Overview
Low oxygen affinity gamma chain hemoglobin disease is a rare blood condition caused by changes (mutations) in the gamma-globin genes, which produce a type of hemoglobin found mainly in newborns called fetal hemoglobin (hemoglobin F). In this condition, the fetal hemoglobin releases oxygen to the body's tissues more easily than normal — meaning it has a lower than usual attraction (affinity) for oxygen. Fetal hemoglobin is the main oxygen-carrying protein during pregnancy and in the first months of life, and it is gradually replaced by adult hemoglobin during infancy. Because the abnormal gamma chain hemoglobin lets go of oxygen too readily, the body may appear to have lower oxygen levels on certain measurements, even though tissues are actually receiving adequate oxygen. Newborns with this condition may appear bluish (cyanotic), which can be alarming. However, because fetal hemoglobin is naturally replaced by adult hemoglobin within the first several months of life, symptoms typically resolve on their own as the baby grows. This condition is generally considered benign and self-limiting. Most affected infants do not require specific treatment. The main challenge is distinguishing this condition from more serious causes of cyanosis in newborns, such as heart defects or lung problems. Accurate diagnosis through hemoglobin analysis and genetic testing can prevent unnecessary invasive procedures and provide reassurance to families.
Key symptoms:
Bluish skin color (cyanosis) in newbornsLow oxygen saturation readings on pulse oximetryGrayish or dusky skin toneApparent low blood oxygen levels that do not match the baby's overall healthSymptoms that gradually improve over the first few months of life
Autosomal dominant
Passed on from just one parent; each child has about a 50% chance of inheriting it
Neonatal
Begins at or shortly after birth (first 4 weeks)
Treatments
No FDA-approved treatments are currently listed for Low oxygen affinity gamma chain hemoglobin disease.
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Specialists
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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
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Caregiver Resources
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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 you be sure my baby's cyanosis is from this hemoglobin condition and not from a heart or lung problem?,How long will it take for my baby's skin color to return to normal?,What follow-up tests will be needed to track my baby's hemoglobin levels?,Is there any risk of long-term health problems from this condition?,Could my future children also have this condition?,Should other family members be tested for this hemoglobin variant?,Are there any warning signs I should watch for at home that would require emergency care?
Common questions about Low oxygen affinity gamma chain hemoglobin disease
What is Low oxygen affinity gamma chain hemoglobin disease?
Low oxygen affinity gamma chain hemoglobin disease is a rare blood condition caused by changes (mutations) in the gamma-globin genes, which produce a type of hemoglobin found mainly in newborns called fetal hemoglobin (hemoglobin F). In this condition, the fetal hemoglobin releases oxygen to the body's tissues more easily than normal — meaning it has a lower than usual attraction (affinity) for oxygen. Fetal hemoglobin is the main oxygen-carrying protein during pregnancy and in the first months of life, and it is gradually replaced by adult hemoglobin during infancy. Because the abnormal gamm
How is Low oxygen affinity gamma chain hemoglobin disease inherited?
Low oxygen affinity gamma chain hemoglobin disease follows a autosomal dominant inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Low oxygen affinity gamma chain hemoglobin disease typically begin?
Typical onset of Low oxygen affinity gamma chain hemoglobin disease is neonatal. Age of onset can vary across affected individuals.