RESUMEN
HLA-B*15:18:01:04 differs from HLA-B*15:18:01:02 by single nucleotide substitution at position 2176 (G > A).
RESUMEN
B*40:302 differs from B*40:02:01:01 by a single nonsynonymous nucleotide substitution at codon 81 (CCGâCTG).
Asunto(s)
Alelos , Exones , Antígeno HLA-B40/genética , Polimorfismo de Nucleótido Simple , Sustitución de Aminoácidos , Pueblo Asiatico , Secuencia de Bases , Codón/química , Expresión Génica , Genotipo , Antígeno HLA-B40/inmunología , Prueba de Histocompatibilidad , Humanos , Reacción en Cadena de la Polimerasa , Alineación de Secuencia , Análisis de Secuencia de ADNRESUMEN
B*58:01:21 has a single nucleotide change, c.264A>G (ACAâACG at codon 88) compared with B*58:01:01:01.
Asunto(s)
Alelos , Exones , Antígeno HLA-A11/genética , Polimorfismo de Nucleótido Simple , Pueblo Asiatico , Secuencia de Bases , Codón/química , Expresión Génica , Genotipo , Antígeno HLA-A11/inmunología , Antígenos HLA-B , Trasplante de Células Madre Hematopoyéticas , Prueba de Histocompatibilidad , Humanos , Reacción en Cadena de la Polimerasa , Alineación de Secuencia , Análisis de Secuencia de ADN , Donantes de TejidosRESUMEN
The new allele DPB1*518:01 showed one nucleotide difference with DPB1*13:01:01 at codon 124 (CCT/ACT).
Asunto(s)
Alelos , Pueblo Asiatico/genética , Cadenas beta de HLA-DP/genética , Prueba de Histocompatibilidad/métodos , Secuencia de Bases , Exones/genética , HumanosRESUMEN
The new allele DPB1*519:01 showed one nucleotide difference with DPB1*13:01:01 at codon 234 (GTG/ATG).
Asunto(s)
Alelos , Pueblo Asiatico/genética , Cadenas beta de HLA-DP/genética , Prueba de Histocompatibilidad/métodos , Secuencia de Bases , Exones/genética , HumanosRESUMEN
One nucleotide insertion between residues 1804 and 1805 of HLA-A*24:02:01:01 results in a new allele, HLA-A*24:02:01:09.
Asunto(s)
Alelos , Pueblo Asiatico/genética , Antígeno HLA-A24/genética , Prueba de Histocompatibilidad/métodos , Secuencia de Bases , Exones/genética , Humanos , Intrones/genética , Polimorfismo de Nucleótido Simple/genética , República de CoreaRESUMEN
BACKGROUND: Cis-AB, a rare ABO variant, is the result of a mutated ABO gene that produces a glycosyltransferase enzyme with dual A and B glycosyltransferase activity. It may lead to ABO discrepancies and a delay in establishing the blood group. To date, there have been no reports of a de novo mutation leading to a cis-AB allele. OBJECTIVES AND METHODS: Sequencing of the ABO gene using blood and hair follicle cells from the proposita were performed along with blood from her parents. To establish maternity and paternity, short tandem repeat (STR) analysis was also performed. The A and B enzyme activities of the novel enzyme were measured in an in vitro expression study. RESULTS: A novel cis-AB allele arising from nucleotide substitution c.796A>G (p.M266V) in the B glycosyltransferase gene were discovered in the blood and hair follicle cells from the proposita, which was absent from her parents. In all 15 autosomal STR loci analysed, the probability of maternity and paternity were 0.999999 and 0.999989, respectively. The novel enzyme created 33.1% and 60.2% of A and B antigen compared to wild type A and B glycosyltransferases. CONCLUSION: A novel mechanism leading to a cis-AB allele was discovered.
Asunto(s)
Sistema del Grupo Sanguíneo ABO/genética , Glicosiltransferasas/genética , Mutación , Adulto , Alelos , Femenino , HumanosRESUMEN
INTRODUCTION: Unreported parameters produced by automated blood cell counter, particularly large unstained cells (LUC) and delta neutrophil index (DNI), indicated the presence of immature and possibly abnormal cell populations in white blood cell population. The purpose of this study was to investigate the laboratory performance for discrimination of acute promyelocytic leukemia (APL) cells from other types of leukemia cells and clinical value of LUC and DNI parameters in bone marrow (BM) samples of patients with acute leukemia. METHODS: A total of 73 BM samples of patients with various type of acute leukemia were analyzed. LUC and DNI parameters were determined by an automated hematology analyzer (ADVIA 120; Siemens Healthcare Diagnostics, New York, NY, USA). Statistical analysis was performed using Kruskal-Wallis and Mann-Whitney U methods. Receiver operating characteristic curve (ROC) analysis, survival analysis, and Cox proportional hazard model were used to evaluate the clinical implication. RESULTS: There were significant differences (P < 0.05) between APL group and other group in the DNI and LUC values except for DNI between APL group and non-APL myeloid leukemia group. The area under curve of LUC was larger than that of DNI from the ROC analysis for discrimination between APL group and other group. High LUC value was associated with the increased risk of adverse outcomes and the worse overall survival in patients with acute leukemia. CONCLUSION: Delta neutrophil index and LUC in BM showed discriminating power of APL cells from other leukemia cells.
