scholarly journals Species-Level Identification of Isolates of the Acinetobacter calcoaceticus-Acinetobacter baumannii Complex by Sequence Analysis of the 16S-23S rRNA Gene Spacer Region

2005 ◽  
Vol 43 (4) ◽  
pp. 1632-1639 ◽  
Author(s):  
H. C. Chang ◽  
Y. F. Wei ◽  
L. Dijkshoorn ◽  
M. Vaneechoutte ◽  
C. T. Tang ◽  
...  
Keyword(s):  
Sequence Analysis ◽  
Acinetobacter Baumannii ◽  
Acinetobacter Calcoaceticus ◽  
Species Level ◽  
23S Rrna ◽  
Rrna Gene ◽  
23S Rrna Gene ◽  
Acinetobacter Baumannii Complex ◽  
Level Identification

scholarly journals Comparison of Genospecies and Antimicrobial Resistance Profiles of Isolates in the Acinetobacter calcoaceticus-Acinetobacter baumannii Complex from Various Clinical Specimens

2012 ◽  
Vol 56 (12) ◽  
pp. 6267-6271 ◽  
Author(s):  
Ni Tien ◽  
Bang-Jau You ◽  
Hui-Lan Chang ◽  
Hsiu-Shen Lin ◽  
Chin-Yi Lee ◽  
...  
Keyword(s):  
Antimicrobial Resistance ◽  
Acinetobacter Baumannii ◽  
Restriction Analysis ◽  
Acinetobacter Calcoaceticus ◽  
Its Region ◽  
Clinical Isolates ◽  
23S Rrna ◽  
Rrna Gene ◽  
Genotype 3 ◽  
Content Type

ABSTRACTThis study was conducted to compare the prevalences of antimicrobial resistance profiles of clinical isolates in theAcinetobacter calcoaceticus-Acinetobacter baumanniicomplex from sterile and nonsterile sites and to further study the relationship of antimicrobial resistance profiles and genospecies by amplified rRNA gene restriction analysis (ARDRA). A total of 1,381 isolates were tested with 12 different antibiotics to show their antimicrobial susceptibility profiles. A total of 205 clinical isolates were further analyzed by ARDRA of the intergenic spacer (ITS) region of the 16S-23S rRNA gene. It was found that the overall percentage of isolates from nonsterile sites (urine, sputum, pus, or catheter tip) that were resistant to the 12 antibiotics tested was significantly higher than that of isolates from sterile sites (cerebrospinal fluid [CSF], ascites fluid, and bloodstream) (46% versus 22%;P< 0.05). After ARDRA, it was found that 97% of the 62 isolates resistant to all antibiotics tested were theA. baumanniigenospecies, which was identified in only 31% of the isolates susceptible to all antibiotics tested. More genospecies diversity was identified in the isolates susceptible to all antibiotics tested, including genospecies of 13TU (34%), genotype 3 (29%), andA. calcoaceticus(5%). Furthermore, as 91% (10/11) of the isolates from CSF were susceptible to all antibiotics tested, theA. calcoaceticus-A. baumanniicomplex isolates with multidrug resistance could be less invasive than the more susceptible isolates. This study also indicated current emergence of carbapenem-, fluoroquinolone-, aminoglycoside-, and cephalosporin-resistantA. calcoaceticus-A. baumanniicomplex isolates in Taiwan.

scholarly journals Identification of Acinetobacter Genomic Species 13TU by Sequence Analysis of the 16S-23S rRNA Gene Spacer Region

2009 ◽  
Vol 47 (4) ◽  
pp. 1281-1282 ◽  
Author(s):  
R. Zarrilli ◽  
M. Giannouli ◽  
A. Di Popolo ◽  
F. Tomasone ◽  
Y.-W. Chu ◽  
...  
Keyword(s):  
Sequence Analysis ◽  
23S Rrna ◽  
Rrna Gene ◽  
Genomic Species ◽  
23S Rrna Gene

scholarly journals Amplification and Direct Sequence Analysis of the 23S rRNA Gene from Thermophilic Bacteria

BioTechniques ◽  
2001 ◽  
Vol 30 (2) ◽  
pp. 414-420 ◽  
Author(s):  
Ashraf Ibrahim ◽  
Jacob Hofman-Bang ◽  
Birgitte K. Ahring
Keyword(s):  
Sequence Analysis ◽  
Thermophilic Bacteria ◽  
23S Rrna ◽  
Rrna Gene ◽  
Direct Sequence ◽  
23S Rrna Gene ◽  
Direct Sequence Analysis

scholarly journals Helicobacter equorum sp. nov., a urease-negative Helicobacter species isolated from horse faeces

