Cited by 73,302Genomics and Phylogenetic StudiesAlgorithms and Data CompressionFractal and DNA sequence analysis

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Gapped BLAST and PSI-BLAST: a new generation of protein database search programs

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Altschul, S.·1997·Nucleic Acids Research

Abstract

The BLAST programs are widely used tools for searching protein and DNA databases for sequence similarities. For protein comparisons, a variety of definitional, algorithmic and statistical refinements described here permits the execution time of the BLAST programs to be decreased substantially while enhancing their sensitivity to weak similarities. A new criterion for triggering the extension of word hits, combined with a new heuristic for generating gapped alignments, yields a gapped BLAST program that runs at approximately three times the speed of the original. In addition, a method is introduced for automatically combining statistically significant alignments produced by BLAST into a position-specific score matrix, and searching the database using this matrix. The resulting Position-Specific Iterated BLAST (PSI-BLAST) program runs at approximately the same speed per iteration as gapped BLAST, but in many cases is much more sensitive to weak but biologically relevant sequence similarities. PSI-BLAST is used to uncover several new and interesting members of the BRCT superfamily.

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Research works printed but not linked: 16

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Metadata

Authors
Altschul, S.
Affiliations
National Institutes of Health (US)
Corresponding author
Altschul, S.
Venue
Nucleic Acids Research
Published
1997-09-01
Volume
25
Issue
17
Pages
3389-3402
ISSN
  • 0305-1048 (ISSN-L)
  • 1362-4962
OpenAlex
W2158714788
Cited by
73,302
References
94
Citations by year
2026: 1121 · 2025: 1665 · 2024: 1892 · 2023: 1802 · 2022: 2307 · 2021: 2555 · 2020: 2507 · 2019: 2405 · 2018: 2390 · 2017: 2358 · 2016: 2551 · 2015: 2748 · 2014: 3024 · 2013: 3230 · 2012: 3272
FWCI
86.91
Type
journal article
Language
en
Open access
Locations
  • Nucleic Acids Research (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (2r01lm005110-08)
  • U.S. National Library of Medicine (LM05110)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
  • Physical Sciences › Mathematics › Theoretical Computer Science › Algorithms and Data Compression
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fractal and DNA sequence analysis
Keywords
PSI-BLAST, sequence similarity
MeSH terms
Algorithms, Amino Acid Sequence, Animals, DNA, Humans, Molecular Sequence Data, Proteins, Software, Databases, Factual, Sequence Alignment

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