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Synaptonemal complex protein SYCP3 impairs mitotic recombination by interfering with BRCA2
Author(s) -
Hosoya Noriko,
Okajima Miyuki,
Kinomura Aiko,
Fujii Yoshihiro,
Hiyama Takashi,
Sun Jiying,
Tashiro Satoshi,
Miyagawa Kiyoshi
Publication year - 2012
Publication title -
embo reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.584
H-Index - 184
eISSN - 1469-3178
pISSN - 1469-221X
DOI - 10.1038/embor.2011.221
Subject(s) - biology , rad51 , meiosis , homologous recombination , synaptonemal complex , homologous chromosome , chromosome instability , genetic recombination , genetics , mitosis , microbiology and biotechnology , dna , chromosome , recombination , gene
The meiosis‐specific synaptonemal complex protein SYCP3 has been reported to be aberrantly expressed in tumours. However, in contrast to its well‐defined function in meiosis, its possible role in mitotic cells is entirely unknown. Here, we show that SYCP3 is expressed in a range of primary tumours and that it impairs chromosomal integrity in mitotic cells. Expression of SYCP3 inhibits the homologous recombination (HR) pathway mediated by RAD51, inducing hypersensitivity to DNA‐damaging agents such as a poly(ADP‐ribose) polymerase (PARP) inhibitor and chromosomal instability. SYCP3 forms a complex with BRCA2 and inhibits its role in HR. These findings highlight a new mechanism for chromosomal instability in cancer and extend the range of PARP‐inhibitor sensitive tumours to those expressing SYCP3.