The FANCM ortholog Fml1 promotes recombination at stalled replication forks and limits crossing over during DNA double-strand break repair.
The Fanconi anemia (FA) core complex promotes the tolerance/repair of DNA damage at stalled replication forks by catalyzing the monoubiquitination of FANCD2 and FANCI. Intriguingly, the core complex component FANCM also catalyzes branch migration of model Holliday junctions and replication forks in vitro. Here we have characterized the ortholog of FANCM in fission yeast Fml1 in order to understand the physiological significance of this activity. We show that Fml1 has at least two roles in homologous recombination-it promotes Rad51-dependent gene conversion at stalled/blocked replication forks and limits crossing over during mitotic double-strand break repair. In vitro Fml1 catalyzes both replication fork reversal and D loop disruption, indicating possible mechanisms by which it can fulfill its pro- and antirecombinogenic roles.
Sun
Weili
W
Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK.
Nandi
Saikat
S
Osman
Fekret
F
Ahn
Jong Sook
JS
Jakovleska
Jovana
J
Lorenz
Alexander
A
Whitby
Matthew C
MC
D003434:Crossing Over, Genetic; D053903:DNA Breaks, Double-Stranded; D004265:DNA Helicases / Q000235:genetics / Q000378:metabolism*; D004260:DNA Repair; D004261:DNA Replication; D045566:DNA, Cruciform; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D005199:Fanconi Anemia / Q000235:genetics / Q000378:metabolism; D005785:Gene Conversion; D005800:Genes, Fungal; D006801:Humans; D009154:Mutation; D011995:Recombination, Genetic; D012568:Schizosaccharomyces / Q000235:genetics* / Q000378:metabolism*; D029702:Schizosaccharomyces pombe Proteins / Q000235:genetics / Q000378:metabolism*
D045566:DNA, Cruciform; D004271:DNA, Fungal; D029702:Schizosaccharomyces pombe Proteins; C518295:FANCM protein, human; D004265:DNA Helicases