John Janda inherited the mutated gene that stole his mother’s mind. He doesn’t have the disease, and doctors don’t know why — but a University of Washington professor has been studying the Jandas and other affected families for more than 35 years.

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MARBLEMOUNT, Skagit County — John Janda knows he takes after his mother.

At 68, the graying building contractor is sentimental, just like she was. He smiles indulgently as he shows off photos of his 9-month-old grandson; he tears up at the memory of losing his dad in a construction accident more than 40 years ago.

“I’m emotional,” he said. “I know I got that from her. They call that ‘a kind heart.’ That’s one of the best blessings there ever was.”

Along with the blessings, however, Janda inherited what many would call a curse: a genetic mutation that causes a devastating brain disorder known as frontotemporal dementia, or FTD.

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His mother, Lucille Janda, had the mutation and the disease, a relentless illness that ravaged her personality starting in her late 40s and eventually robbed her of the ability to think, speak and walk.

John Janda has the same mutation, doctors say. But unlike his mother, who died in 2014 at age 93, Janda has shown no sign of the disorder, more than 15 years after symptoms typically appear.

“I can’t tell you that I feel anything,” said Janda, a lifelong builder who operates a wood shop, metal shop, sawmill and lumber kiln on his remote property about 100 miles northeast of Seattle. “I could go on my job and do anything I did 25 years ago. The knowledge is still there. I’m still gaining information all the time.”

That makes him a medical mystery, a puzzle to scientists who can’t say why Janda has so far been spared his mother’s fate.

“The overwhelming majority of the people who have this mutation develop the disease, but there are a few who don’t,” said Dr. Thomas Bird, a University of Washington professor of neurology and medical genetics.

“We would love to know why. What a terrific clue that would be to treatment of the disease.”

Bird was part of the team that first identified the mutation in the MAPT gene, one of three now linked to FTD. He has been studying the Jandas and other affected families for more than 35 years. Last year, he published a paper in the American Journal of Medical Genetics detailing the family’s experience.

“John’s an outlier. He’s going to be 69 years old this summer and he’s doing great,” Bird said.

FTD, also known as frontotemporal degeneration, is a progressive, irreversible disorder that accounts for between 10 percent and 20 percent of all dementia cases. An estimated 55,000 people in the U.S. are affected by the disease, though experts say it’s vastly underdiagnosed. High-profile sufferers include former New York congressman Maurice Hinchey, 78, whose family recently announced his diagnosis.

It strikes people earlier than other types of dementia, usually in their 50s or 60s, and begins with gradual declines in behavior, judgment and language that eventually lead to profound disability. There is no treatment and no cure.

In the beginning, people with FTD lose social skills. They might tell a neighbor her dress is ugly or get in arguments with people at work. As the disease progresses, the behaviors escalate. Bird recalls one FTD patient who would crawl on the floor of a department store, collecting spare change. Others develop obsessive or repetitive behaviors or become physically or sexually aggressive.

“We’re talking about a disease that steals the essence of who you are as a human being,” said Susan Dickinson, executive director for The Association for Frontotemporal Degeneration. “It’s hard to comprehend exactly what this disease steals from people.”

Making mom smile

When Janda was growing up, no one knew what to call the condition that has so far affected 18 people in four generations of the family from Washington to Wisconsin.

“Uncle Ernie went bad, Aunt Verna went bad,” recalled Janda, who is one of eight siblings. “There was four or five who went bad.”

In Janda’s mother’s case, family members began noticing she was acting strangely starting in her mid-40s.

“Mom would make comments or go off on a tangent that wasn’t part of the conversation,” Janda recalled. “My dad could notice it, but no one talked too much about it.”

Then his father, James Janda, died suddenly at age 56 in a 1976 construction accident, devastating his adult children — and exacerbating his wife’s illness.

She became distant and withdrawn, more temperamental and easily confused.

“She couldn’t focus on an issue, but she could remember little things, old songs, things like that,” said Janda, who used to sing “Hello, Dolly!” to his mom to make her smile. “She could remember some people. It got worse as she got older. She could remember me way, way into it.”

By her late 50s, Lucille Janda could no longer cook or drive. She went to live with another son, Tony Janda, and his wife, Candace. The couple cared for her at home for the next three decades.

“It’s a lot of work, but you won’t ever forget it,” said Tony Janda, 59.

The brain shrinks

Lucille Janda’s sister was referred to Bird in the late 1980s by a Seattle neurologist. The scientist later located three far-flung cousins with the disease, all men, who were in the same chronic-care veterans hospital in Wisconsin.

