出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2012/11/24 12:38:19」(JST)
Candida albicans | |
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Scientific classification | |
Kingdom: | Fungi |
Phylum: | Ascomycota |
Subphylum: | Saccharomycotina |
Class: | Saccharomycetes |
Order: | Saccharomycetales |
Family: | Saccharomycetaceae |
Genus: | Candida |
Species: | C. albicans |
Binomial name | |
Candida albicans (C.P. Robin) |
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Synonyms | |
Candida stellatoidea[1] Oidium albicans[2] |
Candida albicans is a diploid fungus that grows both as yeast and filamentous cells and a causal agent of opportunistic oral and genital infections in humans.[3][4] Systemic fungal infections (fungemias) including those by C. albicans have emerged as important causes of morbidity and mortality in immunocompromised patients (e.g., AIDS, cancer chemotherapy, organ or bone marrow transplantation). C. albicans biofilms may form on the surface of implantable medical devices. In addition, hospital-acquired infections by C. albicans have become a cause of major health concerns.
C. albicans is commensal and a constituent of the normal gut flora comprising microorganisms that live in the human mouth and gastrointestinal tract. C. albicans lives in 80% of the human population without causing harmful effects, although overgrowth of the fungus results in candidiasis (candidosis). Candidiasis is often observed in immunocompromised individuals such as HIV-infected patients. A common form of candidiasis restricted to the mucosal membranes in mouth or vagina is thrush, which is usually easily cured in people who are not immunocompromised. For example, higher prevalence of colonization of C. albicans was reported in young individuals with tongue piercing, in comparison to unpierced matched individuals.[5] To infect host tissue, the usual unicellular yeast-like form of C. albicans reacts to environmental cues and switches into an invasive, multicellular filamentous form, a phenomenon called dimorphism.[3]
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One of the most important features of the C. albicans genome is the occurrence of numeric and structural chromosomal rearrangements as means of generating genetic diversity, named chromosome length polymorphisms (contraction/expansion of repeats), reciprocal translocations, chromosome deletions and trisomy of individual chromosomes. These karyotypic alterations lead to changes in the phenotype, which is an adaptation strategy of this fungus. These mechanisms will be better understood with the complete analysis of the C. albicans genome.
The C. albicans genome for strain SC5314 was sequenced at the Stanford DNA Sequencing and Technology Center.[6][7] The genome of the WO1 strain was sequenced by the Broad Institute of MIT and Harvard.[8]
The sequencing of the C. albicans genome and subsequently of the genomes of several other medically relevant Candida species has profoundly and irreversibly changed the way Candida species are now investigated and understood.[4] The C. albicans genome sequencing effort was launched in October 1996. Successive releases of the sequencing data and genome assemblies have occurred in the last 10 years, culminating in the release of the diploid assembly 19, which provided a haploid version of the genome along with data on allelic regions in the genome.[4] A refined assembly 20 with the eight assembled C. albicans chromosomes was released in the summer of 2006. Importantly, the availability of sequencing data prior to the completion of the genome sequence has made it possible to start C. albicans postgenomics early on. In this regard, genome databases have been made available to the research community, providing different forms of genome annotation. These have been merged in a community-based annotation hosted by the Candida Genome Database. The availability of the genome sequence has paved the way for the implementation of postgenomic approaches to the study of C. albicans: macroarrays and then microarrays have been developed and used to study the C. albicans transcriptome; proteomics has also been developed and complements transcriptional analyses; furthermore, systematic approaches are becoming available to study the contribution of each C. albicans gene in different contexts. Other Candida genome sequences have been, or are being, determined: C. glabrata, C. dubliniensis, C. parapsilosis, C. guilliermondii, C. lusitaniae, and C. tropicalis. These species will soon enter the postgenomic era, as well, and provide interesting comparative data. The genome sequences obtained for the different Candida species along with those of nonpathogenic hemiascomycetes provide a wealth of knowledge on the evolutionary processes that shaped the hemiascomycete group, as well as those that may have contributed to the success of different Candida species as pathogens.[4]
