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Related Concept Videos

What is Gene Expression?01:42

What is Gene Expression?

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Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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Gene expression analysis on a photodiode array-based bioluminescence analyzer by using sensitivity-improved SRPP.

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|May 26, 2010
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Summary
This summary is machine-generated.

A new dye-free gene expression analysis method, Sequence-tagged reverse-transcription polymerase chain reaction coupled with pyrosequencing (SRPP), was enhanced for higher throughput and sensitivity. This improved method accurately analyzes prognostic marker genes in breast cancer tissues.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biotechnology

Background:

  • Traditional gene expression analysis methods rely on costly dye-labeling techniques and equipment.
  • The Sequence-tagged reverse-transcription polymerase chain reaction coupled with pyrosequencing (SRPP) offers a dye-free alternative but suffers from limited throughput due to photomultiplier tube (PMT) detection.
  • Coupling SRPP with a photodiode (PD) array-based bioluminescence analyzer increased throughput but reduced sensitivity, hindering the analysis of low-abundance genes.

Purpose of the Study:

  • To enhance the throughput and sensitivity of the SRPP assay for gene expression analysis.
  • To enable the reliable detection of low-abundance genes in clinical samples, specifically for breast cancer research.
  • To develop a cost-effective and sensitive gene expression analysis tool.

Main Methods:

  • Modified the SRPP assay by replacing sequence-tagged poly (T)(n) primers with sequence-tagged gene-specific primers for reverse transcription.
  • Coupled the modified SRPP with an inexpensive photodiode (PD) array-based bioluminescence analyzer to increase throughput.
  • Validated the enhanced SRPP method by analyzing the expression levels of ten prognostic marker genes in breast cancer tissues.

Main Results:

  • The use of gene-specific primers improved SRPP sensitivity by over 10 times, compensating for the reduced sensitivity of the PD detector.
  • The enhanced SRPP method demonstrated reliable and accurate determination of gene expression levels for ten prognostic markers.
  • The method successfully differentiated gene expression between normal and tumor tissues in breast cancer patients.

Conclusions:

  • The enhanced SRPP assay, utilizing gene-specific RT primers and a PD array-based bioluminescence analyzer, is a reliable, inexpensive, and sensitive method for gene expression analysis.
  • This improved technique overcomes the limitations of previous SRPP methods, enabling the study of low-abundance genes in clinical settings.
  • The findings support the application of this enhanced SRPP for analyzing prognostic marker genes in breast cancer and potentially other diseases.