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Haemoglobin Pierre-Benite--a high affinity variant associated with relative polycythaemia
M E Beard1, H C Potter, R L Spearing
1The Department of Haematology, Christchurch Hospital, Canterbury Health, Christchurch, New Zealand. mbeard@xtra.co.nz
Clinical and Laboratory Haematology
|February 15, 2002
Summary
The second case of Hb Pierre--Benite (beta90 Glu-->Asp) shows increased oxygen affinity. This high-affinity hemoglobin variant caused relative, not true, polycythemia, potentially delaying diagnosis.
Area of Science:
- Hematology
- Molecular Biology
- Biochemistry
Background:
- Hemoglobin variants can alter oxygen transport and red blood cell mass.
- Hb Pierre--Benite (beta90 Glu-->Asp) is a rare high-affinity hemoglobin variant.
Observation:
- Electrophoresis at pH 8.3 did not detect instability or charge shift.
- Electrospray ionization mass spectrometry (ESI MS) identified an abnormal beta chain with a 14 Da mass reduction.
Findings:
- Hb Pierre--Benite (beta90 Glu-->Asp) presents with increased oxygen affinity.
- Blood volume studies revealed a relative polycythemia, not a true polycythemia.
Implications:
- High oxygen affinity hemoglobin variants may cause relative polycythemia, challenging conventional diagnostic assumptions.
- Accurate diagnosis of hemoglobinopathies requires advanced techniques like ESI MS.
- Understanding variant-specific pathophysiology is crucial for timely and correct clinical management.