Recent advances in quantum biology and DNA nanotechnology suggest that quantum coherence and phase-aligned entanglement may play a fundamental role in stabilizing DNA structures beyond the canonical double helix. This paper proposes that phase-aligned entanglement can facilitate the formation and stabilization of DNA triple helices (triplex DNA), particularly in the presence of Hoogsteen-bonded third strands involved in gene targeting and regulatory modulation. We explore the conditions under which quantum coherence between complementary and third strands allows for a stable triplex state, drawing from empirical data on triplex-forming oligonucleotides (TFOs), synthetic enhancer RNAs, and DNA-graphene hybrid quantum interfaces. Our model integrates entanglement fidelity, spin coherence, and π–π stacking interactions, offering new insights into triplex applications in epigenetic therapy, biosensing, and programmable genome editing.

1. Background and Molecular Basis of Triple Helix Formation

Triplex DNA involves the interaction of a third strand, typically rich in purines or pyrimidines, with a Watson–Crick duplex. It binds via Hoogsteen base pairing, forming T·AT or C·GC⁺ triads under slightly acidic conditions or with synthetic modification [2,4,14]. Applications include gene silencing, site-specific recombination, and chromatin remodeling [5,15,16]. Despite its promise, triplex DNA is often transient, with poor in vivo persistence. Enhancing triplex stability has relied on chemical modification of oligonucleotides, incorporation of peptide nucleic acids (PNAs), or tethering via nanoparticles [7,17].

2. Quantum Coherence and Phase-Aligned Entanglement in DNA Systems

Quantum coherence—the preservation of wavefunction phase across spatially or temporally distributed systems—is emerging as a key feature of biomolecular processes [8,18]. Phase-aligned entanglement refers to the synchronization of quantum states such that interaction energy and probability distributions remain coherent, even across separate molecular domains [9,19]. Experimental systems involving DNA-graphene hybrids have demonstrated entanglement-preserving π–π stacking, electron spin transport, and non-classical photonic behavior [11,20,21]. These features have already been used to model DNA as a spin network or Bloch-sphere logic lattice, offering fault-tolerant logic behavior in quantum computation [22–24].

3. Proposed Model: Triple Helix Stabilization via Entanglement

We propose that a triple helix can be stabilized if:

• The Watson–Crick duplex is entangled with a third strand through spin-correlated hydrogen bonds.
• The π–π orbital stacking across all three strands is enhanced via a graphene-based scaffold.
• The phase correlation between complementary bases (A–T, G–C) and the third strand base is maintained using synthetic enhancer RNA or TFO with quantum entanglement potential.

Triplex stability is improved when the third strand aligns in phase with the duplex, minimizing decoherence through quantum synchronization across the molecular lattice [19,24].

4. Mechanisms for Engineering Phase-Aligned Entanglement

• Graphene-DNA interfaces promote spin preservation and π–π orbital coherence [20,25].
• DNA polymerases functioning under spin-coherent conditions can propagate entangled states during strand synthesis [26].
• Triplex-forming oligonucleotides (TFOs) engineered with magnetic labels or quantum dots can serve as spin-encoded qubits, enabling direct monitoring of entanglement fidelity [27,28].
• Enhancer RNAs (eRNAs) may act as biological third strands with embedded regulatory logic and entanglement alignment [13,29].

5. Applications and Implications

Therapeutics: Triplex DNA stabilized by entanglement can be used to silence genes epigenetically or block transcription factors [4,15,30].

Biosensing: Entangled triplexes integrated into nano-electronic platforms allow high-sensitivity detection of genomic states [20,31].

Quantum Genomics: The model offers new directions for quantum memory encoding in DNA, enabling hybrid biological-computational architectures [23,32].

Synthetic Biology: Triplex-based control systems could function as logic gates, regulated by quantum coherence rather than classical chemical equilibrium [24,33].

Phase-aligned entanglement introduces a new quantum-mechanical pathway for stabilizing DNA triple helices. This model suggests that third-strand binding can be enhanced through spin-aligned π–π interactions, templated coherence, and quantum-assisted polymerase extension. By engineering triplex-forming DNA to participate in entangled quantum networks, a novel class of programmable, biologically relevant, and quantum-stable nucleic architectures can be realized.

There is no conflict of interest.