Here, there and everywhere: Ecology and biology of the Dependentiae phylum

Our view of bacterial diversity has been dramatically impacted by cultivation‐independent approaches such as metagenomics and 16S rRNA gene sequencing. Consequently, most bacterial phyla known to date are only documented by the presence of DNA sequences in databases and lack cultivated representativ...

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Published in:Environmental microbiology 2023-03, Vol.25 (3), p.597-605
Main Authors: Weisse, Louis, Héchard, Yann, Moumen, Bouziane, Delafont, Vincent
Format: Article
Language:English
Subjects:
Adaptation
Bacteria
Bacteria - genetics
Bacteriology
Biodiversity
Biology
Candidatus Dependentiae
Cultivation
Dark matter
DNA sequences
Ecology
Ecology, environment
Gene sequencing
Genome, Bacterial
Genomics
Life Sciences
Metagenomics
Microbiology and Parasitology
Microorganisms
Nucleotide sequence
Phylogeny
Protists
RNA, Ribosomal, 16S - genetics
rRNA 16S
Symbiosis
Systematics, Phylogenetics and taxonomy
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Summary:Our view of bacterial diversity has been dramatically impacted by cultivation‐independent approaches such as metagenomics and 16S rRNA gene sequencing. Consequently, most bacterial phyla known to date are only documented by the presence of DNA sequences in databases and lack cultivated representatives. This bacterial majority that is yet‐to‐be cultivated, is forming the ‘Microbial Dark Matter’, (MDM) a consortium, whose ecology and biology remain largely unexplored. The Candidatus Dependentiae stands as one of many phyla within this MDM, found worldwide in various environments. Genomic evidence suggests ancestral, unusual adaptations of all Ca. Dependentiae to a host dependent lifestyle. In line with this, protists appear to be important for Ca. Dependentiae biology, as revealed by few recent studies, which enabled their growth in laboratory through host cultivation. However, the Ca. Dependentiae still remain to this day a poorly documented phylum. The present review aims to summarize the current knowledge accumulated on this often found, but rarely highlighted, bacterial phylum.
ISSN:1462-2912
1462-2920
DOI:10.1111/1462-2920.16307