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JournalISSN: 0027-8424

Proceedings of the National Academy of Sciences of the United States of America

About: Proceedings of the National Academy of Sciences of the United States of America is an academic journal. The journal publishes majorly in the area(s): Gene & Population. It has an ISSN identifier of 0027-8424. Over the lifetime, 145675 publication(s) have been published receiving 18562120 citation(s). The journal is also known as: National Academy of Sciences. Proceedings & PNAS. more

Topics: Gene, Population, RNA more

Open accessJournal ArticleDOI: 10.1073/PNAS.74.12.5463
Abstract: A new method for determining nucleotide sequences in DNA is described. It is similar to the “plus and minus” method [Sanger, F. & Coulson, A. R. (1975) J. Mol. Biol. 94, 441-448] but makes use of the 2′,3′-dideoxy and arabinonucleoside analogues of the normal deoxynucleoside triphosphates, which act as specific chain-terminating inhibitors of DNA polymerase. The technique has been applied to the DNA of bacteriophage ϕX174 and is more rapid and more accurate than either the plus or the minus method. more

Topics: Dideoxynucleotide (60%), DNA polymerase (59%), Maxam–Gilbert sequencing (58%) more

61,850 Citations

Open accessJournal ArticleDOI: 10.1073/PNAS.76.9.4350
Abstract: A method has been devised for the electrophoretic transfer of proteins from polyacrylamide gels to nitrocellulose sheets. The method results in quantitative transfer of ribosomal proteins from gels containing urea. For sodium dodecyl sulfate gels, the original band pattern was obtained with no loss of resolution, but the transfer was not quantitative. The method allows detection of proteins by autoradiography and is simpler than conventional procedures. The immobilized proteins were detectable by immunological procedures. All additional binding capacity on the nitrocellulose was blocked with excess protein; then a specific antibody was bound and, finally, a second antibody directed against the first antibody. The second antibody was either radioactively labeled or conjugated to fluorescein or to peroxidase. The specific protein was then detected by either autoradiography, under UV light, or by the peroxidase reaction product, respectively. In the latter case, as little as 100 pg of protein was clearly detectable. It is anticipated that the procedure will be applicable to analysis of a wide variety of proteins with specific reactions or ligands. more

Topics: Electroblotting (61%), Southwestern blot (56%), Perinuclear theca (53%) more

52,608 Citations

Open accessJournal ArticleDOI: 10.1073/PNAS.0506580102
Abstract: Although genomewide RNA expression analysis has become a routine tool in biomedical research, extracting biological insight from such information remains a major challenge. Here, we describe a powerful analytical method called Gene Set Enrichment Analysis (GSEA) for interpreting gene expression data. The method derives its power by focusing on gene sets, that is, groups of genes that share common biological function, chromosomal location, or regulation. We demonstrate how GSEA yields insights into several cancer-related data sets, including leukemia and lung cancer. Notably, where single-gene analysis finds little similarity between two independent studies of patient survival in lung cancer, GSEA reveals many biological pathways in common. The GSEA method is embodied in a freely available software package, together with an initial database of 1,325 biologically defined gene sets. more

26,320 Citations

Open accessJournal ArticleDOI: 10.1073/PNAS.95.25.14863
Abstract: A system of cluster analysis for genome-wide expression data from DNA microarray hybridization is de- scribed that uses standard statistical algorithms to arrange genes according to similarity in pattern of gene expression. The output is displayed graphically, conveying the clustering and the underlying expression data simultaneously in a form intuitive for biologists. We have found in the budding yeast Saccharomyces cerevisiae that clustering gene expression data groups together efficiently genes of known similar function, and we find a similar tendency in human data. Thus patterns seen in genome-wide expression experiments can be inter- preted as indications of the status of cellular processes. Also, coexpression of genes of known function with poorly charac- terized or novel genes may provide a simple means of gaining leads to the functions of many genes for which information is not available currently. more

Topics: DNA microarray (57%), Gene expression profiling (56%), Gene cluster (56%) more

16,000 Citations

Open accessJournal ArticleDOI: 10.1073/PNAS.79.8.2554
Abstract: Computational properties of use of biological organisms or to the construction of computers can emerge as collective properties of systems having a large number of simple equivalent components (or neurons). The physical meaning of content-addressable memory is described by an appropriate phase space flow of the state of a system. A model of such a system is given, based on aspects of neurobiology but readily adapted to integrated circuits. The collective properties of this model produce a content-addressable memory which correctly yields an entire memory from any subpart of sufficient size. The algorithm for the time evolution of the state of the system is based on asynchronous parallel processing. Additional emergent collective properties include some capacity for generalization, familiarity recognition, categorization, error correction, and time sequence retention. The collective properties are only weakly sensitive to details of the modeling or the failure of individual devices. more

Topics: Sparse distributed memory (56%), Physical system (53%), Autoassociative memory (52%) more

15,722 Citations

No. of papers from the Journal in previous years

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Journal's top 5 most impactful authors

Carlo M. Croce

177 papers, 45.9K citations

Jack L. Strominger

168 papers, 19.4K citations

Solomon H. Snyder

159 papers, 41.6K citations

Gerald M. Edelman

124 papers, 20.6K citations

Paul Greengard

102 papers, 16.1K citations

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