SCIENTIFIC BACKGROUND

SBDS

Shwachman-Bodian-Diamond syndrome (SBDS) is a rare autosomal recessive inherited disorder characterized by exocrine pancreatic insufficiency, bone marrow dysfunction with increased risk of developing leukemia, skeletal malformations and short stature. After cystic fibrosis, SBDS is the second most common cause of exocrine pancreatic insufficiency in childhood. Hematologic disorders include neutropenia with defective chemotaxis, moderate thrombocytopenia and anemia, and increased fetal hemoglobin concentration. These disorders increase in severity, leading to aplasia in 25% of cases. As long as neutropenia is moderate and asymptomatic, management is limited to nutrition (pancreatic enzymes, nutrients, vitamins). Sometimes therapy with the hematopoietic growth factor G-CSF (granulocyte colony-stimulating factor) is beneficial. Patients have an increased risk of developing secondary leukemia (usually AML).

 

Approximately 90% of SBDS patients have loss-of-function mutations in the SBDS gene on chromosome 7. Approximately 75% of causative variants are caused by gene conversion with the pseudogene SBDSP1. SBDSP1 is a non-functional copy of the SBDS gene with 97% identical sequence. In about 95% of cases, exon 2 and intron 2 are affected.

 

References

Nelson et Myers. 2018, GeneReviews® [Internet] / Bezzerri & Cipolli 2019, Mol Diagn Ther 23:281 / Woloszynek et al. 2004, Blood 104:3588.

GENES

SBDS
How to order

LATEST ARTICLES

A recent study highlights promising outcomes for BRCA variant carriers with breast cancer undergoing breast-conserving therapy. Analyzing 172 women, ...

Read more

Epidermolysis bullosa (EB), sometimes called butterfly skin, is a group of rare skin diseases with a common symptom: fragile skin that tears and blis...

Read more

In the rapidly evolving field of human genetics diagnostics, laboratories face the challenge of keeping up with the latest advancements in technology...

Read more

Medicine as we know it has been around for just over 100 years. Before this, alcohol and opium were the main forms of pain relief in Europe. The deve...

Read more

Below you can read the two winning essays from the second annual DNA essay competition. The subject of the essay was “Family history is one of the ...

Read more

Mosaicism is the presence of two or more genetically different sets of cells within the same person. It is a biological phenomenon that may have no e...

Read more

Cystic fibrosis (CF) is a life-threatening, progressive, inherited condition that causes severe damage to the body, mainly to organs of the respirato...

Read more

Cancer can sometimes run in families; in fact, it is estimated that 5-10% of all cancer cases are inherited. This includes up to 10% of breast cancer...

Read more

Mosaicism is a biological phenomenon in which a person has two or more genetically different sets of cells. Although mosaicism may have no effect, it...

Read more

Background information on in vitro diagnostic services Laboratory-based testing methods and medical devices play a critical role in diagnosis and ...

Read more