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Analysis of mRNA with microsomal fractionation using a SAGE-based DNA microarray system facilitates identification of
Nobuaki Toyoda1, Shigenori Nagai, Yuya Terashima
1Department of Molecular Preventive Medicine & SORST, School of Medicine, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
Abstract:
In the regulation of host defense responses such as inflammation and immunity, the secretory proteins, including membrane proteins, play central roles. Although many secretory proteins have been identified by using methods such as differential display, random screening, or the signal sequence trap method, each method suffers from poor reproducibility, low sensitivity, or time-consuming or laborious work. Therefore, the strategy for facilitating the selection of the genes encoding the secretory proteins is desired. In this paper, we describe a system for isolating the genes encoding secretory proteins by analyzing mRNAs with microsomal fractionation on serial analysis of gene expression (SAGE)-based DNA microarray system. This system succeeded in discriminating the genes encoding secretory proteins from ones encoding nonsecretory proteins with 80% accuracy. We applied this system to human T lymphocytes. As a result, we were able to identify the genes that are not only encoding secretory proteins but also expressing selectively in a specific subset of T lymphocytes. The SAGE-based DNA microarray system is a promising system to identify the genes encoding specific secretory proteins.
Insights
This study introduces a novel system using microsomal fractionation and serial analysis of gene expression (SAGE)-based DNA microarrays to identify genes encoding secretory proteins. The method accurately distinguishes secretory from nonsecretory proteins, aiding host defense research.
Area of Science:
- Molecular Biology
- Immunology
- Genomics
Background:
- Secretory and membrane proteins are crucial for host defense, inflammation, and immunity.
- Existing methods for identifying these proteins lack reproducibility, sensitivity, or are labor-intensive.
Purpose of the Study:
- To develop an efficient and accurate system for isolating genes that encode secretory proteins.
- To apply this system to identify novel secretory proteins in human T lymphocytes.
Main Methods:
- Utilized microsomal fractionation combined with a serial analysis of gene expression (SAGE)-based DNA microarray system.
- Analyzed messenger RNAs (mRNAs) to differentiate between secretory and nonsecretory protein-encoding genes.
Main Results:
- The developed system achieved 80% accuracy in discriminating between genes encoding secretory and nonsecretory proteins.
- Successfully identified genes encoding secretory proteins with selective expression in specific subsets of human T lymphocytes.
Conclusions:
- The SAGE-based DNA microarray system offers a promising approach for the efficient identification of genes encoding specific secretory proteins.
- This technology can advance research in host defense mechanisms and T lymphocyte function.