“I saw them, I examined them, I was able to get blood samples,” Bird said. “I made arrangements to have brain autopsies done when they died.”

With the family’s permission, he has examined the brains of six members of the Janda family, including Lucille Janda. Before her death, Bird and a colleague visited her at home — but just once.

“She didn’t want to see us. She actually, suddenly, jumped up, opened the kitchen door and ran away,” he said. “That was the end of the visit.”

When Bird and his colleagues examined the autopsied brains, they expected to find evidence of Alzheimer’s disease, specifically the plaques and tangles that define the disorder. Plaques are clusters of proteins called beta-amyloid that build up among nerve cells. Tangles are twisted fibers of the protein tau, which is vital for nerve cell function in the brain.

“But when my colleague looked under the microscope, he saw tangles, but no plaques,” Bird said. That meant this was a novel type of dementia, similar to Alzheimer’s but different in key ways.

In 1998, Bird was part of the team that discovered the first genetic link to FTD, a mutation in a gene that governs tau.

“When it is abnormal, it is not moving things properly in the cell,” Bird explained. “Proteins back up, they don’t get to where they’re supposed to go. It makes the cell sick, then it gets very sick, then it stops functioning and then it dies.”

Hundreds, then thousands, then millions of nerve cells disintegrate, causing parts of the brain to shrink. The disease targets the brain’s frontal and temporal lobes, causing the debilitating symptoms. Exams showed Lucille Janda’s brain weighed 1.8 pounds; a typical human brain weighs 3 pounds.

Protective genes?

While Lucille Janda was alive, the family was aware of the researchers’ interest in FTD but didn’t put much stock in the science behind the disease.

Tony Janda said he worried more that his mother’s condition could have been caused by environmental factors, like using aluminum cookware. (Such a link has not been confirmed, researchers say.)

He and his wife focused on providing natural foods like stone-ground grains and pureed fresh fruits and vegetables.

“We did the juice drinks, which were energetic to her brain,” he said.

Then, in 2004, John Janda had a mild heart attack followed by bouts of debilitating anxiety, pain and sensitivity to noise. He and his wife of 45 years, Mary Janda, a retired middle-school teacher, worried it was the first sign he’d developed his mother’s disease.

“I had already prepared myself for the situation that might happen,” Janda recalled. “I thought to myself, ‘Maybe I’ll get it, too.’ ”

After much discussion, the couple reached out to Bird eight years ago and asked him to test Janda for the mutated gene.

“Because my trust is solely and wholly in God, I thought we ought to know,” said Mary Janda, 69.

The test came back positive.

“I wasn’t freaked out,” John Janda recalled. “I thought, so, OK, he’s telling me that I have the gene. If it’s in my blood, that’s fine. I don’t care. All I know is I’m not being affected by it.”

In the years since he got the news, Janda’s anxiety has subsided. He credits hard work, a healthful diet and vitamin supplements for his continued vigor. Bird and other scientists say those habits may help, but they’re not the whole reason.

“Our guess is he also inherited protective genes,” Bird said. “There’s a lot more to learn about that.”

Researchers who study FTD are focusing on potential protective factors in hopes of finding a treatment.

None of Janda’s seven siblings has developed FTD — but like many families with a history of the genetic disorder, they haven’t agreed to undergo testing, either. Most simply don’t want to know.

“I have felt zero need to be tested by doctors,” said Tony Janda. “But I have been very persistent at paying attention to the natural remedies that people talk about as being helpful to our brain.”

Ideally, Bird would like to be able to examine all members of the Janda family, including John and Mary’s five grown children and their children. But he understands why some may be reluctant.

“We wouldn’t want to put any pressure whatsoever for getting the genetic testing done,” he said. “There are perfectly good reasons not to have genetic testing.”

The Janda family members — and anyone else with a potential genetic link to the disease — could further research by donating samples and asking scientists not to reveal the results, Bird said.

With seven siblings, it’s possible that more may be like John Janda and have the mutated gene but no symptoms. It’s also possible he’s the only one.

“It is kind of an unnerving thing and kind of hard to deal with,” he said.

But he doesn’t dwell on the possibility of a developing disease he can do nothing about. Instead he focuses on work, family — and faith.

“It kind of lifts a huge burden off you,” Janda said. “You really can’t control it. As we would always say, you give it to God. It’s part of why we can have a peaceful existence.”