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Leal I, Dos Santos TD, Gilli S, Castilho L. Effects of prophylactic red blood cell (RBC) transfusion with extended antigen matching on alloimmunization in patients with Sickle Cell Disease (SCD). Transfus Apher Sci 2023; 62:103813. [PMID: 37743224 DOI: 10.1016/j.transci.2023.103813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 05/31/2023] [Accepted: 09/10/2023] [Indexed: 09/26/2023]
Abstract
BACKGROUND RBC alloimmunization remains a significant problem for many patients with SCD. To reduce alloimmunization some strategies have been implemented to provide limited or extended antigen matched RBC transfusions to patients with SCD who need chronic transfusion support. The aim of this study was to evaluate the effects of prophylactic RBC transfusion with extended antigen matching on alloimmunization in patients with SCD. METHODS This is a 20-year retrospective study of patients with SCD transfused with RBCS that were prospectively matched for D, C, c, E, e, K, Fya/Fyb, Jka/Jkb and S antigens. Our study included 95 patients, and none had antibodies documented before their first transfusion. Patients and donors were phenotyped and molecular typing was performed in all patients who had recent transfusions or a positive direct antiglobulin test to predict their antigen profile. Unexpected antibodies to the Rh system, meaning anti-Rh antibodies in patients whose serologic phenotype was Rh positive, were investigated by molecular genotyping for RH variant alleles. RESULTS During this study-period, 12 (12.6%) were alloimmunized and 83 (87.4%) were not. Among the 12 patients who alloimmunized, 7 (58.3%) developed antibodies to Rh antigens and 5 (41.7%) produced antibodies to low prevalence antigens. All patients who developed Rh antibodies had RH variant alleles. Autoantibodies were found in 16 (16.8%) transfused patients. CONCLUSION SCD patients benefit from receiving prophylactic RBC transfusions with extended antigen matching, as demonstrated by the reduction on the rates of alloimmunization and the lack of antibodies to K, FY, JK and S antigens, however, this strategy does not avoid alloimmunization to Rh and low-prevalence antigens.
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Affiliation(s)
- Ianca Leal
- Hemocentro Unicamp, Campinas, SP, Brazil
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Kaliniczenko A, Martins JO, Cruz BR, Chiba AK, Filho JPBV, Bordin JO. Frequency of the DI*A, DI*B and Band 3 Memphis polymorphism among distinct groups in Brazil. Hematol Transfus Cell Ther 2023; 45 Suppl 2:S91-S94. [PMID: 35662509 PMCID: PMC10433289 DOI: 10.1016/j.htct.2022.03.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 02/24/2022] [Accepted: 03/03/2022] [Indexed: 10/18/2022] Open
Abstract
INTRODUCTION The Band 3 is a red blood cell protein that carries the Dia and Dib antigens from the Diego blood system. The SLC4A1 gene encodes Band 3; Band 3 Memphis is a polymorphism of normal Band 3 and has two variants, but only the variant II carries the Dia antigen. OBJECTIVES Describe the frequencies of the DI*A and DI*B alleles and the Band 3 Memphis among blood donors, sickle cell disease (SCD) patients and Amazonian Indians. METHODS A total of 427 blood samples were collected and separated into three groups: 206 unrelated blood donors, 90 patients with SCD and 131 Amazonian Indians. We performed DI*A/B, normal Band 3 and Band 3 Memphis genotyping, using the Polymerase Chain Reaction Restriction Fragment Length Polymorphism (PCR-RFLP). RESULTS The frequency of the DI*A/DI*A genotype was 0.5% in blood donors and it was not found in other groups. The frequency of the DI*A/DI*B was higher in Amazonian Indians (33.6%) and the frequency of the DI*B/DI*B was highest in blood donors (92.2%). All 105 individuals tested were positive for the presence of normal Band 3 and of these individuals, only 5/105 (4.8%) presented the Band 3 Memphis mutation. CONCLUSION We observed a higher frequency of the DI*B allele in blood donors and a low frequency of the DI*A/DI*A genotype in all groups studied. The Band 3 Memphis was found in a higher frequency in the blood donor group. Our findings highlight the importance of analyzing different population groups to gain a better understanding of the genetic association of blood group antigens.
