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1.
HLA ; 90(5): 300-301, 2017 11.
Artigo em Inglês | MEDLINE | ID: mdl-28786538

RESUMO

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


Assuntos
Alelos , Antígenos HLA-A/genética , Sequência de Bases , Éxons/genética , Feminino , Humanos , Itália
2.
HLA ; 90(2): 109-110, 2017 08.
Artigo em Inglês | MEDLINE | ID: mdl-28382774

RESUMO

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


Assuntos
Éxons , Antígeno HLA-A3/genética , Mutação de Sentido Incorreto , Humanos
3.
HLA ; 90(2): 130-131, 2017 08.
Artigo em Inglês | MEDLINE | ID: mdl-28345312

RESUMO

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


Assuntos
Alelos , Antígenos HLA-DQ/genética , Humanos , Itália
7.
Tissue Antigens ; 86(4): 285-92, 2015 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-26300115

RESUMO

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.


Assuntos
Antígenos HLA-A/genética , Antígenos HLA-B/genética , Antígenos HLA-C/genética , Cadeias beta de HLA-DQ/genética , Cadeias HLA-DRB1/genética , Haplótipos , Desequilíbrio de Ligação , Alelos , Família , Expressão Gênica , Frequência do Gene , Variação Genética , Genética Populacional , Antígenos HLA-A/imunologia , Antígenos HLA-B/imunologia , Antígenos HLA-C/imunologia , Cadeias beta de HLA-DQ/imunologia , Cadeias HLA-DRB1/imunologia , Teste de Histocompatibilidade , Humanos , Nigéria , Linhagem
8.
Tissue Antigens ; 84(2): 198-205, 2014 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-24749647

RESUMO

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.


Assuntos
Seleção do Doador , Antígenos HLA/genética , Transplante de Células-Tronco Hematopoéticas , Doadores de Tecidos , Alelos , Frequência do Gene/genética , Loci Gênicos/genética , Haplótipos/genética , Humanos , Itália , Doadores não Relacionados
14.
Tissue Antigens ; 78(4): 286-7, 2011 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-21623737

RESUMO

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.


Assuntos
Alelos , Substituição de Aminoácidos , Antígenos HLA-A/genética , Mutação de Sentido Incorreto , Adulto , Anemia Aplástica/genética , Anemia Aplástica/terapia , Feminino , Humanos
16.
Tissue Antigens ; 63(3): 282-3, 2004 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-14989721

RESUMO

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.


Assuntos
Alelos , Antígenos HLA-DR/genética , Substituição de Aminoácidos/genética , Sequência de Bases , Clonagem de Organismos , Cadeias HLA-DRB1 , Humanos , Dados de Sequência Molecular , Polimorfismo de Nucleotídeo Único , Alinhamento de Sequência
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