DNA lesions

DNA lesions are physical or chemical injuries to the DNA molecule inside a cell, such as broken strands, chemically altered bases, or cross-links between strands. If these injuries are not repaired correctly before the cell divides, they can become permanent mutations that drive cancer or cause the cell to die.

Origin

"DNA" is short for deoxyribonucleic acid, the molecule identified as the carrier of genetic information by Avery, MacLeod, and McCarty in 1944 and structurally described by Watson and Crick in 1953. "Lesion" comes from the Latin laesio, meaning injury, and has been used in biology and medicine since the 19th century to describe any localized damage to tissue or, later, to molecules.

Significance in Asbestos Context

Asbestos fibers cause DNA lesions through two main routes: they generate reactive oxygen species (in part because iron on the fiber surface drives oxidative chemistry), and they physically interfere with cell division when fibers are engulfed by cells. The result is oxidized DNA bases, single- and double-strand breaks, and chromosomal damage, the kinds of injuries that, accumulated over decades, lead to mesothelioma and lung cancer. For patients, this mechanism matters because it explains why even relatively limited asbestos exposures can cause disease many years later, and it underpins expert testimony that asbestos is genotoxic (directly damaging to DNA) rather than acting only through indirect inflammation.

Example Sentence

The expert's report explained that asbestos fibers retained in the patient's lung tissue continued to generate DNA lesions for decades after his exposure ended, eventually producing the mutations that drove his mesothelioma.

Related Terms

Genotoxicity, Oxidative Stress, Reactive Oxygen Species, Carcinogenesis, Chromosomal Aberration, BAP1

Notes

• If your case involves disputes about causation, ask whether your legal team is working with an expert who can explain asbestos's direct genotoxic mechanism, not only inflammation-based theories.
• Preserve pathology slides and any tissue blocks from biopsies or surgeries; these can later be tested for asbestos-related genetic changes (such as BAP1 loss) that strengthen the link between exposure and disease.
• Ask your oncologist whether tumor genetic or molecular testing has been done. Results can inform both treatment options (including clinical trials) and the medical record supporting your claim.
• DNA damage from asbestos accumulates silently over decades, which is why disease can appear 20-50 years after exposure; this latency is medically expected and legally recognized.