symbionts, as well as previously unknown acetogens and different groups of methanogens (see the figure)."
"Furthermore, these findings support hypotheses that suggest that all extant archaea evolved from an anaerobic autotrophic ancestor that used the Wood-Ljungdahl pathway and may have been able to obtain energy through methanogenesis."
What Do the DPANN Archaea and the CPR Bacteria Tell Us about the Last Universal Common Ancestors? - Extremophiles as Astrobiological Models - Wiley Online Library
"CPR and DPANN seem to be missing some features thought to be core features of all life. The small genomes, cells sizes and episymbiotic nature of CPR and DPANN may represent an ancestral state."
However, they may represent degeneration from some some self-sufficient state, since these organisms are mostly symbionts.
CPR: in Bacteria, DPANN: in Archaea
In earlier accounts, they were split into Euryarchaeota (methanogens, halophiles, etc.) and Crenarchaeota (mostly hyperthermophiles). They have since been found in numerous environments, and Cren is now a part of TACK or Proteoarcheota.
"In line with their vast diversity, comparative genomics analyses reveal that Archaea are metabolically versatile and are characterized by different lifestyles. Recently discovered archaeal lineages include mesophiles and (hyper-)thermophiles, anaerobes and aerobes, autotrophs and heterotrophs, a large diversity of putative archaeal symbionts, as well as previously unknown acetogens and different groups of methanogens (see the figure)."
"Furthermore, these findings support hypotheses that suggest that all extant archaea evolved from an anaerobic autotrophic ancestor that used the Wood-Ljungdahl pathway and may have been able to obtain energy through methanogenesis."
What Do the DPANN Archaea and the CPR Bacteria Tell Us about the Last Universal Common Ancestors? - Extremophiles as Astrobiological Models - Wiley Online Library
"CPR and DPANN seem to be missing some features thought to be core features of all life. The small genomes, cells sizes and episymbiotic nature of CPR and DPANN may represent an ancestral state."
However, they may represent degeneration from some some self-sufficient state, since these organisms are mostly symbionts.
CPR: in Bacteria, DPANN: in Archaea