Chaetomium subspirale

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Chaetomium subspirale
Chaetomium subspirale.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Sordariomycetes
Order: Sordariales
Family: Chaetomiaceae
Genus: Chaetomium
Species:
C. subspirale
Binomial name
Chaetomium subspirale
A.H. Chivers, (1912)
Synonyms
  • Humicola subspiralis(Chivers) X. Wei Wang & Houbraken (2019)

Chaetomium subspirale is a fungus from the phylum Ascomycota. It was described by A. H. Chivers in 1912 in America. The species has sexual fruiting bodies that are ornamented with characteristic, coiled hairs giving it a wooly appearance. C. subspirale colonies are brown, which the characteristic hairs are also responsible for. It is commonly found in various soil and dung samples. C. subspirale produces the mycotoxin, oxaspirodion, which inhibits inducible TNF-a expression and inhibits the activation of the transcription factor NF-kappaB.

Contents

History and taxonomy

Professor A.H. Chivers recognized Chaetomium subspirale in 1912 in America through the course of his work on the genus Chaetomium. Through the examination of many successive generations and the cultivation of species from different sources on various media, Chivers was able to examine a large series of specimens from various herbaria and exsiccati. [1] This examination allowed Chivers to provide his preliminary diagnosis of C. subspirale along with a number of other species within Chaetomium. [1] X.W. Wang conducted a phylogenetic analysis of C. subspirale. Wang's findings have led her to propose the transfer of C. subspirale to the genus Humicola as H. subspiralis. [2] MycoBank lists this new bionomial name as a synonym for C. subspirale.

Growth and morphology

Chaetomium subspirale has been recognized for having a daily growth rate of 2.5-3.5 µm for colonies. [3] Canadian mycologist Dr. Adrian Carter observed a moderately fast growth rate of 3.0-3.5 mm/day in Czapek’s medium and Leonian’s medium and a growth rate of 3.0-4.0 mm/day for the tomato paste and oatmeal-based medium, Weitzman & Silvia-Hunter’s agar. [4]

Characteristic hair help to distinguish C. subspirale. The lateral hairs are short, straight and dark, with tightly coiled tips. [1] The terminal slender is initially delicately coiled in a spiral and then elongated and twisted later. [1] This gives the appearance of wool threads to the fungi. In comparison, the ascogonial coil are short, stipitate and irregularly coiled. [4] Colonies of C. subspirale have an appearance of brown due to the erect, verrucose mycelial hairs. [3] The ascomata, which are usually 200-280 µm, take 14 days to mature. [3] In reflected light, they give a grey appearance with a brown wall of flattened, angular (7-12 µm) cells. [3] With a brown and distinctly septate broad base of 2.5-3.5 µm, [3] C. subspirale also has well-developed rhizoids, which can be up to 400 µm in length. [4] C. subspirale’s barrel shaped perithecia help to distinguish it from other species of Chaetomium. [5]

Similar taxa

Chaetomium subspirale is similar to various other species in the genus Chaetomium. However it is possible to distinguish between the species due to differentiating characteristics. A few species that C. subspirale is similar to include C. homopilatum, C. ampullare, C. sphaerale, C. pulchellum, and C. semispirale. C. subspirale has smaller ascomata with a conical beak and larger ascospores than C. homopilatum. [3] C. ampullare and C. sphaerale are easily distinguished from C. subspirale due to the larger ascospores and ascomata of C. subspirale. [3] C. pluchellum morphologically resembles C. subspirale, however, C. pluchellum has more slender terminal perithecial hairs. [4] Different ascospore sizes and colony morphology on Leonian’s and Czapek’s media help to differentiate C. subspirale from C. semispirale. [4]

Habitat

Chivers states that C. subspirale is commonly found in various soil and dung samples. [1] In terms of soil, C. subspirale has been found in cultures of various substrata from New England frequently. [1] For dung samples, C. subspirale appears in various locations and various types of dung samples. In Ontario, Canada, it has been observed on paper and rabbit, cow and deer dung. [5] In the US, C. subspirale has appeared on the dung of sheep, dog, good, deer and rabbit. [5] In South America, it has been reported from chicken dung, while in the Isles of Shoals, it has been recorded to appear rat dung. [5] It is also found on dung in The Netherlands and South America. [1] Chivers identified C. subspirale on antelope dung in Kenya as well. [6]

