Background: Human blood groups may play a key role in various human diseases. An association has been found between ABO blood groups and both infectious and non-infectious diseases of the gastrointestinal tract and other organs. Dyspepsia is one of the most common encountered gastrointestinal complaints. Aims: To investigate the association between ABO blood groups and severity of dyspepsia symptoms in a specific ethnic group. Study Design: Cross-sectional study. Methods: Consecutive adult Nias tribe dyspepsia outpatients in the General District Hospital, Gunungsitoli Nias,Indonesia, were interviewed using a structured questionnaire between May–June 2018. The severity of dyspepsia was assessed with the Porto Alegre Dyspeptic Symptoms Questionnaire (PADYQ) scoring instrument. ABO blood groups were determined by a standard direct agglutination test. Upper gastrointestinal endoscopy was performed in all participants. Data were statistically analyzed using statistical software. P value less than 0.05 was considered as statistically significant. Results: Of 66 patients, 54.5% were males, with median age of 47 years (range, 23–67). Majority of the participants had blood group O (48.5%). The most encountered dyspepsia symptom was epigastric pain (66.7%). Participants with blood group type B had significantly more severe dyspepsia symptoms based on total PADYQ score (p=0.017). Participants with blood group type O were more prone to epigastric pain (p=0.015), while blood group type B to bloating (p=0.01) and early satiation (p=0.02). Conclusion In outpatients from the Nias tribe with dyspepsia, those with blood group type B had more severe dyspepsia symptoms.
ABO Blood-Group System

The cross-sectional study was conducted on the ABO blood group of 833 medical students in Thai Nguyen. Using the standard blood serum which was produced by National Institute of Hematology and Blood Transfusion. The data of study was analyzed by biological statistic method. Results: The percentage of ABO blood group of Kinh, Tay, Nung, San Diu, Muong minority students was the same in order of common rule: O>B>A>AB; The blood group of H’mong minority students had the percentage of ABO blood group different from the rule, in following order B> O> A> AB.
ABO Blood-Group System ; Students

Biological molecular methods were used to determinate ABO genotype determination. This method allowed extract DNA from biological samples (blood, saliva, hair root) for PCR reaction. Using PCR technique and enzymes, there were 1/3 individuals that have homozygote genotypes AA, BB, OO; 2/3 were heterozygote. In addition, this method could determine samples DNA samples from blood stains, saliva stains and hair root cells... So it has very important role in medical examination.
Methods ; ABO Blood-Group System ; Molecular Biology

OBJECTIVE: Activities of ABO blood group glycosyltransferases in the plasma of blood donors with different blood groups were detected to discover their normal ranges. In addition, the influence of different plasma storage temperatures and time on the enzyme activity was studied, so as to establish a stable ABO blood group glycosyltransferase activity detection technology system for the auxiliary identification of ABO blood groups. METHODS: Detect the activities of glycosyltransferase A (GTA) in plasma of type A, AB and O blood donors, and glycosyltransferase B (GTB) in plasma of type B, AB and O blood donors, respectively, to determine the activity range of GTA and GTB in the plasma of normal blood group under this detection technique. RESULTS: The activities of GTA and GTB in plasma of the same ABO blood groups were relatively consistent, while significant difference was found among different ABO blood groups. The activity of GTA was around 2^7.9±0.3 in plasma of A blood group and 2^8.3±0.5 in plasma of AB blood group. The activity of GTB in plasma of B blood group was about 2^4.4±0.5, and that in plasma of AB blood group was about 2^5.6±0.5. The activities of GTA and GTB in plasma of O blood group were negative. The storage temperature and time of plasma would affect the activities of GTA and GTB. There were no significant changes of the activities of GTA and GTB when the plasma was stored at 4 ℃ for 7 days and -40℃ for 21 days. However, after 28 days of storage at -40 ℃, the activities of GTA and GTB were both decreased significantly. CONCLUSION The preservation condition suitable for the detection of ABO glycosyltransferase activity in plasma samples contain short-term storage at 4 ℃ for one week, and cryopreserved at -40 ℃ for no more than three weeks.
Humans ; ABO Blood-Group System ; Glycosyltransferases

OBJECTIVE: To detect the ABO / RhD blood type of infants younger than 6 months in different gestational age and month old with automatic microcolumn glass sphere and tube method, and compare the result of the two methods. METHODS: The data of 896 samples of infants younger than 6 months from January 2018 to February 2019 was collected. The two methods were used to detect ABO/RhD blood type in all samples and compare the detection rate of ABO/RhD antigen and ABO reverse typing and agglutination intensity of the two methods. RESULTS: Three hundred and eight cases of type A (34.4%), 281 cases of type B (31.4%), 210 cases of type O (23.4%), 97 cases of type AB (10.8%), and 896 positive cases of RhD blood type were detected out by two methods. There were no significant differences of ABO/RhD antigen agglutination intensity between two methods (P > 0.05). Except for type AB, the detection rate of ABO reverse typing in infants with type B was significantly higher than that with type A and type O (P < 0.05). The agglutination intensity of type A reverse cell was higher than type B reverse cell (P < 0.05). The fully automatic microcolumn glass sphere method exhibited higher detection rate of ABO reverse typing in the samples of type A and type O group and agglutination intensity of ABO reverse typing in all types as compared with the tube method (P < 0.05). The detection rate and agglutination intensity of ABO reverse typing in term group were significantly higher than those in preterm group (P < 0.05). The fully automatic microcolumn glass sphere method exhibited higher detection rate of ABO reverse typing and agglutination intensity compared with the tube method between two groups (P < 0.05). The detection rate and agglutination intensity of ABO reverse typing in group IV (4-6 months old) were significantly higher than those in groups I, II and III (young than 3 months old) (P < 0.05). The fully automatic microcolumn glass sphere method exhibited higher detection rate of ABO reverse typing in I, II, III groups and agglutination intensity of ABO reverse typing in the 4 groups compared with the tube method (P < 0.05). CONCLUSION ABO / RhD blood group antigen can be accurated detected in majority of infants, but the detection rate of ABO antibody is related to gestational age and month age of infants. The detection rate and agglutination intensity of the fully automatic microcolumn glass sphere method in ABO reverse typing are higher than those of the tube method, especially for premature infants and children within 3 months old.
ABO Blood-Group System ; Blood Grouping and Crossmatching ; Humans ; Infant

