A tick. A mouse. A gene. What could go wrong?
I WATCHED AND THOUGHT PLEASE ASK THE QUESTION
I watched 60 Minutes this Sunday. They were on Nantucket Island, where scientists are genetically modifying white-footed mice to be resistant to the bacteria that causes Lyme disease. The idea is that if the mice can't carry the pathogen, the ticks that feed on them can't spread it to humans.
I have four grandchildren. We spend a lot of time outside. Lyme disease is no longer someone else's problem.
On the surface, it sounds like the most reasonable thing in the world. Lyme disease is brutal. It is under-diagnosed, under-treated, and life-altering for the people who get it and can't get rid of it. I understand why this research exists. I understand the urgency. And I understand the seduction of the technological fix. Technology is the sexy fix.
But I kept sitting with the question that nobody on the broadcast asked.
Are we walking in with a solution before we've finished asking the question?
What does the system already know?
I wondered how they got there. I did a bit of research.
The whole crisis on that island traces back to a single decision in 1926, when the community voted to bring two female deer to the island to keep a lone buck company. The deer population grew. The ticks that feed on deer grew with it. The rest followed. One small, well-intentioned act rippled into a century of consequences.
There is another layer to this. People on Nantucket were already calling it the Nantucket flu long before scientists had a name for it. The island was ground zero before anyone understood what was spreading. The bacterium has been here for sixty thousand years. What changed was the balance.
UNINTENDED CONSEQUENCES
Here is what I have learned — not in a laboratory, but in gardens, in living sculptures I have spent years building and tending and learning from: nature is not a problem to be solved. It is a relationship to be understood. And when we skip the understanding and go straight to the intervention, the intervention tends to produce consequences that take years — sometimes decades — to fully reveal themselves.
We have a word for it now. Unintended consequences. It has become so common a phrase we stopped hearing it.
It is time to hear it again.
PULLING THE THREAD
When you release a genetically modified organism into a wild ecosystem, you are not making one change. You are pulling a single thread in a fabric whose full complexity you cannot see — because no one can. The relationships between species in a functioning ecosystem are not linear. They are not predictable in the way a software update is predictable. They branch and loop and feed back on themselves across seasons and generations and multiple layers of soil.
The white-footed mouse is not just a Lyme vector. It is food. It is seed disperser. It is prey for foxes, owls, hawks, and snakes. It is a piece of an intricate puzzle that the island's food web has been assembling for centuries. When you genetically alter a species and release it into that web, you are not just changing what that species does to a tick. You are changing what that species does to everything it touches — and everything those things touch in turn.
We do not know what that is yet. We genuinely do not know.
That uncertainty alone should slow us down.
The scientists on Nantucket are brilliant at what they do. They just aren't reading Grandin. They aren't reading Carson. Different silo. The genome cares.
I LEARNED FROM TEMPLE GRANDIN
The clearest warning comes not from an environmentalist but from Temple Grandin.
She points to a Russian experiment that began in the 1950s. A geneticist named Belyaev set out to breed foxes for a single trait — tameness. Within a few generations the foxes were calmer. But simultaneously, without anyone selecting for them, other changes appeared: floppy ears, curled tails, white facial blazes, spotted coats. Nobody chose those traits. They came along for the ride. The genome, it turns out, does not honor our categories. Change one thing and the effects are linked to things you cannot predict.
Then there is what happened to the chickens. The broiler industry selected hard for large breast muscles and fast growth. Before the 1990s, what followed had never been seen. Roosters began attacking hens — violently, injuring and killing them. The normal courtship behavior had simply vanished somewhere in the selection process, and something dangerous had taken its place. It spread from one strain to nearly all strains within just a few years. Nobody planned it. Grandin writes that nobody knows exactly why it happened. Commercial broad-breasted turkeys were pushed so far in the same direction that they can no longer breed naturally at commercial scale. The entire industrial turkey industry now depends on artificial insemination. One trait selected. An entire behavior system dismantled.
