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Letter

Quantitative Assessment of Transcriptome Differences Between Brain Territories

¹ Service de Biochimie et de Génétique Moléculaire, Département de Biologie Joliot-Curie, Commissariat à l'Energie Atomique (CEA) Saclay, 91191 Gif-sur-Yvette Cedex, France ² Unité de Recherche Associée CEA—Centre National de la Recherche Scientifique 2210, Service Hospitalier Frédéric Joliot, Département de Recherche Médicale, Orsay, France

Transcriptome analysis of mammalian brain structures is a potentially powerful approach in addressing the diversity of cerebral functions. Here, we used a microassay for serial analysis of gene expression (SAGE) to generate quantitative mRNA expression profiles of normal adult mouse striatum, nucleus accumbens, and somatosensory cortex. Comparison of these profiles revealed 135 transcripts heterogeneously distributed in the brain. Among them, a majority (78), although matching a registered sequence, are novel regional markers. To improve the anatomical resolution of our analysis, we performed in situ hybridization and observed unique expression patterns in discrete brain regions for a number of candidates. We assessed the distribution of the new markers in peripheral tissues using quantitative RT–PCR, Northern hybridization, and published SAGE data. In most cases, expression was higher in the brain than in peripheral tissues. Because the markers were selected according to their expression level, without reference to prior knowledge, our studies provide an unbiased, comprehensive molecular signature for various mammalian brain structures that can be used to investigate their plasticity under a variety of circumstances.

³ Present address: CNRS Unité Propre de Recherche (UPR) 9023, Montpellier, France.

⁴ Corresponding author.
E-MAIL elalouf{at}dsvidf.cea.fr; FAX 33-1-69-08-47-12.

[Supplemental material is available online at www.genome.org. SAGE data will be available at GEO (http://www.ncbi.nlm.nih.gov/geo/) under accession nos. GSM4871, GSM4873, GSM4874, GSM4875 and GSM4876, which correspond to the whole brain, lateral striatum, medial striatum, nucleus accumbens and somatosensory cortex raw SAGE data.]

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