Study on the extensibility of platelet donor gene database in Shaanxi / 中国输血杂志

【Objective】 To analyze the commonality and characteristics between voluntary blood donors and hematopoietic stem cell donors in this region, and explore the potential for integration and development between China Marrow Donors Program (CMDP) and voluntary blood donors, especially platelet donor databases, so as to improve recruitment success rate and inventory rate. 【Methods】 The database modeling and comparison methods were used to screen and stratify the matching and integration degree between the voluntary blood donors in recent 10 years and the marrow donors in the Shaanxi Branch of CMDP. The frequencies of HLA-A,-B alleles, HPA alleles and haplotypes were calculated with Arlequin 3. 5. 2. 2 software, and the matching probability of different platelet donor reserve pools was conducted according to the phenotypic frequencies. 【Results】 Among the voluntary donors with known HLA genotypes in this region, according to their blood donation behavior,the active blood donors excavated were divided into the first, second, third and fourth echelons of platelet donor reserve pools, with 696, 2 752, 9 092 and 12 028 donors, respectively. The first echelon had the highest proportion of 10-50 times of platelet donations and 10-20 times of whole blood donations, with 13.65% and 26.01%, respectively. The second echelon had 10-20 times of whole blood donations and 10-50 times of platelet donations, accounted for 15.04% and 1.38%, respectively, which were significantly different from other echelons' blood donation characteristics (P<0.05). With a database size of the existing platelet donor bank adding the first and second echelons (n=4 955), there was a 69.02% probability of matching at least one donor with matching HLA-A-B phenotype. When considering the matching ABO and HPA phenotypes, the probability of finding at least one donor with fully matching HLA, HPA and ABO isotype (type B as an example) was 48. 73%. 【Conclusion】 The three groups of whole blood donation, apheresis platelet donation and marrow donation in Xi'an area have a large cross-distribution. Compared with expanding the storage capacity from scratch, the active blood donors in CMDP database are the largest back-up force of platelet donors. While expanding the effective storage capacity, it can minimize the cost of building platelet donor bank and the demand for resources.

The capacity evaluation and utilization strategy of the platelet donor database with known HLA/HPA genotype in Shaanxi / 中国输血杂志

【Objective】 To evaluate the appropriate optimal capacity and matching probability of the platelet donor database with known HLA/HPA genotype in Shaanxi aera, and provide data support for subsequent construction, maintenance and application of the local platelet donor database. 【Methods】 A total of 11 755 individuals from the Shaanxi Branch of China Marrow Donor Program, 401 and 249 unrelated random platelet donors in Shaanxi aera were enrolled to the population study of HLA-A, -B polymorphisms, HPA genotyping and CD36 antigen expression, respectively. The frequencies of HLA-A, -B alleles, HPA alleles and haplotypes were calculated with Arlequin 3. 5. 2. 2 software; matching probability and capacity evaluation of platelet donor database was conducted according to the phenotypic frequencies. 【Results】 The population genetic and phenotypic polymorphisms data of HLA-A, -B and HPA1-6, 10, 15, 21 in Shaanxi aera were obtained. The frequency of CD36 type Ⅰ or Ⅱ deficiency was 0.40%(1/249). According to the subsequent calculating and deriving, with a database size of 194 donors, the patient having approximate 95% probability could achieve matching of HPA1-6, 10, 15, 21 genotype. With a database size of 1500 donors, there is a 95% probability of matching at least one donor with HLA-A-B phenotype frequency >0.002 or haplotype frequency >0.001; meanwhile, the probability of matching a cross-reactive group donor should be 44.95%-97.57%. Based on database size of 8 856 and 15 033, the probabilities of matching HLA-A, -B phenotype were about 80% and 90%, respectively. 【Conclusion】 The differences in the distribution of HLA/HPA polymorphism in different regions make the establishment mode and optimal capacity of platelet donor database different. It is necessary to apply a variety of platelet matching transfusion strategies to expand the range of donor selection, thereby effectively reducing the database construction cost and resource requirements.

Characterization of a rare HLA-C*08:84 allele and analysis of its 3-D molecular structure / 中华医学遗传学杂志

OBJECTIVE@#To verify a rare allele of human leukocyte antigen (HLA) and analyze its inheritance and 3D molecular structure.@*METHODS@#PCR-sequence-based typing, PCR-single strand oligonucleotide polymorphism and single allele-specific sequencing were carried out to characterize the rare HLA-C allele and its transmission in the family. Its protein structure was modeled by using SWISS-MODEL, Phyre2 and FATCAT software.@*RESULTS@#Analysis indicated that the rare allele (HLA-C*08:84) has transmitted from the proband's mother and has differed from HLA-C*08:01 by a single base (g.512G>C), resulting in substitution of an amino acid (p.Trp147Ser). Modeling of the 3D structure of the encoded protein indicated that the amino acid residue variation is located at the alpha 2 helix, which participates the formation of pocket F. Modeling of the structures of C*08:84, C*08:01, C*08:02, C*08:03 and C*08:22 has suggested significant variation in the peptide binding regions of the backbone, with root mean square errors being 1.70 nm, 1.79 nm, 0.71 nm and 1.70 nm, respectively.@*CONCLUSION@#A rare HLA-C*08:84 allele has been identified, and its clinical significance has been analyzed.