RACHEL CARSON WARNED US
Ask any Texan over fifty where the horned toads went. My brother and I used to find them in the desert. They were so gentle they would sit still in your hands. Then fire ants arrived — stowaways in the soil used as ships' ballast, introduced through the Port of Mobile in the 1930s. At first they were a manageable problem. Native ant species were already fighting a low intensity war against them. The system was handling it. Then the chemical industry and the USDA decided to make fire ant eradication a program. They aerially sprayed DDT and other pesticides across the South — killing not just fire ants but the native ant species that had been competing with them. Rachel Carson wrote about it in Silent Spring. The pesticides didn't eradicate the fire ants. They toughened them. With their natural competitors eliminated, fire ants flourished and spread to more states than ever. The USDA quietly ended the program in the early 1970s, admitting the ant mounds were not a serious obstacle to farming after all. The intervention created the crisis it claimed to be solving.
Carson went further. The fire ant program was not born from evidence of actual damage. It was born from manufactured hysteria — and a pesticide industry that needed a market. The fire ant became the villain because someone needed to sell the cure.
Fire ants outcompeted and displaced the native harvester ants that horned lizards depend on for food. The horned lizard population collapsed across the state within decades. Nobody released fire ants to kill horned toads. The effects rippled through the food web in a direction no one predicted, erasing a creature that had been part of this landscape for centuries.
A staple of my childhood. Gone.
SEEING IN SYSTEMS
What I keep thinking about, watching the Nantucket story, is this: before the genetic modification, did anyone seriously study what is out of balance? Could the answer be as simple as returning a predator? Foxes eat mice. Owls eat mice.
The science backs this up in ways that should stop the experiment cold and give us all hope and faith in the natural world. Ironically, 60 Minutes already told this story. In 2020 they covered the reintroduction of wolves to Yellowstone National Park. When wolves returned in 1995, coyote populations dropped by half — by as much as 80 percent in areas with established wolf packs. Fox populations recovered. The cascade moved through the entire ecosystem in ways still being studied thirty years later. One predator returned. The system began remembering.
That same chain applies to Nantucket. Researchers studying the spread of Lyme disease across the Northeast found that increases over the past three decades are frequently uncorrelated with deer abundance — and instead coincide with the decline of the red fox, pushed out of its territory by the expansion of coyotes. Where coyotes dominate, foxes disappear. Where foxes disappear, mice multiply. Where mice multiply, infected ticks follow. The Cary Institute's Richard Ostfeld puts it plainly: certain predators protect our health. Manage the environment so healthy predator populations can exist, and Lyme disease rates fall.
Nobody needed a genetics lab for that insight. The system lives it.
Digging deeper — Opossums. Nearly two decades of field research finds they are one of the most effective natural checks on tick populations — not because anyone designed them for it, but because of how they live. They groom obsessively, killing ticks that land on them. And because ticks are drawn to opossums the way they are drawn to mice, the ticks that choose an opossum instead of a mouse never acquire the Lyme bacteria — they die on the wrong host. Opossum populations have been declining across the Northeast as habitat shrinks and road mortality rises. Now that is a lead story!
Hawks, owls, kestrels. The predators that keep mouse populations in check — reducing the host population through biology rather than modification. The question is not whether they could help. The question is whether we have given them the habitat they need to do it.
None of these approaches require us to change the genome of a wild animal and release it into a living system we cannot fully predict.
White-footed mice don't just carry Lyme disease. They live underground — in burrows dug by other animals, in root cavities, in the hollow spaces the island's soil has accumulated over centuries. When they vacate those spaces, other species move in — including native bumblebees that depend on these same underground spaces to nest and reproduce. What happens when the DNA left behind in those burrows belongs to a genetically modified animal? Nobody has studied it. We have to ask.
In my work, I have learned to sit still long enough for the living world to forget I am there. It is what I mean when I write about seeing in systems — the discipline of looking before intervening. What I see when I do that is not disorder. It is a conversation already underway. Relationships I didn't design, couldn't have predicted, and would have disrupted if I had reached in too fast.
The white-footed mouse has been in relationship with that island's food web for a very long time. The tick with the mouse. The Lyme bacteria with the tick. Something changed — in the landscape, in the predator population, in the human encroachment on the habitat — that allowed the disease to expand. The system is showing us where the imbalance is.
Genetically modifying the mouse answers a symptom. Restoring the system addresses the cause.
THE SAFER PATH
A tick. A mouse. A gene. What could go wrong? Everything.
That science is cool. It is sexy. It has to wait. There is no going back once you have rewritten a genome and released it into the wild. The safer path is simpler and older — give nature what it needs to find its own balance. Remove whatever is preventing the predators from returning. Restore what the island once knew.
Not sexy. But beautiful in a way sexy will never be.
The system remembers. We just have to get out of its way.