Risk factors for hemorrhagic cystitis in children with β-thalassemia major after allogeneic hematopoietic stem cell transplantation / 中国当代儿科杂志

OBJECTIVES@#To explore the risk factors for hemorrhagic cystitis (HC) in children with β-thalassemia major (TM) undergoing allogeneic hematopoietic stem cell transplantation (allo-HSCT).@*METHODS@#A retrospective analysis was conducted on clinical data of 247 children with TM who underwent allo-HSCT at Shenzhen Children's Hospital from January 2021 to November 2022. The children were divided into an HC group (91 cases) and a non-HC group (156 cases) based on whether HC occurred after operation. Multivariable logistic regression analysis was used to explore the risk factors for HC, and the receiver operating characteristic curve was used to analyze the predictive efficacy of related factors for HC.@*RESULTS@#Among the 247 TM patients who underwent allo-HSCT, the incidence of HC was 36.8% (91/247). Univariate analysis showed age, incompatible blood types between donors and recipients, occurrence of acute graft-versus-host disease (aGVHD), positive urine BK virus deoxyribonucleic acid (BKV-DNA), and ≥2 viral infections were associated with the development of HC after allo-HSCT (P<0.05). Multivariable analysis revealed that incompatible blood types between donors and recipients (OR=3.171, 95%CI: 1.538-6.539), occurrence of aGVHD (OR=2.581, 95%CI: 1.125-5.918), and positive urine BKV-DNA (OR=21.878, 95%CI: 9.633-49.687) were independent risk factors for HC in children with TM who underwent allo-HSCT. The receiver operating characteristic curve analysis showed that positive urine BKV-DNA alone or in combination with two other risk factors (occurrence of aGVHD, incompatible blood types between donors and recipients) had a certain accuracy in predicting the development of HC after allo-HSCT (area under the curve >0.8, P<0.05).@*CONCLUSIONS@#Incompatible blood types between donors and recipients, occurrence of aGVHD, and positive urine BKV-DNA are risk factors for HC after allo-HSCT in children with TM. Regular monitoring of urine BKV-DNA has a positive significance for early diagnosis and treatment of HC.

Prognostic Factors Analysis of Children with Hemophagocytic Lymphohistiocytosis / 中国实验血液学杂志

OBJECTIVE@#To analyze the risk factors affecting prognosis of children with hemophagocytic lymphohistiocytosis (HLH).@*METHODS@#The clinical manifestations and laboratory data of 143 HLH children who met the HLH-2004 diagnostic criteria in Shenzhen Children's Hospital from January 2009 to May 2017 were retrospectively analyzed, and the independent factors affecting prognosis were also analyzed.@*RESULTS@#The median age of 143 HLH children was 1.9 (0.1-14.3) years old, and the median follow-up time was 6.7 years (1 day - 11.9 years). The overall survival rate of 1 month, 1 year, and 10 years was (87.4±5.5)%, (81.1±6.5)%, and (81.1±6.5)%, respectively. The deaths occurred within 1 year after onset. Multivariate analysis showed that central nervous system (CNS) involvement (P=0.047), low hemoglobin (P=0.002), prolonged activated partial thromboplastin time (APTT) (P<0.001), high triglyceride (P=0.005) were all the independent risk factors affecting survival of the children. Receiver operating characteristic curve indicated that APTT (AUC=0.753, P<0.001) was more valuable than other risk factors in predicting death of the children. The cut-off value of APTT was 56.6 s, and the sensitivity and specificity of which was 55.6% and 89.7%, respectively.@*CONCLUSION@#Hypohemoglobinemia, prolonged APTT, hypertriglyceridemia, and CNS involvement the risk factors affecting prognosis of HLH, and prolonged APTT shows a strong predictive value for death.

Application Value of Capillary Electrophoresis in Screeningβ-Thalassemia of Children / 中国实验血液学杂志

OBJECTIVE@#to explore the value of capillary electrophoresis in screening β- thalassemia of children, and to establish the cutoff values of HbA2 and HbF in our laboratory.@*METHODS@#The data of hemoglobin capillary electrophoresis and genetic diagnosis of β- thalassemia from 886 examined children were retrospectively analyzed. The cutoff values of HbA2 and HbF were determined by ROC curve.@*RESULTS@#The cutoff value of HbA2 screening minor β- thalassemia was 3.65%, the specificity was 0.996, and the sensitivity was 0.995. The cut-off value of HbF for screening minor β- thalassemia was 1.45%, specificity was 0.751 and sensitivity was 0.675. Thus, 1 case with codon5 (CCT→C) mutation, 1 case with SEA -HPFH β deletion, 1 case with - 28 (A→G) merger IVS-Ι-128 (T→G) double heterozygous mutations yet were found out, 1 case with 47 bp β gene missing has not yet been reported in literature.@*CONCLUSION@#Capillary electrophoresis has more high sensitivity and specificity in the screening of β- thalassemia in children, especially for the detection of rare β- thalassemia.