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Affiliation(s)
| | | | - Bruno Ribeiro Cruz
- Universidade Federal de São Paulo, Escola Paulista de Medicina, SP, Brazil
| | - Akemi Kuroda Chiba
- Universidade Federal de São Paulo, Escola Paulista de Medicina, SP, Brazil
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Muniz AA, da Silva AR, Ferraz IA, Martins ML, Godin MM, Schmidt LC, Dusse LMSA, da Silva Malta MCF. The screening of rare blood donors in a highly admixed population: A new approach for Holley and Diego genotyping and impact of genomic and self-reported ancestry. Transfus Med 2019; 30:148-156. [PMID: 31820508 DOI: 10.1111/tme.12653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 10/21/2019] [Accepted: 11/09/2019] [Indexed: 11/29/2022]
Abstract
OBJECTIVES The present study aimed to develop strategies for genotyping DO*HY (Dombrock system) and DI*A/DI*B (Diego system) alleles and to evaluate the impact of genomic and self-declared ancestry on rare donor screening in admixed populations. BACKGROUND The antigens Hy and Dib demonstrate clinical importance. The lack of antisera for the serological evaluation of these antigens makes it necessary to develop molecular methods. In addition, considering that some rare red blood cell phenotypes present differences in frequency between ethnic groups, it is important to assess the applicability of self-declared ancestry in the search for rare donors in admixed populations. METHODS DO*HY and DI*A/DI*B genotyping based on real-time polymerase chain reaction (PCR) was standardised. A total of 457 blood donors clustered by self-defined skin colour/race categories were genotyped. Furthermore, individual genomic ancestry was used in the analyses. RESULTS The assays developed are reproducible and provide satisfactory results even at low concentrations of DNA, which make them useful in situations where the DNA is scarce, such as dried blood spots on filter paper, or when screening for pooled samples. No significant difference was observed in the frequencies of the DI*A, DI*B and DO*HY, comparing the self-declared White (branco) donors with those who are Black (preto) and Brown (pardo). CONCLUSION Real-time PCR, especially using pooled samples, is a promising strategy to screen rare blood donors. Although both self-reported race/colour and some blood group phenotypes are associated with ancestry, the results point to a greater complexity in the application of self-declared race/colour in the screening of rare donors in admixed populations.
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Affiliation(s)
- Amanda A Muniz
- Fundação Hemominas, Belo Horizonte, Brazil.,Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Adão R da Silva
- Fundação Hemominas, Belo Horizonte, Brazil.,Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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Costa DC, Schinaider AA, Santos TM, Schörner EJ, Simon D, Maluf SW, de Moraes ACR, Silva MCS. Frequencies of polymorphisms of the Rh, Kell, Kidd, Duffy and Diego systems of Santa Catarina, Southern Brazil. Rev Bras Hematol Hemoter 2016; 38:199-205. [PMID: 27521857 PMCID: PMC4997891 DOI: 10.1016/j.bjhh.2016.04.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2015] [Revised: 03/31/2016] [Accepted: 04/11/2016] [Indexed: 11/25/2022] Open
Abstract
Background Red blood cell genes are highly polymorphic with the distribution of alleles varying between different populations and ethnic groups. The objective of this study was to investigate gene polymorphisms of blood groups in the state of Santa Catarina, Southern Brazil. Methods Three hundred and seventy-three unrelated blood donors and 31 transfusion-dependent patients were evaluated to investigate polymorphisms of the Rh, Kell, Duffy, Kidd, and Diego blood group systems in a population from the state of Santa Catarina. The subjects, from seven regions that comprise the blood-banking network of the state, were assessed between August 2011 and March 2014. The genotypes of the Rh, Kell, Duffy, Kidd, and Diego systems were determined using the restriction fragment length polymorphism-polymerase chain reaction and allele-specific polymerase chain reaction techniques. Results The genotype frequencies in this study were significantly different when populations from different regions of Santa Catarina were compared. Furthermore, there were also significant differences in the genetic frequencies compared to other Brazilian states. The genotype frequencies of the Kell and Kidd blood groups are similar to European populations from Naples, Italy and Zurich, Switzerland. Conclusion This article reports for the first time the frequency of polymorphisms of blood group systems in blood donors from Santa Catarina, Southern Brazil.
