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Carbapenemases and their molecular genetic detection in bacteria causing severe hospital acquired infections
Vavrová, Jolana ; Dřevínek, Pavel (advisor) ; Zikánová, Blanka (referee)
The aim of this study is to characterize β-lactamases that hydrolyze carbapenems. They belong to molecular classes A, B and D and their new variations are still being identified. The production of enzymes hydrolyzing β-lactam antibiotics is common among Gram-negative bacteria which include also serious nosocomial pathogens such as Pseudomonas aeruginosa, Acinetobacter baumannii or members of Enterobacteriaceae family. The importance of the carbapenemases in clinical practice underlines the fact that carbapenems are broad-spectrum antibiotics, which are considered the reserve antibiotics. An increase in the number of cases of the carbapenem resistance is caused mainly by spread of genes encoding carbapenemases. Detection of carbapenemases and surveillance of their occurrence are both essential not only for optimal management of patients' care, but also for control of the spread of bacterial strains producing carbapenemases.
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Finalizing the full genome sequence of epidemic strain Burkholderia cenocepacia ST32 and identification of a prognostic marker for infections that are caused by the ST32 strain in patients with cystic fibrosis
Vavrová, Jolana ; Dřevínek, Pavel (advisor) ; Wiedermannová, Jana (referee)
Burkholderia cenocepcia is one of the serious infectious agents of respiratory tract among cystic fibrosis patients. There are problems mainly with strains which are capable of epidemic spread. The known epidemic in the Czech Republic was caused by ST32 strain in the past. In this work, there was completed whole genome sequence of referential isolate 1232 of B. cenocepacia ST32 in cooperation with bioinformatics by new generation sequencing techniques and by determining the problematic areas by a combination of Sanger sequencing bioinformatics approaches and manual assembling of sequence reads localized in these areas. The final version of the genome sequence was annotated by PGAAP and at the present time it is finalized. Second part of this work is dedicated to looking for a prognostic marker of infection caused by ST32 strain in patients with cystic fibrosis. We analysed the results of ST32 trancriptomic experiment and chose genes possibly connected with the cepacia syndrome - serious, mostly fatal state of infection. By quantitative PCR we compared their expression in isolates from 4 patients from time of cepacia syndrome and month before that. We checked the possibility of direct detection of the expression of these genes in clinical material. We identified genes for type III secretion system as...
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Carbapenemases and their molecular genetic detection in bacteria causing severe hospital acquired infections
Vavrová, Jolana ; Dřevínek, Pavel (advisor) ; Zikánová, Blanka (referee)
The aim of this study is to characterize β-lactamases that hydrolyze carbapenems. They belong to molecular classes A, B and D and their new variations are still being identified. The production of enzymes hydrolyzing β-lactam antibiotics is common among Gram-negative bacteria which include also serious nosocomial pathogens such as Pseudomonas aeruginosa, Acinetobacter baumannii or members of Enterobacteriaceae family. The importance of the carbapenemases in clinical practice underlines the fact that carbapenems are broad-spectrum antibiotics, which are considered the reserve antibiotics. An increase in the number of cases of the carbapenem resistance is caused mainly by spread of genes encoding carbapenemases. Detection of carbapenemases and surveillance of their occurrence are both essential not only for optimal management of patients' care, but also for control of the spread of bacterial strains producing carbapenemases.
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