%0 Journal Article %1 shultz_vitro_2005 %A Shultz, Tiffany R %A White, Peter A %A Tapsall, John W %D 2005 %J Antimicrobial Agents and Chemotherapy %K Acid Agents, Amino Bacterial, Chain Drug Fluoroquinolones, Gyrase, Microbial Mutation, Neisseria Polymerase Reaction Resistance, Reverse Sensitivity Substitution, Tests, Topoisomerase Transcriptase meningitidis, {Anti-Bacterial} {DNA,} {DNA} {IV,} %N 5 %P 1753--60 %R 49/5/1753 %T In vitro assessment of the further potential for development of fluoroquinolone resistance in Neisseria meningitidis %U http://www.ncbi.nlm.nih.gov/pubmed/15855492 %V 49 %X We examined the potential for the development of fluoroquinolone resistance in Neisseria meningitidis by cultivating two clinical isolates of meningococci in the presence of concentrations of ciprofloxacin at and about the predetermined MIC. The quinolone resistance determining regions (QRDRs) of gyrA and parC of 50 stable quinolone-resistant mutants derived in vitro were sequenced and compared with QRDR alterations reported in clinical isolates of quinolone-resistant meningococci and gonococci. MICs to ciprofloxacin and trovafloxacin were determined and sequence changes were correlated with quinolone MICs. Ciprofloxacin and trovafloxacin MICs of the in vitro-derived quinolone-resistant mutants ranged up to 16 mg/liter. Single GyrA alterations were the first change detected and were accompanied by raised MICs, followed by double GyrA changes and still higher MICs. MICs increased further as single ParC substitutions appeared and these were always in the presence of a single or double GyrA change. GyrA changes occurred at positions 91 and 95 with substitutions of Asp-95--\textgreaterAsn and Thr-91--\textgreaterAla and Ile. Changes in the parC QRDR occurred at positions 85, 86, and 91 with four substitutions, Gly-85--\textgreaterAsp, Asp-86--\textgreaterAsn, Glu-91--\textgreaterGly, and Glu-91--\textgreaterLys, detected. The nature of the individual QRDR substitution appeared to influence the level of quinolone resistance expressed, and this varied with the quinolone agent examined. Close similarities occurred between the sequence and nature of QRDR changes in clinical and in vitro-generated quinolone-resistant mutants and with those previously reported for clinical and in vitro-generated quinolone-resistant gonococci. This suggests that quinolone resistance in meningococci may arise in the same manner and reach similar levels in vivo to those seen in quinolone-resistant Neisseria gonorrhoeae.

@article{shultz_vitro_2005, abstract = {We examined the potential for the development of fluoroquinolone resistance in Neisseria meningitidis by cultivating two clinical isolates of meningococci in the presence of concentrations of ciprofloxacin at and about the predetermined {MIC.} The quinolone resistance determining regions {(QRDRs)} of {gyrA} and {parC} of 50 stable quinolone-resistant mutants derived in vitro were sequenced and compared with {QRDR} alterations reported in clinical isolates of quinolone-resistant meningococci and gonococci. {MICs} to ciprofloxacin and trovafloxacin were determined and sequence changes were correlated with quinolone {MICs.} Ciprofloxacin and trovafloxacin {MICs} of the in vitro-derived quinolone-resistant mutants ranged up to 16 mg/liter. Single {GyrA} alterations were the first change detected and were accompanied by raised {MICs,} followed by double {GyrA} changes and still higher {MICs.} {MICs} increased further as single {ParC} substitutions appeared and these were always in the presence of a single or double {GyrA} change. {GyrA} changes occurred at positions 91 and 95 with substitutions of {Asp-95--{\textgreater}Asn} and {Thr-91--{\textgreater}Ala} and Ile. Changes in the {parC} {QRDR} occurred at positions 85, 86, and 91 with four substitutions, {Gly-85--{\textgreater}Asp,} {Asp-86--{\textgreater}Asn,} {Glu-91--{\textgreater}Gly,} and {Glu-91--{\textgreater}Lys,} detected. The nature of the individual {QRDR} substitution appeared to influence the level of quinolone resistance expressed, and this varied with the quinolone agent examined. Close similarities occurred between the sequence and nature of {QRDR} changes in clinical and in vitro-generated quinolone-resistant mutants and with those previously reported for clinical and in vitro-generated quinolone-resistant gonococci. This suggests that quinolone resistance in meningococci may arise in the same manner and reach similar levels in vivo to those seen in quinolone-resistant Neisseria gonorrhoeae.}, added-at = {2011-03-11T10:05:34.000+0100}, author = {Shultz, Tiffany R and White, Peter A and Tapsall, John W}, biburl = {https://www.bibsonomy.org/bibtex/2ad615084f91cce5f5ce5e04c09655392/jelias}, doi = {49/5/1753}, interhash = {a390c97cad352c732b7e8d91b823b134}, intrahash = {ad615084f91cce5f5ce5e04c09655392}, issn = {0066-4804}, journal = {Antimicrobial Agents and Chemotherapy}, keywords = {Acid Agents, Amino Bacterial, Chain Drug Fluoroquinolones, Gyrase, Microbial Mutation, Neisseria Polymerase Reaction Resistance, Reverse Sensitivity Substitution, Tests, Topoisomerase Transcriptase meningitidis, {Anti-Bacterial} {DNA,} {DNA} {IV,}}, month = may, note = {{PMID:} 15855492}, number = 5, pages = {1753--60}, timestamp = {2011-03-11T10:06:28.000+0100}, title = {In vitro assessment of the further potential for development of fluoroquinolone resistance in Neisseria meningitidis}, url = {http://www.ncbi.nlm.nih.gov/pubmed/15855492}, volume = 49, year = 2005 }