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PMID: 23405139 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Expression profile of ectopic olfactory receptors determined by deep sequencing.

PloS one ·Vol. 8 ·No. 2 ·2013-00-00 ·Pages e55368

Flegel C, Manteniotis S, Osthold S, Hatt H, Gisselmann G

Abstract

Olfactory receptors (ORs) provide the molecular basis for the detection of volatile odorant molecules by olfactory sensory neurons. The OR supergene family encodes G-protein coupled proteins that belong to the seven-transmembrane-domain receptor family. It was initially postulated that ORs are exclusively expressed in the olfactory epithelium. However, recent studies have demonstrated ectopic expression of some ORs in a variety of other tissues. In the present study, we conducted a comprehensive expression analysis of ORs using an extended panel of human tissues. This analysis made use of recent dramatic technical developments of the so-called Next Generation Sequencing (NGS) technique, which encouraged us to use open access data for the first comprehensive RNA-Seq expression analysis of ectopically expressed ORs in multiple human tissues. We analyzed mRNA-Seq data obtained by Illumina sequencing of 16 human tissues available from Illumina Body Map project 2.0 and from an additional study of OR expression in testis. At least some ORs were expressed in all the tissues analyzed. In several tissues, we could detect broadly expressed ORs such as OR2W3 and OR51E1. We also identified ORs that showed exclusive expression in one investigated tissue, such as OR4N4 in testis. For some ORs, the coding exon was found to be part of a transcript of upstream genes. In total, 111 of 400 OR genes were expressed with an FPKM (fragments per kilobase of exon per million fragments mapped) higher than 0.1 in at least one tissue. For several ORs, mRNA expression was verified by RT-PCR. Our results support the idea that ORs are broadly expressed in a variety of tissues and provide the basis for further functional studies.

MeSH Terms
Adult Exons Female Gene Expression Profiling/methods High-Throughput Nucleotide Sequencing/methods Humans Middle Aged Olfactory Receptor Neurons/metabolism Pseudogenes RNA, Messenger/genetics Receptors, Odorant/genetics Signal Transduction Smell/genetics Transcriptome
Chemicals
RNA, Messenger Receptors, Odorant
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Flegel Caroline
Department of Cell Physiology, Ruhr-University Bochum, Bochum, Germany.
Manteniotis Stavros
Osthold Sandra
Hatt Hanns
Gisselmann Günter
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Article Info
Journal
PloS one
Abbr.
PLoS One
ISSN
1932-6203
Published
2013-00-00
Epub
2013-00-06
Pages
e55368
Language
English
Region
United States
NLM ID
101285081
PMCID
PMC3566163
Subset
IM
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