Track topics on Twitter Track topics that are important to you
Streptococcus pneumoniae (pneumococcus), a deadly bacterial human pathogen, uses genetic transformation to gain antibiotic resistance. Genetic transformation begins when a pneumococcal strain in a transient specialized physiological state called competence, attacks and lyses another strain, releasing DNA, taking up fragments of the liberated DNA, and integrating divergent genes into its genome. While many steps of the process are known and generally understood, the precise mechanism of this natural genetic transformation is not fully understood and the current standard strategies to study it have limitations in specifically controlling and observing the process in detail. To overcome these limitations, we have developed a droplet microfluidic system for isolating individual episodes of bacterial transformation between two confined cells of pneumococcus. By encapsulating the cells in a 10 μm diameter aqueous droplet, we provide an improved experimental model of genetic transformation, as both participating cells can be identified, and the released DNA is spatially restricted near the attacking strain. Specifically, the bacterial cells, one rifampicin (R) resistant, the other novobiocin (N) and spectinomycin (S) resistant were encapsulated in droplets carried by the fluorinated oil FC-40 with 5% surfactant and allowed to carry out competence-specific attack and DNA uptake (and consequently gain antibiotic resistances) within the droplets. The droplets were then broken, and recombinants were recovered by selective plating with antibiotics. The new droplet system encapsulated 2 or more cells in a droplet with a probability up to 71%, supporting gene transfer rates comparable to standard mixtures of unconfined cells. Thus, confinement in droplets allows characterization of natural genetic transformation during a strictly defined interaction between two confined cells.
This article was published in the following journal.
Name: Lab on a chip
The objective of this study was to explore the genetic diversity of Streptococcus pneumoniae by using antibiotic susceptibility testing, serotyping and multilocus sequence typing (MLST) in a Tunisian ...
Clinicians rely on clinical presentations to select therapeutic agents for acute bacterial rhinosinusitis. Streptococcus pneumoniae and Haemophilus influenzae are common in acute bacterial rhinosinusi...
Streptococcus pneumoniae is responsible for
It is estimated that over 80% of bacterial infections are associated with biofilm formation. Biofilms are organized bacterial communities formed on abiotic surfaces, such as implanted or inserted medi...
In this study, we evaluated the Sofia Streptococcus pneumoniae FIA test (Quidel Corporation, San Diego, CA, USA), a new immunofluorescence-based lateral flow test for the qualitative detection of S. p...
Primary Objective: Evaluation of the - Carriage rate of Streptococcus pneumoniae in the nasopharynx of children Secondary Objective: - Carriage rate and distribution of Strepto...
Evaluation of the carriage rate of Streptococcus pneumoniae in the nasopharynx of healthy children and the carriage rate and distribution of Streptococcus pneumoniae serotypes
The proposed study aims to provide current information, etiology and outcome of community-acquired pneumonia (CAP), risk factors for for CAP in isolates of Streptococcus pneumoniae and Ha...
Streptococcus pseudopneumoniae as suggested by DNA-DNA homology studies is recorded as a species of the Streptococcus mitis/oralis members of viridans group Streptococci; they have some si...
This study is to observe the carriage rate ofStreptococcus pneumoniae (S.p.), Haemophilus influenzae type b (Hib) and Moraxella catarrhalis （M.Cat） in healthy Chinese children aged 12-...
Production of new arrangements of DNA by various mechanisms such as assortment and segregation, CROSSING OVER; GENE CONVERSION; GENETIC TRANSFORMATION; GENETIC CONJUGATION; GENETIC TRANSDUCTION; or mixed infection of viruses.
The uptake of naked or purified DNA by CELLS, usually meaning the process as it occurs in eukaryotic cells. It is analogous to bacterial transformation (TRANSFORMATION, BACTERIAL) and both are routinely employed in GENE TRANSFER TECHNIQUES.
A febrile disease caused by STREPTOCOCCUS PNEUMONIAE.
Infections with bacteria of the species STREPTOCOCCUS PNEUMONIAE.
Change brought about to an organisms genetic composition by unidirectional transfer (TRANSFECTION; TRANSDUCTION, GENETIC; CONJUGATION, GENETIC, etc.) and incorporation of foreign DNA into prokaryotic or eukaryotic cells by recombination of part or all of that DNA into the cell's genome.
Pneumonia (bronchopneumonia, lobar pneumonia and double pneumonia) is inflammation (swelling) of the tissue in one or both of your lungs. It is usually caused by an pneumococcal infection caused by bacteria called Streptococcus pneumoniae. However,...
MRSA (methicillin-resistant Staphylococcus aureus)
MRSA (methicillin-resistant Staphylococcus aureus) is a family of bacteria with resistance to one or more major antibiotics. There are currently 17 different strains of MRSA. Two particular strains, EMRSA15 and EMRSA16 account for 96% of MRSA blood...