Nash’s Story: Turning a Rare Diagnosis into a Movement of Hope
At first glance, Nash’s story begins like so many others—a happy, healthy baby boy, welcomed into a loving family. But as the months passed, subtle differences began to emerge, setting his parents, Leslie and Chase Muehlheuser, on a journey they never could have anticipated.
What started as a quiet concern would grow into something far bigger than one child. Today, their journey is fueling a mission to bring awareness, funding, and hope to families around the world facing a rare condition known as DEAF1-Associated Neurodevelopmental Disorder (DAND).
When a Mother’s Instinct Kicks In
For Leslie Muehlheuser, the first signs came early.
At around nine months old, she noticed Nash wasn’t meeting milestones the way her older son had. He couldn’t hold his own bottle or feed himself—small things, but enough to spark concern.
“Don’t compare him,” people would say.
But Leslie couldn’t ignore her instincts.
With Chase by her side, they chose to act early, enrolling Nash in therapies and seeking answers. By 12 months, Nash was diagnosed with mild hypotonia. By age two, therapists confirmed what Leslie already felt—something wasn’t quite right, even if it didn’t fit a typical diagnosis.
Determined to keep pushing forward, Leslie and Chase pursued further testing through the Els for Autism Foundation’s CADI program, a step that would ultimately change everything.
Importantly, their decision to continue seeking answers aligns with guidance from the American Academy of Pediatrics (AAP), which recommends that any child with developmental delays, intellectual disability, or an autism diagnosis receive genetic testing. Yet, despite this recommendation, less than half of children actually undergo this critical testing—meaning many families may miss the opportunity for earlier diagnosis, support, and access to emerging research.
For the Muehlheuser family, that persistence made all the difference.
The Day Everything Changed
The diagnosis came through genetic testing at Joe DiMaggio Children’s Hospital.
Leslie still remembers the moment clearly.
Nash was diagnosed with DEAF1-Associated Neurodevelopmental Disorder (DAND)—an extremely rare genetic condition. At the time, he was one of only a few dozen known cases worldwide.
The news was overwhelming.
There was no roadmap. No clear guidance. And even the doctors had little information to offer.
In that moment, Leslie and Chase were left not only with a diagnosis—but with uncertainty about their son’s future.
That same day, Leslie followed one crucial piece of advice: find other families like yours.
She connected with a small online community of parents navigating DAND. For the first time, they weren’t alone.
Grief, Love, and a New Reality
With the diagnosis came a wave of emotions.
For Leslie, it meant grieving—not Nash himself, but the version of life she had imagined for him.
The milestones that might never come.
The independence he may never have.
The unknowns that would shape their future.
But alongside that grief came fierce love and determination.
Together, Leslie and Chase adapted to a new reality—one that requires constant care, advocacy, and strength.
Nash faces significant daily challenges, including being non-speaking, intellectual disability, risk of seizures, anxiety, sleep difficulties, and more. He requires 24/7 supervision, and his safety is always top of mind.
For their family, DAND isn’t just a diagnosis—it’s a lifelong commitment.
Turning Pain Into Purpose
For Leslie, standing still was never an option.
With a 20+ year career in finance, the world of science and genetics was unfamiliar—but action is part of who she is.
Within months of Nash’s diagnosis, Leslie connected with another mother who had received the same rare diagnosis for her child—on the very same day.
From there, the circle grew.
Together with four other mothers across the country, Leslie helped build a support system that quickly turned into something much bigger.
In June 2025, they officially launched The DAND Alliance, a 501(c)(3) nonprofit.
A Mission Bigger Than One Family
Today, Leslie and Chase are not just parents navigating a rare diagnosis—they are advocates helping lead a movement.
The mission of The DAND Alliance is clear:
- Accelerate research
- Bring together families and scientists
- Drive real progress toward treatments—and ultimately, a cure
Their immediate goal is to raise $300,000 to fund critical research tools, including cell lines, biobanks, and preclinical data—essential building blocks for developing gene therapies.
“The science is ready. The researchers are ready,” Leslie says. “We just need the funding to move it forward.”
Donating to support critical research.
Finding Hope in the Small Moments
Despite the challenges, the Muehlheuser family finds strength in the everyday moments.
They celebrate what Leslie calls “inchstones”—small victories that mean everything.
A breakthrough in therapy.
A moment of connection.
A sign of progress, no matter how small.
And through it all, they lean on a community that understands both the heartbreak and the hope that comes with raising a child with a rare condition.
A Message From Leslie and Chase
For other parents navigating a rare diagnosis, Leslie’s advice is simple—but powerful:
- Trust your instincts
- Build your community
- Never stop advocating for your child
Parents, she says, often become “Dr. Mom” and “Dr. Dad”—leading their child’s care in ways they never imagined.
And while the path can feel isolating, it’s one no family should walk alone.
How You Can Help
Leslie and Chase know that real progress takes a community.
You can support their mission by:
- Donating to fund critical research
- Hosting or attending fundraising events
- Raising awareness about rare diseases
- Connecting The DAND Alliance with others who can help
Every effort—big or small—brings them closer to a future with answers.
Looking Ahead
Nash’s story is still being written.
But thanks to the determination of Leslie and Chase Muehlheuser, it’s already changing lives far beyond their own.
What began as one family’s search for answers has become a growing movement—one driven by love, resilience, and an unshakable belief that better days are ahead.
To learn more or support the mission, connect with The DAND Alliance and help turn hope into action.