Industrial use

Significant research has revealed a large number of natural products derived from fungi that have potential for anti-inflammatory and anticancer properties for human cancer cells. [7] Some compounds have even been tested in mouse models of human cancer to demonstrate their therapeutic benefits. Oxaspiradion is one of the fungi-derived natural products with an ability to aid in anti-inflammatory and anticancer measures. Isolated from C. subspirale, oxaspirodion inhibits inducible TNF-an expression and inhibits the activation of the transcription factor NF-kappaB. [7]

Inflammatory diseases, such as, septic shock, rheumatoid arthritis and Crohn’s disease, involve TNF-a as the main pro-inflammatory cytokine. [8] Some new therapeutic approaches target the regulation of TNF-an expression. Rether et al. used a cell-based screening system to identify a low molecular weight compounds inhibitory to the induction of TNF-an expression from a large panel of mycelial cultures of basidiomycetes, ascomycetes. Rether et al. found that oxaspirodion derived from C. subspirale inhibited the expression of a TNF-a-driven luciferase reporter gene. [8] The NF-kappaB pathway is considered a prototypical proinflammatory signaling pathway. Oxaspirodion inhibits the activation of the transcription factor NF-kappaB, leading to interest in its potential as an anticancer therapeutic. [7]

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<i>Chaetomium</i> Genus of fungi

Chaetomium is a genus of fungi in the Chaetomiaceae family. It is a dematiaceous (dark-walled) mold normally found in soil, air, cellulose and plant debris. According to the Dictionary of the Fungi, there are about 95 species in the widespread genus.

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Tumor necrosis factor, alpha-induced protein 3 or A20 is a protein that in humans is encoded by the TNFAIP3 gene.

Farrowia is a genus of fungi within the Chaetomiaceae family.

Polytolypa is a monotypic genus of fungus containing the single species Polytolypa hystricis. First classified in the Onygenaceae family, as of 2008 it is considered to be in the Ajellomycetaceae, although there is still uncertainty as to its phylogenetic relationships with other similar genera. This species is only known from a single specimen derived in the laboratory from a specimen of dung of the North American porcupine, Erethizon dorsatum, collected in Ontario, Canada. Polytolypa hystricis contains bioactive compounds that have antifungal activity.

The Loramycetaceae are a family of fungi in the Ascomycota, class Leotiomycetes. This is a monotypic taxon, containing the single genus Loramyces; the genus contains two aquatic species, L. juncicola, named by American mycologist William H. Weston in 1929, and L. macrosporus, first described by C.T. Ingold and B. Chapman in 1952.

Chaetomium cupreum is a fungus in the family Chaetomiaceae. It is able to decay in manufactured cellulosic materials, and is known to antagonize a wide range of soil microorganisms. This species is component of the biocontrol agent, Ketomium, a commercial biofungicide. It has also been investigated for use in the production of natural dyes. Chaetomium cupreum is mesophilic and known to occur in harsh environments and can rapidly colonize organic substrates in soil. Laboratory cultures of C. cupreum can be propagated on a range of common growth media including potato dextrose at ambient or higher than ambient temperature producing cottony white colonies with a reddish reverse.

<i>Aphanoascus fulvescens</i> Species of fungus

Aphanoascus fulvescens is a mould fungus that behaves as a keratinophilic saprotroph and belongs to the Ascomycota. It is readily isolated from soil and dung containing keratin-rich tissues that have been separated from their animal hosts. This organism, distributed worldwide, is most commonly found in areas of temperate climate, in keeping with its optimal growth temperature of 28 °C (82 °F). While A. fulvescens is recognized as a geophilic fungal species, it is also a facultative opportunistic pathogen. Although it is not a dermatophyte, A. fulvescens has occasionally been shown to cause onychomycosis infections in humans. Its recognition in the laboratory is clinically important for correct diagnosis and treatment of human dermal infections.

