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DNA Microarrays02:34

DNA Microarrays

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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Determining Genetic Expression Profiles in C. elegans Using Microarray and Real-time PCR
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Molars and incisors: show your microarray IDs.

Virginie Laugel-Haushalter1, Marie Paschaki, Christelle Thibault-Carpentier

  • 1Developmental Biology and Stem Cells Department, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, BP 10142, 1 rue Laurent Fries, Illkirch Cedex, 67404, France.

BMC Research Notes
|March 28, 2013
PubMed
Summary

Researchers identified gene expression differences between mouse incisors and molars, revealing regulatory networks crucial for tooth type identity. These findings aid understanding of dental development and anomalies.

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Area of Science:

  • Developmental Biology
  • Genomics
  • Molecular Biology

Background:

  • Understanding how conserved signaling pathways generate diverse organ structures is a key developmental biology question.
  • Tooth types offer a model system to study differential molecular signatures.
  • Comparative transcriptomic analysis was used to investigate developing murine teeth.

Purpose of the Study:

  • To identify molecular signatures distinguishing different tooth types in mice.
  • To explore regulatory networks underlying incisor and molar development.

Main Methods:

  • Comparative transcriptomic analysis of murine lower incisors, mandibular molars, and maxillary molars at the cap stage (E14.5).
  • Differential gene expression analysis using fold change and false discovery rate thresholds.
  • Validation of gene expression using quantitative reverse transcription-PCR (qRT-PCR).
  • Bioinformatic analysis (Ingenuity Pathway Analysis) to identify biological functions and networks.

Main Results:

  • 231 genes showed differential expression between mandibular incisors and molars (FC > 2, FDR < 0.1); 96 genes between mandibular and maxillary molars.
  • Key signaling pathways (Hedgehog, Notch, Wnt, FGF, TGFβ/BMP, retinoic acid) and homeobox genes were identified.
  • Differential expression of selected genes was confirmed by qRT-PCR.
  • Bioinformatics revealed 143 differentially expressed genes in 9 networks, with TNF/NFκB and ERK1/2 kinases as central nodes. ERK1/2 kinases and tretinoin networks were implicated in molar morphogenesis.

Conclusions:

  • Regulatory networks distinguishing incisor versus molar identity were constructed.
  • These networks offer insights into tooth-specific ontogenetic programs.
  • Understanding these programs may help investigate dental anomalies in transgenic models and human diseases.