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1.
HLA ; 90(5): 300-301, 2017 11.
Artículo en Inglés | MEDLINE | ID: mdl-28786538

RESUMEN

HLA-A*02:653 differs from A*02:01:01:01 by a C to T substitution in exon 2.


Asunto(s)
Alelos , Antígenos HLA-A/genética , Secuencia de Bases , Exones/genética , Femenino , Humanos , Italia
2.
HLA ; 90(2): 109-110, 2017 08.
Artículo en Inglés | MEDLINE | ID: mdl-28382774

RESUMEN

The novel allele HLA-A*03:275N differs from HLA-A*03:01:01:01 by 1 nucleotide substitutions in exon 2.


Asunto(s)
Exones , Antígeno HLA-A3/genética , Mutación Missense , Humanos
3.
HLA ; 90(2): 130-131, 2017 08.
Artículo en Inglés | MEDLINE | ID: mdl-28345312

RESUMEN

The novel allele DQA1*01:15N differs from DQA1*01:03:01:01 by 1 nucleotide substitutions in exon 2.


Asunto(s)
Alelos , Antígenos HLA-DQ/genética , Humanos , Italia
6.
Tissue Antigens ; 86(4): 285-92, 2015 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-26300115

RESUMEN

The simultaneous typing of five-HLA loci at high resolution and the availability of pedigree data allowed us to characterize extended five-locus phased haplotypes in 124 Nigerian families and to compare the observed frequencies with those expected by an expectation-maximization algorithm for unphased data. Despite the occurrence of some frequent alleles at each locus (e.g. B*53:01, which is assumed to protect against Plasmodium falciparum), as many as 82% of the sampled individuals carry two unique five-locus haplotypes and only three extended haplotypes with frequency above 1% exhibit significant linkage disequilibrium. Although preliminary, these results reveal an extreme level of HLA diversity in the Nigerian population, which reflects both its multi-ethnic composition and the very ancient demographic history of African populations.


Asunto(s)
Antígenos HLA-A/genética , Antígenos HLA-B/genética , Antígenos HLA-C/genética , Cadenas beta de HLA-DQ/genética , Cadenas HLA-DRB1/genética , Haplotipos , Desequilibrio de Ligamiento , Alelos , Familia , Expresión Génica , Frecuencia de los Genes , Variación Genética , Genética de Población , Antígenos HLA-A/inmunología , Antígenos HLA-B/inmunología , Antígenos HLA-C/inmunología , Cadenas beta de HLA-DQ/inmunología , Cadenas HLA-DRB1/inmunología , Prueba de Histocompatibilidad , Humanos , Nigeria , Linaje
8.
Tissue Antigens ; 84(2): 198-205, 2014 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-24749647

RESUMEN

The information regarding the probability of finding a matched unrelated donor (MUD) within a relatively short time is crucial for the success of hematopoietic stem cell transplantation (HSCT), particularly in patients with malignancies. In this study, we retrospectively analyzed 315 Italian patients who started a search for a MUD, in order to assess the distribution of human leukocyte antigen (HLA) alleles and haplotypes in this population of patients and to evaluate the probability of finding a donor. Comparing two groups of patients based on whether or not a 10/10 HLA-matched donor was available, we found that patients who had a fully-matched MUD possessed at least one frequent haplotype more often than the others (45.6% vs 14.3%; P = 0.000003). In addition, analysis of data pertaining to the HLA class I alleles distribution showed that, in the first group of patients, less common alleles were under-represented (20.2% vs 40.0%; P = 0.006). Therefore, the presence of less frequent alleles represents a negative factor for the search for a potential compatible donor being successful, whereas the presence of one frequent haplotype represents a positive predictive factor. Antigenic differences between patient and donor observed at C and DQB1 loci, were mostly represented by particular B/C or DRB1/DQB1 allelic associations. Thus, having a particular B or DRB1 allele, linked to multiple C or DQB1 alleles, respectively, might be considered to be associated with a lower probability of a successful search. Taken together, these data may help determine in advance the probability of finding a suitable unrelated donor for an Italian patient.


Asunto(s)
Selección de Donante , Antígenos HLA/genética , Trasplante de Células Madre Hematopoyéticas , Donantes de Tejidos , Alelos , Frecuencia de los Genes/genética , Sitios Genéticos/genética , Haplotipos/genética , Humanos , Italia , Donante no Emparentado
12.
Tissue Antigens ; 80(6): 539-40, 2012 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-23016955

RESUMEN

HLA-A*03:143 has one nucleotide change from A*03:01: 01:01 at nt 406 from G to C, resulting in an amino acid change at codon 112 of exon 3 from Gly to Arg.


Asunto(s)
Antígeno HLA-A3/genética , Alelos , Sustitución de Aminoácidos , Secuencia de Bases , ADN/genética , Exones , Femenino , Técnicas de Genotipaje , Haplotipos , Prueba de Histocompatibilidad , Humanos , Italia , Masculino , Datos de Secuencia Molecular , Linaje , Polimorfismo de Nucleótido Simple , Homología de Secuencia de Ácido Nucleico
14.
Tissue Antigens ; 78(4): 286-7, 2011 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-21623737

RESUMEN

Human leukocyte antigen (HLA) class I sequence-based typing (SBT) for hematopoietic unrelated donor searching in an Italian Caucasian patient showed the presence of a novel HLA-A allele defined as A*31:48. HLA-A*31:48 has one nucleotide change from A*31:01:02 at nt 727 from C to T, resulting in an amino acid change at codon 219 of exon 4 from Arg to Trp.


Asunto(s)
Alelos , Sustitución de Aminoácidos , Antígenos HLA-A/genética , Mutación Missense , Adulto , Anemia Aplásica/genética , Anemia Aplásica/terapia , Femenino , Humanos
16.
Tissue Antigens ; 63(3): 282-3, 2004 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-14989721

RESUMEN

We report here the identification of a novel DRB1*11 allele, DRB1*1144, identified during sequence-based HLA-DRB1 typing. Molecular cloning and direct sequencing confirmed that the new allele is identical to DRB1*110401 at exon 2, except for a single nucleotide substitution (GTG-->GCG) changing codon 38 from Valine to Alanine.


Asunto(s)
Alelos , Antígenos HLA-DR/genética , Sustitución de Aminoácidos/genética , Secuencia de Bases , Clonación de Organismos , Cadenas HLA-DRB1 , Humanos , Datos de Secuencia Molecular , Polimorfismo de Nucleótido Simple , Alineación de Secuencia
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