Replication fork pausing is required to initiate a recombination events. More specifically, Swi1 is required for recombination near the mat1 locus. Swi3 has been found to co-purify with Swi1 Swi3, together with Swi1, define a fork protection complex that coordinates leading- and lagging-strand synthesis and stabilises stalled replication forks [1]. The Swi1-Swi3 complex is required for accurate replication, fork protection and replication checkpoint signalling [1,2]

1: Swi1 and swi3 are components of a replication fork protection complex in fission yeast. Noguchi E, Noguchi C, McDonald WH, Yates JR 3rd, Russell P; Mol Cell Biol 2004;24:8342-8355. PMID:15367656

2: swi1- and swi3-dependent and independent replication fork arrest at the ribosomal DNA of Schizosaccharomyces pombe. Krings G, Bastia D; Proc Natl Acad Sci U S A 2004; [Epub ahead of print] PMID:15371597