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Affiliation(s)
| | | | | | | | - Daniel Simon
- Universidade Luterana do Brasil, Canoas, RS, Brazil
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Baleotti W, Ruiz MO, Fabron A, Castilho L, Giuliatti S, Donadi EA. HLA-DRB1*07:01 allele is primarily associated with the Diego a alloimmunization in a Brazilian population. Transfusion 2014; 54:2468-76. [PMID: 24724911 DOI: 10.1111/trf.12652] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 02/12/2014] [Accepted: 02/14/2014] [Indexed: 11/30/2022]
Abstract
BACKGROUND The Diego blood group presents a major polymorphic site at Residue 854, causing a proline (Di(b) antigen) to leucine (Di(a) antigen) substitution. Di(a) alloimmunization has been observed among Asian and Native South American populations. Considering that Brazilians represent a genetically diverse population, and considering that we have observed a high incidence of Di(a) alloimmunization, we typed HLA-DRB1 alleles in these patients and performed in silico studies to investigate the possible associated mechanisms. STUDY DESIGN AND METHODS We studied 212 alloimmunized patients, of whom 24 presented immunoglobulin G anti-Di(a) , 15 received Di(a+) red blood cells and were not immunized, and 1008 were healthy donors. HLA typing was performed using commercial kits. In silico analyses were performed using the TEPITOPEpan software to identify Diego-derived anchor peptide binding to HLA-DRB1 molecules. Residue alignment was performed using the IMGT/HLA for amino acid identity and homology analyses. RESULTS HLA-DRB1*07:01 allele was overrepresented in Di(a) -alloimmunized patients compared to nonimmunized patients and to healthy donors. Two motifs were predicted to be potential epitopes for Di(a) alloimmunization, the WVVKSTLAS motif was predicted to bind several HLA-DR molecules, and the FVLILTVPL motif exhibited highest affinity for the HLA-DRB1*07:01 molecule. Pocket 4 of the DRB1*07:01 molecule contained specific residues not found in other HLA-DRB1 molecules, particularly those at Positions 13(Y), 74(Q), and 78(V). CONCLUSION Individuals carrying the HLA-DRB1*07:01 allele present an increased risk for Di(a) alloimmunization. The identification of susceptible individuals and the knowledge of potential sensitization peptides are relevant approaches for transfusion care, diagnostic purposes, and desensitization therapies.
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Affiliation(s)
- Wilson Baleotti
- Faculty of Medicine of Marília (FAMEMA), Marília, São Paulo, Brazil
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Flôres MALR, Visentainer JEL, Guelsin GAS, Fracasso ADS, de Melo FC, Hashimoto MN, Sell AM. Rh, Kell, Duffy, Kidd and Diego blood group system polymorphism in Brazilian Japanese descendants. Transfus Apher Sci 2013; 50:123-8. [PMID: 24231689 DOI: 10.1016/j.transci.2013.09.014] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Revised: 08/26/2013] [Accepted: 09/30/2013] [Indexed: 11/25/2022]
Abstract
Polymorphisms of Rh, Kell, Duffy, Kidd and Diego blood group systems were studied in 209 unrelated Brazilian Japanese descendants from South of Brazil. The methods used were multiplex-PCR, AS-PCR and RFLP-PCR. The differences in frequencies among the populations were evaluated using chi-square test. The frequencies for Rh, Kell, Kidd and Diego system were similar to those of the Japanese. RHCE(*)CC, RHCE(*)EE genotypes and FY(*)01 allele were lower and FY(*)01N.01 was higher than Japanese. These differences in the frequencies between Brazilian Japanese descendants and Japanese could indicate a gene flow in Brazilian population and reinforce the importance of this knowledge to achieve safe red blood cells.
