Overview
Attenuated Chédiak-Higashi syndrome (also called atypical or adolescent/adult-onset Chédiak-Higashi syndrome) is a milder form of Chédiak-Higashi syndrome, a rare inherited disorder that affects the immune system and other parts of the body. Unlike the classic severe form that appears in early childhood, the attenuated form tends to show up later in life — often during adolescence or adulthood — and progresses more slowly. This condition is caused by changes (mutations) in the LYST gene, which provides instructions for a protein involved in the transport of materials within cells. When this protein does not work properly, certain cell structures called lysosomes and related compartments become abnormally large and do not function correctly. This affects immune cells (making it harder to fight infections), pigment cells (causing lighter skin, hair, and eyes), and nerve cells (leading to progressive neurological problems). People with the attenuated form may have subtle lightening of skin and hair color, a tendency toward infections, easy bruising or bleeding, and progressive neurological symptoms such as difficulty with balance, tremors, and cognitive changes. Unlike the classic form, patients with attenuated Chédiak-Higashi syndrome often do not develop the life-threatening accelerated phase (hemophagocytic lymphohistiocytosis) in childhood, though it can still occur. Treatment focuses on managing infections, monitoring for the accelerated phase, and addressing neurological symptoms. Bone marrow transplantation may be considered in some cases but does not prevent the neurological decline.
Also known as:
Key symptoms:
Lighter than expected skin color (partial albinism)Lighter or silvery hairLight-colored eyesFrequent or recurrent infectionsEasy bruising or prolonged bleedingProgressive difficulty with balance and coordinationTremorsDifficulty walking (unsteady gait)Numbness or tingling in hands and feet (peripheral neuropathy)Cognitive decline or learning difficultiesSensitivity to sunlightEnlarged liver or spleen (in some cases)FatigueMuscle weakness
Clinical phenotype terms (15)— hover any for plain English
Autosomal recessive
Passed on when both parents carry the same gene change; often skips generations
Variable
Can begin at different ages, from infancy through adulthood
Treatments
No FDA-approved treatments are currently listed for Attenuated Chédiak-Higashi syndrome.
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Specialists
View all specialists →No specialists are currently listed for Attenuated Chédiak-Higashi syndrome.
Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to Attenuated Chédiak-Higashi syndrome.
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Caregiver Resources
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Mental Health Support
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Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.How can we tell if my form of Chédiak-Higashi syndrome is the attenuated type versus the classic type?,What signs should I watch for that might indicate the accelerated phase (HLH)?,Is bone marrow transplantation recommended in my case, and what are the risks and benefits?,What can be done to slow or manage the neurological symptoms?,How often should I have blood work and neurological evaluations?,Should my family members be tested to see if they are carriers?,Are there any clinical trials or new treatments being studied for this condition?
Common questions about Attenuated Chédiak-Higashi syndrome
What is Attenuated Chédiak-Higashi syndrome?
Attenuated Chédiak-Higashi syndrome (also called atypical or adolescent/adult-onset Chédiak-Higashi syndrome) is a milder form of Chédiak-Higashi syndrome, a rare inherited disorder that affects the immune system and other parts of the body. Unlike the classic severe form that appears in early childhood, the attenuated form tends to show up later in life — often during adolescence or adulthood — and progresses more slowly. This condition is caused by changes (mutations) in the LYST gene, which provides instructions for a protein involved in the transport of materials within cells. When this p
How is Attenuated Chédiak-Higashi syndrome inherited?
Attenuated Chédiak-Higashi syndrome follows a autosomal recessive inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.