Asunto(s)
Médula Ósea/patología , Leucemia Mieloide Aguda/diagnóstico , Leucemia Promielocítica Aguda/diagnóstico , Neutrófilos/patología , Leucemia-Linfoma Linfoblástico de Células Precursoras/diagnóstico , Adolescente , Adulto , Área Bajo la Curva , Automatización de Laboratorios , Estudios de Casos y Controles , Niño , Cromosomas Humanos Par 15 , Cromosomas Humanos Par 17 , Diagnóstico Diferencial , Femenino , Humanos , Leucemia Mieloide Aguda/clasificación , Leucemia Mieloide Aguda/mortalidad , Leucemia Mieloide Aguda/patología , Leucemia Promielocítica Aguda/genética , Leucemia Promielocítica Aguda/mortalidad , Leucemia Promielocítica Aguda/patología , Masculino , Persona de Mediana Edad , Leucemia-Linfoma Linfoblástico de Células Precursoras/genética , Leucemia-Linfoma Linfoblástico de Células Precursoras/mortalidad , Leucemia-Linfoma Linfoblástico de Células Precursoras/patología , Modelos de Riesgos Proporcionales , Curva ROC , Análisis de Supervivencia , Translocación GenéticaRESUMEN
The C*06:99 allele substitutes one nucleotide of C*06:02:01:01 at codon 50 (CCGâCTG), Pro to Leu.
Asunto(s)
Antígenos HLA-C/genética , Prueba de Histocompatibilidad , Secuencia de Bases , Exones/genética , Frecuencia de los Genes , Genotipo , Trasplante de Células Madre Hematopoyéticas , Humanos , Corea (Geográfico) , Datos de Secuencia Molecular , Reacción en Cadena de la Polimerasa , Alineación de Secuencia , Donantes de TejidosRESUMEN
The C*07:244 changes single nucleotide of C*07:02:01 at codon 75 (CGA â CAA), Arg to Gln.
Asunto(s)
Alelos , Antígenos HLA-C/genética , Nucleótidos/genética , Sustitución de Aminoácidos , Pueblo Asiatico , Secuencia de Bases , Codón , Exones , Sitios Genéticos , Antígenos HLA-C/inmunología , Prueba de Histocompatibilidad , Humanos , Datos de Secuencia Molecular , Análisis de Secuencia de ADN , Homología de Secuencia de Ácido NucleicoRESUMEN
The new allele A*02:07:02 shows a single nucleotide substitution compared with A*02:07:01 at codon 233 (ACC â ACT) without any amino acid change.
Asunto(s)
Alelos , Pueblo Asiatico , Antígeno HLA-A2/genética , Secuencia de Bases , Codón , Dermatoglifia del ADN , Exones , Frecuencia de los Genes , Antígeno HLA-A2/inmunología , Humanos , Datos de Secuencia Molecular , Polimorfismo de Nucleótido Simple , República de Corea , Alineación de Secuencia , Análisis de Secuencia de ADNRESUMEN
INTRODUCTION: Neonates with Down syndrome (DS) are predisposed to developing transient abnormal myelopoiesis (TAM) and acute myeloid leukemia (AML) associated with DS. However, there is a paucity of data on hematological aberrations and GATA1 mutations in neonates with DS in East Asian populations. METHODS: Total 109 patients with DS who had one or more CBCs obtained were enrolled. The molecular analysis of the GATA1 gene performed in 10 patients (three TAM, three AML associated with DS at diagnosis, one remission case of AML associated with DS and three DS without TAM or AML). RESULTS: East Asian DS neonates showed low frequency of thrombocytopenia, uncommon neutrophilia and higher prevalence rate of TAM compared to previous reports from western countries. GATA1 mutations were identified in almost all TAM and AML associated with DS samples, but were not detected in the samples from DS without TAM or AML associated with DS. CONCLUSION: East Asian DS neonates and children showed distinctive spectrum of hematological abnormalities.
