Ahmad-Nielsen EB, Szecsi PB, Bratholm PS, Petersen J, Glenthøj A. Hb Kalundborg [β79(EF3)Asp→Glu;
HBB: c.240C>a], a Possible Low-affinity Hemoglobin Variant Detected during Hb A
1c Measurement.
Hemoglobin 2022;
46:124-128. [PMID:
35920343 DOI:
10.1080/03630269.2022.2079520]
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Abstract
A previously unknown hemoglobin (Hb) variant was detected during measurement of glycosylated Hb (Hb A1c) after the introduction of a new high performance liquid chromatography (HPLC) apparatus. Subsequent DNA sequencing revealed a heterozygous single nucleotide substitution at codon 79 (C>A) on the β-globin gene changing an amino acid [β79(EF3)Asp→Glu; HBB: c.240C>A]. The new Hb variant was named Hb Kalundborg after the place of origin of the proband. Heterozygosity for this mutation appears to have no clinical significance in itself except for a possibly slightly lower oxygen affinity. However, it interferes with Hb A1c measurement by HPLC, causing a falsely high Hb A1c concentration when using the G11 apparatus with clinical implications possibly to follow.
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