ABO Blood-Group System ; Erythroblastosis, Fetal ; epidemiology ; Humans ; Infant, Newborn

OBJECTIVE To explore the molecular mechanism for a blood sample with mixed-field hemagglutination upon determination of ABO blood group. METHODS Serological techniques were employed to identify the erythrocyte phenotype. The A and B antigens were detected by flow cytometry. The preliminary genotype of ABO gene was assayed with sequence-specific primer-polymerase chain reaction (PCR-SSP). Exons 6 and 7 of the ABO gene were amplified with PCR and analyzed by direct sequencing. Haplotypes of the ABO gene were analyzed by cloning sequencing as well. RESULTS The serological reaction pattern has supported an O phenotype when all the tubes were centrifuged for the first time. However, a mixed-field hemagglutination of red blood cells (RBCs) with anti-A antibodies was present after the tube was centrifuged five times later. A antigens were detected on the surface of partial red blood cells of the sample by flow cytometry. PCR- SSP results have shown that the preliminary ABO genotype was A/O. Analysis of the fragments of exons 6 and 7 of the ABO gene has indicated that heterozygosis lied as follows: 261G/A, 425T/T, 467C/T, 646A/T, 681A/G, 745C/T, 771C/T, 829A/G, conjecturing the genotype to be A307/O02, which was confirmed by haplotype sequence analysis. Compared with A101 allele, A307 allele has two missense mutations, 467C> T and 745C> T, which have resulted in substitutions Pro156Leu and Arg249Trp in the A glycosyltransferase polypeptide chain. CONCLUSION A variant allele (A307) has been identified for the first time in mainland China, which is responsible for the formation of A3 phenotype.
ABO Blood-Group System ; genetics ; Adult ; Genotype ; Humans ; Male ; Phenotype

OBJECTIVE: To explore the correlation between special A/O genotype and the O phenotype. METHODS: Group O samples with partially reduced or lack of isoagglutinins were collected to determinate the ABO genotype with a PCR-sequence specific primer (PCR-SSP) assay. Seven samples with A/O genotype were selected for further study. Serological tests including forward and reverse typing, H antigen determination and adsorption/elution were carried out with a tube method. Genomic DNA was genotyped by amplifying and sequencing of the coding regions of exons 1 to 7 of the ABO gene. RESULTS: Seven samples were serotyped as group O by the forward typing test. However, reduced anti-A activity was found in 5 samples by the reverse typing test, reduced anti-A and anti-B activities were found in 1 sample, and no anti-A isoagglutinin activity was found with 1 sample. H antigen was determined in all samples by routine serologic method. Neither anti-A nor anti-B was eluted from red cells derived from all samples. Three samples were genotyped as Ael02/O02, whilst the remainders were Ael02/O13, Ael02/O65, Am04/O75, Ael06/O02, respectively. CONCLUSION Special A/O genotype may not express the A antigen, leading to the generation of group O red cells. Reduced or missed anti-A activity is the typical serological feature of this special group of O phenotype, for which ABO*Ael02 and ABO*O02 are the major alleles. Group O individuals with isoagglutinin detection problem should be grouped by serological tests and genomic DNA analysis.
ABO Blood-Group System ; Alleles ; Exons ; Genotype ; Humans ; Phenotype

OBJECTIVE: To delineate the serological and molecular profiles of a patient with A(w)37B subtype. METHODS: The ABO bloodtypes of the proband, his wife and daughter were determined with a standard serological method. Their ABO genotypes were determined by sequence-specific primer polymerase chain reaction (PCR-SSP). All exons of the ABO gene were directly sequenced. Exons 6 and 7 of the ABO gene were further analyzed by cloning and sequencing. RESULTS: The red blood cells of the proband showed a weak B phenotype. His serum sample contained weak reactive anti-A antibody, which was defined as A(w)B blood group based on the serological characteristics. The A and B alleles were detected by blood group genotyping. Gene cloning and sequencing have identified a characteristic c.940A>G variant (ABO*AW.37) in exon 7 of the ABO gene, which resulted in substitution of Lysine by Glutamate at position 314. The proband's daughter has inherited the ABO*AW.37 allele. CONCLUSION The c.940A>G variant in exon 7 of the ABO gene probably underlay the decreased activity of GTA transferase and resulted in the Aw37 phenotype.
ABO Blood-Group System/genetics* ; Alleles ; Genotype ; Humans ; Pedigree ; Phenotype

OBJECTIVE: To analyze the blood type of a family with B(A) blood type. METHODS: The serological blood type of the family was determined by routine tube method. Exons 6 and 7 of the ABO gene were amplified by PCR and subjected to Sanger sequencing. RESULTS: Serological testing of the proband and her elder son showed a discrepancy which was initially identified as B(A) subtype. Her husband and second son were identified as blood type O. Sequencing of the proband and her elder son has identified an O allele and a 640A>G mutation compared with the B gene. Her husband and second son possessed the same genotype of O/O. CONCLUSION The 640A>G mutation of ABO gene probably underlies the B(A) subtype.
ABO Blood-Group System ; Alleles ; Exons ; Female ; Genotype ; Humans ; Phenotype