Asunto(s)
Síndrome de Down/complicaciones , Enfermedades Hematológicas/epidemiología , Preescolar , Asia Oriental/epidemiología , Factor de Transcripción GATA1/genética , Enfermedades Hematológicas/etiología , Humanos , Lactante , Recién Nacido , Leucemia Mieloide Aguda , Mutación , MielopoyesisRESUMEN
South East Asia has some of the highest prevalence rates of hepatitis B virus (HBV) infection (>or=8%) in the world, and the emergence of hepatitis B surface antigen (HBsAg) mutant strains is a growing problem. Assays with the highest levels of sensitivity, including mutant detection, should be used for routine HBsAg screening. In this large multicenter study, the clinical and technical performance of the fully automated Elecsys HBsAg II assay was compared with the Architect, AxSYM, and Advia Centaur HBsAg assays for HBsAg screening. Nine laboratories (three each from Thailand, Korea, and Singapore) compared the Elecsys HBsAg II assay with their routine HBsAg screening assay against a range of stored and routine clinical samples, including recombinant mutants. The Elecsys HBsAg II assay demonstrated equivalent sensitivity and specificity to the Architect HBsAg assay. However, the Elecsys HBsAg II assay recognized a native mutant sample (L94S, L97V, L98V, T123A) that the Architect HBsAg assay failed to detect. The AxSYM and Advia Centaur HBsAg assays appeared less sensitive for the detection of early HBV infection and also failed to detect some of the recombinant mutant strains. There was almost complete agreement between the Elecsys HBsAg II assay and comparator assays with respect to routine serum samples. The results of this study demonstrate that the Elecsys HBsAg II assay is a highly sensitive and specific screening assay for HBsAg and detects reliably the most important and clinically relevant HBV mutants and genotypes. It is suitable for routine HBsAg screening in Asia.
Asunto(s)
Técnicas de Laboratorio Clínico/métodos , Antígenos de Superficie de la Hepatitis B/sangre , Hepatitis B/diagnóstico , Tamizaje Masivo/métodos , Juego de Reactivos para Diagnóstico , Automatización , Humanos , Inmunoensayo/métodos , República de Corea , Sensibilidad y Especificidad , Singapur , TailandiaAsunto(s)
Fusarium/aislamiento & purificación , Leucemia Mieloide/complicaciones , Micosis/complicaciones , Infecciones Oportunistas/complicaciones , Enfermedad Aguda , Secuencia de Bases , Dermatomicosis/complicaciones , Resultado Fatal , Femenino , Humanos , Persona de Mediana Edad , ARN de Hongos/genética , ARN Ribosómico 28S/genéticaAsunto(s)
ADN Mitocondrial/genética , Marcadores Genéticos , Hematopoyesis/genética , Repeticiones de Minisatélite , Trasplante de Células Madre , Quimera por Trasplante , Trasplante Homólogo/fisiología , Animales , Linfocitos B/inmunología , Secuencia de Bases , Humanos , Sensibilidad y Especificidad , Linfocitos T/inmunologíaRESUMEN
We report a rare case of cutaneous abscess by Trichosporon asahii in an immunocompetent adult. A 31-year-old Korean woman presented to our hospital with a cutaneous abscess. She had received an intralesional steroid injection 4 months earlier on the site of a hypertrophic scar. Direct sequencing of the intergenic spacer regions of the rRNA genes identified T. asahii. The decreased local immunity after the steroid injection might have triggered the infection by T. asahii. A cutaneous abscess formation by T. asahii in an immunocompetent patient is an unusual cutaneous finding that to our knowledge has not been reported previously. The local immune reaction of the skin is important for the prevention of Trichosporon infection.
Asunto(s)
Absceso/microbiología , Dermatomicosis/microbiología , Inyecciones Intralesiones/efectos adversos , Trichosporon , Absceso/inmunología , Adulto , Dermatomicosis/inmunología , Femenino , HumanosRESUMEN
Discrepancies between blood group genotype and RBC phenotype are important to recognize when implementing DNA-based blood grouping techniques. This report describes two such cases involving the ABO blood group in the Korean population. Propositus #1 was a 22-year-old healthy man undergoing pretransfusion testing for minor surgery. Propositus #2 was a 23- year-old male blood donor. RBCs from both propositi were determined to be group AB and demonstrated unusual agglutination patterns on forward typing, which were inconsistent with their ABO genotype determined by allele-specific (AS) PCR. RBCs from propositus #1 demonstrated mixed field agglutination with both anti-A and -B, while RBCs from propositus #2 demonstrated mixed field only with anti-A reagents. Both had B/O genotypes by AS-PCR. Cloning and sequencing of ABO exons 6 and 7 revealed three alleles in both propositi: propositus #1: A102/B101/O04; propositus #2: A102/B101/O01. A panel of nine short-tandem repeat (STR) loci was tested on DNA extracted from blood, buccal mucosal cells, and hair from the propositi and on DNA isolated from their parents' blood. In all tissues tested from propositus #1, three loci demonstrated a double paternal and a single maternal DNA contribution, indicating that he was a chimera or a mosaic; in those from propositus # 2, one STR locus demonstrated a double paternal DNA contribution, indicating that he was a tetragametic chimera. Chimerism and mosaicism are uncommon but important causes of ABO genotype and phenotype discrepancies. The evaluation of patients and donors with unusual or unexpected serology in pretransfusion testing and consensus ABO alleles may include the evaluation of STR loci to detect these phenomena.
