Overhydrated hereditary stomatocytosis (OHST), which is clinically characterized by a hemolytic anemia, is a rare, dominantly inherited disorder of red blood cells (RBCs) associated with increased membrane permeability to monovalent cations and increased activity of the Na+K+-ATPase. The influx of Na+ exceeds the loss of K+ causing water influx and resulting in swollen erythrocytes, hemolysis, and stomatocyte formation. The OHST phenotype is also associated with a dramatic decrease or the absence of the 32-kDa membrane raft protein stomatin. OHST diagnosis is based on a hemolytic anemia associated with a massive right shift of the osmotic gradient ektacytometry curve and a decreased osmotic resistance, together with a major increase in a monovalent cation leak. Recently, OHST was found to be linked to amino acid substitutions in Rh-associated glycoprotein (RhAG).
Category
Hematologic disease
Brite
Human diseases in ICD-11 classification [BR:br08403]
03 Diseases of the blood or blood-forming organs
Anaemias or other erythrocyte disorders
Haemolytic anaemias
Congenital haemolytic anaemia
3A10 Hereditary haemolytic anaemia
H01979 Overhydrated hereditary stomatocytosis
Shmukler BE, Mukodzi S, Andres O, Eber S, Alper SL
Title
Autosomal dominant overhydrated stomatocytosis associated with the heterozygous RhAG mutation F65S: a case of missed heterozygosity due to allelic dropout.