An unusual feature of the Candida genus is that in many of its species (including C. albicans and C. tropicalis, but not, for instance, C. glabrata) the CUG codon, which normally specifies leucine, specifies serine in these species. This is an unusual example of a departure from the universal genetic code, and most such departures are in start codons or, for eukaryotes, mitochondrial genetic codes.[9][10][11] This alteration may, in some environments, help these Candida species by inducing a permanent stress response, a more generalized form of the heat shock response.[12]
The genome of C. albicans is highly dynamic, and this variability has been used advantageously for molecular epidemiological studies and population studies in this species. The genome sequence has allowed for identifying the presence of a parasexual cycle (no meiotic division) in C. albicans.[13] This parasexual cycle is under the control of mating-type loci and switching between white and opaque phenotypes. Investigating the role the mating process plays in the dynamics of the C. albicans population or in other aspects of C. albicans biology and pathogenicity will undoubtedly represent an important focus for future research.[4] A similar lack of meiosis was found in Saccharomyces cerevisiae altered to use the same genetic code as C. albicans.[14]
Although often referred to as "dimorphic", C. albicans is in fact polyphenic. When cultured in standard yeast laboratory medium, C. albicans grows as ovoid "yeast" cells. However, mild environmental changes in temperature and pH can result in a morphological shift to pseudohyphal growth. Pseudohyphae share many similarities with yeast cells,[15] but their role during candidiasis remains unknown. When C. albicans cells are grown in a medium that mimics the physiological environment of a human host, they grow as "true" hyphae. Its ability to form hyphae has been proposed as a virulence factor, as these structures are often observed invading tissue, and strains that are unable to form hyphae are defective in causing infection.
In a process that superficially resembles dimorphism, C. albicans undergoes a process called phenotypic switching, in which different cellular morphologies are generated spontaneously. Of the classically studied strains, one that undergoes phenotypic switching is WO-1,[16] which consists of two phases: one that grows as round cells in smooth, white colonies and one that is rod-like and grows as flat, gray colonies. The other strain known to undergo switching is 3153A; this strain produces at least seven different colony morphologies. In both the WO-1 and 3153A strains, the different phases convert spontaneously to the other(s) at a low frequency. The switching is reversible, and colony type can be inherited from one generation to another. While several genes that are expressed differently in different colony morphologies have been identified, some recent efforts focus on what might control these changes. Further, whether a potential molecular link between dimorphism and phenotypic switching occurs is a tantalizing question.
In the 3153A strain, a gene called SIR2 (for silent information regulator), which seems to be important for phenotypic switching, has been found. SIR2 was originally found in Saccharomyces cerevisiae (brewer's yeast), where it is involved in chromosomal silencing—a form of transcriptional regulation, in which regions of the genome are reversibly inactivated by changes in chromatin structure (chromatin is the complex of DNA and proteins that make chromosomes). In yeast, genes involved in the control of mating type are found in these silent regions, and SIR2 represses their expression by maintaining a silent-competent chromatin structure in this region. The discovery of a C. albicans SIR2 implicated in phenotypic switching suggests it, too, has silent regions controlled by SIR2, in which the phenotype-specific genes may reside.
Another potential regulatory molecule is Efg1p, a transcription factor found in the WO-1 strain that regulates dimorphism, and more recently has been suggested to help regulate phenotypic switching. Efg1p is expressed only in the white and not in the gray cell-type, and overexpression of Efg1p in the gray form causes a rapid conversion to the white form.[17][18]
So far, very few data sugget dimorphism and phenotypic switching use common molecular components. However, it is not inconceivable that phenotypic switching may occur in response to some change in the environment, as well as being a spontaneous event. How SIR2 itself is regulated in S. cerevisiae may yet provide clues as to the switching mechanisms of C. albicans.
