Chlamydiales

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Chlamydiales
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Bacteria
Phylum: Chlamydiota
Class: Chlamydiia
Order: Chlamydiales
Storz and Page 1971
Families
Synonyms
  • "Amoebachlamydiales" Dharamshi et al. 2021
  • "Anoxychlamydiales" Dharamshi et al. 2019
  • Parachlamydiales Gupta et al. 2016
  • "Simkaniales" Dharamshi et al. 2021

The bacterial order Chlamydiales includes only obligately intracellular bacteria that have a chlamydia-like developmental cycle of replication and at least 80% 16S rRNA or 23S rRNA gene sequence identity with other members of Chlamydiales. Chlamydiales live in animals, insects, and protozoa.

Contents

Currently, the order Chlamydiales includes the families Chlamydiaceae, Simkaniaceae, and Waddliaceae, which have Gram-negative extracellular infectious bodies (EBs), and Parachlamydiaceae, which has variable Gram staining of EBs. The family Rhabdochlamydiaceae has been proposed.

Phylogeny

16S rRNA based LTP_08_2023 [1] [2] [3] 120 marker proteins based GTDB 08-RS214 [4] [5] [6]
Chlamydiales

Waddliaceae

Simkaniaceae

Parachlamydiaceae

Chlamydiaceae

Chlamydiales

Simkaniaceae

"Rhabdochlamydiaceae"

Waddliaceae

"Criblamydiaceae"

Parachlamydiaceae

Chlamydiaceae

Taxonomy

The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) [7] and National Center for Biotechnology Information (NCBI) [8]

See also

Related Research Articles

<span class="mw-page-title-main">Chlamydiota</span> Phylum of bacteria

The Chlamydiota are a bacterial phylum and class whose members are remarkably diverse, including pathogens of humans and animals, symbionts of ubiquitous protozoa, and marine sediment forms not yet well understood. All of the Chlamydiota that humans have known about for many decades are obligate intracellular bacteria; in 2020 many additional Chlamydiota were discovered in ocean-floor environments, and it is not yet known whether they all have hosts. Historically it was believed that all Chlamydiota had a peptidoglycan-free cell wall, but studies in the 2010s demonstrated a detectable presence of peptidoglycan, as well as other important proteins.

<i>Ureaplasma</i> Genus of bacteria

Ureaplasma is a genus of bacteria belonging to the family Mycoplasmataceae. As the name implies, Ureaplasma is urease positive.

<span class="mw-page-title-main">Leptospiraceae</span> Family of bacteria

The Leptospiraceae are a family of spirochete bacteria. It includes the genus Leptospira which contains some pathogenic species.

The Coriobacteriales are an order of Actinomycetota.

<i>Chlamydophila</i> Genus of bacteria

Chlamydophila is a controversial bacterial genus belonging to the family Chlamydiaceae.

<span class="mw-page-title-main">Chlamydiaceae</span> Family of bacteria

The Chlamydiaceae are a family of gram-negative bacteria that belongs to the phylum Chlamydiota, order Chlamydiales. Chlamydiaceae species express the family-specific lipopolysaccharide epitope αKdo-(2→8)-αKdo-(2→4)-αKdo. Chlamydiaceae ribosomal RNA genes all have at least 90% DNA sequence identity. Chlamydiaceae species have varying inclusion morphology, varying extrachromosomal plasmid content, and varying sulfadiazine resistance.

Chlamydia muridarum is an intracellular bacterial species that at one time belonged to Chlamydia trachomatis. However, C. trachomatis naturally only infects humans and C. muridarum naturally infects only members of the family Muridae.

Chlamydia suis is a member of the genus Chlamydia. C. suis has only been isolated from swine, in which it may be endemic. Glycogen has been detected in Chlamydia suis inclusions in infected swine tissues and in cell culture. C. suis is associated with conjunctivitis, enteritis and pneumonia in swine.

Parachlamydiaceae is a family of bacteria in the order Chlamydiales. Species in this family have a Chlamydia–like cycle of replication and their ribosomal RNA genes are 80–90% identical to ribosomal genes in the Chlamydiaceae. The Parachlamydiaceae naturally infect amoebae and can be grown in cultured Vero cells. The Parachlamydiaceae are not recognized by monoclonal antibodies that detect Chlamydiaceae lipopolysaccharide.

Simkaniaceae is a family of bacteria in the order Chlamydiales, class Chlamydiia, phylum Chlamydiota, domain Bacteria. Species in this family have a chlamydia-like cycle of replication and their ribosomal RNA genes are 80–90% identical to ribosomal genes in the Chlamydiaceae. The Simkaniaceae are not recognized by monoclonal antibodies that are specific for Chlamydiaceae lipopolysaccharide. The family Simkaniaceae currently includes two genera: Simkania and Fritschea. The type species is Simkania negevensis, and its natural host is not known. It is readily grown in monolayers of eukaryotic Vero cells. Serological evidence and PCR indicate that S. negevensis is widespread among humans.

Chlamydia caviae is a bacterium that can be recovered from the conjunctiva of Guinea pigs suffering from ocular inflammation and eye discharge. It is also possible to infect the genital tract of Guinea pigs with C. caviae and elicit a disease that is very similar to human Chlamydia trachomatis infection. C. caviae infects primarily the mucosal epithelium and is not invasive.

<span class="mw-page-title-main">Desulfurococcales</span> Order of archaea

The Desulfurococcales are an order of the Thermoprotei, part of the kingdom Archaea. The order encompasses some genera which are all thermophilic, autotrophs which utilise chemical energy, typically by reducing sulfur compounds using hydrogen.

Methanobacteriaceae are a family of archaeans in the order Methanobacteriales.

<span class="mw-page-title-main">Spirochaetaceae</span> Family of bacteria

The Spirochaetaceae are a family of spirochete bacteria. Some species within this family are known to causes syphilis, Lyme disease, relapsing fever, and other illnesses.

<i>Chlamydia</i> (genus) Genus of bacteria

Chlamydia is a genus of pathogenic Gram-negative bacteria that are obligate intracellular parasites. Chlamydia infections are the most common bacterial sexually transmitted diseases in humans and are the leading cause of infectious blindness worldwide.

Halomicrobium is a genus of the Haloarculaceae.

Armatimonadota is a phylum of gram-negative bacteria.

Simkania, is a genus of bacteria belonging to the Chlamydiota. The only species of this genus is Simkania negevensis.

Phycisphaeraceae is a family of bacteria.

Planctomycetaceae is a family of bacteria.

References

  1. "The LTP" . Retrieved 20 November 2023.
  2. "LTP_all tree in newick format" . Retrieved 20 November 2023.
  3. "LTP_08_2023 Release Notes" (PDF). Retrieved 20 November 2023.
  4. "GTDB release 08-RS214". Genome Taxonomy Database . Retrieved 10 May 2023.
  5. "bac120_r214.sp_label". Genome Taxonomy Database . Retrieved 10 May 2023.
  6. "Taxon History". Genome Taxonomy Database . Retrieved 10 May 2023.
  7. J.P. Euzéby. "Chlamydiota". List of Prokaryotic names with Standing in Nomenclature (LPSN). Retrieved 2022-09-09.
  8. Sayers; et al. "Chlamydiae". National Center for Biotechnology Information (NCBI) taxonomy database. Retrieved 2022-09-09.