Do-it-yourself genetic sleuthing

But this is no manhunt. Aull is scouring her own genes in pursuit of a potentially lethal mutation that she may have inherited from her parents - and she has transformed her bedroom closet into a makeshift scientific laboratory to conduct the hunt.

The 23-year-old MIT graduate uses tools that fit neatly next to her shoe rack. There is a vintage thermal cycler she uses to alternately heat and cool snippets of DNA, a high-voltage power supply scored on eBay, and chemicals stored in the freezer in a box that had once held vegan "bacon" strips.

Aull is on a quirky journey of self-discovery for the genetics age, seeking the footprint of a disease that can be fatal but is easily treated if identified. But her quest also raises a broader question: If hobbyists working on computers in their garages can create companies such as Apple, could genetics follow suit?

"We have a long way to go," Aull said. "But certainly in the short term, I'd like to show people how to do this, how to do it safely, and that you can do this."

Aull, a former research associate at the now-defunct biotech company Codon Devices, doesn't expect everyone to approach genetics with her same attitude. But with startup companies already gambling that knowing your genes could become as routine as a blood-pressure test, she figures, why not test the theory?

She has the attention of George Church, a Harvard Medical School genetics professor who was a pioneer of the Human Genome Project and a co-founder of Codon Devices, and who is now leading an effort to sequence the DNA of 100,000 people. Aull is one of his former students.

"Can genetics map onto electronics - is it ready to go into the garage shop in a hobbyist sense?" said Church. "That's the question she's asking, and I think that's a very big, profound question. . . . There seems to be a very deep and growing curiosity about genetics that might dwarf electronics. No matter how much we love our gadgets, we're totally fascinated by our ancestry and health."

Aull's quest began with her father, Ken Aull, who began to get sick a few years ago, when he was 58. His blood pressure spiked, and he had back pain and signs of liver problems.

The elder Aull, an engineer, went through a battery of tests, including a genetic test that revealed he had hemochromatosis, in which iron builds up in the body. He turned to his daughter, a biologist in training, for more insight.

Katherine Aull sifted through the data and saw that her father had mutations on each copy of one of his genes. Together, they gave him hemochromatosis, a potentially fatal disease with a simple treatment: have blood drawn regularly.

Today, with treatment, her father is fine, but she has been left wondering about herself. Each person inherits two copies of each gene: one from their mother and one from their father. Aull knows she must have inherited one mutant gene from her father. But it takes two mutant genes to cause hemochromatosis. The question is whether she inherited another from her mother.

Instead of going to a doctor to do the test, she recently prepared her samples by swabbing her cheek with a Q-tip and scraping the cells into a tube. Then, she dangled the tube in a pot of boiling water on her kitchen stove.

"For so many people, biology is something scary that takes place in a lab," Aull said. "This shows people it's understandable, and part of your life. . . . You can do it with basic kitchen equipment."

To the tube, Aull added compounds that are specifically designed to isolate the fragments of DNA that could hold either normal genes or mutations. Then, she loaded the stovetop samples into her thermal cycler, a piece of lab equipment that noisily and rapidly ramps the temperature up and down, to create many copies of bits of DNA that could carry the mutation.

When her samples were ready, Aull loaded them into a gel in a plastic box and hooked it up to a high-voltage power supply. The DNA moved across the gel. Later, in the glow of an intense blue light, she watched bands of DNA light up, revealing which mutations lie within her genes.

So far, Aull's initial experiment indicates that she carries two mutant genes. She is repeating the experiment to check her results and eventually plans to get a professional test.

Beyond getting the experiment to work, the big questions hanging over home biology experiments right now include safety and determining how such amateur efforts will coexist with professional science, said Mackenzie Cowell, who is working to foster a biology community called DIYbio - for do-it-yourself biology - in Boston.

Keith Robison, a computational biologist who worked at Codon Devices, urges caution to amateurs who may not understand the nuances of their self-experiments without the assistance of genetic counselors.

He took an example from his own life to describe the undue anxiety that can come from pursuing one's own genetic information. When he found out that someone in his wife's family was color-blind, he became "semi-obsessed" with calculating the probability his son might also be color-blind. Unlike color-blindness, many diseases are caused by a mix of factors, only one of which is genetics. So what kind of confusion could occur, Robison wonders, if people begin sifting through their genome and find a gene that "raises the risk [for a disease] in some complicated way we don't know how to understand?"

Even when scientists have pinpointed the genetic mutations that cause a disease, as they have done with hemochromatosis, some people who carry both mutant genes may develop no symptoms of the disease.

Patients should not take action without medical advice, said Cheryl Garrison, executive director of the Iron Disorders Institute, a nonprofit group that raises awareness about hemochromatosis.

"It's imperative they maintain a relationship with their doctor," Garrison said. "Before you take action on the results, make sure you get a medical partner."

Still, Aull is pushing forward.

Even if she confirms she has two mutant genes, symptoms of hemochromatosis probably won't strike for years. The added knowledge would alert her to watch for signs of the disease as she gets older. Also, if she has children, she may want her partner to be tested for the gene.

Ken Aull said his daughter seems to have inherited at least one other thing from him: "She's just a native engineer - taking science and striving to make it practical."

Carolyn Y. Johnson can be reached at cjohnson@globe.com.