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A novel sickle hemoglobin: hemoglobin S-south end
Hong-Yuan Luo1, Adeboye H Adewoye, Shawn H Eung
1Hemoglobin Diagnostic Reference Laboratory, Boston Medical Center, Boston, Massachusetts, USA.
Journal of Pediatric Hematology/Oncology
|November 16, 2004
Summary
A novel sickle hemoglobin variant, Hb S-South End, presents diagnostic challenges due to its mimicry of normal hemoglobin A. This variant may worsen sickle cell disease due to enhanced polymerization.
Area of Science:
- Hematology
- Molecular Biology
- Genetics
Background:
- Sickle hemoglobin (Hb S) arises from a specific mutation in the beta-globin gene.
- Hb S variants with additional mutations can cause severe sickle cell disease, even in heterozygotes.
- Some Hb S variants can be misidentified by standard diagnostic tools, complicating diagnosis.
Observation:
- A novel Hb S variant, Hb S-South End, is characterized by two mutations: beta Glu6Val and beta Lys132Asn.
- The beta Lys132Asn mutation alone is associated with low oxygen affinity.
- Hb S-South End mimics Hb A on high-pressure liquid chromatography, hindering identification.
Findings:
- The beta Lys132Asn mutation may enhance Hb S polymerization, potentially worsening sickle cell disease.
- Hb S-South End presents diagnostic difficulties due to its chromatographic behavior.
- A review of other variant sickle hemoglobins is provided for context.
Implications:
- Accurate identification of Hb S variants is crucial for proper diagnosis and management of sickle cell disease.
- Novel variants like Hb S-South End highlight the need for advanced diagnostic techniques.
- Understanding the molecular basis of Hb S variants aids in predicting disease severity and therapeutic strategies.