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Genechip mirna 4.0 microarrays

Manufactured by Thermo Fisher Scientific
Sourced in Spain

The GeneChip miRNA 4.0 microarrays are a lab equipment product designed for the detection and analysis of microRNA (miRNA) expression. The microarrays provide comprehensive coverage of mature miRNA sequences from multiple species. The product enables researchers to study miRNA profiles and their role in various biological processes.

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5 protocols using genechip mirna 4.0 microarrays

1

Microarray Analysis of Colorectal Tumorigenesis

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For microarray analysis, we performed polyadenylation and labeling of RNA (200 ng) using a FlashTag Biotin HSR RNA Labeling kit. The RNA was then treated with DNA ligase, hybridized to GeneChip miRNA 4.0 microarrays (Thermo Fisher Scientific) by incubation for 16 h at 48°C, washed, and stained using streptavidin-PE solution. Next, scanning of the stained arrays was carried out using a GeneChip Scanner 3000 7G System (Thermo Fisher Scientific). The Affymetrix miRNA 4.0 microarray used in this study contained 6,631 probes, with 2,570 mature miRNA probes. The methods used here were described in detail in a previous study (22 (link)).
To identify candidate miRNAs associated with colorectal tumorigenesis, we then assessed miRNA expression based on the following criteria: less than or greater than 1.5 fold-change in expression compared with normal glands and a p value less than 0.05 based on Student’s t-test (without multiple comparison tests).
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2

Microarray Analysis of miRNA Expression

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For microarray analysis, 200 ng RNA was polyadenylated and labelled using a FlashTag™ Biotin HSR RNA Labelling kit and then treated with DNA ligase. The labeled RNA was hybridized to GeneChip miRNA 4.0 microarrays (Thermo Fisher Scientific) at 48°C for 16 h, followed by washing and staining using a streptavidin-PE solution. The stained arrays were scanned using a GeneChip™ Scanner 3000 7G System (Thermo Fisher Scientific). The Affymetrix miRNA 4.0 microarray contains 6,631 probes on the array, including 2,570 mature miRNA probes. Detailed methods have been described previously (26 (link)).
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3

Microarray Analysis of miRNA Expression

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For microarray analysis, 200 ng RNA was polyadenylated and labeled using a FlashTag Biotin HSR RNA Labeling kit and then treated with DNA ligase. The labeled RNA was hybridized to GeneChip miRNA 4.0 microarrays (Thermo Fisher Scientific) at 48 °C for 16 h, followed by washing and staining using a streptavidin–PE solution. The Affymetrix miRNA 4.0 microarray contains 6631 probes, including 2570 mature miR probes. The stained arrays were assessed using a GeneChip Scanner 3000 7G System (Thermo Fisher Scientific). Detailed methods have been described previously [15 (link)].
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4

miRNA profiling in DLBCL prognosis

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After obtaining the samples, RNA purification from formalin-fixed paraffin-embedded tissue sections was performed with RecoverAllTM Total Nucleic Acid Isolation Kit (ThermoFisher Scientific, Madrid, Spain). Later, miRNA screening was performed using GeneChip™ miRNA 4.0 microarrays (ThermoFisher Scientific, Madrid, Spain), which included 6631 miRNA-related probes (2578 mature miRNAs, 2025 pre-miRNAs, 1996 Human snoRNA, CDBox RNA, and other non-coding RNAs).
Subsequently, bioinformatic analysis of the miRNAs with differential expression was conducted in a discovery group including two cohorts (patients with durable complete remission (CR) versus refractory or early relapsing (RR) patients). Differentially expression miRNAs were validated in the entire series using quantitative RT-PCR with Sybr Green probes (EPIK miRNA Select Lo-ROX kit). The relevance of these miRNAs as predictors of EFS and OS as well as their relationship with standard prognostic factors in DLBCL were also determined.
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5

Profiling miRNA Expression in Tissues

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For microarray analysis, 200 ng RNA was polyadenylated and labeled using the FlashTag™ Biotin HSR RNA Labeling kit (Thermo Fisher Scientific, Aaltham, MA, USA) and then treated with DNA ligase. The labeled RNA was hybridized to GeneChip miRNA 4.0 microarrays (Thermo Fisher Scientific) at 48 °C for 16 h, followed by washing and staining with a streptavidin–PE solution. Stained arrays were scanned using the GeneChip™ Scanner 3000 7G System (Thermo Fisher Scientific). Array data were generated using GeneSpring (version 14.9.1, Agilent Technologies). miRNA expression was examined according to the following criteria: p < 0.05 with adjusted Benjamini–Hochberg/FDR correction and fold change in expression >1.5 compared with expression in normal glands using the paired t‐test.
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