Energy, Light and Living Systems

How energy, molecular arrangement, and accessible potential shape DNA repair and mitochondrial function

A Back to Center research white paper

Author: Tina Krajacic Copyright All Rights Reserved

Overview. Living systems cannot build or repair DNA with energy alone. They require the right molecular building blocks, available chemical energy, accessible pathways, properly positioned proteins, and coordinated responses. Studies of DNA synthesis, mitochondria–nucleus contacts, chromatin-associated metabolism, and light-assisted repair reveal a common practical lesson: what energy can accomplish depends on the receiving relationships.  This white paper interprets published research and identifies open scientific questions. It does not describe a new clinical intervention or report original laboratory experiments.

1. Beyond the incoming frequency

ROY G BIV is a familiar way of naming colors across the visible spectrum, but visible light forms a continuous range of wavelengths rather than seven separate physical compartments. Wavelength influences photon energy; it does not, by itself, determine whether a cell absorbs light, what molecular pathway responds, or whether a response is helpful.

The same distinction applies beyond the visible spectrum. An emitted signal is not necessarily an absorbed signal. Absorption is not necessarily biological action. Biological activity is not necessarily repair. A meaningful result requires evidence of what happened to the receiving system and whether its function improved.

In this context, Potential means the changes that are physically and biologically accessible under the actual conditions—not simply the energy present in the surroundings. The receiver matters as much as the source.

2. DNA construction: distinguish the energy in building blocks from the energy used by the cell

Before discussing light or repair, we must ask how DNA is assembled. In ordinary DNA replication and laboratory PCR, DNA polymerases extend a growing strand by incorporating deoxyribonucleoside triphosphates (dNTPs). Each incorporation uses the activated incoming nucleotide and releases pyrophosphate. Further breakdown of pyrophosphate helps favor forward synthesis. RNA synthesis uses related ribonucleoside triphosphates (NTPs). [8, 9]

This is not identical to saying that ATP directly powers every bond formed in a growing DNA strand. The incoming dNTP supplies the chemical driving force for incorporation, while ATP and other cellular resources support numerous other steps—including DNA unwinding, chromatin remodeling, signaling, and repair. The distinction matters: having energy available in one chemical form does not guarantee it can perform another task. [8, 9]

In our plain-language approach, the potential to build a DNA strand depends on an arranged relationship: an appropriate template, the correct incoming building blocks, an active enzyme, suitable chemical conditions, and processes that keep synthesis moving forward. An inventory of ingredients is not the same as a working pathway.

3. Mitochondria and nucleus: how energy availability becomes a working relationship

Mitochondria supply substantial cellular ATP through oxidative phosphorylation, while glycolysis and certain locally operating pathways also contribute. The balance varies by cell type and condition. Most human cells also contain mitochondria with their own small genome, mtDNA, inherited predominantly through the maternal line. This genome encodes essential components of the oxidative-phosphorylation system, although most proteins used by mitochondria are encoded in the nuclear genome.

A June 2026 Nature study identified a direct molecular contact between the outer mitochondrial protein VDAC1 and the nuclear pore protein RANBP2. Disrupting their interaction in experimental systems reduced mitochondria–nucleus proximity and lowered nuclear ATP and phosphocreatine levels, alongside changes in nuclear signaling and gene-regulatory pathways. The findings support an important connection between organelle arrangement and nuclear energy availability. They do not mean that every nuclear ATP molecule passes through one uniquely established channel. [10]

A second March 2026 Nature Communications study identified hundreds of metabolic enzymes associated with chromatin across healthy and cancerous human samples. The arrangement was tissue-dependent, and several folate-pathway enzymes showed links to the DNA-damage response. This is more than saying that the nucleus receives energy from somewhere else: the nucleus itself contains metabolic proteins whose location may shape its response. Crucially, finding an enzyme on chromatin does not prove that it carries out its ordinary metabolic reaction there; its precise structural, regulatory, or catalytic role requires individual testing. [11]

Local energy supply is also not just theoretical. Earlier research showed a NUDIX5-dependent pathway for ATP production inside the nucleus in a specific hormone-responsive cell model, where that ATP supported chromatin remodeling. This is a context-specific result, not proof that every cell makes nuclear ATP in the same way. [12]

Remove the face. Rather than begin with organelle names, ask: Where does usable energy arise? Through which relationships does it become accessible? What receives it? Which task becomes possible? How is the result independently verified? These are the questions behind Potential. An energy-rich cell can still fail to repair a lesion if the required molecular access, enzyme, timing, or downstream response is missing.

