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Lei H, Zhang H, Guo L, Xiang D, Wang X, Liu X, Cai X. Identification of a novel variant c.761C>T on ABO*B.01 gene in ABO glycosyltransferases associated with B weak phenotype. Vox Sang 2023; 118:895-900. [PMID: 37563965 DOI: 10.1111/vox.13511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 06/11/2023] [Accepted: 07/27/2023] [Indexed: 08/12/2023]
Abstract
BACKGROUND AND OBJECTIVES ABO antigens are produced from H antigen by the activity of glycosyltransferase enzyme encoded by the ABO gene. Variants in the ABO gene can produce a weak ABO phenotype. In this study, we identify a novel ABO*BW allele and investigate the underlying mechanism leading to the Bweak phenotype. MATERIALS AND METHODS The ABO phenotype and genotype of the sample were determined using serological and direct DNA sequencing methods. We assessed the impact of the novel variant by three-dimensional modelling to predict protein stability changes (ΔΔG), and carried out an in vitro expression assay. The total glycosyltransferase transfer capacity in the supernatant of transfected cells was also examined. RESULTS Serological analysis confirmed the Bweak phenotype in the subject, and gene sequencing identified a novel variant c.761C>T (p.A254V) on the ABO*B.01 allele, resulting in a BW-var/O.01.02 genotype. In silico analysis suggested that the p.A254V variant on the B allele may reduce the stability of glycosyltransferase B (GTB), as indicated by the ΔΔG values. In vitro expression studies showed that the variant p.A254V impaired H to B antigen conversion, although it did not affect the expression of GTB. CONCLUSION We identified a novel BW allele and demonstrated that the variant c.761C>T (p.A254V) can cause the Bweak phenotype by reducing the stability of GTB.
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Affiliation(s)
- Hang Lei
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Blood Transfusion Department, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Hui Zhang
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Blood Transfusion, Minhang Hospital, Fudan University, Shanghai, China
| | - Liujun Guo
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Blood Transfusion Department, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Dong Xiang
- Blood Group Reference Laboratory, Shanghai Institute of Blood Transfusion, Shanghai Blood Center, Shanghai, China
| | - Xuefeng Wang
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Blood Transfusion Department, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xi Liu
- Blood Group Reference Laboratory, Shanghai Institute of Blood Transfusion, Shanghai Blood Center, Shanghai, China
| | - Xiaohong Cai
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Blood Transfusion Department, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Kominato Y, Sano R, Takahashi Y, Hayakawa A, Ogasawara K. Human ABO gene transcriptional regulation. Transfusion 2020; 60:860-869. [PMID: 32216153 PMCID: PMC7187371 DOI: 10.1111/trf.15760] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2019] [Revised: 02/06/2020] [Accepted: 02/23/2020] [Indexed: 12/18/2022]
Affiliation(s)
- Yoshihiko Kominato
- Department of Legal Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Rie Sano
- Department of Legal Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Yoichiro Takahashi
- Department of Legal Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Akira Hayakawa
- Department of Legal Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan
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Sano R, Nogawa M, Nakajima T, Takahashi Y, Takahashi K, Kubo R, Kominato Y, Yokohama A, Tsukada J, Yamao H, Kishida T, Ogasawara K, Uchikawa M. Blood group B gene is barely expressed in in vitro erythroid culture of Bm-derived CD34+ cells without an erythroid cell-specific regulatory element. Vox Sang 2014; 108:302-9. [PMID: 25523606 DOI: 10.1111/vox.12220] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 09/15/2014] [Accepted: 10/15/2014] [Indexed: 11/25/2022]
Abstract
BACKGROUND AND OBJECTIVES Previously, a weak phenotype Am or Bm was assumed to be caused by a reduction of A or B gene expression in bone marrow cells, but not in mucus-secreting cells. However, ABO expression has not been examined in erythroid progenitor cells of Am or Bm individuals. MATERIALS AND METHODS We carried out in vitro erythroid differentiation of CD34(+) cells from peripheral blood of a Bm individual harbouring a 3.0-kb deletion including an erythroid cell-specific regulatory element, named the +5.8-kb site, in intron 1 of the human ABO blood group gene. RESULTS During the in vitro differentiation of CD34(+) cells from this Bm individual into erythroid cells, B-antigens were not detectable on the cultured cells by flow cytometric analysis, and allele-specific RT-PCR consistently detected the transcripts from the O allele, but not from the B allele. Moreover, chromatin immunoprecipitation assay demonstrated that both RUNX1 and GATA-2 or GATA-1 were bound to the +5.8-kb site in cultured erythroid cells expressing ABO. CONCLUSION It is likely that the +5.8-kb site enhances transcription from the ABO promoter in erythroid cells through binding of RUNX1 and GATA-2 or GATA-1.
