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Clade of Archaea From Wikipedia, the free encyclopedia
TACK is a group of archaea, its name an acronym for Thaumarchaeota (now Nitrososphaerota), Aigarchaeota, Crenarchaeota (now Thermoproteota), and Korarchaeota, the first groups discovered. They are found in different environments ranging from acidophilic thermophiles to mesophiles and psychrophiles and with different types of metabolism, predominantly anaerobic and chemosynthetic.[4] TACK is a clade that is sister to the Asgard branch that gave rise to the eukaryotes. It has been proposed that the TACK clade be classified as Crenarchaeota and that the traditional "Crenarchaeota" (Thermoproteota) be classified as a class called "Sulfolobia", along with the other phyla with class rank or order.[5] After including the kingdom category into ICNP, the proposed name of this group is kingdom Thermoproteati (Guy and Ettema 2024).[6]
TACK | |
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Sulfolobus | |
Scientific classification ![]() | |
Domain: | Archaea |
Kingdom: | Proteoarchaeota |
Superphylum: | TACK group Guy & Ettema 2011 |
Phyla[1] | |
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Synonyms | |
The relationships are roughly as follows:
McKay et al. 2019[7] | 16S rRNA based LTP_06_2022[8][9][10] | 53 marker proteins based GTDB 08-RS214[11][12][13] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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The eocyte hypothesis proposed in the 1980s by James Lake suggests that eukaryotes emerged within the prokaryotic eocytes.[15]
One piece of evidence supporting a close relationship between TACK and eukaryotes is the presence of a homolog of the RNA polymerase subunit Rbp-8 in Thermoproteota but not in Euryarchaea.[16]
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