4. DNA repair: a direct, measurable connection between light and molecular arrangement

A particularly clear example comes from photolyase, an enzyme used by many organisms to repair a specific class of ultraviolet-induced DNA lesions called cyclobutane pyrimidine dimers (CPDs). Photolyase absorbs suitable light through a molecular cofactor and uses that energy to reverse the lesion. The repair requires the enzyme, the lesion, an appropriate light input, and access to the damaged site. [1]

In a 2025 study of yeast, researchers measured approximately 92% CPD repair after 60 minutes in cells receiving photoreactivating light, where both photolyase and ordinary repair pathways could operate. Cells kept in the dark, relying on other repair pathways, repaired approximately 16% over the same period. The comparison documents a specific light-assisted repair mechanism—not a general claim that illumination repairs all forms of DNA damage. [1]

The study also demonstrated why arrangement matters. DNA is packaged around proteins into chromatin. Sites buried within nucleosomes or occupied by particular DNA-binding proteins were less accessible to photolyase than more exposed sites. Even with a relevant enzyme and light available, the local molecular relationship changed which lesions could be repaired readily. [1]

This is an important boundary for human health. Human cells do not naturally use the same photolyase pathway; they rely on other DNA-repair systems, including nucleotide excision repair, to remove UV lesions. The yeast findings must not be presented as evidence that shining light on a person can repair their DNA mutations. [1, 2]

5. The repair pathway matters as much as the damage signal

Repair is more than detecting that something is wrong. Human-cell experiments involving the DNA-repair protein SNM1A show that a molecular component can be important for resolving particular complex DNA breaks. Removing its activity can impair repair-associated responses and cell survival under relevant conditions; restoring a functional version can improve specific outcomes. Yet a protein reaching the damaged site does not automatically mean it performed the needed repair. [3]

That distinction is central to the Back to Center question: Did the system respond to correction—and did the response restore the function that mattered? A change in a DNA-damage marker is informative, but it is not equivalent to proof of error-free sequence restoration or healthy long-term function.

6. DNA shape, handedness, and what the spectrum can reveal

DNA is not limited to one shape. Common B-DNA is a right-handed helix; under particular chemical and sequence conditions, DNA can adopt the left-handed Z-DNA conformation. Researchers use circular dichroism, which measures differences in the absorption of left- and right-circularly polarized light, to investigate such molecular structures. A 2026 study explored how binding to an anti-Z-DNA antibody fragment influenced the B-to-Z transition. [4]

This is a measured connection between optical polarization, molecular structure, and the surrounding chemical relationship. But it must not be confused with DNA repair. A changed optical spectrum can indicate a changed structure without showing that a harmful mutation was corrected. Nor does DNA's helical form mean that DNA itself is an electromagnetic wave.

7. Mitochondria: changing a relationship can change cellular function

Mitochondria are not static energy containers. They continually interact with other cellular structures, respond to changing demands, and undergo cycles of division and fusion. Their work is closely related to the availability of ATP, the molecule used to transfer usable chemical energy into many cellular tasks.