Asunto(s)
Sistema del Grupo Sanguíneo ABO/genética , Quimerismo , Mosaicismo , Sistema del Grupo Sanguíneo ABO/inmunología , Adulto , Tipificación y Pruebas Cruzadas Sanguíneas , Genotipo , Humanos , Masculino , Linaje , Valores de ReferenciaRESUMEN
A serological and genetic study of Korean blood donors with phenotypic group A subtypes was performed. There were 176 donors with phenotypic A subtypes identified. Exons 6 and 7 from 57 representative donors were sequenced. The A(var) allele (784 G > A) was cloned and sequenced, and a family study demonstrating its inheritance and unusual serological characteristics was performed. The A102 allele was the most frequently identified allele in phenotypically A2 (58%, 11/19) and A2B (68%, 17/25) donors. Anti-A1 was rarely present amongst A2 and A2B donors. The family study revealed that the A(var) allele was expressed as phenotype A(weak)B in A(var)/B heterozygote members, but as phenotype O in A(var)/O heterozygotes. The most frequent allele in Korean donors with the A2 phenotype differs from its Caucasian counterpart, as does the frequency of anti-A1. The A(var) allele demonstrates allelic enhancement in A(var)/B heterozygotes.
Asunto(s)
Sistema del Grupo Sanguíneo ABO/genética , Patrón de Herencia , Alelos , Donantes de Sangre , Frecuencia de los Genes , Genotipo , Humanos , Corea (Geográfico) , Linaje , Fenotipo , Análisis de Secuencia de ADNRESUMEN
BACKGROUND AND OBJECTIVES: The cis-AB blood group is rare, although relatively common amongst Koreans. The serological characteristics and genetic basis of Korean cis-AB blood donors were investigated. MATERIALS AND METHODS: Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP), designed to detect the cis-AB01 allele, was performed on 194 AB samples which demonstrated weak or unusual expression of either or both of the A or B antigens. RESULTS AND CONCLUSIONS: Sixty cis-AB01 donors were identified. cis-AB01/O01 or O02 were the most common genotypes (36/60) detected only in A(2)B(3) donors, and cis-AB01/B101 (nine of 60) was the least common genotype identified only in A(2)B donors. Surprisingly cis-AB01/A102 (15/60) was identified in a variety of phenotypes (A(1)B(3), A(1)B(x) or el, A(int)B(3)).
Asunto(s)
Sistema del Grupo Sanguíneo ABO/genética , Sistema del Grupo Sanguíneo ABO/análisis , Sistema del Grupo Sanguíneo ABO/inmunología , Alelos , Donantes de Sangre , Galactosiltransferasas , Frecuencia de los Genes , Genotipo , Humanos , Corea (Geográfico) , N-Acetilgalactosaminiltransferasas , Reacción en Cadena de la Polimerasa , Polimorfismo de Longitud del Fragmento de RestricciónRESUMEN
Primary V. vulnificus septicemia has been continuously reported in Korea. We analyzed the molecular diversity of V. vulnificus strains isolated from clinical specimens using pulsed-field gel electrophoresis (PFGE) and random amplified polymorphic DNA (RAPD) analysis. We analyzed a total of 23 V. vulnificus strains isolated from 22 patients between 1992 and 1997. RAPD analysis was performed using five random primers, and we obtained chromosomal DNA restriction patterns with NotI and SfiI by PFGE. Two isolates from one patient disclosed similarity value 1.0 by RAPD and had an indistinguishable pattern when analyzed with PFGE, which indicated that they were the same strains. The remaining 22 isolates from 22 patients could be separated into 5 different molecular types in RAPD analysis. The range of similarity values among the isolates was wide (0.29-0.81). Of 22 strains, four strains could not be typed in repeated trials by PFGE with NotI and SfiI. The PFGE patterns of 18 strains showed a remarkable polymorphism consisting 12-19 fragments (20-870 kb). These results show that V. vulnificus strains isolated from Korea are genetically diversified for the most part.