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Affiliation(s)
- R Sano
- Legal Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan
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Takahashi Y, Isa K, Sano R, Nakajima T, Kubo R, Takahashi K, Kominato Y, Michino J, Masuno A, Tsuneyama H, Ito S, Ogasawara K, Uchikawa M. Presence of nucleotide substitutions in transcriptional regulatory elements such as the erythroid cell-specific enhancer-like element and theABOpromoter in individuals with phenotypes A3and B3, respectively. Vox Sang 2014; 107:171-80. [DOI: 10.1111/vox.12136] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 01/17/2014] [Accepted: 01/24/2014] [Indexed: 12/22/2022]
Affiliation(s)
- Y. Takahashi
- Department of Legal Medicine; Gunma University Graduate School of Medicine; Maebashi-shi Japan
| | - K. Isa
- Japanese Red Cross Central Blood Institute; Tokyo Japan
| | - R. Sano
- Department of Legal Medicine; Gunma University Graduate School of Medicine; Maebashi-shi Japan
| | - T. Nakajima
- Department of Legal Medicine; Gunma University Graduate School of Medicine; Maebashi-shi Japan
| | - R. Kubo
- Department of Legal Medicine; Gunma University Graduate School of Medicine; Maebashi-shi Japan
| | - K. Takahashi
- Department of Legal Medicine; Gunma University Graduate School of Medicine; Maebashi-shi Japan
| | - Y. Kominato
- Department of Legal Medicine; Gunma University Graduate School of Medicine; Maebashi-shi Japan
| | - J. Michino
- Department of Blood Transfusion Service; Toyama University Hospital; Toyama Japan
| | - A. Masuno
- Japanese Red Cross Kanto-Koshinetsu Block Blood Center; Tokyo Japan
| | - H. Tsuneyama
- Japanese Red Cross Kanto-Koshinetsu Block Blood Center; Tokyo Japan
| | - S. Ito
- Japanese Red Cross Touhoku Block Blood Center; Miyagi Japan
| | - K. Ogasawara
- Japanese Red Cross Central Blood Institute; Tokyo Japan
| | - M. Uchikawa
- Japanese Red Cross Central Blood Institute; Tokyo Japan
- Japanese Red Cross Kanto-Koshinetsu Block Blood Center; Tokyo Japan
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Takahashi Y, Isa K, Sano R, Nakajima T, Kubo R, Takahashi K, Kominato Y, Tsuneyama H, Ogasawara K, Uchikawa M. Deletion of the RUNX1 binding site in the erythroid cell-specific regulatory element of the ABO gene in two individuals with the Am phenotype. Vox Sang 2013; 106:167-75. [PMID: 23992526 DOI: 10.1111/vox.12077] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Revised: 08/02/2013] [Accepted: 08/05/2013] [Indexed: 11/28/2022]
Abstract
BACKGROUND AND OBJECTIVES An erythroid cell-specific regulatory element, referred to as the +5·8-kb site, had been identified in the first intron of the human ABO blood group gene. Subsequent studies revealed that either a 5·8-kb deletion including the +5·8-kb site or disruption of a GATA factor binding motif at the site was present in all Bm and ABm individuals examined. We investigated the molecular mechanism of the Am phenotype, which is analogous to the Bm phenotype. MATERIALS AND METHODS Genomic DNAs were prepared from peripheral blood of two Am individuals, and the nucleotide sequences were investigated using PCR and direct sequencing. Electrophoretic mobility shift assay (EMSA) and promoter assay with K562 cells were carried out. RESULTS A novel 23-bp nucleotide deletion was found at the +5·8-kb site in both individuals. EMSAs demonstrated binding of the transcription factor RUNX1 to the nucleotides within the deletion. Promoter assays showed that the deletion reduced the transcriptional activity of the +5·8-kb site. CONCLUSION Deletion of the 23-bp nucleotides including the RUNX1 binding site decreases transcription of the A allele, resulting in the reduction in A antigen expression in the Am phenotype.