Genotypic and Phenotypic Analysis of αβ-Thalassemia in Children / 中国实验血液学杂志

OBJECTIVE@#To analyze the genotype and hematological characteristics of children with αβ-thalassemia in Shenzhen area of China.@*METHODS@#The erythrocyte parameters and hemoglobin components of the children were determined by blood routine examination and capillary electrophoresis (CE). Reverse dot blot (RDB) -polymerase chain reaction (PCR) was used to determine gene mutations in α- and β-thalassemia children. The Gap-PCR was used to determine the gene deletion of α-thalassemia children，while specimens suspected HKαα were determined with nested PCR.@*RESULTS@#Total of 29 complex genotypes were detected from 74 cases of αβ-thalassemia, among which 1 case was determined as β-thalassemia with αααanti4.2/αα and 5 cases were double heterozygous β-thalassemia combining α-thalassemia with intermediate phenotype. 1 case of β-28/βcap+40-43 double heterozygotes combined with --/αα and the other 62 cases were characterized by light β-thalassemia, 2 cases ofβCAP+40-43/βN with --/αα showed light α-thalassemia.@*CONCLUSION@#The genotypes of αβ-thalassemia in Shenzhen area of China are complex and diverse. The common complex genotypes are similar to those of simple β-thalassemia. If the genotype and phenotype are not consistent, the existence of rare genotype should be considered.

Serum level of soluble transferrin receptor in children with hemoglobin H disease / 中国当代儿科杂志

OBJECTIVE@#To investigate the serum level of soluble transferrin receptor (sTfR) and its association with the degree of anemia in children with hemoglobin H (HbH) disease.@*METHODS@#A total of 55 children with HbH disease were enrolled as the HbH group, and 30 healthy children were enrolled as the control group. The HbH group was further divided into a deletional HbH disease group and a non-deletional HbH disease group. A retrospective analysis was performed for hematological parameters and serum sTfR level in all groups.@*RESULTS@#Of the 55 children with HbH disease, 39 had deletional HbH disease and 16 had non-deletional HbH disease. Compared with the control group, the deletional and non-deletional HbH disease groups had significantly lower hemoglobin (Hb), mean corpuscular volume (MCV), and mean corpuscular hemoglobin (MCH) and a significantly higher serum level of sTfR. Compared with the deletional HbH disease group, the non-deletional HbH disease group had significantly lower red blood cell count (RBC) and Hb level and significantly higher MCV, MCH, and serum sTfR level. In children with HbH disease, serum sTfR level was negatively correlated with RBC and Hb level (r=-0.739 and -0.667 respectively, P<0.05) and positively correlated with MCV and MCH (r=0.750 and 0.434 respectively, P<0.05).@*CONCLUSIONS@#Serum sTfR level is associated the degree of anemia in children with HbH disease, and sTfR may be a target for the treatment of HbH disease.

Gene promoter methylation in glucose-6-phosphate dehydrogenase deficiency / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To investigate the features of methylation in the promoter region of glucose-6-phosphate dehydrogenase (G6PD) gene and the association between gene promoter methylation and G6PD deficiency.</p><p><b>METHODS</b>Fluorescent quantitative PCR was used to measure the mRNA expression of G6PD in 130 children with G6PD deficiency. Sixty-five children without G6PD deficiency served as the control group. The methylation-sensitive high-resolution melting curve analysis and bisulfite PCR sequencing were used to analyze gene promoter methylation in 22 children with G6PD deficiency and low G6PD mRNA expression. The G6PD gene promoter methylation was analyzed in 44 girls with normal G6PD mRNA expression (7 from G6PD deficiency group and 37 from control group).</p><p><b>RESULTS</b>Twenty-two (16.9%) children with G6PD deficiency had relatively low mRNA expression of G6PD; among whom, 16 boys showed no methylation, and 6 girls showed partial methylation. Among the 44 girls with normal G6PD mRNA expression, 40 showed partial methylation, and 4 showed no methylation (1 case in the G6PD group and 3 cases in the control group).</p><p><b>CONCLUSIONS</b>Gene promoter methylation is not associated with G6PD deficiency in boys. Girls have partial methylation or no methylation in the G6PD gene, suggesting that the methylation may be related to G6PD deficiency in girls.</p>

Detection of gene mutation in glucose-6-phosphate dehydrogenase deficiency by RT-PCR sequencing / 中国当代儿科杂志