<i>Chaetomium globosum</i> Species of fungus

Chaetomium globosum is a well-known mesophilic member of the mold family Chaetomiaceae. It is a saprophytic fungus that primarily resides on plants, soil, straw, and dung. Endophytic C. globosum assists in cellulose decomposition of plant cells. They are found in habitats ranging from forest plants to mountain soils across various biomes. C. globosum colonies can also be found indoors and on wooden products.

Thielavia subthermophila is a ubiquitous, filamentous fungus that is a member of the phylum Ascomycota and order Sordariales. Known to be found on plants of arid environments, it is an endophyte with thermophilic properties, and possesses dense, pigmented mycelium. Thielavia subthermophila has rarely been identified as a human pathogen, with a small number of clinical cases including ocular and brain infections. For treatment, antifungal drugs such as amphotericin B have been used topically or intravenously, depending upon the condition.

Chaetomium atrobrunneum is a darkly pigmented mould affiliated with the fungal division, Ascomycota. This species is predominantly saprotrophic, although it has been known to infect animals including humans, showing a proclivity for the tissues of the central nervous system. Chaetomium atrobrunneum was described in 1949 from a mouldy military mattress cover obtained from the island of Guadalcanal.

Botryotrichum murorum is a common soil and indoor fungus resembling members of the genus Chaetomium. The fungus has no known asexual state, and unlike many related fungi, is intolerant of high heat exhibiting limited growth when incubated at temperatures over 35 °C. In rare cases, the fungus is an opportunistic pathogen of marine animals and humans causing cutaneous and subcutaneous infection.

<i>Chaetomium elatum</i> Species of fungus

Chaetomium elatum is a very common and widely distributed saprotrophic fungus of the Chaetomiaceae family of molds which has been found to grow on many different substances all over the world. It was first established by Gustav Kunze after he observed it growing on dead leaves. Its defining features that distinguish it from other Chaetomium species are its extremely coarse terminal hairs and the lemon-shaped morphology of its ascospores. It produces many metabolites with potential biotechnology uses including one with promise against the rice blast disease fungus, Magnaporthe grisea. It shows very little pathogenic ability causing confirmed disease in only a few plant species.

Collariella bostrychodes is a fungal decomposer of lignin and carbohydrate in the family Chaetomiaceae commonly found in soil and dung. The fungus is distinguished by a darkened collar-like ostiole around the ostiolar pore, giving the fungus its name. The fungus is highly variable in shape and form, giving raise to the belief that there are two subclades in the species. The ascospores range from lemon-shaped to nearly spherical with slightly pointed ends. It can grow to be pale green and later turn pale bluish grey or olivaceous with age. The fungus produces the toxic secondary metabolite, chaetochromin.

Botryotrichum piluliferum is a fungal species first identified in 1885 by Saccardo and Marchal. It was discovered to be the asexual state of a member of the ascomycete genus, Chaetomium. The name B. piluliferum now applies to the fungus in all its states. B. piluliferum has been found worldwide in a wide range of habitats such as animal dung and vegetation. The colonies of this fungus start off white and grow rapidly to a brown colour. The conidia are smooth and white. B. piluliferum grows optimally at a temperature of 25-30 °C and a pH of 5.5.

Arcopilus aureus is a plant and soil fungus in the genus Arcopilus. It was first identified by A. H. Chivers in 1912, who named it Chaetomium aureum. It was later transferred to the genus Arcopilus by Wang and colleagues. The fungus has recently been recognized to have industrial use for the production of the metabolites resveratrol. and sclerotiorin Additionally, A. aureus has high lead tolerance and clearance, suggesting a potential role in environmental biotechnology.