An illuminating 2022 experiment used light-responsive proteins engineered into cultured cells to bring mitochondria and lysosomes into closer contact. Blue light changed those contacts, encouraged mitochondrial division, and partially restored mitochondrial function in a specific model with impaired mitochondrial dynamics. The effect depended on the engineered receiving proteins and the organelles' arrangement; light alone did not produce the same result. [5]

The researchers measured improved oxygen consumption and ATP in their SLC25A46-deficient engineered cell model, reporting respiration restored to approximately 80% of a wild-type reference under the tested conditions. This is a context-specific functional finding, not a guarantee that inducing additional mitochondrial division helps every cell. More movement or a larger response is not automatically better function. [5]

This experiment did not show that light corrected a mitochondrial DNA sequence; the affected gene in this model is nuclear-encoded. Functional recovery and genetic correction are distinct questions.

8. Mitochondrial DNA: what changed, and at what level?

Mitochondria contain their own DNA, often present in many copies. When different mitochondrial DNA variants coexist, the mixture is called heteroplasmy. A change in the proportion of variants may reflect chance, altered replication, selective survival of organelles, or changes in the numbers of whole cells and their descendants.

A 2024 Nature study demonstrated that mitochondrial variant behavior depended on the mutation, the metabolic environment, and cell-lineage selection. A population could show a falling proportion of a variant partly because cells carrying more of that variant became less common—not because individual mutant DNA molecules had necessarily been repaired or removed inside every cell. [6]

A separate 2026 study found a stress-associated increase in a measure related to mitochondrial DNA abundance in a particular cell model without comparable evidence that the distribution of mitochondrial DNA variants had changed. In other words, more mitochondrial DNA signal did not automatically mean healthier DNA or successful selection. [7]

These findings provide a powerful reason to distinguish the molecular, organelle, cellular, and whole-organism levels. The same visible outcome can conceal different histories. Conversely, different starting conditions can lead to different outcomes under the same disturbance.

9. The Back to Center perspective

We organize these observations through five everyday words:

Difference. What changed—light exposure, molecular damage, genetic variant, metabolic demand, or environmental condition?

Relationship. What actually connects the source to the receiver, and which biological partners are needed for a response?

Potential. Which responses are possible and accessible in the present molecular and cellular conditions?

Change. What was observed—absorption, structural movement, lesion removal, respiration, or altered cell populations?

New Form. What is the resulting state, what function is independently verified, and how does that state shape the next response?

Three complementary pictures help make the questions understandable. Russian Doll reminds us that proteins sit within organelles and cells, cells within tissues, and each level can constrain the next. Symphony reminds us that multiple influences operate together rather than one isolated input always controlling the outcome. Snowflake reminds us that recurring processes need not produce identical results, and similar outward appearances may hide different internal arrangements and histories.

These are organizing perspectives, not substitutes for biochemistry, genetics, optics, or a validated medical treatment. They help us ask which relationships matter and what evidence would distinguish an actual improvement from a change that only looks promising.

10. ATP, MRI, and the difference between observing and restoring

Two familiar examples clarify the distinction. ATP illustrates that an energy carrier is useful only when the correct biochemical relationships can perform work. DNA polymerization itself commonly uses the activated chemistry of incoming dNTPs, while other repair and nuclear tasks have separate energy requirements. MRI uses magnetic resonance and measured signals to reconstruct images of tissues; acquiring an image is not the same as correcting the tissue's underlying condition.

In the same way, a DNA spectrum may reveal a structural difference without demonstrating genetic repair, and a mitochondrial shape change may be measurable without establishing restored ATP delivery or durable cellular health.

11. What remains to be established

Published research supports the separate roles of activated DNA building blocks, mitochondrial and nuclear energy relationships, light-assisted DNA repair, light-controlled organelle interactions, and context-dependent mitochondrial DNA dynamics. It does not yet establish a universal wavelength for healing, a method for correcting any mutation with light, or a single physical mechanism shared by every biological system.

The most useful next questions are therefore limited and measurable: When an established repair pathway is present, how does molecular accessibility influence verified lesion clearance? When organelle contacts change, does the cell actually regain adequate energy production and recovery capacity? And when mitochondrial DNA proportions shift, was a molecule repaired, an organelle altered, or a cell lineage selected?

Answering these questions requires independent biological measurements and appropriate comparisons with established scientific explanations. They cannot be settled by a visual similarity, one spectrum, a single activity marker, or an isolated simulation.

