title: Method for introducing specific and unmarked mutations into the chromosome of Streptococcus pneumoniae.
abstract: This work describes a procedure for the generation of site-specific mutations into the chromosome of Streptococcus pneumoniae that does not involve the use of an antibiotic resistance marker. A linear fragment of transforming deoxyribonucleic acid (DNA) is constructed by polymerase chain reaction (PCR) (gene splicing by overlap extension) and used to transform competent cells of S. pneumoniae. Selection of transformants is performed by PCR, and typically, 1% of the transformed cells show the expected mutation. By this protocol it is possible to change a single base pair into the pneumococcal genome, as well as obtaining in-frame deletions and insertions.
authors.affiliation: LAMMB, Biologia Molecolare/Università, Policlinico Le Scotte, Viale Bracci, 53100 Siena, Italy. iannelli@unisi.it
authors.forename: Francesco
authors.initials: F
authors.lastname: Iannelli
authors.forename: Gianni
authors.initials: G
authors.lastname: Pozzi
mesh_terms: D002455:Cell Division; D003470:Culture Media; D004247:DNA / Q000378:metabolism; D004586:Electrophoresis; D017353:Gene Deletion; D005821:Genetic Techniques; D016296:Mutagenesis; D009154:Mutation; D016133:Polymerase Chain Reaction / Q000379:methods; D017422:Sequence Analysis, DNA; D013296:Streptococcus pneumoniae / Q000235:genetics*; D013696:Temperature
chemical_list: D003470:Culture Media; D004247:DNA