The Ecological Controls on the Prevalence of Candidate Division TM7 in Polar Regions
The candidate division TM7 is ubiquitous and yet uncultured phylum of the Bacteria that encompasses a commonly environmental associated clade, TM7-1, and a ‘host-associated’ clade, TM7-3. However, as members of the TM7 phylum have not been cultured, little is known about what differs between these t...
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ftdoajarticles:oai:doaj.org/article:4a8bdc9545bb4a5093e628afaa8fa181 2023-05-15T14:00:47+02:00 The Ecological Controls on the Prevalence of Candidate Division TM7 in Polar Regions Tristrom eWinsley Ian eSnape John eMcKinlay Jonny eStark Josie evan Dorst Mukan eJi Belinda eFerrari Steven eSiciliano 2014-07-01T00:00:00Z https://doi.org/10.3389/fmicb.2014.00345 https://doaj.org/article/4a8bdc9545bb4a5093e628afaa8fa181 EN eng Frontiers Media S.A. http://journal.frontiersin.org/Journal/10.3389/fmicb.2014.00345/full https://doaj.org/toc/1664-302X 1664-302X doi:10.3389/fmicb.2014.00345 https://doaj.org/article/4a8bdc9545bb4a5093e628afaa8fa181 Frontiers in Microbiology, Vol 5 (2014) Siderophores Arctic Antarctic soil bacteria candidate pylum TM7 bacterial culturing Microbiology QR1-502 article 2014 ftdoajarticles https://doi.org/10.3389/fmicb.2014.00345 2022-12-31T05:10:46Z The candidate division TM7 is ubiquitous and yet uncultured phylum of the Bacteria that encompasses a commonly environmental associated clade, TM7-1, and a ‘host-associated’ clade, TM7-3. However, as members of the TM7 phylum have not been cultured, little is known about what differs between these two clades. We hypothesized that these clades would have different environmental niches. To test this, we used a large-scale global soil dataset, encompassing 223 soil samples, their environmental parameters and associated bacterial 16S rRNA gene sequence data. We correlated chemical, physical and biological parameters of each soil with the relative abundance of the two major classes of the phylum to deduce factors that influence the groups’ seemingly ubiquitous nature. The two classes of the phylum (TM7-1 and TM7-3) were indeed distinct from each other in their habitat requirements. A key determinant of each class’ prevalence appears to be the pH of the soil. The class TM7-1 displays a facultative anaerobic nature with correlations to more acidic soils with total iron, silicon, titanium and copper indicating a potential for siderophore production. However, the TM7-3 class shows a more classical oligotrophic, heterotroph nature with a preference for more alkaline soils, and a probable pathogenic role with correlations to extractable iron, sodium and phosphate. In addition, the TM7-3 was abundant in diesel contaminated soils highlighting a resilient nature along with a possible carbon source. In addition to this both classes had unique co-occurrence relationships with other bacterial phyla. In particular, both groups had opposing correlations to the Gemmatimonadetes phylum, with the TM7-3 class seemingly being outcompeted by this phylum to result in a negative correlation. These ecological controls allow the characteristics of a TM7 phylum preferred niche to be defined and give insight into possible avenues for cultivation of this previously uncultured group. Article in Journal/Newspaper Antarc* Antarctic Arctic Directory of Open Access Journals: DOAJ Articles Antarctic Arctic Frontiers in Microbiology 5 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Siderophores Arctic Antarctic soil bacteria candidate pylum TM7 bacterial culturing Microbiology QR1-502 |
spellingShingle |
Siderophores Arctic Antarctic soil bacteria candidate pylum TM7 bacterial culturing Microbiology QR1-502 Tristrom eWinsley Ian eSnape John eMcKinlay Jonny eStark Josie evan Dorst Mukan eJi Belinda eFerrari Steven eSiciliano The Ecological Controls on the Prevalence of Candidate Division TM7 in Polar Regions |
topic_facet |
Siderophores Arctic Antarctic soil bacteria candidate pylum TM7 bacterial culturing Microbiology QR1-502 |
description |
The candidate division TM7 is ubiquitous and yet uncultured phylum of the Bacteria that encompasses a commonly environmental associated clade, TM7-1, and a ‘host-associated’ clade, TM7-3. However, as members of the TM7 phylum have not been cultured, little is known about what differs between these two clades. We hypothesized that these clades would have different environmental niches. To test this, we used a large-scale global soil dataset, encompassing 223 soil samples, their environmental parameters and associated bacterial 16S rRNA gene sequence data. We correlated chemical, physical and biological parameters of each soil with the relative abundance of the two major classes of the phylum to deduce factors that influence the groups’ seemingly ubiquitous nature. The two classes of the phylum (TM7-1 and TM7-3) were indeed distinct from each other in their habitat requirements. A key determinant of each class’ prevalence appears to be the pH of the soil. The class TM7-1 displays a facultative anaerobic nature with correlations to more acidic soils with total iron, silicon, titanium and copper indicating a potential for siderophore production. However, the TM7-3 class shows a more classical oligotrophic, heterotroph nature with a preference for more alkaline soils, and a probable pathogenic role with correlations to extractable iron, sodium and phosphate. In addition, the TM7-3 was abundant in diesel contaminated soils highlighting a resilient nature along with a possible carbon source. In addition to this both classes had unique co-occurrence relationships with other bacterial phyla. In particular, both groups had opposing correlations to the Gemmatimonadetes phylum, with the TM7-3 class seemingly being outcompeted by this phylum to result in a negative correlation. These ecological controls allow the characteristics of a TM7 phylum preferred niche to be defined and give insight into possible avenues for cultivation of this previously uncultured group. |
format |
Article in Journal/Newspaper |
author |
Tristrom eWinsley Ian eSnape John eMcKinlay Jonny eStark Josie evan Dorst Mukan eJi Belinda eFerrari Steven eSiciliano |
author_facet |
Tristrom eWinsley Ian eSnape John eMcKinlay Jonny eStark Josie evan Dorst Mukan eJi Belinda eFerrari Steven eSiciliano |
author_sort |
Tristrom eWinsley |
title |
The Ecological Controls on the Prevalence of Candidate Division TM7 in Polar Regions |
title_short |
The Ecological Controls on the Prevalence of Candidate Division TM7 in Polar Regions |
title_full |
The Ecological Controls on the Prevalence of Candidate Division TM7 in Polar Regions |
title_fullStr |
The Ecological Controls on the Prevalence of Candidate Division TM7 in Polar Regions |
title_full_unstemmed |
The Ecological Controls on the Prevalence of Candidate Division TM7 in Polar Regions |
title_sort |
ecological controls on the prevalence of candidate division tm7 in polar regions |
publisher |
Frontiers Media S.A. |
publishDate |
2014 |
url |
https://doi.org/10.3389/fmicb.2014.00345 https://doaj.org/article/4a8bdc9545bb4a5093e628afaa8fa181 |
geographic |
Antarctic Arctic |
geographic_facet |
Antarctic Arctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
Frontiers in Microbiology, Vol 5 (2014) |
op_relation |
http://journal.frontiersin.org/Journal/10.3389/fmicb.2014.00345/full https://doaj.org/toc/1664-302X 1664-302X doi:10.3389/fmicb.2014.00345 https://doaj.org/article/4a8bdc9545bb4a5093e628afaa8fa181 |
op_doi |
https://doi.org/10.3389/fmicb.2014.00345 |
container_title |
Frontiers in Microbiology |
container_volume |
5 |
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1766270128723329024 |