Conclusion: the relationship determines what becomes possible

The important lesson is not that every living system responds to light in the same way. It is that energy supply is not the same thing as accessible biological potential. Material properties, molecular partners, structure, access, timing, cellular history, and functional demands determine which responses are possible.

In DNA construction, activated nucleotides and ATP-dependent supporting processes have distinct roles. In human cells, mitochondrial contacts and chromatin-associated metabolism help explain why where and how energy becomes accessible matters. In yeast, a specific enzyme uses light to repair certain DNA lesions, with chromatin arrangement affecting access. In engineered cells, light-controlled organelle contacts can improve a measured mitochondrial deficit. In mitochondrial genetics, changes in variant frequencies can reflect selection among cells rather than direct correction of DNA molecules.

Together, these studies support a practical way of asking scientific questions: Difference → Relationship → Potential → Change → New Form. The aim is not simply to observe change, but to learn whether the change preserves or restores the function of the whole system.

Scientific references

Bohm KA, Laughery MF, Mieczkowski PA, Roberts SA, Wyrick JJ. “Genome-wide maps of UV damage repair and mutation suppression by CPD photolyase.” Nucleic Acids Research 53 (2025): gkaf495. https://doi.org/10.1093/nar/gkaf495

Li YF, Kim ST, Sancar A. “Evidence for lack of DNA photoreactivating enzyme in humans.” Proceedings of the National Academy of Sciences 90 (1993): 4389–4393. https://doi.org/10.1073/pnas.90.10.4389

Swift LP, et al. “SNM1A is crucial for efficient repair of complex DNA breaks in human cells.” Nature Communications 15 (2024): 5392. https://doi.org/10.1038/s41467-024-49583-5

Lee C-C, et al. “Structural basis of B-to-Z DNA transition mediated by an anti-Z-DNA antibody.” Nucleic Acids Research 54 (2026): gkag160. https://doi.org/10.1093/nar/gkag160

Qiu K, et al. “Light-activated mitochondrial fission through optogenetic control of mitochondria–lysosome contacts.” Nature Communications 13 (2022): 4303. https://doi.org/10.1038/s41467-022-31970-5

Kotrys AV, et al. “Single-cell analysis reveals context-dependent, cell-level selection of mtDNA.” Nature 629 (2024): 458–466. https://doi.org/10.1038/s41586-024-07332-0

Hsieh Y-H, et al. “Single-cell multi-omic analysis of mitochondrial mutational mosaicism and dynamics.” Nature Communications 17 (2026): 2532. https://doi.org/10.1038/s41467-026-70399-y

Cooper GM. “DNA Replication.” The Cell: A Molecular Approach, 2nd ed. NCBI Bookshelf (2000). https://www.ncbi.nlm.nih.gov/books/NBK9940/

Burke CR, Lupták A. “DNA synthesis from diphosphate substrates by DNA polymerases.” Proceedings of the National Academy of Sciences 115 (2018): 980–985. https://doi.org/10.1073/pnas.1712193115

Menendez-Montes I, et al. “Mitochondria directly interact with the nuclear pore complex.” Nature 654 (2026): 786–797. https://doi.org/10.1038/s41586-026-10588-3

Kourtis S, Gañez Zapater A, Elbæk C, et al. “Native chromatome profiling reveals hundreds of metabolic enzymes in the nucleus across tissues.” Nature Communications 17 (2026): 1655. https://doi.org/10.1038/s41467-026-69217-2

Wright RHG, et al. “ADP-ribose-derived nuclear ATP synthesis by NUDIX5 is required for chromatin remodeling.” Science 352 (2016): 1221–1225. https://doi.org/10.1126/science.aad9335

Scientific scope: This is an educational interpretation of published research. It reports no new clinical trial, validated DNA-repair treatment, or evidence that illumination alone corrects human or mitochondrial DNA mutations. It is not medical advice.

BACK TO CENTER • NOVEMBER 2026 |