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1.
PLoS One ; 12(4): e0176241, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28448587

RESUMO

The breadth of diagnostic procedures that utilize cell free DNA (cfDNA) from human plasma has increased dramatically in recent years. Here, we confirm that tumor-derived cfDNA fragments are similar in size distribution to cfDNA derived from normal tissues. Therefore, collection procedures optimized with healthy donor specimens are likely to be applicable to the diagnosis and monitoring of many different cancer types. We verify that the distribution and DNA sequences of fragmentation sites in cfDNA from both normal-germline and tumor-derived cfDNA are non-random. A broad survey of cfDNA from healthy donors suggests that average individuals possess ~6 ng of cfDNA per mL of plasma. Importantly, the cfDNA present in plasma samples that were initially collected as whole blood in K2-EDTA tubes and subsequently processed by centrifugation is stable for several days at ambient temperatures. This observation has the potential to significantly reduce the cost and logistical complexity of shipping clinical samples from the site of collection to centers proficient in diagnostic analysis. Finally, plasma samples collected with high-volume plasma collection devices possess abundant quantities of cfDNA. Since the quantity of analyzed cfDNA is directly proportional to sensitivity of diagnostic assays, this method of plasma collection, where available, could enable highly sensitive post-treatment disease monitoring and early detection of cancer in at-risk individuals.


Assuntos
Coleta de Amostras Sanguíneas/métodos , DNA/sangue , DNA/genética , Genômica , Neoplasias/sangue , Neoplasias/genética , Estudos de Casos e Controles , Sistema Livre de Células/metabolismo , Fragmentação do DNA , Humanos , Nucleossomos/genética
2.
J Immunol ; 197(7): 2854-63, 2016 10 01.
Artigo em Inglês | MEDLINE | ID: mdl-27534558

RESUMO

The loss of tolerance and the presence of circulating autoantibodies directed against nuclear Ags is the hallmark of systemic lupus erythematosus (SLE). Many of these Ags are complexed with short, noncoding RNAs, such as U1 and Y1. The amount of U1 and Y1 RNA complexed with SLE patient Abs and immune complexes was measured in a cross-section of 228 SLE patients to evaluate the role of these RNA molecules within the known biochemical framework of SLE. The study revealed that SLE patients had significantly elevated levels of circulating U1 and/or Y1 RNA compared with healthy volunteers. In addition, the blood-borne RNA molecules were correlated with SLE disease activity and increased expression of IFN-inducible genes. To our knowledge, this study provides the first systematic examination of the role of circulating RNA in a large group of SLE patients and provides an important link with IFN dysregulation.


Assuntos
Regulação da Expressão Gênica , Interferons/imunologia , Lúpus Eritematoso Sistêmico/genética , RNA/sangue , Adulto , Reações Antígeno-Anticorpo , Autoanticorpos/imunologia , Estudos de Casos e Controles , Estudos Transversais , Feminino , Humanos , Lúpus Eritematoso Sistêmico/sangue , Lúpus Eritematoso Sistêmico/imunologia , Masculino , Pessoa de Meia-Idade , RNA/imunologia , RNA Citoplasmático Pequeno/sangue , RNA Nuclear Pequeno/sangue
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