title: Characterization of Brca2-deficient plants excludes the role of NHEJ and SSA in the meiotic chromosomal defect phenotype.
abstract: In somatic cells, three major pathways are involved in the repair of DNA double-strand breaks (DBS): Non-Homologous End Joining (NHEJ), Single-Strand Annealing (SSA) and Homologous Recombination (HR). In somatic and meiotic HR, DNA DSB are 5' to 3' resected, producing long 3' single-stranded DNA extensions. Brca2 is essential to load the Rad51 recombinase onto these 3' overhangs. The resulting nucleofilament can thus invade a homologous DNA sequence to copy and restore the original genetic information. In Arabidopsis, the inactivation of Brca2 specifically during meiosis by an RNAi approach results in aberrant chromosome aggregates, chromosomal fragmentation and missegregation leading to a sterility phenotype. We had previously suggested that such chromosomal behaviour could be due to NHEJ. In this study, we show that knock-out plants affected in both BRCA2 genes show the same meiotic phenotype as the RNAi-inactivated plants. Moreover, it is demonstrated that during meiosis, neither NHEJ nor SSA compensate for HR deficiency in BRCA2-inactivated plants. The role of the plant-specific DNA Ligase6 is also excluded. The possible mechanism(s) involved in the formation of these aberrant chromosomal bridges in the absence of HR during meiosis are discussed.
authors: Institut de Biologie des Plantes, CNRS UMR8618, Université Paris Sud-11, Orsay, France.
authors: Marilyn
authors: M
authors: Dumont
authors: Sophie
authors: S
authors: Massot
authors: Marie-Pascale
authors: MP
authors: Doutriaux
authors: Ariane
authors: A
authors: Gratias
mesh_terms: D017360:Arabidopsis / Q000235:genetics*; D024682:BRCA2 Protein / Q000235:genetics*; D001483:Base Sequence; D002869:Chromosome Aberrations; D059766:DNA End-Joining Repair; D017931:DNA Primers; D008540:Meiosis / Q000235:genetics*; D010641:Phenotype; D016133:Polymerase Chain Reaction / Q000379:methods
chemical_list: D024682:BRCA2 Protein; D017931:DNA Primers