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Hb Aalesund (HBA2: c.400_406delAGCACCG), an Unstable α-Globin Variant Found in a Norwegian Patient Causing Moderate Hemolytic Anemia and Falsely High Hb A1c Using Ion Exchange High Performance Liquid Chromatography

Grimholt, Runa Marie; Fjeld, Bente; Selsås, Hilde; Schwettmann, Lutz; Klingenberg, Olav
Journal article, Peer reviewed
Accepted version
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Grimholt (535.6Kb)
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http://hdl.handle.net/11250/2621185
Utgivelsesdato
2019
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  • Institutt for helsevitenskap Ålesund [353]
  • Publikasjoner fra CRIStin - NTNU [20842]
Originalversjon
Hemoglobin. 2019, 43 (2), 122-125.   10.1080/03630269.2019.1614048
Sammendrag
A new unstable hemoglobin (Hb) variant, named Hb Aalesund, was detected during Hb A1c measurement in a patient with a nearly compensated hemolytic anemia. Sequencing of the α-globin genes revealed a 7 bp deletion in exon 3 of the HBA2 gene (HBA2: c.400_406delAGCACCG) (NM_000517.4) causing a frameshift and a premature termination codon (PTC) two positions downstream. Apparently, the transcript bypassed nonsense-mediated decay (NMD), and a truncated protein was translated. The unstable Hb variant presumably underwent rapid denaturation, as heterozygosity of Hb Aalesund was associated with mild hemolytic anemia. In addition, the Hb variant interfered with Hb A1c measurement by cation exchange high performance liquid chromatography (HPLC), causing a falsely high Hb A1c result when using the Bio-Rad D10™ Hemoglobin Analyzer fast Hb A1c Program.
Utgiver
Taylor & Francis
Tidsskrift
Hemoglobin

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