Association of HLA-DRB1, -DQB1, -DPB1 alleles and haplotype polymorphisms with acute myeloid leukemia (non-M3) in northern Han population / 中国输血杂志

【Objective】 To explore the association of HLAII(-DRB1, -DQB1, -DPB1) alleles and haplotypes polymorphisms with acute myeloid leukemia (AML) in northern Han population. 【Methods】 A total of 308 AML (non-M3) patients (patient group) and 824 unrelated healthy bone marrow donors (control group) were genotyped at a high-resolution level using polymerase chain reaction-sequence-based typing (PCR-SBT), next-generation sequencing (NGS) with Ion Torrent S5 platform and sequence specific oligonueleotide probes (SSO) with LABScan® 3D platform. Frequencies of HLA II alleles and haplotypes were calculated with Arlequin 3.5.2.2 software. The odds ratio (OR) of AML was also calculated for case-control study. 【Results】 By χ2 test and correction, an increased frequency of HLA-DRB1*07∶01(14.61% vs 9.53%, P<0.01), HLA-DQB1*02∶02(12.82% vs 8.31%, P<0.01), HLA-DQB1*06∶02(11.53% vs 8.74%, P<0.05) and HLA-DPB1*17∶01(5.84% vs 3.16%, P<0.01) among AML patients was discovered in significant comparison with the control group. After Bonferroni correction, the frequency of HLA-DRB1*07∶01(Pc<0.05), HLA-DQB1*02: 02(Pc<0.05) and HLA-DPB1*17∶01(Pc<0.05) in AML patients were still higher than those in the control group, which had a strong positive correlation with AML (OR=1.62 (95% CI=1.23~2.14), 1.62(95% CI=1.21~2.18) and 1.91(95% CI=1.23~2.94), respectively. The frequency of two loci haplotype HLA-DRB1*07∶01-DQB1*02∶02 in AML patients was still higher than that of the control group after Bonferroni correction (12.66% vs 8.19%, Pc<0.05). The frequency of the 3 loci haplotype HLA-DRB1*07∶01-DQB1*02∶02-DPB1*17∶01, as a susceptible haplotype of AML, was higher than that of the control group and was strongly correlated with AML. 【Conclusion】 The data on the association of HLA II (-DRB1, -DQB1, -DPB1) alleles and haplotype polymorphisms with AML in northern Han populations was obtained in this study. HLA-DRB1*07∶01, HLA-DQB1*02∶02, HLA-DPB1*17∶01 and the HLA-DRB1*07∶01-DQB1*02∶02-DPB1*17∶01 haplotype are the risk genes and susceptible extended haplotype for AML. The risk prediction based on HLA haplotype might be more accurate than that based on single allele.

DNA-PK inhibition by M3814 enhances chemosensitivity in non-small cell lung cancer

A significant proportion of non-small cell lung cancer (NSCLC) patients experience accumulating chemotherapy-related adverse events, motivating the design of chemosensitizating strategies. The main cytotoxic damage induced by chemotherapeutic agents is DNA double-strand breaks (DSB). It is thus conceivable that DNA-dependent protein kinase (DNA-PK) inhibitors which attenuate DNA repair would enhance the anti-tumor effect of chemotherapy. The present study aims to systematically evaluate the efficacy and safety of a novel DNA-PK inhibitor M3814 in synergy with chemotherapies on NSCLC. We identified increased expression of DNA-PK in human NSCLC tissues which was associated with poor prognosis. M3814 potentiated the anti-tumor effect of paclitaxel and etoposide in A549, H460 and H1703 NSCLC cell lines. In the four combinations based on two NSCLC xenograft models and two chemotherapy, we also observed tumor regression at tolerated doses

