DNA-hydroxyapatite complex (DNA-HAp)

DNA adsorbed to hydroxyapatite surfaces refers to a biomolecular-mineral complex rather than a discrete therapeutic target such as a receptor or enzyme. Hydroxyapatite (HAp), the primary inorganic constituent of human bone and teeth, possesses a high affinity for the negatively charged phosphate backbone of DNA, primarily through electrostatic interactions with calcium ions (C-sites) on the crystal surface (Okazaki et al., 2001; ScienceDirect). This interaction is a cornerstone of hydroxyapatite chromatography, a technique used to purify nucleic acids and proteins by exploiting their varying affinities for the mineral surface (Gorbunoff, 1984). In medical research, HAp-DNA complexes are extensively studied as non-viral vectors for gene therapy and bone tissue engineering, where the HAp serves as a biocompatible scaffold that protects DNA from enzymatic degradation and facilitates cellular uptake (Tofighi et al., 2005; Journal of Materials Chemistry). Furthermore, the adsorption of DNA to HAp is critical in forensic science and paleontology, as it explains the long-term preservation of genetic material within skeletal remains (Brundin et al., 2013). Because it describes a physical state or a delivery system rather than a biological molecule whose activity is modulated by drugs, it is not classified as a traditional drug target.

Other names

DNA adsorbed to hydroxyapatite surfacesHydroxyapatite-bound DNADNA-HAp interactionNucleic acid-hydroxyapatite complex

The complex functions as a delivery vehicle or purification medium where DNA phosphate groups adsorb to calcium sites on the hydroxyapatite surface via electrostatic interactions and coordination bonding (Gorbunoff, 1984; Okazaki et al., 2001).