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Affiliation(s)
- Y Takahashi
- Department of Legal Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan
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Nakajima T, Sano R, Takahashi Y, Kubo R, Takahashi K, Kominato Y, Tsukada J, Takeshita H, Yasuda T, Uchikawa M, Isa K, Ogasawara K. Mutation of the GATA site in the erythroid cell-specific regulatory element of the ABO gene in a Bm subgroup individual. Transfusion 2013; 53:2917-27. [PMID: 23560502 DOI: 10.1111/trf.12181] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 01/29/2013] [Accepted: 02/03/2013] [Indexed: 12/31/2022]
Abstract
BACKGROUND The ABO blood group is important in blood transfusion. Recently, an erythroid cell-specific regulatory element has been identified in the first intron of ABO using luciferase reporter assays with K562 cells. The erythroid cell-specific regulatory activity of the element was dependent upon GATA-1 binding. In addition, partial deletion of Intron 1 including the element was observed in genomic DNAs obtained from 111 Bm and ABm individuals, except for one, whereas the deletion was never found among 1005 individuals with the common phenotypes. STUDY DESIGN AND METHODS In this study, further investigation was performed to reveal the underlying mechanism responsible for reduction of B antigen expression in the exceptional Bm individual. Peptide nucleic acid-clamping polymerase chain reaction was carried out to amplify the B-related allele, followed by sequence determination. Electrophoretic mobility assays and promoter assays were performed to examine whether a nucleotide substitution reduced the binding of a transcription factor and induced loss of function of the element. RESULTS Sequence determination revealed one point mutation of the GATA motif in the element. The electrophoretic mobility shift assays showed that the mutation abolished the binding of GATA transcription factors, and the promoter assays demonstrated complete loss of enhancer activity of the element. CONCLUSION These observations suggest that the mutation in the GATA motif of the erythroid-specific regulatory element may diminish the binding of GATA transcription factors and down regulate transcriptional activity of the element on the B allele, leading to reduction of B antigen expression in erythroid lineage cells of the Bm individual.
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Affiliation(s)
- Tamiko Nakajima
- Department of Legal Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan; Cancer Chemotherapy Center and Hematology, University of Occupational and Environmental Health, Fukuoka, Japan; Department of Legal Medicine, Shimane University School of Medicine, Shimane, Japan; Division of Medical Genetics and Biochemistry, Faculty of Medicine, University of Fukui, Fukui, Japan; Japanese Red Cross Tokyo Blood Center, Tokyo, Japan; Japanese Red Cross Central Blood Institute, Tokyo, Japan
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Hosseini-Maaf B, Hellberg A, Chester MA, Olsson ML. An extensive polymerase chain reaction-allele-specific polymorphism strategy for clinical ABO blood group genotyping that avoids potential errors caused by null, subgroup, and hybrid alleles. Transfusion 2008; 47:2110-25. [PMID: 17958541 DOI: 10.1111/j.1537-2995.2007.01436.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND ABO genotyping is complicated by the remarkable diversity at the ABO locus. Recombination or gene conversion between common alleles may lead to hybrids resulting in unexpected ABO phenotypes. Furthermore, numerous mutations associated with weak subgroups and nondeletional null alleles should be considered. All known ABO genotyping methods, however, risk incorrect phenotype predictions if any such alleles are present. STUDY DESIGN AND METHODS An extensive set of allele-specific primers was designed to accomplish hybrid-proof multiplex polymerase chain reaction (PCR) amplification of DNA fragments for detection of ABO alleles. Results were compared with serologic findings and ABO genotypes defined by previously published PCR-restriction fragment length polymorphism/PCR-allele-specific polymorphism (ASP) methods or DNA sequencing. RESULTS Phenotypically well-characterized samples from blood donors with common blood groups and rare-subgroup families were analyzed. In addition to the commonly encountered alleles (A1, A1(467C>T), A2, B, O1, O1v, and O2), the new method can detect hybrid alleles thanks to long-range amplification across intron 6. Four of 12 PCR-ASP procedures are used to screen for multiple infrequent subgroup and null alleles. This concept allows for a low-resolution typing format in which the presence of, for example, a weak subgroup or cis-AB/B(A) is indicated but not further defined. In an optional high-resolution step, more detailed genotype information is obtained. CONCLUSION A new genotyping approach has been developed and evaluated that can correctly identify ABO alleles including nondeletional null alleles, subgroups, and hybrids resulting from recombinational crossing-over events between exons 6 and 7. This approach is clinically applicable and decreases the risk for erroneous ABO phenotype prediction compared to previously published methods.
