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A comparison of selected mRNA and protein abundances in human liver
Author(s) -
Anderson Leigh,
Seilhamer Jeff
Publication year - 1997
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.1150180333
Subject(s) - messenger rna , biology , gene , secretory protein , gene expression , microbiology and biotechnology , gel electrophoresis , blood proteins , abundance (ecology) , genetics , biochemistry , fishery
In order to obtain an estimate of the overall level of correlation between mRNA and protein abundances for a well‐characterized pharmaceutically relevant biological system, we have analyzed human liver by quantitative two‐dimensional electrophoresis (for protein abundances) and by Transcript Image methodology (for mRNA abundances). Incyte's LifeSeq™ database was searched for expressed sequence tag (EST) sequences corresponding to a series of 23 proteins identified on 2‐D maps in the Large Scale Biology (LSB) Molecular Anatomy™ database, resulting in estimated abundances for 19 messages (4 were undetected) among 7926 liver clones sequenced. A correlation coefficient of 0.48 was obtained between the mRNA and protein abundances determined by the two approaches, suggesting that post‐transcriptional regulation of gene expression is a frequent phenomenon in higher organisms. A comparison with published data (Kawamoto, S., et al. , Gene 1996, 174 , 151–158) on the abundances of liver mRNAs for plasma proteins (secreted by the liver) suggests that higher abundance messages are strongly enriched in secreted sequences. Our data confirms this: of the 50 most abundant liver mRNAs, 29 coded for secreted proteins, while none of the 50 most abundant proteins appeared to be secreted products (although four plasma and red blood cell proteins were presents in this group as contaminants from tissue blood).