Shwachman-Diamond Syndrome
A rare inherited disorder of marrow, pancreas, and bone
Quick Facts
- Type: Inherited multisystem disorder
- Main systems: Bone marrow, pancreas, bones
- Common signs: Low white cells, poor digestion, short stature
- Appears: Usually in infancy or early childhood
Overview
Shwachman-Diamond syndrome (SDS) is a rare inherited disorder that affects several body systems, most notably the bone marrow, the pancreas, and the skeleton. The bone marrow often fails to make enough blood cells, especially infection-fighting white cells. The pancreas may not produce enough digestive enzymes, leading to poor absorption of food. Many children also have problems with bone growth and short stature.
SDS usually becomes apparent in infancy or early childhood. Because it affects multiple systems and carries a risk of bone marrow problems over time, it is managed by a specialist team. With careful monitoring and supportive treatment, many children grow and develop, though the condition requires lifelong attention.
Symptoms
Symptoms vary widely between individuals and across the affected systems:
- Bone marrow: Frequent infections from low white cells, and sometimes anemia or easy bruising and bleeding from low platelets
- Pancreas and digestion: Greasy, bulky, or foul-smelling stools, poor weight gain, and difficulty absorbing nutrients
- Growth and bones: Short stature and skeletal differences
- General: Slow growth and, in some children, feeding difficulties
Pancreatic problems may improve as a child gets older, while blood and bone issues need ongoing monitoring.
Causes
SDS is most often caused by changes (mutations) in a gene important for making ribosomes, the cell structures that build proteins. These changes affect cells throughout the body but particularly the bone marrow, pancreas, and growing bones.
The condition is usually inherited in an "autosomal recessive" pattern, meaning a child must inherit an altered copy of the gene from each parent. The parents are typically unaffected carriers. Genetic testing can identify the gene change in most affected people and is useful for confirming the diagnosis and for family counseling.
Risk Factors
- Both parents being carriers of an SDS gene change
- A sibling with Shwachman-Diamond syndrome
- A family history of the condition
SDS is not caused by anything the parents did, and it is not contagious. Genetic counseling helps families understand the chance of having another affected child.
Diagnosis
Diagnosis is based on the combination of blood, pancreas, and genetic findings:
- Blood counts: Often show low white cells, sometimes with low red cells or platelets, and the counts may vary over time.
- Pancreatic function tests: Measure whether the pancreas is producing enough digestive enzymes.
- Bone marrow examination: To assess marrow function and screen for changes over time.
- Genetic testing: Identifies the gene change in most cases, confirming the diagnosis.
- Bone imaging: May be used to assess skeletal differences.
Treatment
There is no single cure for the underlying gene change, so treatment supports the affected systems and monitors for complications:
- Pancreatic enzyme replacement: Enzyme supplements with meals to improve digestion and absorption, along with nutrition support and fat-soluble vitamins.
- Infection management: Prompt treatment of infections and sometimes preventive measures because of low white cells.
- Blood support: Transfusions or other treatments if blood counts are severely low.
- Bone marrow monitoring: Regular checks because SDS carries a risk of marrow failure and, in some people, blood disorders such as leukemia over the long term.
- Stem cell (bone marrow) transplant: Considered if serious marrow failure or a blood cancer develops.
- Growth and bone care: Monitoring growth and managing skeletal issues.
Living With SDS
SDS cannot be prevented because it is genetic, but ongoing care supports health and catches complications early:
- Keep regular specialist follow-up, including blood and bone marrow monitoring
- Take pancreatic enzymes and vitamins as prescribed
- Maintain good nutrition with support from a dietitian
- Treat infections promptly and keep up with vaccinations
- Consider genetic counseling for the family
When to See a Doctor
Families of a child with SDS should keep regular appointments and contact the care team if the child develops fever or signs of infection, increasing pallor or tiredness, or unusual bruising or bleeding. Seek urgent care for:
- High fever or signs of serious infection, given the risk from low white cells
- Heavy or uncontrolled bleeding
- Severe breathlessness, extreme lethargy, or collapse
If a child has ongoing digestive problems with poor growth and frequent infections, see a doctor so the cause can be investigated.
Frequently Asked Questions
What is Shwachman-Diamond syndrome?
It is a rare inherited disorder that mainly affects the bone marrow, the pancreas, and bone growth. It often causes low white blood cells, poor digestion and absorption of food, and short stature, usually appearing in infancy or early childhood.
What causes Shwachman-Diamond syndrome?
It is most often caused by changes in a gene important for building proteins in cells. It is usually inherited in a recessive pattern, meaning a child inherits an altered gene from each unaffected carrier parent. Genetic testing can confirm it.
How is Shwachman-Diamond syndrome treated?
Treatment supports the affected systems: pancreatic enzyme supplements and nutrition for digestion, prompt infection treatment for low white cells, blood support when needed, and regular bone marrow monitoring. A stem cell transplant may be considered for serious marrow failure.
Is there a cancer risk with SDS?
SDS carries a long-term risk of bone marrow failure and, in some people, blood disorders such as leukemia. This is why regular bone marrow monitoring is an important part of care, so changes can be detected and addressed early.
Can children with SDS grow up healthy?
With ongoing specialist care, many children manage their digestion, infections, and growth and develop over time, and some pancreatic problems improve with age. The condition is lifelong, so regular monitoring for blood and marrow complications continues.
References
- MedlinePlus, U.S. National Library of Medicine. Shwachman-Diamond syndrome.
- Genetic and Rare Diseases Information Center (GARD), National Institutes of Health.
- National Organization for Rare Disorders (NORD). Shwachman-Diamond syndrome.
- Genetics Home Reference, U.S. National Library of Medicine.