Recombination in yeast - substrate and genetic control
Main researcher
: ALAČEVIĆ, MARIJA (182) Assistants
ZGAGA, ZORAN (77902)
KOREN, PREDRAG (182502)
Type of research: basic Duration from: 03/01/91. to 03/01/94. Papers on project (total): 32
Papers on project quoted in Current Contents: 9
Institution name: Prehrambeno-biotehnološki fakultet, Zagreb (58) Department/Institute: Department of Biochemical Engineering Laboratory of Biology and Microbial Genetics Address: Pierottijeva 6 City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (041) 417-044
Fax: 385 (041) 411-436
E-mail: zgazo@mapbf.pbfrng.hr
Summary: Hybrid DNA is the central intermediate in homologous
recombination. Genetic studies have revealed that it may also contain
unpaired or mismatched bases, in which case it is called heteroduplex
DNA. We are studying the influence of such heterologies on the efficiency
of homologous recombination using plasmid (both double and
single-stranded) integration into the yeast chromosome as a model system.
Plasmids with changed bases are constructed by in vitro mutagenesis, while
the ratio betweeen homologous and homoeologous integrations is determined
by Southern blot technique. The effect of UV-induced lesions on
transformation with single- and double-stranded integrative plasmids was
also investigated, as well as the feasibility of yeast transformation
with single-stranded linear DNA. We also studied the influence of
mismatched bases on homologous recombination in Escherichia coli.
Research goals: Recombinational events are usually described as
either homologous or illegitimate. In the former case, the recombining
molecules share the same, or almost same sequence of nucleotides, while in
the lather case the recombining molecules are heterologous or they share
only very short homology. In our research we investigate the role of
heterologies on homologous recombination in yeast Saccharomyces cerevisiae,
using transformation with non-replicative plasmid as a model system. This
research will be complemented by the research performed at the level of
yeast and bacterial genome. We want to find out how much divergency is
tolerated in the process of homologous recombination and to describe the
mechanisms that prevent recombination between diverged sequences. We will
also investigate transformation with UV-irradiated plasmids and the
possibility of illegitimate plasmid integration in yeast. In addition to
its biological interest this investigation could also lead to the
development of alternative strategies for yeast strain construction.
COOPERATION - PROJECTS
Name of project
: CI1-0528-M DNA repair and strain construction
in yeast Name of institution: Institut Curie, Institut J. Monod City: Pariz, Francuska
COOPERATION - INSTITUTIONS
Name of institution
: Institut Jaques Monod Type of institution: University/Faculty Type of cooperation: Joint project City: Pariz, Francuska
Name of institution
: Institut Curie Type of institution: State institute Type of cooperation: Systematic exchange of information City: Pariz, Francuska Other information about the project.