estudo de promotores: a técnica de dna footprinting
DESCRIPTION
Estudo de promotores: a técnica de DNA footprinting. RNA. A B C. Filme raio X ou Phosphoimager?. In Situ Hybridization. In situ hybridization of a Drosophila embryo with probes for even-skipped (red) and hunchback (green). DNA imobilizado em filtros. - PowerPoint PPT PresentationTRANSCRIPT
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Estudo de promotores: a técnica de DNA footprinting
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RNA
A B C
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Filme raio X ou Phosphoimager?
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In Situ Hybridization
In situ hybridization of a Drosophila embryo with probes for even-skipped (red) and hunchback (green).
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Nuclear Run on “fotografia”
Núcleo dehepatócito
Núcleo decel de rim
Transcrição constitutivaTranscrição específica em hepatócitos
F E D C B AK J I H G LR S T V X Z
DNA imobilizado em filtros
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RT-PCR
- R
T+
RT
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Quantificação de RNA
por Real-Time PCR
Detecção de fluorescência gerada em cada ciclo de amplificação:
- SYBR green- Primers fluorescentes
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Determinação do limiar de detecção Ct
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O valor de Ct é correlacionado com a quantidade inicial de DNA amplificado
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Estudos de expressão de mRNA em escala genômica:
High throughput analysis
– Microarrays• cDNAs• Oligos• Gene chips (Affymetrix)
– ESTs
– SAGE
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Spotter – podem ser oligos ou cDNA
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Estudos de expressão de mRNA em escala genômica: DNA Microarray
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Cada cDNA de uma cor (vermelho ou verde)Igualmente ligados = amarelo
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O chip
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Sintese na lamina (chip)
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Affymetrix
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Estudos de expressão gênica: análise e quantificação de RNA
Northern blotRT-PCR e Real Time RT-PCR
Técnicas de estudo da regulação da expressão gênica DNA footprintingBand shiftTransfecção com gene reporterDuplo-híbridoCHIP (chromatin immunoprecipitation
Técnicas de estudo de expressão gênica em escala genômica
DNA MicroarrayAnálise de EST (expressed sequence tags) SAGE (serial analysis of gene expression)
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Quantificação da expressão de um mRNA
- Northern blot e RUN ON
- Proteção à RNAse H (RNA radioativo pareia)
- RT-PCR (reverse transcribed)
- Real Time PCR
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Estudo de promotores: transfecção c/ gene repórter
Luciferase assay
Genes repórteres- CAT- Luciferase- -gal (controle de transfecção)
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Estudo de promotores: a técnica de band-shiftEletrophoretic Mobility Shift Assay EMSAEletrophoretic Mobility Shift Assay EMSA
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CHIP: Imunoprecipitação da cromatina
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Análises de EST
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SAGE: Serial Analysis of Gene Expression
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Duplo-híbrido em levedura
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Estudos de expressão de mRNA em escala genômica: DNA Microarray
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Yeast genome/proteome database: 12Mb ~6000 genes (50% with assigned function)
10% involved in transcription141 with their activity tested:
myc-tagging
Anti-Myc Hybridize to DNA chip with6361 spots, representing allthe known intergenic regions in the yeast genome. Average size of the spotted PCR = 480 bp
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CHIP e Microarraypodem identificar todos os genes regulados por um mesmo fator de transcrição
6361 spots, representing all of the known intergenic regions in the yeast genome. (average size = 480 bp)
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Identificação de sequencias regulatórias
reconhecidas por uma RBP
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Estudo da regulação
da tradução
Monossomose subunidadesribossomais
Polissomos
Frações contendo mRNA associadoa polissomos cada vez maiores
Marcação de cDNA e hibridização
Uso de Microarray para identificação de genes associadosa polissomos