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Affiliation(s)
- Bahram Hosseini-Maaf
- Division of Hematology and Transfusion Medicine, Department of Laboratory Medicine, Lund University and Blood Center, Lund University Hospital, Lund, Sweden
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Lin M, Hou MJ, Twu YC, Yu LC. A novel A allele with 664G>A mutation identified in a family with the Am phenotype. Transfusion 2005; 45:63-9. [PMID: 15647020 DOI: 10.1111/j.1537-2995.2005.04132.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND The Am phenotype has been characterized as a weak expression of the A antigen on red blood cells but the presence of a normal quantity of the A antigen in saliva. This study describes a molecular genetic analysis of members of an Am family. STUDY DESIGN AND METHODS The eight exon regions of the ABO genes of the Am proposita were amplified by polymerase chain reaction and cloned, and their sequences were analyzed. The alpha-1,3-N-acetylgalactosaminyltransferase (A-transferase) activities of the Am serum and the expressed Am transferase were analyzed. RESULTS An A gene with a 664G>A mutation, which predicts an amino acid alteration of Val222Met, was identified in the Am proposita. This Am664A allele was demonstrated in other three family members with the Am phenotype. The A-transferase activity was virtually undetectable in the Am sera, and the expressed Am transferase showed weak A-transferase activity, when compared with the expressed A1 transferase, in assays that use acceptor substrates mimicking the Type 2 H structure and Type 1 H structure. CONCLUSION A novel A allele with 664G>A mutation was demonstrated in a pedigree with the Am phenotype. The mechanism leading to the formation of the Am phenotype still awaits elucidation.
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Affiliation(s)
- Marie Lin
- Transfusion Medicine Laboratory, Mackay Memorial Hospital, Taipei, Taiwan
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Lin PH, Li L, Lin-Tsai SJ, Lin KT, Chen JM, Chu DC. A unique 502C>T mutation in exon 7 of ABO gene associated with the Bel phenotype in Taiwan. Transfusion 2003; 43:1254-9. [PMID: 12919428 DOI: 10.1046/j.1537-2995.2003.00494.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND The ABO system includes many variant subgroups. Some of them are difficult to identify serologically, leading to mistyping of blood groups. For example, Bel is often typed as O blood group. STUDY DESIGN AND METHODS DNA sequencing and a molecular approach were explored to accurately determine the genotypes of Bel subgroups. Seven Bel blood donors and 106 individuals with other blood groups were analyzed serologically and molecularly. RESULTS The serologic results of these seven Bel blood donors showed that their RBCs do not react with anti-B or anti-A,B, and their B antigen was detected by adsorption and elution methods. Sequencing results for exons 6 and 7 of ABO genes showed a new Bel allele with a C>T substitution at nucleotide position 502 in exon 7 of the ABO gene in all seven cases but not in other blood groups. Consequently, an amplification-created restriction site protocol was designed to detect the 502C>T genotype in Bel subgroup cases. CONCLUSION A novel 502C>T mutation was found in the Bel subgroup in Taiwan and successfully developed a rapid and accurate molecular protocol to detect this mutation. To our knowledge, the new Bel allele that was found is unique in Taiwanese residents.
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Affiliation(s)
- P-H Lin
- Taipei Blood Center, Chinese Blood Service Foundations, Taipei, Taiwan
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