A New Genus of the Actinomycetales: Micropolyspora gen. nov.

Lechevalier, H. A.; Solotorovsky, Morris; McDURMONT, C.

doi:10.1099/00221287-26-1-11

Cited by 51 publications

(16 citation statements)

References 7 publications

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“…The data set consisting of the type strains of the type species of the genera included in this study can be requested from the authors. The following genera have either not yet been investigated by 16s rDNA sequence analysis and their phylogenetic affiliation remains undetermined or their exact phylogenetic position is unclear: Actinocorullia (68), Actinokineosporu (64), Excellospora (l), Kineococcus (186), Kineosporiu (112), and Micropolyspora (93).…”

Section: Methodsmentioning

confidence: 99%

Proposal for a New Hierarchic Classification System, Actinobacteria classis nov.

Stackebrandt

Rainey

Ward-Rainey

1997

International Journal of Systematic Bacteriology

1,728

846

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A new hierarchic classification structure for the taxa between the taxonomic levels of genus and class is proposed for the actinomycete line of descent as defined by analysis of small subunit (16s) rRNA and genes coding for this molecule (rDNA). While the traditional circumscription of a genus of the actinomycete subphylum is by and large in accord with the 16s rRNA/rDNA-based phylogenetic clustering of these organisms, most of the higher taxa proposed in the past do not take into account the phylogenetic clustering of genera. The rich chemical, morphological and physiological diversity of phylogenetically closely related genera makes the description of families and higher taxa so broad that they become meaningless for the description of the enclosed taxa. Here we present a classification system in which phylogenetically neighboring taxa at the genus level are clustered into families, suborders, orders, subclasses, and a class irrespective of those phenotypic characteristics on which the delineation of taxa has been based in the past. Rather than being based on a listing of a wide array of chemotaxonomic, morphological, and physiological properties, the delineation is based solely on 16s rDNA/rRNA sequence-based phylogenetic clustering and the presence of taxon-specific 16s rDNA/RNA signature nucleotides.In their publication "On the nature of global classification," Wheelis et al. (177) based the definition of higher taxa on the molecular level of universally homologous functions. This statement is derived from the high correlation of genealogical trees inferred from several such molecules, e.g., genes coding for 16s rRNA (16s rDNA) (179), 23s rDNA (96), elongation factors involved in the translation process, and the P-subunit of ATPase (97). The authors (177) stress that a basic requirement of a global classification is uniformity in methods and characteristics used in defining and ranking taxa. Nonhomologous characteristics, on the other hand, may be useful in confirming the molecular groupings. Application of this classification strategy led to the description of domains for the three highest taxa recognized today, the Archaea, Bacteria, and Eucarya Within the domain Bacteria, more than 15 lineages, which in phylogenetic uniqueness and ancestry are comparable to the archaeal kingdoms, have been identified. The taxonomic rank of kingdom has not yet been proposed for any of these lineages. The taxon class Proteobacteria has been proposed for a phylogenetically broad cluster of gram-negative genera, and several orders have been described for some of the phylogenetic lineages that emerged from the comparison of evolutionarily conserved macromolecules, e.g., Aquificales (19, Thermotogales (67), Verrucomicrobiales (173), and Planctomycetales (138). These phylogenetically coherent taxa are now used side by side with higher taxa that were described at the beginning of the pre-molecular era, i.e., before or around 1984. While the phylogenetic coherence of the division Firmacutes (53), the class Mollicutes, and the ord...

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Section: Methodsmentioning

confidence: 99%

Proposal for a New Hierarchic Classification System, Actinobacteria classis nov.

Stackebrandt

Rainey

Ward-Rainey

1997

International Journal of Systematic Bacteriology

1,728

846

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“…N. brevicatena was formerly classified as Micropolyspora brevicatena (40,122) and subsequently was transferred to the genus Nocardia (73) based upon its cell wall composition.…”

Section: Nocardia Abscessus (Formerly N Asteroides Type I Drug Suscementioning

confidence: 99%

Clinical and Laboratory Features of theNocardiaspp. Based on Current Molecular Taxonomy

et al. 2006

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SUMMARY The recent explosion of newly described species of Nocardia results from the impact in the last decade of newer molecular technology, including PCR restriction enzyme analysis and 16S rRNA sequencing. These molecular techniques have revolutionized the identification of the nocardiae by providing rapid and accurate identification of recognized nocardiae and, at the same time, revealing new species and a number of yet-to-be-described species. There are currently more than 30 species of nocardiae of human clinical significance, with the majority of isolates being N. nova complex, N. abscessus, N. transvalensis complex, N. farcinica, N. asteroides type VI (N. cyriacigeorgica), and N. brasiliensis. These species cause a wide variety of diseases and have variable drug susceptibilities. Accurate identification often requires referral to a reference laboratory with molecular capabilities, as many newer species are genetically distinct from established species yet have few or no distinguishing phenotypic characteristics. Correct identification is important in deciding the clinical relevance of a species and in the clinical management and treatment of patients with nocardial disease. This review characterizes the currently known pathogenic species of Nocardia, including clinical disease, drug susceptibility, and methods of identification.

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“…21, 22). This structure represents the collar observed by Lechevalier & Lechevalier (1957) in a silhouette of such a spore.…”

Section: S T W I L L I a M Smentioning

confidence: 99%

Further Investigations of Actinomycetes by Scanning Electron Microscopy

Williams

1970

Journal of General Microbiology

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S U M M A R YTo improve results obtained when examining actinomycetes by scanning electron microscopy, the microscope was operated under conditions giving higher resolution with a reduced but sufficient depth of focus. In addition, fixation and dehydration of specimens before coating reduced the distortion caused by desiccation under vacuum. By these means, representatives of the following genera were examined : Actinobijida, Actinoplanes, Actinopycnidium, Actinosporangiurn, Microbispora, Microechinospora, Microellobosporia, Planomonospora, Sporichthya, Thermoactinomyces and Thermomonospora. The study revealed points of similarity between Actinopycnidium and Actinosporangium ; Microellobosporia and Microechinospora ; and Actinobijida and Thermoactinomyces.

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A New Genus of the Actinomycetales: Micropolyspora gen. nov.

Cited by 51 publications

References 7 publications

Proposal for a New Hierarchic Classification System, Actinobacteria classis nov.

Proposal for a New Hierarchic Classification System, Actinobacteria classis nov.

Clinical and Laboratory Features of theNocardiaspp. Based on Current Molecular Taxonomy

Further Investigations of Actinomycetes by Scanning Electron Microscopy

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