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Affiliation(s)
- Marli Aparecida Luvisuto Rossett Flôres
- Program of Biosciences Applied to Pharmacy, Department of Clinical Analysis and Biomedicine, Maringa State University Parana, Brazil, Av. Colombo, 5790 Maringa, PR 87020900, Brazil
| | | | | | - Adriana de Souza Fracasso
- Basic Health Sciences Department, Maringa State University Parana, Brazil, Av. Colombo, 5790 Maringa, PR 87020900, Brazil
| | - Fabiano Cavalcante de Melo
- Basic Health Sciences Department, Maringa State University Parana, Brazil, Av. Colombo, 5790 Maringa, PR 87020900, Brazil
| | - Margareth Naomi Hashimoto
- Maringa Regional Hemocenter, Maringa State University, Av. Mandacaru, 1600 Maringa, PR 87080000, Brazil
| | - Ana Maria Sell
- Basic Health Sciences Department, Maringa State University Parana, Brazil, Av. Colombo, 5790 Maringa, PR 87020900, Brazil.
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A new strategy to identify rare blood donors: single polymerase chain reaction multiplex SNaPshot reaction for detection of 16 blood group alleles. BLOOD TRANSFUSION = TRASFUSIONE DEL SANGUE 2013; 12 Suppl 1:s256-63. [PMID: 23736910 DOI: 10.2450/2013.0242-12] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 10/22/2012] [Accepted: 12/11/2012] [Indexed: 11/21/2022]
Abstract
BACKGROUND As an alternative to phenotyping, large-scale DNA-based assays, which are feasible for high-throughput donor red blood cell typing, were developed for determination of blood group polymorphisms. However, high-throughput genotyping platforms based on these technologies are still expensive and the inclusion of single nucleotide polymorphisms and analysis of the alleles depend on the manufacturer's determination. To overcome this limitation and in order to develop an assay to enable the screening of rare donors, we developed a SNaPshot assay for analysis of nine single nucleotide polymorphisms related to antigens that are difficult to assess using conventional serology. MATERIALS AND METHODS The single polymerase chain reaction multiplex SNaPshot reaction was optimized to identify nine single nucleotide polymorphisms determining 16 alleles: KEL*3/KEL*4, KEL*6/KEL*7, DI*1/DI*2, DI*3/DI*4, YT*1/YT*2, CO*1/CO*2, DO*1/DO*2, DO*4, DO*5. We designed a single multiplex PCR with primers encompassing the blood group single nucleotide polymorphisms and performed an internal reaction with probe primers able to discriminate the alleles after fragment analysis. The SNaPshot assay was validated with 140 known alleles previously determined by PCR restriction fragment length polymorphism. RESULTS We were able to simultaneous detect nine single nucleotide polymorphisms defining 16 blood group alleles on an assay based on a multiplex PCR combined with a single base extension using genomic DNA. DISCUSSION This study demonstrates a robust genotyping strategy for conducting rare donor screening which can be applied in blood centers and could be an important tool for identifying antigen-negative donors and, therefore, for providing rare blood.
