Expressão gênica em síndrome mielodisplásica do subtipo AREB
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Data
2010-10-05
Autores
Mendiburu, Carlos Fabián [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O subtipo Anemia Refrataria com Excesso de Blastos (AREB) representa cerca de 30% dos casos de Síndromes Mielodisplásicas (SMD). Os pacientes apresentam uma sobrevida media de poucos meses e risco alto de progressão para Leucemia Mielóide Aguda. As bases moleculares da doença não estão elucidadas. O objetivo do presente trabalho foi investigar a expressão gênica das células da medula óssea (MO) de pacientes com AREB. Foi gerada a primeira biblioteca SAGE de AREB, ao diagnostico, a partir de amostras de MO de seis pacientes. A comparação entre as bibliotecas AREB e normal evidenciou genes diferencialmente expressos. Cinco genes hipo-expressos, TXNIP, SGPL1, NUMB, FOXO e MSH2, e outros cinco hiper-expressos, MIF, RHOG, ICAM3, CHI3L1 e NOTCH1 foram selecionados para validação nas amostras coletadas ao diagnostico e dos mesmos pacientes após seis meses do diagnóstico, por PCR em tempo real. O padrão de expressão dos cinco genes hipo-expressos e dois hiper-expressos, MIF e RHOG foi confirmado, ao diagnostico, em 60% dos pacientes. Os genes NUMB e RHOG mostraram o mesmo padrão de expressão após seis meses de evoluçlão da doença, enquanto o gene. NOTCH1 apresentou hiper-expressão em duas amostras. Os dados aqui obtidos mostram que a criação da biblioteca SAGE de AREB permite o estudo de genes possivelemente envolvidos na origem e evolução da doença. As células da MO de pacientes com AREB apresentam um perfil de expressão gênica diferente das celulas de MO normal. Os genes TXNIP, SGPL1, NUM e, FOXO3, e MSH2, MIF e RHOG, estão hipo e hiper-expressos, respectivamente, ao diagnóstico. NUMB e RHOG mantêm seu padrão de expressão após seis meses, mas NOTCH1 parece aumentar sua expressão após este período.,Estes resultados devem ser confirmados em um número maior de amostras, no entanto, demonstram que a expressão alterada dos genes FOXO3, NUMB, SGPL1, TXNIP, MSH2...
The refractory anemia with excess blast (RAEB) subtype represents approximately 30% of Myelodysplastic Syndrome (MDS) cases. Patients with RABE have survival rates of a few months and a high risk for progression to acute myeloid leukemia. The molecular basis of the disease is not elucidated yet. This study aimed at analyzing the gene expression profile of bone marrow (BM) cells in patients with RAEB. We created the first SAGE library of RAEB at diagnosis using the BM cells of six patients. A comparison between RAEB and normal SAGE libraries show differentially expressed genes. Five under-expressed genes, TXNIP, SGPL1, NUMB, FOXO3 and MSH2 and five over-expressed genes, MIF, RHOG, ICAM3, CHI3L1 and NOTCH1, were selected for validation using real time PCR with samples collected at diagnosis and samples from the same patients collected six months after diagnosis. The pattern of expression of the five under-expressed genes and two overexpressed genes (MIF and RHOG) was validated at diagnosis in 60% of the patients. The NUMB and RHOG genes show the same expression pattern six months after diagnosis. NOTCH1 continued over-expressed in two samples six months after diagnosis. Our results show that the creation of the RAEB SAGE library allowed an analysis of genes passively involved in the genesis and progression of disease. BM cells from patients with REAB show a different gene expression profile to normal BM. The TXNIP, SGPL1, NUMB, FOXO3, and MSH2 genes are under-expressed and MIF and RHOG are over-expressed at diagnosis. NUMB and RHOG conserved their expression pattern six months after diagnosis and NOTHC1 gene increase its expression in this period. However, the results should be confirmed in studies with a larger number of cases with abnormal expressions for the FOXO3, NUMB, SGPL1, TXNIP, MSH2, MIF, RHOG and NOTCH1 genes. As these genes may play a role in the pathogenesis and progression... (Complete abstract click electronic access below)
The refractory anemia with excess blast (RAEB) subtype represents approximately 30% of Myelodysplastic Syndrome (MDS) cases. Patients with RABE have survival rates of a few months and a high risk for progression to acute myeloid leukemia. The molecular basis of the disease is not elucidated yet. This study aimed at analyzing the gene expression profile of bone marrow (BM) cells in patients with RAEB. We created the first SAGE library of RAEB at diagnosis using the BM cells of six patients. A comparison between RAEB and normal SAGE libraries show differentially expressed genes. Five under-expressed genes, TXNIP, SGPL1, NUMB, FOXO3 and MSH2 and five over-expressed genes, MIF, RHOG, ICAM3, CHI3L1 and NOTCH1, were selected for validation using real time PCR with samples collected at diagnosis and samples from the same patients collected six months after diagnosis. The pattern of expression of the five under-expressed genes and two overexpressed genes (MIF and RHOG) was validated at diagnosis in 60% of the patients. The NUMB and RHOG genes show the same expression pattern six months after diagnosis. NOTCH1 continued over-expressed in two samples six months after diagnosis. Our results show that the creation of the RAEB SAGE library allowed an analysis of genes passively involved in the genesis and progression of disease. BM cells from patients with REAB show a different gene expression profile to normal BM. The TXNIP, SGPL1, NUMB, FOXO3, and MSH2 genes are under-expressed and MIF and RHOG are over-expressed at diagnosis. NUMB and RHOG conserved their expression pattern six months after diagnosis and NOTHC1 gene increase its expression in this period. However, the results should be confirmed in studies with a larger number of cases with abnormal expressions for the FOXO3, NUMB, SGPL1, TXNIP, MSH2, MIF, RHOG and NOTCH1 genes. As these genes may play a role in the pathogenesis and progression... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Expressão gênica, Reação em cadeia de polimerase, Síndrome mielodisplásica - Subtipo AREB, Síndrome mielodisplásica - Aspectos genéticos, Expressão genética, SAGE, PCR em tempo real, Genetics - Expression
Como citar
MENDIBURU, Carlos Fabián. Expressão gênica em síndrome mielodisplásica do subtipo AREB. 2009. 130 f. Tese (doutorado) - Universidade Estadual Paulista, Instituto de Biociências, Letras e Ciências Exatas, 2009.