<p><b>OBJECTIVE</b>Since glucose-6-phosphate dehydrogenase (G6PD) deficiency is the most common hereditary hemolytic erythrocyte enzyme deficiency, most cases have single nucleotide mutations in the coding region, and current test methods for gene mutation have some missed detections, this study aimed to investigate the feasibility of RT-PCR sequencing in the detection of gene mutation in G6PD deficiency.</p><p><b>METHODS</b>According to the G6PD/6GPD ratio, 195 children with anemia of unknown cause or who underwent physical examination between August 2013 and July 2014 were classified into G6PD-deficiency group with 130 children (G6PD/6GPD ratio <1.00) and control group with 65 children (G6PD/6GPD ratio≥1.00). The primer design and PCR amplification conditions were optimized, and RT-PCR sequencing was used to analyze the complete coding sequence and verify the genomic DNA sequence in the two groups.</p><p><b>RESULTS</b>In the G6PD-deficiency group, the detection rate of gene mutation was 100% and 13 missense mutations were detected, including one new mutation. In the control group, no missense mutation was detected in 28 boys; 13 heterozygous missense mutations, 1 homozygous same-sense mutation (C1191T) which had not been reported in China and abroad, and 14 single nucleotide polymorphisms of C1311T were detected in 37 girls. The control group showed a high rate of missed detection of G6PD deficiency (carriers) in the specimens from girls (35%, 13/37).</p><p><b>CONCLUSIONS</b>RT-PCR sequencing has a high detection rate of G6PD gene mutation and a certain value in clinical diagnosis of G6PD deficiency.</p>

Genetic factors in the occurrence of neonatal unconjugated hyperbilirubinemia / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To study association of uridine-diphosphate-glucuronosyltransferase1A1 (UGT1A1) Gly71Arg, UGT1A1 promoter TATA-box and glucose-6-phosphate dehydrogenase (G6PD) gene mutations with the occurrence of neonatal unconjugated hyperbilirubinemia.</p><p><b>METHODS</b>The TATA-box, exon 1 and exon 5 of the UGT1A1 gene and the exon 12 of G6PD gene were amplified by PCR. The products of PCR were analyzed by direct DNA sequencing. Clones for the mutations of the UGT1A1 gene and the G6PD gene were constructed in order to identify the results of the products of PCR. Seventy-two neonates with unconjugated hyperbilirubinemia (case group) and 65 healthy neonates (control group) were enrolled. The genotypes and allele frequencies of the polymorphisms of UGT1A1 Gly71Arg and UGT1A1 TATA-box were compared between the two groups. The effects of UGT1A1 Gly71Arg, UGT1A1 promoter TATA-box and G6PD gene mutations on the development of neonatal unconjugated hyperbilirubinemia were estimated using logistic regression models.</p><p><b>RESULTS</b>There were significant differences in the genotype distribution of Gly71Arg polymorphism of UGT1A1 gene between the case and control groups (P<0.01). The Arg allele frequency of the polymorphisms of UGT1A1 gene in the case group was significantly higher than in the control group (P<0.01). There were no significant differences in the genotype distribution of the UGT1A1 promoter TATA-box between the two groups (P>0.05). The OR and 95%CI values of UGT1A1 Gly71Arg, UGT1A1 TATA-box and G6PD gene mutations associated with the development of neonatal unconjugated hyperbilirubinemia were 5.468 (2.274, 12.818), 0.688 (0.266, 1.778) and 5.081 (1.070, 24.133) respectively.</p><p><b>CONCLUSIONS</b>UGT1A1 Gly71Arg and G6PD gene mutations may be involved in the development of neonatal unconjugated hyperbilirubinemia.</p>

Status of iron metabolism and erythropoietic proliferation in children with various genotypes of thalassemia / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To study the status of iron metabolism and erythropoietic proliferation in children with various genotypes of thalassemia.</p><p><b>METHODS</b>Serum concentrations of ferritin (SF), transferrin receptor (sTfR) and erythropoietin (EPO) were measured in 158 children with thalassemia. The differences in the concentrations of the three indices among children with different genotypes of thalassemia were compared. The correlations of the hemoglobin level with sereum SF, sTfR and EPO levels were assessed.</p><p><b>RESULTS</b>Among the 158 children with thalassemia, 52(32.9%) were diagnosed with alpha-thalassemia minor, 27(17.1%) with HbH disease, 59(37.4%) with beta-thalassemia minor, 13(8.2%) with beta-thalassemia major, and 7(4.4%) with combining alpha beta thalassemia. The SF levels in children with HbH disease or beta-thalassemia major were significantly higher than those in the other thalassemia groups (P<0.01). The sTfR levels in children with beta-thalassemia major were the highest when compared with those in the other thalassemia groups (P<0.05). The EPO levels in children with beta-thalassemia major were also the highest when compared with those in the other thalassemia groups (P<0.01). There was a negative correlation between hemoglobin and EPO levels in children with HbH disease (r=-0.656, P<0.01) and beta-thalassemia major (r=-0.641; P<0.05).</p><p><b>CONCLUSIONS</b>The status of iron metabolism and erythropoietic proliferation is different in children with different genotypes of thalassemia. A combined measurement of SF, sTfR and EPO may reflect the status of erythropoietic proliferation.</p>