The heterozygosity of the Candida genome exceeds that found in other genomes and is widespread among clinical isolates. Nonsynonymous single-base polymorphisms result in two proteins that differ in one or several amino acids that may confer functional differences for each protein. This situation considerably increases the number of different proteins encoded by the genome.[19]
Treatment commonly includes:[citation needed]
Other Treatments:
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国試過去問 | 「114F072」「097A059」「100A059」「089A051」 |
リンク元 | 「真菌」「免疫不全症候群」「敗血症」「尿路感染症」「真菌症」 |
拡張検索 | 「Candida albicans infections」 |
関連記事 | 「Candida」「albicans」 |
DE
※国試ナビ4※ [114F071]←[国試_114]→[114F073]
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※国試ナビ4※ [097A058]←[国試_097]→[097A060]
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※国試ナビ4※ [100A058]←[国試_100]→[100A060]
分類群 | 菌名 | 病名 | 出芽分裂 | 菌体 | 菌糸 | 胞子 | 発芽管 | 寄生性 | 感染経路 | 病原体の特徴 | 病型 | 検査 | 治療 |
不完全菌 | Candida albicans | カンジダ症 | 仮性菌糸 | 厚膜胞子 | 形成 | 常在菌→各所 | 日和見感染症 | ||||||
担子菌 | Filobasidiella neoformans | クリプトコッカス症 | 出芽 | 厚い莢膜 | 通性細胞内寄生体 | 鳩の乾燥糞→空気感染→肺(通性細胞内寄生体) | 日和見感染菌 | 肺クリプトコッカス症、 中枢神経クリプトコッカス症、 皮膚クリプトコッカス症、 全身性クリプトコッカス症 |
墨汁染色 | ( アムホテリシンB or フルコナゾール ) ± フルシトシン | |||
不完全菌 | Trichosporon asahii | トリコスポロン症 | 仮性菌糸 | 分節分生子 | |||||||||
子嚢菌 | Aspergillus fumigatus/ 'Aspergillus flavus |
アスペルギルス症 | 糸状菌 不完全菌 |
有隔菌糸 | 土壌や朽ちた植物、空気中の浮遊胞子 | ||||||||
Mucor/'Rhizopus/ Absidia/Rhizomucor |
ムコール症 | 無隔菌糸 | 血管に親和性 | 土壌や朽ちた植物、空気中の浮遊胞子 → 浮遊胞子の吸入 |
鼻眼脳型ムコール症 侵襲性肺ムコール症 全身播種型ムコール症 |
β-D-グルカン陰性。 喀痰、血培陰性 |
アムホテリシンB | ||||||
子嚢菌 | Pneumocystis jirovecii ('Pneumocystis carini) |
ニューモシスチス・カリニ感染症 | |||||||||||
子嚢菌 | Histoplasma capsulatum | ヒストプラスマ症 | 二形性真菌 37℃酵母型発育 25℃菌糸形成 |
空気感染。肺に一次病変を作り様々な臓器に播種 | AIDS患者に好発 | ||||||||
不完全菌 | Coccidioides immitis | コクシジオイデス症 | 二形性真菌 | 内生胞子 | |||||||||
不完全菌 | Sporothrix schenckii | スポロトリクス症 | 二形性真菌 |
白癬 | スポロトリコーシス | 皮膚カンジダ症 | 癜風 | |
原因菌 | 皮膚糸状菌 | Sporothrix schenckii | Candida albicans | Malassezia furfur |
症状 | 頭部、顔面、体部、股部、足の白癬 | 皮下結節→潰瘍化 | 指趾間びらん、爪周囲炎、粘膜カンジダ | 胸・背部に黒・白色斑 |
検査 | KOH法 | スポロトリキン反応、PAS染色法 | KOH法 | KOH法、Wood灯検査 |
治療 | 抗真菌薬外用、抗真菌薬内服 | ヨードカリ内服、温熱療法、抗真菌薬内服 | イミダゾール系抗真菌薬外用 | 抗真菌薬外用 |
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