2007 ◽  
Vol 57 (2) ◽  
pp. 213-218 ◽  
Author(s):  
H. Moyaert ◽  
A. Decostere ◽  
P. Vandamme ◽  
L. Debruyne ◽  
J. Mast ◽  
...  
Keyword(s):  
Sequence Analysis ◽  
Related Species ◽  
Gene Sequence ◽  
Sequence Similarity ◽  
23S Rrna ◽  
Rrna Gene ◽  
The Novel ◽  
Rrna Gene Sequence ◽  
Closely Related Species ◽  
23S Rrna Gene

Gram-negative, curved, motile bacteria (strains EqF1T and EqF2) were isolated from faecal samples from two clinically healthy horses. Both strains possessed a single, monopolar, sheathed flagellum and were urease-negative. The novel strains grew at 37 °C under microaerobic conditions and were positive for oxidase, catalase and alkaline phosphatase activities. The isolates reduced nitrate to nitrite, but γ-glutamyl transpeptidase activity was not detected. The novel isolates did not grow at 42 °C or on media containing 1 % glycine. They were resistant to cephalotin and nalidixic acid and susceptible to metronidazole. Analysis of the 16S and 23S rRNA gene sequences of the two novel strains identified them as representing a single species within the genus Helicobacter. In terms of 16S rRNA gene sequence similarity, Helicobacter pullorum and Helicobacter canadensis were the most closely related species (98 % similarity). 23S rRNA gene sequence analysis also classified strains EqF1T and EqF2 within the enterohepatic division of the genus Helicobacter, but only 94 % similarity was detected with H. pullorum and H. canadensis, which are helicobacters with unsheathed flagella. The most closely related species in terms of 23S rRNA gene sequence similarity was Helicobacter canis (95 %). Numerical analysis of whole-cell protein extracts by SDS-PAGE was performed and the novel isolates were clearly differentiated from H. pullorum, H. canadensis, H. canis and other species of the genus Helicobacter. This finding was also confirmed by sequence analysis of the hsp60 gene. On the basis of these genetic, biochemical and protein data, the isolates are classified as representing a novel species, for which the name Helicobacter equorum sp. nov. is proposed (type strain EqF1T=LMG 23362T=CCUG 52199T).

scholarly journals Molecular pathways to high-level azithromycin resistance in Neisseria gonorrhoeae

2021 ◽  
Author(s):  
J G E Laumen ◽  
S S Manoharan-Basil ◽  
E Verhoeven ◽  
S Abdellati ◽  
I De Baetselier ◽  
...  
Keyword(s):  
Neisseria Gonorrhoeae ◽  
Ribosomal Proteins ◽  
Efflux Pump ◽  
23S Rrna ◽  
Rrna Gene ◽  
23S Rrna Gene ◽  
Evolution Of Resistance ◽  
High Level ◽  
Azithromycin Resistance ◽  
Level Resistance

Abstract Background The prevalence of azithromycin resistance in Neisseria gonorrhoeae is increasing in numerous populations worldwide. Objectives To characterize the genetic pathways leading to high-level azithromycin resistance. Methods A customized morbidostat was used to subject two N. gonorrhoeae reference strains (WHO-F and WHO-X) to dynamically sustained azithromycin pressure. We tracked stepwise evolution of resistance by whole genome sequencing. Results Within 26 days, all cultures evolved high-level azithromycin resistance. Typically, the first step towards resistance was found in transitory mutations in genes rplD, rplV and rpmH (encoding the ribosomal proteins L4, L22 and L34 respectively), followed by mutations in the MtrCDE-encoded efflux pump and the 23S rRNA gene. Low- to high-level resistance was associated with mutations in the ribosomal proteins and MtrCDE efflux pump. However, high-level resistance was consistently associated with mutations in the 23S ribosomal RNA, mainly the well-known A2059G and C2611T mutations, but also at position A2058G. Conclusions This study enabled us to track previously reported mutations and identify novel mutations in ribosomal proteins (L4, L22 and L34) that may play a role in the genesis of azithromycin resistance in N. gonorrhoeae.

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