ArticleMethods in molecular biology (Clifton, N.J.)2022
In Vitro Reconstitution of BRCA1-BARD1/RAD51-Mediated Homologous DNA Pairing.
Article in Methods in molecular biology (Clifton, N.J.), 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
RAD51-mediated homologous recombination (HR) is a conserved mechanism for the repair of DNA double-strand breaks and the maintenance of DNA replication forks. Several breast and ovarian tumor suppressors, including BRCA1 and BARD1, have been implicated in HR since their discovery in the 1990s. However, a holistic understanding of how they participate in HR has been hampered by the immense challenge of expressing and purifying these large and unstable protein complexes for mechanistic analysis. Recently, we have overcome such a challenge for the BRCA1-BARD1 complex, allowing us to demonstrate its pivotal role in HR via the promotion of RAD51-mediated DNA strand invasion. In this chapter, we describe detailed procedures for the expression and purification of the BRCA1-BARD1 complex and in vitro assays using this tumor suppressor complex to examine its ability to promote RAD51-mediated homologous DNA pairing. This includes two distinct biochemical assays, namely, D-loop formation and synaptic complex assembly. These methods are invaluable for studying the BRCA1-BARD1 complex and its functional interplay with other factors in the HR process.
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