Name: gut and environment bacteria in bacteroidota
Uploaded: 2025-06-12T09:22:13.000Z
Duration: 1 min 26 s
Channel: JoVE

Gromada Bacteroidota obejmuje pałeczki Gram-ujemne sklasyfikowane w czterech rzędach - Bacteroidales, Cytophagales, Flavobacteriales i Sphingobacteriales. Rząd Bacteroidales obejmuje przede wszystkim obowiązkowo beztlenowe, fermentacyjne bakterie. Warto zauważyć, że rodzaj Bacteroides stanowi znaczną część biomasy mikrobiologicznej w jelicie grubym człowieka. Rząd cytofagów obejmuje przede wszystkim obowiązkowe tlenowce, które są zazwyczaj długimi, smukłymi prętami, często ze spiczastymi końcami. Cytophaga to kluczowy rodzaj Cytophagales, zdolny do degradacji celulozy, agaru i chityny. Rząd Flavobacteriales obejmuje szeroko rozpowszechniony rodzaj Flavobacterium oraz rodzaje Polaribacter i Psychroflexus,, które rozwijają się w wodach polarnych i lodzie morskim. Rząd Sphingobacteriales to zróżnicowana grupa powszechnie występująca w środowisku glebowym i słodkowodnym. Sphingobacterium jest reprezentatywnym rodzajem. Gatunki Sphingobacterium to nieruchome pręciki bez wici. Ponadto wiele gatunków z rodzaju Sphingobacterium wydaje się być pigmentowanych, ponieważ posiadają karotenoidy w swoich ścianach komórkowych.

typ bakterii: bacteroidetes

Bacterial Phylum Bacteroidota

Typ Bacteroidota obejmuje ponad 700 gatunk&#243;w sklasyfikowanych w czterech g&#322;&#243;wnych rz&#281;dach: Bacteroidales, Cytophagales, Flavobacteriales oraz Sphingobacteriales. Te gram-ujemne, niewytwarzaj&#261;ce przetrwalnik&#243;w pa&#322;eczki wykazuj&#261; zdolno&#347;ci sacharolityczne i mog&#261; by&#263; tlenowe lub fermentuj&#261;ce, obejmuj&#261;c bezwzgl&#281;dne tlenowce, fakultatywne tlenowce i bezwzgl&#281;dne beztlenowce. Wiele gatunk&#243;w wykazuje ruch &#347;lizgowy, cho&#263; niekt&#243;re s&#261; nieruchliwe lub poruszaj&#261; si&#281; za pomoc&#261; rz&#281;sek. Rodzaj Bacteroides jest dobrze poznany ze wzgl&#281;du na istotn&#261; rol&#281; w mikrobiocie jelitowej cz&#322;owieka.
Bacteroidales
Bacteroidales obejmuje bezwzgl&#281;dnie beztlenowe, fermentuj&#261;ce bakterie. Rodzaj Bacteroides metabolizuje cukry lub bia&#322;ka, wytwarzaj&#261;c octan i bursztynian. Bakterie te dominuj&#261; w jelicie grubym cz&#322;owieka, ale mog&#261; sta&#263; si&#281; oportunistycznymi patogenami, powoduj&#261;cymi infekcje, takie jak bakteriemia. Bacteroides thetaiotaomicron specjalizuje si&#281; w degradacji polisacharyd&#243;w, koduj&#261;c liczne geny metabolizmu w&#281;glowodan&#243;w nieobecne w ludzkim genomie. Unikaln&#261; cech&#261; Bacteroides jest zdolno&#347;&#263; do syntezy sfingolipid&#243;w, klasy lipid&#243;w rzadko spotykanych u bakterii.
Cytophagales
Cytophagales sk&#322;ada si&#281; g&#322;&#243;wnie z bezwzgl&#281;dnych tlenowc&#243;w rozk&#322;adaj&#261;cych z&#322;o&#380;one polisacharydy. Te d&#322;ugie, smuk&#322;e pa&#322;eczki wykazuj&#261; ruch &#347;lizgowy i przyczyniaj&#261; si&#281; do rozk&#322;adu celulozy w glebie i wodach s&#322;odkich. Cytophaga hutchinsonii nie posiada procesywnych celulaz, polegaj&#261;c na bezpo&#347;rednim kontakcie z w&#322;&#243;knami celulozowymi podczas ich degradacji. Gatunki Cytophaga rozk&#322;adaj&#261; celuloz&#281;, agar i chityn&#281;, a niekt&#243;re, jak Cytophaga columnaris i Cytophaga psychrophila, s&#261; patogenami ryb, powoduj&#261;cymi uszkodzenia tkanek w &#347;rodowiskach akwakultury.
Flavobacteriales i Sphingobacteriales
Rz&#281;dy Flavobacteriales i Sphingobacteriales obejmuj&#261; organizmy chemoorganotroficzne, tlenowe i fakultatywnie tlenowe. Niekt&#243;re ich przedstawiciele to gram-ujemne pa&#322;eczki zdolne do rozk&#322;adu cukr&#243;w, cz&#281;sto poruszaj&#261;ce si&#281; ruchem &#347;lizgowym i degraduj&#261;ce z&#322;o&#380;one polisacharydy w r&#243;&#380;nych &#347;rodowiskach. Gatunki z rodzaju Flavobacterium, nale&#380;&#261;ce do rz&#281;du Flavobacteriales, wyst&#281;puj&#261; w &#347;rodowiskach wodnych i w zak&#322;adach przetw&#243;rstwa spo&#380;ywczego. Niekt&#243;re z nich, jak Flavobacterium meningosepticum, s&#261; chorobotw&#243;rcze. Rodzaje przystosowane do zimna, takie jak Polaribacter i Psychroflexus, rozwijaj&#261; si&#281; w wodach polarnych i lodzie morskim.
Sphingobacterium sp. nale&#380;y do rz&#281;du Sphingobacteriales. Jest to rodzaj Gram-ujemnych, pa&#322;eczkowatych bakterii nie tworz&#261;cych przetrwalnik&#243;w, kt&#243;re zazwyczaj wyst&#281;puj&#261; w glebie, wodzie i &#347;rodowiskach klinicznych. Bakterie te s&#261; znane ze swojej zdolno&#347;ci do rozk&#322;adu z&#322;o&#380;onych zwi&#261;zk&#243;w organicznych i odgrywaj&#261; rol&#281; w bioremediacji. Wiele gatunk&#243;w wytwarza &#380;&#243;&#322;te do pomara&#324;czowych pigment&#243;w karotenoidowych, co nadaje im charakterystyczne zabarwienie.
Bacteroidota odgrywaj&#261; kluczow&#261; rol&#281; w obiegu sk&#322;adnik&#243;w od&#380;ywczych i rozk&#322;adzie materii organicznej. Cho&#263; wi&#281;kszo&#347;&#263; z nich jest korzystna, niekt&#243;re, takie jak Bacteroides i Cytophaga, mog&#261; dzia&#322;a&#263; jako oportunistyczne patogeny. Ich r&#243;&#380;norodno&#347;&#263; metaboliczna czyni je istotnymi dla zdrowia cz&#322;owieka, mikrobiologii oraz zastosowa&#324; przemys&#322;owych.

