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Related Concept Videos

Bacterial Phylum Firmicutes01:27

Bacterial Phylum Firmicutes

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Firmicutes is a diverse phylum of Gram-positive bacteria characterized by a low GC content in their genomes. This phylum includes organisms with monoderm or diderm cell envelopes, highlighting a complex evolutionary history. Firmicutes comprises several major orders, including Lactobacillales, Clostridiales, and Bacillales, which exhibit remarkable diversity in their morphology, metabolism, and ecological roles.The order Lactobacillales includes lactic acid bacteria, which are fermentative...
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Bacterial Phylum Planctomycetes01:26

Bacterial Phylum Planctomycetes

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Planctomycetes are a group of morphologically distinct bacteria predominantly classified into two orders: Planctomycetales and Brocadiales. These gram-negative bacteria exhibit unique features, including division by budding and the presence of stalks or appendages. Their cells are often found in rosette arrangements, and they are notable for possessing an S-layer in their cell envelope, which is relatively uncommon among bacteria. Additionally, Planctomycetes frequently exhibit intracellular...
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Bacterial Phylum Tenericutes01:24

Bacterial Phylum Tenericutes

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The phylum Tenericutes, which includes the single class Mollicutes, comprises bacteria that lack cell walls. The term "Mollicutes" derives from the Latin word mollis, meaning "soft." These organisms are among the smallest known and are commonly referred to as mycoplasmas due to the prominence of the genus Mycoplasma, which includes well-known human pathogens. Despite their inability to stain gram-positively (a result of their lack of cell walls), mycoplasmas are phylogenetically related to the...
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Bacterial Phylum Bacteroidota01:26

Bacterial Phylum Bacteroidota

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The phylum Bacteroidota includes over 700 species classified into four primary orders: Bacteroidales, Cytophagales, Flavobacteriales, and Sphingobacteriales. These gram-negative, non-sporulating rods exhibit saccharolytic capabilities and can be aerobic or fermentative, encompassing obligate aerobes, facultative aerobes, and obligate anaerobes. Many species display gliding motility, though some are nonmotile or use flagella. The genus Bacteroides is well-studied due to its significant role in...
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Bacterial Phylum Actinobacteria01:30

Bacterial Phylum Actinobacteria

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Coryneform bacteria are gram-positive, aerobic, nonmotile rods that exhibit irregular, club-shaped, or V-shaped arrangements. Their V-shape results from snapping division, where the inner cell wall layer forms the cross-wall, while the outer layer remains intact until it ruptures on one side, causing the daughter cells to bend away.The primary genera are Corynebacterium and Arthrobacter. Corynebacterium includes diverse species, ranging from saprophytes to pathogens like Corynebacterium...
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Bacterial Phylum Proteobacteria01:26

Bacterial Phylum Proteobacteria

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Proteobacteria, one of the largest and most diverse bacterial phyla, encompasses a wide range of Gram-negative bacteria distinguished by their outer membrane composed of lipopolysaccharides. These microorganisms exhibit various metabolic capabilities, including phototrophy, chemolithotrophy, and heterotrophy, and thrive in diverse environments from soil to aquatic systems and host-associated niches. The phylum is divided into six classes: Alphaproteobacteria, Betaproteobacteria,...
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New globally distributed bacterial phyla within the FCB superphylum.

Xianzhe Gong1,2, Álvaro Rodríguez Del Río3, Le Xu4

  • 1Institute of Marine Science and Technology, Shandong University, Qingdao, Shandong, 266237, China. xianzhe.gong@gmail.com.

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Scientists discovered five novel bacterial phyla in ocean sediments. These microbes are globally distributed and play key roles in nutrient cycling and biogeochemical processes.

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Area of Science:

  • Microbiology
  • Oceanography
  • Genomics

Background:

  • Marine microbes are vital for global nutrient and carbon cycling.
  • Understanding ocean floor microbial diversity and function remains limited.

Purpose of the Study:

  • To identify and characterize novel bacterial phyla in marine sediments.
  • To explore the ecological roles and metabolic capabilities of these newly discovered microbes.

Main Methods:

  • Phylogenomic analysis of thousands of metagenome-assembled genomes (MAGs).
  • Comparison of rRNA genes with public databases.
  • Genomic analysis of metabolic pathways and novel protein families.

Main Results:

  • Identification of 55 MAGs belonging to 4 novel phyla (Blakebacterota, Orphanbacterota, Arandabacterota, Joyebacterota) and one proposed phylum (AABM5-125-24) within the FCB superphylum.
  • These novel phyla are globally distributed across marine, freshwater, and terrestrial environments.
  • Genomic data indicate roles in polysaccharide/protein degradation, sulfur/nitrogen respiration, and possess numerous uncharacterized protein families.

Conclusions:

  • The discovery of these novel bacterial phyla expands our knowledge of microbial diversity in marine sediments.
  • These organisms contribute significantly to sedimentary biogeochemistry.
  • Novel gene families identified may represent new metabolic functions crucial for ocean processes.