2012, Number 1
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Rev Biomed 2012; 23 (1)
Hemoglobin Raleigh in Costa Rica detected as false high glycosylated hemoglobin levels
Rodríguez-Romero WE, Villalobos-Fernández J, Salas-Abarca P, Hong-yuan L, Chui DHK
Language: Spanish
References: 113
Page: 33-38
PDF size: 172.76 Kb.
ABSTRACT
Introduction. Abnormal hemoglobins (Hb) are a part of hereditary hemoglobin defects.
They cause significant Public Health problems in many countries. While some abnormal hemoglobins present clinical problems, the majority are innocuous. Often they are diagnosed by chance using highly specialized methods.
Hb Raleigh, a beta chain variant, has been reported to interfere with the detection of glycosylated hemoglobin HbA1c, giving falsely elevated values. This report describes the first findings of Hb Raleigh in Costa Rica, initially detected by abnormally high glycated Hb levels.
Clinical case. Adult Caucasian male without hematological manifestations: The subject was a known diabetic, with repeatedly elevated glycated Hb determinations, initially estimated by ionic interchange chromatography (Stambio). Definitive HbA1c levels were subsequently determined using HPLC based technology (Biorad D-10 HPLC) resulting in 30% elevated results for glycated hemoglobin. Biochemical and genetic analyses were also performed to determine the presence of Hb Raleigh. This variant can be detected biochemically only by high performance liquid chromatography (HPLC) and cannot be identifi ed by hemoglobin electrophoresis.
Discussion. Hb Raleigh is an infrequent ß chain variant, with a single mutation in codon 1 position, and a Vall.Ac-Ala change. This case was initially reported as an unusually high HbA1c level, and ultimately identified as Hb Raleigh. This finding is important because the positive interference with glycated hemoglobin determinations should draw attention to the need for clinical laboratories to have an alternative to HPLC methodology, when confirming extremely elevated glycated Hb values.
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G., Capellini, MD. Unreliable estimation of HbAic
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Stuart MJ, Nagel RL. Sickle cell disease. Lancet 2004; 364: 1343-360.
Sáenz GF, Granado A, Valverde K. Hemoglobinopatía Clínica. En: Sáenz GF, Rodríguez WE, Jiménez R, Salazar L, Valverde B, editores. Hematología Analítica. 5ª ed. San José: EDNASSS; 2008. p 205-19.
Sáenz GF, Rodríguez WE, Chaves MA, Variantes estructurales de la Hemoglobina en Iberoamérica. Rev Biol Trop 1993; 41: 393-8
Patrinos, G.P., B. Giardine, C. Riemer, W. Miller, D.H.K. Chui, N.P. Anagnou et al. Improvements in the HbVar database of human hemoglobin variants and thalassemia mutations for population and sequence variation studies. Nucl Acids Res. 32; 537-41. URL: http://globin.cse.psu.edu/hbvar/menu.html
Thomas LB, Agosti SJ, Man MA, Mastorides SM. Screening for hemoglobinopathies during routine hemoglobin A1c testing using the Tosoh G7 Glycohemoglobin Analyzer. Ann Clin Lab Sci 2007; 3:251-5.
Kutlar A, Huisman THJ. The detection of Hemoglobinopathies; techniques and diagnostic. Human Biochemical Genetics: A Laboratory Manual. New York: J. Wiley and Sons; 1991.
Sáenz GF, Rodríguez WE. Estudios de la hemoglobina por electroforesis y HPLC. En: Sáenz GF, Rodríguez WE, Jiménez R, Salazar L, Valverde B, editores. Hematología Analítica. 5ª ed. San José: EDNASSS; 2008. p 649-61.
Moo-Penn WF, Bechtel KC, Schmidt RM, Johnson MH, Jue DL, Schmidt DE Jr et al. Hemoglobin Raleigh (beta1 valine replaced by acetylalanine). Structural and functional characterization. Biochemistry 1977; 22: 4872-9.
Landin B, Jeppsson JO. Rare beta chain hemoglobin variants found in Swedish patients during HBA1c analysis. Hemoglobin 1993; 4: 303-18.
Behan KJ, Storey NM, Lee HK. Reporting variant hemoglobins discovered during hemoglobin A1c analysis. Clin Chim Acta 2009; 406: 124-30.
Aldasouqi S, Solomon D, Bokhari S, Khan P, Muneera S, Gossain V. Glycohemoglobin A1c; a promising screening tool in gestational diabetes mellitus. Int J Diabetes Dev Ctries 2008; 28: 121-4.
Hertel JK, Johansson S, Raeder H, Platou CG, Midthjell K, , Molven A, et al. Evaluation of four novel genetic variants affecting hemoglobin A1c levels in a population based type 2 diabetes cohort. BMC Med Genet 2011; 12: 20-5.
Rai DK, Landin B, Griffiths WJ, Alvelius G. Identification of N-terminal acetylation in Hb Raleigh (beta1Val-->Ac-Ala) by electrospray tandem mass spectrometry. Rapid Commun Mass Spectrom 2002; 18: 1793-6.
Castelly, R, Tempesta, A, Bianchi, A., Porro, T, Ivaldi, G., Capellini, MD. Unreliable estimation of HbAic due to the presence of Camperdown haemoglobin (beta 104 (G6) Arg-Ser). Diabet Med 2004; 21: 377-9.
King, ME, Rifai, N, Malekpour, A. Hemoglobin Hope interferes with measurement of glycated hemoglobin by ion exchange chromatographty and electrophoresis. Clin Chem 1984; 30: 1106-7.
Chen D, Crimmins DL, Hsu FF, Lindberg FP, Scott MG.. Hemoglobin Raleigh as the cause of a falsely increased hemoglobin A1C in an automated ion-exchange HPLC method. Clin Chem 1998; 6: 1296-301.
Flückinger R, Winterhalter, KH. In vitro synthesis of hemoglobin A1c. FEBS Let 1976; 72: 356-60
Bunn HF, Gabbay KM, Gallop PM. The glycosilation of hemoglobin: relevance to diabetes mellitus. Science 1978; 200: 21-5
Rahbar, S. Glycosilated hemoglobins. En: Schneider, RG. University of Texas Medical Branch, Galveston. Editorial Texas Reports on Biology Medicine; 1981. Vol 40: 373-96.
Sáenz GF. Las Hemoglobinas Glicosiladas. En: Sáenz GF, Chaves, MA, Rodríguez WE, Barrantes, A, Orlich, J. editores. Hematología Analítica. 3a. ed. San José: EDNASSS; 1995. P.389-97.
John WG, Mosca A, Weykamp C, Goodall I. HbA1c stadarization: history, science and politics. Clin Biochem Rev 2007; 28: 163-8.
Dreschsler C, Krane V, Ritz E, März W, Wanner C. Glycemic control and cardiovascular events in diabetic hemodialysis patient. Circulation 2009; 120: 2421-8.