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Tarazona-Santos E, Castilho L, Amaral DRT, Costa DC, Furlani NG, Zuccherato LW, Machado M, Reid ME, Zalis MG, Rossit AR, Santos SEB, Machado RL, Lustigman S. Population genetics of GYPB and association study between GYPB*S/s polymorphism and susceptibility to P. falciparum infection in the Brazilian Amazon. PLoS One 2011; 6:e16123. [PMID: 21283638 PMCID: PMC3026040 DOI: 10.1371/journal.pone.0016123] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Accepted: 12/14/2010] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Merozoites of Plasmodium falciparum invade through several pathways using different RBC receptors. Field isolates appear to use a greater variability of these receptors than laboratory isolates. Brazilian field isolates were shown to mostly utilize glycophorin A-independent invasion pathways via glycophorin B (GPB) and/or other receptors. The Brazilian population exhibits extensive polymorphism in blood group antigens, however, no studies have been done to relate the prevalence of the antigens that function as receptors for P. falciparum and the ability of the parasite to invade. Our study aimed to establish whether variation in the GYPB*S/s alleles influences susceptibility to infection with P. falciparum in the admixed population of Brazil. METHODS Two groups of Brazilian Amazonians from Porto Velho were studied: P. falciparum infected individuals (cases); and uninfected individuals who were born and/or have lived in the same endemic region for over ten years, were exposed to infection but have not had malaria over the study period (controls). The GPB Ss phenotype and GYPB*S/s alleles were determined by standard methods. Sixty two Ancestry Informative Markers were genotyped on each individual to estimate admixture and control its potential effect on the association between frequency of GYPB*S and malaria infection. RESULTS GYPB*S is associated with host susceptibility to infection with P. falciparum; GYPB*S/GYPB*S and GYPB*S/GYPB*s were significantly more prevalent in the in the P. falciparum infected individuals than in the controls (69.87% vs. 49.75%; P<0.02). Moreover, population genetics tests applied on the GYPB exon sequencing data suggest that natural selection shaped the observed pattern of nucleotide diversity. CONCLUSION Epidemiological and evolutionary approaches suggest an important role for the GPB receptor in RBC invasion by P. falciparum in Brazilian Amazons. Moreover, an increased susceptibility to infection by this parasite is associated with the GPB S+ variant in this population.
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Affiliation(s)
- Eduardo Tarazona-Santos
- Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Lilian Castilho
- Laboratório de Pesquisa em Hemoterapia- Hemocentro Campinas, São Paulo, Brazil
| | - Daphne R. T. Amaral
- Laboratório de Pesquisa em Hemoterapia- Hemocentro Campinas, São Paulo, Brazil
| | - Daiane C. Costa
- Laboratório de Pesquisa em Hemoterapia- Hemocentro Campinas, São Paulo, Brazil
| | - Natália G. Furlani
- Centro de Investigação de Microrganismos, Faculdade de Medicina de São José do Rio Preto, São José do Rio Preto, Brazil
| | - Luciana W. Zuccherato
- Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Moara Machado
- Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Marion E. Reid
- Laboratory of Immunochemistry, Lindsley F. Kimball Research Institute, New York Blood Center, New York, New York, United States of America
| | - Mariano G. Zalis
- Laboratório de Infectologia e Parasitologia Molecular, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Andréa R. Rossit
- Centro de Investigação de Microrganismos, Faculdade de Medicina de São José do Rio Preto, São José do Rio Preto, Brazil
| | - Sidney E. B. Santos
- Laboratório de Genética Humana e Médica, Universidade Federal do Pará, Belem, Brazil
| | - Ricardo L. Machado
- Centro de Investigação de Microrganismos, Faculdade de Medicina de São José do Rio Preto, São José do Rio Preto, Brazil
| | - Sara Lustigman
- Laboratory of Molecular Parasitology, Lindsley F. Kimball Research Institute, New York Blood Center, New York, New York, United States of America
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Sánchez-López JY, Camacho-Torres AL, Ibarra B, Tintos JA, Perea FJ. Analysis of the SLC4A1 gene in three Mexican patients with hereditary spherocytosis: Report of a novel mutation. Genet Mol Biol 2010; 33:9-11. [PMID: 21637597 PMCID: PMC3036091 DOI: 10.1590/s1415-47572009005000109] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2009] [Accepted: 08/17/2009] [Indexed: 11/22/2022] Open
Abstract
We analyzed the SLC4A1 gene in three Mexican patients with Hereditary Spherocytosis (HS). The promoter and all 20 exons were investigated through heteroduplex analysis and DNA sequencing. No DNA changes were detected in one of the three patients. Two well-known polymorphisms, Memphis I and the Diego-a blood group, were detected in another one. In the third, the HS phenotype could be explained by the novel 1885_1888dupCCGG mutation found in heterozygosis. This frameshift mutation is predicted to result in a truncated and unstable protein lacking normal functions.
