Nanobdellati

Nanobdellati is a phylum of tiny archaea within the DPANN radiation. Many known members have reduced genomes and depend on other organisms for growth.

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DPANN archaea: A radiation of archaeal lineages characterized by small cells and genomes, including many host-dependent organisms. Nanobdellati is one of the major lineages grouped within this archaeal radiation.
Ignicoccus hospitalis: A thermophilic archaeon that serves as the host for Nanoarchaeum equitans. Its cell surface supports the attachment and growth of a well-studied Nanobdellati member.
Karl Stetter: A German microbiologist known for discovering and studying many extremophilic microorganisms. His research group isolated Nanoarchaeum equitans with Ignicoccus hospitalis.
Cultivation of microorganisms: The growth of microorganisms under controlled laboratory conditions. Few Nanobdellati have been cultivated, limiting direct tests of their biology.
Archaea: A domain of single-celled organisms distinct from bacteria and eukaryotes. Nanobdellati belongs to this domain, whose membrane chemistry and molecular machinery differ from bacteria.
Obligate symbiosis: A close biological association in which at least one partner cannot complete its life cycle independently. Some Nanobdellati cannot grow without their archaeal partners.
Nanoarchaeum equitans discovery: The identification of Nanoarchaeum equitans as a tiny archaeon attached to Ignicoccus hospitalis. This discovery brought a distinctive host-dependent archaeon to scientific attention.
Microbial dark matter: Microbial diversity known mainly from environmental DNA rather than cultured organisms. Most Nanobdellati diversity remains inferred from sequence data.
Nanoarchaeum equitans: A tiny archaeon that grows attached to the archaeon Ignicoccus hospitalis and has a highly reduced genome. This cultured species became a defining example of the small, host-dependent archaea associated with Nanobdellati.
Metabolic dependency: Reliance on another organism for metabolites needed for growth or survival. Missing biosynthetic pathways can leave Nanobdellati dependent on host-supplied compounds.