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Prepublished online as a Blood First Edition Paper on May 15, 2003; DOI 10.1182/blood-2002-06-1705.

Submitted July 1, 2002
Accepted April 26, 2003
The 'stomatin' gene and protein in overhydrated hereditary stomatocytosis
Britta Fricke, A C Argent, Margaret C Chetty, Arnold R Pizzey, E J Turner, Mei M Ho, Achille M Iolascon, Monika von Duering, and Gordon W Stewart*
Department of Medicine, University College London, London, United Kingdom
Abteilung fur Neuroanatomie, Institut fur Anatomie MA 6/152, Ruhr-Universitat, Bochum, Germany
Department of Bacteriology, National Institute for Biological Standards and Control, Hertfordshire, United Kingdom
Department of Biochemistry and Molecular Biology, Universita Federico II, Naples, Italy
Department of Hematology, University College London, London, United Kingdom
* Corresponding author; email: g.stewart{at}ucl.ac.uk.
In 'overhydrated hereditary stomatocytosis,' Coomassie and silver-stained polyacrylamide gels show an apparently complete deficit of the 32kD membrane protein, 'stomatin.' We have used an anti-stomatin antibody to examine peripheral blood films, bone marrow, splenic tissue and hepatic tissue from these patients by immunocytochemistry. This technique revealed that, in fact, some red cells did show positive stomatin immunoreactivity; and consistent with this result, western blot analysis of the red cell membranes confirmed that about 1/20-1/50 of the normal amount of stomatin was in fact present. Flow cytometry, combining immunoreactive quantitation of stomatin expression with thiazole orange staining for reticulocytes, showed that in OHSt, the young cells had more stomatin. Magnetic-activated cell separation studies, using beads to which an anti-transferrin receptor antibody was conjugated, confirmed that in OHSt there was a correspondence between expression of stomatin and the transferrin receptor. Immunocytochemistry and western blotting revealed that in OHSt patients, the protein was present in spleen, liver, neutrophils, platelets, monocytes and about 50% of the peripheral lymphocytes, with the same distribution as in normal controls. Neither southern blots, nor direct sequencing of multiple subclones of the cDNA, nor sequencing of amplicons from genomic DNA revealed any significant abnormality. The deficiency of stomatin from red cells appears to be due to a loss of stomatin from these red cells on maturation in the bone marrow and in the circulation.

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