Typ bakterii: Bacteroidetes

Typ Bacteroidota obejmuje ponad 700 gatunk&#243;w sklasyfikowanych w czterech g&#322;&#243;wnych rz&#281;dach: Bacteroidales, Cytophagales, ...

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Microbial Diversity

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gut and environment bacteria in bacteroidota

Bacteroidota is a bacterial phylum with more than 700 species. It includes four main orders: Bacteroidales, Cytophagales, Flavobacteriales, and Sphingobacteriales. These bacteria are gram-negative, do not form spores, and are usually rod-shaped. They can be aerobic or fermentative, and some use gliding motility while others are nonmotile or move with flagella.

Bacteroidales includes obligately anaerobic, fermentative bacteria. The genus Bacteroides is especially important because it lives in the human gut microbiota. These bacteria break down sugars or proteins and produce acetate and succinate. They are common in the large intestine, but some can act as opportunistic pathogens and cause infections such as bacteremia. Bacteroides thetaiotaomicron is known for breaking down polysaccharides, and it carries many carbohydrate metabolism genes that humans do not have. A rare trait in this genus is the ability to make sphingolipids, a lipid type that is uncommon in bacteria.

Cytophagales mainly includes obligate aerobes that degrade complex polysaccharides. These bacteria are long and slender, and many show gliding motility. They help break down cellulose in soil and freshwater. Cytophaga hutchinsonii does not use processive cellulases and instead depends on direct contact with cellulose fibers. Other Cytophaga species digest cellulose, agar, and chitin. Some, including Cytophaga columnaris and Cytophaga psychrophila, are fish pathogens that damage tissues in aquaculture.

Flavobacteriales and Sphingobacteriales include aerobic and facultatively aerobic chemoorganotrophs. A chemoorganotroph uses organic compounds for energy and growth. Many of these bacteria are gram-negative rods, are saccharolytic, and often glide while breaking down complex polysaccharides in different habitats. Flavobacterium species live in aquatic and food-processing environments, and some, such as Flavobacterium meningosepticum, can be pathogenic. Cold-adapted genera like Polaribacter and Psychroflexus thrive in polar waters and sea ice. Sphingobacterium species are found in soil, water, and clinical settings. They can break down complex organic compounds, support bioremediation, and often produce yellow to orange carotenoid pigments.

Bacteroidota play important roles in nutrient cycling and the breakdown of organic matter. Most are helpful in their environments, but some Bacteroides and Cytophaga species can cause disease as opportunistic pathogens. Their wide range of metabolism makes them important in human health, microbiology, and industrial uses.

Gut and Environment Bacteria in Bacteroidota

gut-and-environment-bacteria-in-bacteroidota

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diversity of protists iii

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diversity of protists iv

Amoebozoa: Movement and Life Cycles

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key terms and concepts

Explore Bacteroidota bacteria in the gut, soil, water, and sea ice. Learn how these gram-negative microbes digest polysaccharides and affect health.

Gut and Environment Bacteria in Bacteroidota | JoVE K12

JoVE Core Microbiology provides an engaging introduction to the microbial world and its influence on health, industry, and the environment. This comprehensive collection covers key concepts such as microbial structure, metabolism, genetics, and ecology. It introduces essential laboratory techniques and microscopy methods through visually engaging animations. Corresponding scientist-in-action videos bridge classroom concepts with real-world research and applications.

microbiology

Gut and Environment Bacteria in Bacteroidota

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