Defects in the GINS complex increase the instability of repetitive sequences via a recombination-dependent mechanism

Autoři: Malgorzata Jedrychowska aff001;  Milena Denkiewicz-Kruk aff001;  Malgorzata Alabrudzinska aff001;  Adrianna Skoneczna aff001;  Piotr Jonczyk aff001;  Michal Dmowski aff001;  Iwona J. Fijalkowska aff001
Působiště autorů: Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland aff001
Vyšlo v časopise: Defects in the GINS complex increase the instability of repetitive sequences via a recombination-dependent mechanism. PLoS Genet 15(12): e32767. doi:10.1371/journal.pgen.1008494
Kategorie: Research Article
doi: 10.1371/journal.pgen.1008494


Faithful replication and repair of DNA lesions ensure genome maintenance. During replication in eukaryotic cells, DNA is unwound by the CMG helicase complex, which is composed of three major components: the Cdc45 protein, Mcm2-7, and the GINS complex. The CMG in complex with DNA polymerase epsilon (CMG-E) participates in the establishment and progression of the replisome. Impaired functioning of the CMG-E was shown to induce genomic instability and promote the development of various diseases. Therefore, CMG-E components play important roles as caretakers of the genome. In Saccharomyces cerevisiae, the GINS complex is composed of the Psf1, Psf2, Psf3, and Sld5 essential subunits. The Psf1-1 mutant form fails to interact with Psf3, resulting in impaired replisome assembly and chromosome replication. Here, we show increased instability of repeat tracts (mononucleotide, dinucleotide, trinucleotide and longer) in yeast psf1-1 mutants. To identify the mechanisms underlying this effect, we analyzed repeated sequence instability using derivatives of psf1-1 strains lacking genes involved in translesion synthesis, recombination, or mismatch repair. Among these derivatives, deletion of RAD52, RAD51, MMS2, POL32, or PIF1 significantly decreased DNA repeat instability. These results, together with the observed increased amounts of single-stranded DNA regions and Rfa1 foci suggest that recombinational mechanisms make important contributions to repeat tract instability in psf1-1 cells. We propose that defective functioning of the CMG-E complex in psf1-1 cells impairs the progression of DNA replication what increases the contribution of repair mechanisms such as template switch and break-induced replication. These processes require sequence homology search which in case of a repeated DNA tract may result in misalignment leading to its expansion or contraction.

Klíčová slova:

DNA recombination – DNA repair – DNA replication – Genetic networks – Mutagenesis – Repeated sequences – Yeast – Protein structure networks


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