A more recent version of this article appeared on February 1, 2004.
Submitted on July 2, 2003
Revised on October 6, 2003
Accepted on November 25, 2003
Integration of proteomics and genomics in platelets: a profile of platelet proteins and platelet-specific genes
James P. McRedmond, Stephen D. Park, Dermot F. Reilly, Judith A. Coppinger, Patricia B. Maguire, Denis C. Shields, and Desmond J. Fitzgerald
Clinical Pharmacology, Royal College of Surgeons in Ireland, Dublin 2
Corresponding Author: jmcredmond{at}rcsi.ie
Platelets, while anucleate, contain RNA, some of which is translated into protein upon activation. Hypothesising that the platelet proteome is reflected in the transcriptome, we identified 82 proteins secreted from activated platelets and compared these, as well as published proteomic data, to the transcriptional profile. We also compared the transcriptome of platelets to other tissues to identify platelet-specific genes and used ontology to determine gene categories over-represented in platelets. RNA was isolated from highly pure platelet preparations for hybridization to Affymetrix oligonucleotide arrays. We identified 2,928 distinct messages as being present in platelets. The platelet transcriptome was compared to the proteome by relating both to Unigene clusters. Platelet proteomic data correlated well with the transcriptome, with 69% of secreted proteins detectable at the mRNA level, and similar concordance obtained using two published datasets. While many of the most abundant mRNAs are for known platelet proteins, messages were detected for proteins not previously reported in platelets. Some of these may represent residual megakaryocyte messages, however proteomic analysis confirmed the expression of many previoulsy unreported genes in platelets. Transcripts for well-described platelet proteins are among the most platelet-specific messages. Ontological categories related to signal transduction, receptors, ion channels and membranes are over-represented in platelets, while categories involved in protein synthesis are depleted. Despite the absence of gene transcription, the platelet proteome is mirrored in the transcriptome. Conversely, transcriptional analysis predicts the presence of novel proteins in the platelet. Transcriptional analysis is relevant to platelet biology, providing insights into platelet function and the mechanisms of platelet disorders.

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Copyright © 2003 by the American Society for Biochemistry and Molecular Biology.
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