Practice question

Chromatin Immunoprecipitation time course following double-strand break induction provides insight into protein recruitment dynamics. Exclusive detection at break site initially reflects damage recognition. Subsequent detection both at break and one kilobase away after thirty minutes demonstrates progressive propagation along flanking chromatin. Such pattern indicates spreading of binding activity, oligomerization along DNA, recruitment of secondary repair factors or extension of chromatin modifications like gamma-H2AX domain. Transient binding would show disappearance, replication would involve synthesis markers. Spreading behavior typifies checkpoint mediators coordinating extensive chromatin regions for homologous recombination repair.