Kryptonia

Kryptonia is a bacterial phylum with candidate status. It is a member of the FCB group.[1]

The phylum was first proposed in 2016 following the recovery of genomes from a large-scale effort to mine metagenomic and single-cell genomic datasets for novel bacterial diversity[2]. Extensive analysis of 5.2 Tb of metagenomic data from around the world suggests members of Kryptonia are found exclusively in high-temperature pH-netural geothermal springs, such as the Jinze pool (Yunnan Province, China), Dewar Creek Spring (British Columbia, Canada), and Great Boiling Spring (Nevada, USA)[2]. Due to primer mismatches, members of this phylum have been widely under-detected in 16S rRNA sequencing-based surveys of community composition.

Analysis of the first genomes recovered from this group (from four different genera) suggests that members of Kryptonia are heterotrophs with a putative capacity for iron respiration[2]. They are inferred to be incapable of some producing key metabolic compounds on their own (e.g.: biotin, certain amino acids), and thus may be metabolically dependent on other microbes in their environment, although the nature of such a relationship is unknown[2].

The name "Kryptonia" is derived from the Greek work "krupton", which means "hidden" or "secret". This is a nod to the phylum having hitherto eluded detection due to SSU rRNA primer biases.

References
  1. Eloe-Fadrosh, Emiley A.; Paez-Espino, David; Jarett, Jessica; Dunfield, Peter F.; Hedlund, Brian P.; Dekas, Anne E.; Grasby, Stephen E.; Brady, Allyson L.; Dong, Hailiang; Briggs, Brandon R.; Li, Wen-Jun (2016-01-27). "Global metagenomic survey reveals a new bacterial candidate phylum in geothermal springs". Nature Communications. 7 (1): 10476. Bibcode:2016NatCo...710476E. doi:10.1038/ncomms10476. ISSN 2041-1723. PMC 4737851. PMID 26814032.
  2. Eloe-Fadrosh, Emiley A.; Paez-Espino, David; Jarett, Jessica; Dunfield, Peter F.; Hedlund, Brian P.; Dekas, Anne E.; Grasby, Stephen E.; Brady, Allyson L.; Dong, Hailiang; Briggs, Brandon R.; Li, Wen-Jun (2016-01-27). "Global metagenomic survey reveals a new bacterial candidate phylum in geothermal springs". Nature Communications. 7 (1): 10476. Bibcode:2016NatCo...710476E. doi:10.1038/ncomms10476. ISSN 2041-1723. PMC 4737851. PMID 26814032.
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