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Affiliation(s)
- Josefina Y Sánchez-López
- División de Genética, Centro de Investigación Biomédica de Occidente, Instituto Mexicano del Seguro Social, Guadalajara, Jalisco Mexico
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Schawalder A, Hue-Roye K, Castilho L, Chaudhuri A, Reid ME. Analysis in non-human primates reveals that the ancestral Band 3 gene encodes Dib and the Band 3-Memphis phenotype. J Med Primatol 2006; 35:144-8. [PMID: 16764672 DOI: 10.1111/j.1600-0684.2006.00160.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND The anion exchanger, Band 3, carries antigens in the Diego blood group system, and can carry the Band 3-Memphis phenotype. Although Di(b) is of high prevalence and Band 3-Memphis is of low prevalence in humans, it has been suggested that both are on the ancestral gene. We determined the orthologue nucleotide sequences corresponding to these two polymorphic sites, Di(a)/Di(b) (2561T > C; Leu854Pro) and Band 3-Memphis(166A > G; Lys56Glu) in several nonhuman primates. METHODS Genomic DNA was extracted from blood samples of great apes, lesser apes, old world monkeys, new world monkeys and prosimians. PCR amplifications were done with primer pairs that were located in the flanking intronic regions of Exon 4 and Exon 19; and the amplified products were sequenced. RESULTS Amino acid sequence alignment of nonhuman primates band 3 with that of human showed extensive homologies. In exon 4, Glu56Lys polymorphic site showed Glu similar to Band 3-Memphis type and in exon 19, Leu854Pro polymorphic site showed Pro indicating Di(b) phenotype. CONCLUSIONS The nonhuman primates have nucleotide sequences of Di(b)(2561C) in cis to Band 3-Memphis (166G), which is consistent with the assertion that the Di(b) and Band 3-Memphis phenotype represents the ancestral Band 3 gene.
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Affiliation(s)
- Alissa Schawalder
- Immunohematology and Immunochemisry Laboratories, New York Blood Center, New York, NY 10021, USA
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Barton JC, Acton RT, Lovato L, Speechley MR, McLaren CE, Harris EL, Reboussin DM, Adams PC, Dawkins FW, Gordeuk VR, Walker AP. Initial screening transferrin saturation values, serum ferritin concentrations, and HFE genotypes in Native Americans and whites in the Hemochromatosis and Iron Overload Screening Study. Clin Genet 2005; 69:48-57. [PMID: 16451136 DOI: 10.1111/j.1399-0004.2006.00553.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
We compared initial screening transferrin saturation (TfSat) and serum ferritin (SF) phenotypes and HFE C282Y and H63D genotypes of 645 Native American and 43,453 white Hemochromatosis and Iron Overload Screening Study participants who did not report a previous diagnosis of hemochromatosis or iron overload. Elevated measurements were defined as TfSat >50% in men and >45% in women and SF >300 ng/ml in men and >200 ng/ml in women. Mean TfSat was 31% in Native American men and 32% in white men (p = 0.0337) and 25% in Native American women and 27% in white women (p < 0.0001). Mean SF was 153 microg/l in Native American and 151 microg/l in white men (p = 0.8256); mean SF was 55 microg/l in Native American women and 63 microg/l in white women (p = 0.0015). The C282Y allele frequency was 0.0340 in Native Americans and 0.0683 in whites (p < 0.0001). The H63D allele frequency was 0.1150 in Native Americans and 0.1532 in whites (p = 0.0001). We conclude that the screening TfSat and SF phenotypes of Native Americans are similar to those of whites. The allele frequencies of HFE C282Y and H63D are significantly lower in Native Americans than in whites.
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Affiliation(s)
- J C Barton
- Southern Iron Disorders Center, University of Alabama at Birmingham Birmingham, AL 35209, USA.
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