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Hereditary spherocytosis (HS) (also known as Minkowski-Chauffard disease 1) is a group of hemolytic anemias due to a genetic abnormality of the erythrocyte cell membrane resulting in spherocytes. The clinical spectrum is broad, from a subclinical state to severe transfusion-dependant anemia.
- diagnosed in 1 in 2000 people in northern Europe and North America 2
- 70% inherent in an autosomal dominant manner
- 15% autosomal recessive and 15% sporadic
Hereditary spherocytosis may be asymptomatic in many individuals and found incidentally on routine laboratory tests performed for other reasons. In others, the resultant anemia can be severe.
Most cases of hereditary spherocytosis are due to defects of the cell membrane of the red cells. These abnormal erythrocytes lose their normal flexibility and are more fragile when passing through the splenic microcirculation, leading to a shorter half-life in the circulation. The cells have a spherical morphology (spherocytes), rather than the normal biconcave discoid shape.
The genes most commonly affected are those that code for:
- ankyrin (ANK1)
- band 3 (SLC4A1)
- α spectrin (SPTA1)
- β spectrin (SPTB)
- protein 4.2 (EPB42)
These are all critical protein components of the plasma cell membrane 2.
Treatment and prognosis
The mainstay of management of this condition historically has been a total splenectomy. Total splenectomy has significant sequelae with regards to patient immunity and unequivocal evidence of reduced overall life expectancy is now recognized. Therefore in recent years, partial splenectomy has come into vogue.
- gallstones: from hemolytic anemia
- aplastic crises: especially after Parvovirus B19 viral infection
- extramedullary hematopoiesis
History and etymology
The Prussian endocrinologist Oskar Minkowski (1858-1931) was the first to describe this condition in 1900. He is also remembered as the individual proving that the pancreas was the organ underlying the development of diabetes mellitus 1,3.
The French internist Anatole Chauffard (1855-1932) 4 made many important contributions to the understanding of hemolytic anemias 5.
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