Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 10 de 10
Filtrar
3.
Leukemia ; 23(1): 125-33, 2009 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-18923437

RESUMO

Episomes with the NUP214-ABL1 fusion gene have been observed in 6% of T-ALL. In this multicentric study we collected 27 cases of NUP214-ABL1-positive T-ALL. Median age was 15 years with male predominance. Outcome was poor in 12 patients. An associated abnormality involving TLX1 or TLX3 was found in all investigated cases. Fluorescent in situ hybridization revealed a heterogeneous pattern of NUP214-ABL1 amplification. Multiple episomes carrying the fusion were detected in 24 patients. Episomes were observed in a significant number of nuclei in 18 cases, but in only 1-5% of nuclei in 6. In addition, intrachromosomal amplification (small hsr) was identified either as the only change or in association with episomes in four cases and two T-ALL cell lines (PEER and ALL-SIL). One case showed insertion of apparently non-amplified NUP214-ABL1 sequences at 14q12. The amplified sequences were analyzed using array-based CGH.These findings confirm that the NUP214-ABL1 gene requires amplification for oncogenicity; it is part of a multistep process of leukemogenesis; and it can be a late event present only in subpopulations. Data also provide in vivo evidence for a model of episome formation, amplification and optional reintegration into the genome. Implications for the use of kinase inhibitors are discussed.


Assuntos
Amplificação de Genes , Leucemia-Linfoma de Células T do Adulto/genética , Proteínas de Fusão Oncogênica/genética , Adolescente , Adulto , Linhagem Celular Tumoral , Criança , Pré-Escolar , Feminino , Proteínas de Homeodomínio/genética , Humanos , Leucemia-Linfoma de Células T do Adulto/etiologia , Masculino , Pessoa de Meia-Idade , Plasmídeos , Proteínas Proto-Oncogênicas/genética , Fatores Sexuais , Resultado do Tratamento , Adulto Jovem
8.
Cancer Genet Cytogenet ; 125(2): 167-70, 2001 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-11369063

RESUMO

An unusual cytogenetic rearrangement, described as ins(22;9)(q11;q34q21), was detected in a 49-year-old male patient diagnosed with chronic myeloid leukemia (CML). Reverse transcriptase polymerase chain reaction (RT-PCR) revealed a b3a2 fusion transcript. In order to confirm the cytogenetic findings and fully characterize the inverted insertion, we performed fluorescence in situ hybridization (FISH) assays using locus-specific and whole chromosome painting probes. Our FISH analysis showed the presence of the BCR/ABL fusion gene, verified the insertion and determined that the breakpoint on chromosome 22 where the insertion took place was located proximal to the BCR gene and distal to the TUPLE1 gene on 22q11.


Assuntos
Biomarcadores Tumorais/genética , Inversão Cromossômica , Cromossomos Humanos Par 22/ultraestrutura , Cromossomos Humanos Par 9/ultraestrutura , Proteínas de Fusão bcr-abl/genética , Leucemia Mielogênica Crônica BCR-ABL Positiva/genética , Translocação Genética , Biomarcadores Tumorais/análise , Medula Óssea/patologia , Bandeamento Cromossômico , Quebra Cromossômica , Coloração Cromossômica , Cromossomos Humanos Par 22/genética , Cromossomos Humanos Par 9/genética , Células Clonais/patologia , Proteínas de Fusão bcr-abl/análise , Humanos , Cariotipagem , Leucemia Mielogênica Crônica BCR-ABL Positiva/metabolismo , Leucemia Mielogênica Crônica BCR-ABL Positiva/patologia , Masculino , Pessoa de Meia-Idade , Modelos Genéticos , Mutagênese Insercional , Reação em Cadeia da Polimerase Via Transcriptase Reversa
9.
Genes Chromosomes Cancer ; 31(2): 134-42, 2001 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-11319801

RESUMO

TEL/ETV6 is the first transcription factor identified that is specifically required for hematopoiesis within the bone marrow. This gene has been found to have multiple fusion partners; 35 different chromosome bands have been involved in ETV6 translocations, of which 13 have been cloned. To identify additional ETV6 partner genes and to characterize the chromosomal abnormalities more fully, we studied bone marrow samples from patients known to have rearrangements of 12p, using fluorescence in situ hybridization (FISH) and spectral karyotyping (SKY). FISH analysis was done with 14 probes located on 12p12.1 to 12p13.3. Nine ETV6 rearrangements were identified using FISH. The aberrations include t(1;12)(p36;p13), t(4;12)(q12;p13) (two patients), t(4;12)(q22;p13), t(6;12)(p21;p13), der(6)t(6;21)(q15;q?)t(12;21)(p13;q22), t(6;12)(q25;p13), inv(12)(p13q24), and t(2;2;5;12;17)(p25;q23;q31;p13;q12). Six new ETV6 partner bands were identified: 1p36, 4q22, 6p21, 6q25, 12q24, and 17q12. Our present data as well previous data from us and from other researchers suggest that ETV6 is involved in 41 translocations. The breakpoints in ETV6 were upstream from the exons coding for the HLH (helix-loop-helix) domain in six cases. Although cytogenetic analysis identified 12p abnormalities in all cases, FISH and SKY detected new and unexpected chromosomal rearrangements in many of them. Thus, complete characterization of the samples was achieved by using all three techniques in combination.


Assuntos
Proteínas de Ligação a DNA/genética , Neoplasias Hematológicas/genética , Hibridização in Situ Fluorescente/métodos , Proteínas Repressoras , Fatores de Transcrição/genética , Translocação Genética/genética , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Células da Medula Óssea/patologia , Criança , Pré-Escolar , Coloração Cromossômica , Feminino , Humanos , Cariotipagem/métodos , Masculino , Pessoa de Meia-Idade , Proteínas Proto-Oncogênicas c-ets , Variante 6 da Proteína do Fator de Translocação ETS
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...