<i>Myxotrichum chartarum</i> Species of fungus

Myxotrichum chartarum is a psychrophilic and cellulolytic fungus first discovered in Germany by Gustav Kunze in 1823. Its classification has changed many times over its history to better reflect the information available at the time. Currently, M. chartarum is known to be an ascomycete surrounded by a gymnothecium composed of ornate spines and releases asexual ascospores. The presence of cellulolytic processes are common in fungi within the family Myxotrichaceae. M. chartarum is one of many Myxotrichum species known to degrade paper and paper products. Evidence of M. chartarum "red spot" mold formation, especially on old books, can be found globally. As a result, this fungal species and other cellulolytic molds are endangering old works of art and books. Currently, there is no evidence that suggests that species within the family Myxotrichaceae are pathogenic.

Zopfiella ebriosa is an unharmful fungus discovered covering the corks of wine bottles in 1991 in Tarragona, Spain. A member of the division Ascomycota, Zopfiella ebriosa is characterized by small and asymmetrical asci, presence of ostioles, and possession of germ slits.

Pseudothielavia terricola is a fungal species of the phylum Ascomycota, family Chaetomiaceae, and genus Pseudothielavia. Pseudothielavia terricola is widely distributed, especially in the tropical region of the world – with documented appearances in Africa, Southern Europe, and Asia. The species is mainly found in soil, but can also be found on other materials such as animal dung. The species was first assigned to the genus Coniothyrium in 1927, but was soon re-assigned to the genus Thielavia which endured for almost 90 years. Through intensive phylogenetic research and reassessment, the species was designated to a new genus, Pseudothielavia; the etymology of Pseudothielavia means similar to the genus Thielavia – the high resemblance was what contributed to the species assignment to the genus Thielavia nine decades ago. The fungus is mesophilic, grows abundantly in a pH level between 3.9–6, and is able to utilize multiple carbohydrates to support its growth. Mature Pseudothielavia terricola colonies in culture is dark brown in colour and spread out. Pseudothielavia terricola synthesizes a variety of compounds, two of which are thielavin A & B. These compounds were determined to be strong inhibitors of prostaglandin synthesis.

References

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  2. Wang, X.W.; Yang, F.Y.; Meijer, M.; Kraak, B.; Sun, B.D.; Jiang, Y.L.; Wu, Y.M.; Bai, F.Y.; Seifert, K.A.; Crous, P.W.; Samson, R.A.; Houbraken, J. (June 2019). "Redefining Humicola sensu stricto and related genera in the Chaetomiaceae". Studies in Mycology. 93: 65–153. doi:10.1016/j.simyco.2018.07.001. PMC   6133331 . PMID   30210181.
  3. 1 2 3 4 5 6 7 von ARX, J.A.; Guarro, J.; Figueras, M.J. (1986). The Ascomycete Genus Chaetomium. Berlin. ISBN   978-3443510053.
  4. 1 2 3 4 5 Carter, Adrian (May 1982). "A Taxonomic Study of The Ascomycete Genus Chaetomium Kunze".{{cite journal}}: Cite journal requires |journal= (help)
  5. 1 2 3 4 Seth, Hari K. (1970). A Monograph of the Genus Chaetomium. J. Cramer. ISBN   978-3768254373.
  6. Carter, A.; Khan, R.S. (September 1981). "New and Interesting Chaetomium species from East Africa". Canadian Journal of Botany. 60 (7): 1253–1262. doi:10.1139/b82-159.
  7. 1 2 3 Evidente, Antonio; Kornienko, Alexander; Cimmino, Alessio; Andolfi, Anna; Lefranc, Florence; Mathieu, Véronique; Kiss, Robert (May 2014). "Fungal Metabolites with Anticancer Activity". Natural Product Reports. 31 (5): 617–27. doi:10.1039/c3np70078j. PMID   24651312.
  8. 1 2 Rether, Jan; Erkel, Gerhard; Anke, Timm; Sterner, Olov (August 2004). "Oxaspirodion, a New Inhibitor of Inducible TNF-a Expression from Ascomycete Chaetomium subspirale". The Journal of Antibiotics. 57 (8): 493–495. doi: 10.7164/antibiotics.57.493 . PMID   15515885.