Association of HLA-A, -B, -DRB1 alleles and haplotypes with acute lymphoblastic leukemia among ethnic Hans from northern China / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To assess the association of polymorphisms of human leukocyte antigen (HLA)-A, -B, -DRB1 alleles and haplotypes with acute lymphoblastic leukemia (ALL) among ethnic Hans from northern China.</p><p><b>METHODS</b>A total of 170 ALL patients (patient group) and 1241 unrelated healthy bone marrow donors (control group) were genotyped at a high-resolution level using polymerase chain reaction-sequence-based typing (PCR-SBT), sequence specific oligonucleotide probes (SSO) and sequence specific primer (SSP) typing methods. Frequencies of HLA alleles and haplotypes were calculated with Arlequin 3.5.2 software. The distribution of genes and haplotypes were analyzed through a case-control study, and the odd ratio (OR) of ALL was also calculated.</p><p><b>RESULTS</b>By cha-square test and correction, an increased frequency of B*13:01 and B*40:02 among ALL patients was discovered in comparison with the controls (7.35% vs. 4.63%, P=0.030; 2.94% vs. 1.45%, P=0.042), whereas B*35:03 and B*46:01 were less frequent compared with the controls (0.29% vs. 1.69%, P=0.048; 4.41% vs. 7.82%, P=0.025). Although the above discrepancies were not statistically significant by Bonferroni correction, within DRB1*15 group, the frequency of DRB1*15:01 in ALL patients was significantly greater than that of the controls (16.18% vs. 10.19%, Pc'=0.041) and was correlated with ALL (OR=1.70, 95% CI:1.24-2.33). Nineteen haplotypes identified in the ALL patients had a frequency greater than those of the controls. Of these, 11 were absent from the control group and were correlated with ALL.</p><p><b>CONCLUSION</b>The association of HLA-A, -B, -DRB1 polymorphisms with ALL was determined among patients from northern Chinese Hans. The correlation between DRB1*15:01 and ALL suggested that DRB1*15:01 may be a susceptibility gene for ALL with its particular haplotypes.</p>

Sequence Analysis and Identification of A Novel HLA-A* 2 4∶3 2 7 Allele Been Designated by the HLA Nomenclature Committee of WHO / 现代检验医学杂志

Objective To do analysis of sequence and identify a novel HLA-A allele in Chinese hematopoietic stem cell do-nors.Methods A rare HLA-A allele was initially detected by Luminex PCR-SSO typing,then the sample was sequenced by sequence-based typing (SBT)and the group-specific sequencing primer (GSSP)to confirm the mutation allele and locus.Re-sults The sequence of the sample results showed that the allele compared with the highest homologous allele HLA-A*24∶02∶01∶01 was the difference in the exon 3 at position 544 G>A,resulting in an amino acid sequence of HLA-A*24∶02∶01∶01 at position 158 change Ala to Thr.Conclusion This allele is a new HLA-A allele and has been designated as HLA-A*24∶327 by the HLA Nomenclature Committee of World Health Organization (WHO).

Identification of a novel T421C mutation of α-1,3-N-acetylgalactosaminyltransferase allele responsible for an A variant / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To investigate the molecular basis of an individual featuring weak A phenotype of ABO blood group system.</p><p><b>METHODS</b>Serologic investigations, serum transferases activity assay and absorption-elution test were carried out to identify the ABO blood group. The 7 exons and flanking introns of ABO glycosyltransferase gene were amplified with polymerase chain reaction (PCR). The products were sequenced bidirectinally following enzyme digestion. Haplotypes of exons 6 and 7 of the ABO gene were analyzed.</p><p><b>RESULTS</b>A weak A antigen was identified on red blood cells of the proband. Eight heterozygous sites in exons 6 and 7 (261delG 297A/G, 421C/T, 467C/T, 646T/A, 681G/A, 771C/T, 829G/A) of the ABO gene were identified. Based on haplotype analysis, one allele was determined as O02, while a novel mutation 421T>C was identified in another allele, which resulted in the amino acid change Ser141Pro of the A glycosyltransferase.</p><p><b>CONCLUSION</b>Above results suggested that amino acid substitutions resulted from a novel mutation 421T>C of the ABO gene may decrease the enzymatic activity and result in the weak A phenotype.</p>

Analysis of frequency of a RHD1227A allele in Chinese Hans / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To determine the frequency of RHD1227A allele in Chinese Hans.</p><p><b>METHODS</b>For a total of 890403 ethnic Han blood donors, the D antigen was determined with a saline method and indirect antiglobulin test. The RHD1227A allele and number and type of zygosity of RHD gene were determined with PCR sequence specific primer (PCR-SSP). Allelic frequency was calculated through statistics.</p><p><b>RESULTS</b>In total 2385 donors were found to be Rh-negative, 108 individuals were found to be weakly positive for D antigen (including weak D and partial D phenotypes). The remaining 887 910 individuals were Rh-positive. Among the Rh-negative individuals, 516 were found with RHD1227A. Among these, 467 were RHD1227A/d and 49 were RHD1227A/RHD1227A. Two of 108 D antigen weak-positive individuals were found as RHD1227A/RHD+. In addition, 8 of 1073 random Rh-positive samples were found to be RHD1227A/RHD+. The allele frequency of RHD1227A in the population was calculated as 0.004 036. The figure should be 0.006 682 if calculated based on the detected rate of the allele in Rh-negative individuals, and 0.007 884 if calculated based on the reported average phenotype rate of DEL in Rh-negative individuals.</p><p><b>CONCLUSION</b>By taking main influencing factors such as the RHD zygosity, the rate of RHD1227A and DEL phenotype may be determined. The allele frequency of RHD1227A in Chinese Hans is between 0.004 036 and 0.007 884.</p>