ArticleMolecular biology and evolution2016
Comparative Genomics of Candidate Phylum TM6 Suggests That Parasitism Is Widespread and Ancestral in This Lineage.
Article in Molecular biology and evolution, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 42 papers.
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42 citing papers in PubMed, 85 citations in OpenAlex.
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Corrections and comments
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Authors and funding
4 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Candidate phylum TM6 is a major bacterial lineage recognized through culture-independent rRNA surveys to be low abundance members in a wide range of habitats; however, they are poorly characterized due to a lack of pure culture representatives. Two recent genomic studies of TM6 bacteria revealed small genomes and limited gene repertoire, consistent with known or inferred dependence on eukaryotic hosts for their metabolic needs. Here, we obtained additional near-complete genomes of TM6 populations from agricultural soil and upflow anaerobic sludge blanket reactor metagenomes which, together with the two publicly available TM6 genomes, represent seven distinct family level lineages in the TM6 phylum. Genome-based phylogenetic analysis confirms that TM6 is an independent phylum level lineage in the bacterial domain, possibly affiliated with the Patescibacteria superphylum. All seven genomes are small (1.0-1.5 Mb) and lack complete biosynthetic pathways for various essential cellular building blocks including amino acids, lipids, and nucleotides. These and other features identified in the TM6 genomes such as a degenerated cell envelope, ATP/ADP translocases for parasitizing host ATP pools, and protein motifs to facilitate eukaryotic host interactions indicate that parasitism is widespread in this phylum. Phylogenetic analysis of ATP/ADP translocase genes suggests that the ancestral TM6 lineage was also parasitic. We propose the name Dependentiae (phyl. nov.) to reflect dependence of TM6 bacteria on host organisms.
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