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Bacterial Phylum Spirochaetes

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Spirochetes, unique bacteria in the phylum Spirochaetes, are gram-negative, motile, tightly coiled, slender, and flexible. They inhabit aquatic sediments and animals, with some causing diseases like syphilis. Spirochetes are classified into eight genera based on habitat, pathogenicity, phylogeny, and characteristics.Their distinctive motility arises from endoflagella, located within the cell’s periplasm. These endoflagella anchor at the cell poles and extend along the cell length, encased...
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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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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
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Related Experiment Video

Updated: Dec 15, 2025

Author Spotlight: Leptospira DNA Detection in Water for Environmental Analysis and Disease Surveillance
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Leptospira and Leptospirosis.

Mathieu Picardeau1

  • 1Institut Pasteur, Unité Biologie des Spirochètes, Paris, France. mathieu.picardeau@pasteur.fr.

Methods in Molecular Biology (Clifton, N.J.)
|July 8, 2020
PubMed
Summary

Leptospira bacteria cause leptospirosis, a zoonotic disease. Recent genomic studies have significantly expanded the known species within the Leptospira genus, impacting our understanding of these unique environmental bacteria.

Area of Science:

  • Microbiology
  • Bacteriology
  • Genomics

Background:

  • Leptospira spp. are unique bacteria found globally.
  • Pathogenic Leptospira cause leptospirosis, an emerging zoonotic disease.
  • Transmission occurs via environmental contamination with infected animal urine.

Purpose of the Study:

  • To summarize recent taxonomic revisions in Leptospira.
  • To highlight the impact of whole-genome sequencing on species identification.

Main Methods:

  • Whole-genome sequencing analysis.
  • Phylogenetic analysis of Leptospira species.
  • Review of recent taxonomic literature.

Main Results:

  • Leptospira taxonomy has been significantly revised.
Keywords:
GenomePathogenesisTaxonomyVirulence factors

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  • The number of recognized Leptospira species has considerably increased.
  • Genomic data provides a robust basis for species delineation.
  • Conclusions:

    • Recent genomic studies have reshaped Leptospira taxonomy.
    • Expanded species diversity requires updated understanding of leptospirosis epidemiology.
    • Whole-genome sequencing is crucial for accurate bacterial classification.