Ancient proteins offer new path to dinosaur genetics, scientists say

The Jurassic Park fantasy has always hinged on a single, tantalizing premise: that DNA could survive long enough in amber or preserved tissue to be extracted and read. In 1993, the year Steven Spielberg's film arrived in theaters, that premise seemed to shift from pure fiction toward plausible science when researchers announced they had recovered DNA from a weevil trapped in amber for 120 to 135 million years. The boundary between what was possible and what was merely imagined suddenly felt permeable.

It didn't hold. Attempts to replicate the weevil results failed, and the original samples turned out to be contaminated with modern genetic material. Subsequent research made clear that DNA preserved in amber degrades far faster than anyone had hoped—typically within a few thousand years at most. The oldest high-quality human genomes recovered to date span only about 45,000 years. Push back further to hominin remains from 430,000 years ago, and the DNA fragments become so small and scattered that reconstructing anything resembling a complete sequence becomes impossible. Like all organic matter, DNA breaks down over time, splintering into ever-shorter pieces that carry less and less usable genetic information.

Cold has proven to be DNA's best ally. The Arctic and subarctic regions, where temperatures remain low year-round, have yielded the oldest genetic samples on record. A mammoth tooth excavated from Siberian permafrost, preserved for at least 1.2 million years, produced fragments large enough to illuminate the species' evolutionary history. Even older material has surfaced in Greenland, where sediment deposited roughly two million years ago contained environmental DNA—genetic material shed by living organisms and then bonded to minerals like clay and quartz, which slowed its decay. Though these fragments are tiny, they were numerous enough for researchers to identify the flora and fauna of that ancient landscape: mastodons, reindeer, hares, rodents, geese, and horseshoe crabs. The Greenland samples remain the oldest DNA found anywhere on Earth, though scientists suspect eastern Antarctica, with ice formations spanning eight million years, might yet yield older material.

But the real breakthrough may not require DNA at all. Proteins—the biological chains of amino acids that DNA instructs cells to build—degrade far more slowly than the DNA molecules themselves. If you can determine the order of amino acids in an ancient protein, you can work backward to infer the genetic sequence that originally coded for it. In 2025, researchers put this principle to work on an Arctic rhinoceros that lived 21 to 24 million years ago. By analyzing proteins preserved in the animal's tooth enamel, they extracted genetic information from a specimen ten times older than any previous DNA recovery. The animal had been dead for roughly twenty-two million years, yet its proteins still held readable genetic secrets.

This shift from DNA to proteins may not resurrect dinosaurs—the oldest dinosaur remains are 66 million years old, and proteins likely cannot survive that long even under ideal conditions. But it opens a new frontier in paleogenomics. The genetic information locked in ancient proteins could illuminate the evolutionary relationships, adaptations, and biology of creatures from millions of years in the past, far beyond what direct DNA analysis could ever reach. The gap between what we can know and what we once thought forever lost has widened again, this time in a direction that science, not fiction, has opened.