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Related Concept Videos

Real Time RT-PCR02:57

Real Time RT-PCR

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Real-time reverse transcription-polymerase chain reaction, or Real-time RT-PCR, is an analytical tool used to determine the expression level of target genes. The method involves converting mRNA to complementary DNA with the help of an enzyme known as reverse transcriptase, followed by the PCR amplification of the cDNA. These two processes can be performed simultaneously in a single tube or separately as a two-step reaction.
The real-time quantification of the number of amplified products is...
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Description
Sputum culture and sensitivity is a medical procedure used to diagnose bacterial infections in the respiratory tract and select the most appropriate antibiotics for treatment. This process involves analyzing sputum samples of thick and opaque secretions produced in the lungs and airways. These samples are collected from patients and then sent to the laboratory for analysis.
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Sputum studies are a critical part of diagnosing and treating numerous respiratory conditions. These studies involve obtaining sputum samples for analysis to identify pathogenic organisms and assess the presence of abnormal cells indicative of malignant conditions. This lesson will delve into three fundamental sputum studies: Gram Stain, Cytology, and Acid-fast Smear and Culture.
Gram Stain
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Related Experiment Video

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Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae
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Suitable reference genes determination for real-time PCR using induced sputum samples.

Catherine Moermans1,2, Esteban Deliege3, Dimitri Pirottin4,5

  • 1Dept of Pneumology-Allergology, CHU of Liege, Liege, Belgium.

The European Respiratory Journal
|October 12, 2019
PubMed
Summary
This summary is machine-generated.

Identifying stable reference genes like HPRT1 and GNB2L1 is crucial for accurate gene expression analysis in airway diseases. This study found these genes reliable for normalizing quantitative reverse transcriptase PCR data from sputum cells in asthma and COPD patients.

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Area of Science:

  • Pulmonary Medicine
  • Molecular Biology
  • Biochemistry

Background:

  • Induced sputum is a non-invasive method for airway cell collection.
  • Gene expression analysis in sputum aids understanding of airway diseases like asthma and COPD.
  • Lack of validated reference genes hinders reliable gene expression studies in sputum.

Purpose of the Study:

  • To identify and validate stable reference genes for normalizing gene expression data from induced sputum.
  • To assess the expression stability of nine candidate reference genes using multiple algorithms.
  • To confirm the reliability of identified reference genes across different sample processing methods.

Main Methods:

  • Sputum samples were collected from healthy volunteers, asthma, and COPD patients.
  • Expression stability of nine reference genes was analyzed using geNorm, NormFinder, and BestKeeper algorithms.
  • Validation was performed using a separate patient cohort with varied RNA extraction and RT-PCR protocols.

Main Results:

  • HPRT1 and GNB2L1 were identified as the most stable reference genes across different algorithms.
  • The stability of HPRT1 and GNB2L1 was confirmed in a validation cohort, irrespective of RNA extraction and RT-PCR methods.
  • Normalization with HPRT1 and GNB2L1 improved the accuracy of gene expression quantification for eosinophil and neutrophil markers.

Conclusions:

  • HPRT1 and GNB2L1 are recommended as optimal reference genes for quantitative RT-PCR in induced sputum from patients with airway diseases.
  • These reference genes ensure reliable and accurate gene expression analysis in pulmonary research.
  • The findings provide a foundation for standardized gene expression studies in asthma and COPD.