Abstract: Embodiments of a system, method, and kit for visualizing a nucleus are disclosed. A tissue sample is pretreated with a protease to permeabilize the nucleus, and then incubated with a nanoparticle/DNA-binding moiety conjugate. The DNA-binding moiety includes at least one DNA-binding molecule. The conjugate binds to DNA within the nucleus, and the nanoparticle is visualized, thereby visualizing the nucleus. Computer and image analysis techniques are used to evaluate nuclear features such as chromosomal distribution, ploidy, shape, size, texture features, and/or contextual features. The method may be used in combination with other multiplexed tests on the tissue sample, including fluorescence in situ hybridization. Kits for performing the method include a protease enzyme composition, a nanoparticle/DNA-binding moiety conjugate, and a reaction buffer.

Abstract: This disclosure relates to compositions that enhance the deposition of detectable moieties on tissue samples, methods utilizing these compositions and kits including these compositions. The compositions include a deposition enhancer having a formula where R1, R2, R3, and R4 are independently selected from aliphatic, aryl, halogen, a heteroatom-containing moiety, and hydrogen; R1 and/or R3 can be bound to R2 to form a fused, aromatic ring system; R5 is selected from a heteroatom-containing moiety; A is selected from, a carbon atom, a heteroatom, other than sulfur, and any combination thereof; n is 1-5, an enzyme, a specific binding moiety and a detectable moiety.