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Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
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Position-Specific Gene Expression Analysis Using a Microgram Dissection Method Combined with On-Bead cDNA Library

Tomoharu Kajiyama1, Akihiko Fujii2, Kouji Arikawa2

  • 1Central Research Laboratory, Hitachi, Ltd., Tokyo, 185-8601, Japan hideki.kambara.se@hitachi.com tomoharu.kajiyama.jy@hitachi.com.

Plant & Cell Physiology
|June 21, 2015
PubMed
Summary

Researchers developed a new method for gene expression profiling in plants, enabling analysis of fresh tissue microsamples. This technique accurately distinguishes gene expression patterns in small plant domains like the shoot apex.

Keywords:
Dissection needleMicrodissectionOrgan-specific transcriptomePosition-specific gene expressionSubnanogram RNAWhole-genome transcriptome

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genomics

Background:

  • Gene expression analysis is crucial for understanding plant biology.
  • Isolating plant cells for gene expression studies is challenging due to rigid cell walls.
  • Existing methods like laser dissection require sample fixation, introducing limitations.

Purpose of the Study:

  • To develop a novel, reliable method for gene expression profiling in small plant tissue samples.
  • To overcome the limitations of current plant tissue isolation techniques.
  • To enable high-resolution spatial analysis of gene expression in plants.

Main Methods:

  • Assembly of a dissection apparatus using a sharpened needle for automated microsample extraction (0.1-0.2 mm).
  • Optimization of a protocol for synthesizing high-quality cDNA libraries on magnetic beads from single microsamples.
  • High-throughput sequencing of amplified cDNA libraries for gene expression profiling.

Main Results:

  • Development of a stable and reliable system for gene expression profiling in small plant regions.
  • Successful analysis of gene expression patterns at 50 µm intervals in Arabidopsis thaliana shoot apex.
  • Clear distinction between the shoot apical meristem and leaf primordia based on gene expression data.

Conclusions:

  • The developed system provides a robust method for spatial gene expression profiling in plants.
  • This technique facilitates the investigation of gene expression in small, adjacent tissue domains.
  • The system has broad applicability for studying gene expression organization in various plant contexts.