Genetic diagnosis for female carriers of glucose-6-phosphate dehydrogenase deficiency by RT-PCR-DGGE / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To study the feasibility of genetic diagnosis for female carriers of human glucose-6-phosphate dehydrogenase (G6PD) deficiency by reverse transcriptase-PCR-denaturing gradient gel electrophoresis (RT-PCR-DGGE).</p><p><b>METHODS</b>Blood samples were collected from suspected 54 female carriers of G6PD deficiency. Total RNAs of peripheral blood were prepared and reverse-transcripted into cDNA. Design of 6 primer pairs for DGGE was based on 17 mutation sites of G6PD cDNA described in the Chinese population. Mutations in the coding region of G6PD gene were screened and genotyped by combination of PCR-DGGE and DNA sequencing.</p><p><b>RESULTS</b>One case of 1024C/T, 20 cases of 1376G/T and 12 cases of 1388G/A were detected in the 54 samples. The total detection rate was 66.1% (33/54).</p><p><b>CONCLUSIONS</b>Heterozygous mutation rate in female carriers of G6PD deficiency detected by RT-PCR-DGGE is high. RT-PCR-DGGE is value of clinical diagnosis for G6PD-deficiency female carriers.</p>

Application of PCR-DGGE technique in G-6-PD deficiency / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To detect gene mutations of children with glucose-6-phosphorate dehydrogenase (G-6-PD) deficiency and of carriers of G-6-PD deficiency gene with the technique of polymerase chain reaction and denatured gradient gel electrophoresis (PCR-DGGE), and to explore the value of the technique in the diagnosis of G-6-PD deficiency and G-6-PD deficiency gene carrying.</p><p><b>METHODS</b>cDNAs were harvested by reverse transcription method after RNAs had been extracted from peripheral blood of 43 children with G-6-PD deficiency and of their family members (36 lineages). Electrophoresis behaviors of the fragment from exons 11-12 of G-6-PD cDNA were detected with the technique of PCR-DGGE. Gene sequencing was then performed for the abnormal electrophoresis bands.</p><p><b>RESULTS</b>Abnormal electrophoresis bands were found in the 1304-1520 fragment of G-6-PD cDNA in 33 out of 36 family lineages. The G-6-PD/6-PGD ratio was below 1.00 in 9 mothers of patients. Three of them had the G-6-PD/6-PGD ratio lower than 0.50. The PCR-DGGE bands were the same in the 3 mothers. Gene sequencing showed double heterozygote in the 3 mothers, but the maternal carriers of G-6-PD deficiency gene who had normal G-6-PD/6-PGD ratio showed mono-heterozygote in gene sequencing. Three mutational sites were found in the 1304-1520 fragment, i.e., C1311TG1376T and G1388A. The electrophoresis behaviors were different among the 3 gene mutational sites.</p><p><b>CONCLUSIONS</b>PCR-DGGE is a sensitive and reliable technique in the screening of gene mutations. It is useful in the diagnosis of G-6-PD deficiency, especially in the diagnosis of female G-6-PD deficiency gene carrying.</p>

Expression of G-6-PD mRNA in children with G-6-PD deficiency / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To detect the level of glucose-6-phosphate dehydrogenase (G-6-PD) mRNA expression in children with G-6-PD deficiency and their lineal family members in order to explore possible mechanisms of the disease at the transcriptional level.</p><p><b>METHODS</b>RNA was extracted from peripheral blood of 41 children with G-6-PD deficiency and of their lineal family members (29 father lineages and 40 mother lineages). cDNA was then harvested using the reverse transcription method. G-6-PD mRNA expression was detected by quantitative real-time PCR (QRT-PCR). The detection results of G-6-PD mRNA expression in three groups (Patient, Father lineage and Mother lineage) were compared using Statistical Software SPSS 10.0 system.</p><p><b>RESULTS</b>The mean G-6-PD mRNA value in the Patient, Father lineage and Mother lineage groups were 0.57 +/- 0.19, 0.74 +/- 0.21 and 0.67 +/- 0.21 respectively. The G-6-PD mRNA value in the Patient group was significantly lower than both Father lineage (t = -3.18, P < 0.01) and Mother lineage groups (t = -2.54, P < 0.05).</p><p><b>CONCLUSIONS</b>The expression of G-6-PD mRNA decreased in children with G-6-PD deficiency, suggesting that the pathogenesis of this disorder relates to the varying levels of gene transcription.</p>