PMID- 28654728 OWN - NLM STAT- MEDLINE DCOM- 20171106 LR - 20200108 IS - 1934-340X (Electronic) IS - 1934-3396 (Linking) VI - 58 DP - 2017 Jun 27 TI - Finding Similar Nucleotide Sequences Using Network BLAST Searches. PG - 3.3.1-3.3.25 LID - 10.1002/cpbi.29 [doi] AB - The Basic Local Alignment Search Tool (BLAST) is the first tool in the annotation of nucleotide or amino acid sequences. BLAST is a flagship of bioinformatics due to its performance and user-friendliness. Beginners and intermediate users will learn how to design and submit blastn and Megablast searches on the Web pages at the National Center for Biotechnology Information. We map nucleic acid sequences to genomes, find identical or similar mRNAs, expressed sequence tag, and noncoding RNA sequences, and run Megablast searches, which are much faster than blastn. Understanding results is assisted by taxonomy reports, genomic views, and multiple alignments. We interpret expected frequency thresholds, biological significance, and statistical significance. Weak hits provide no evidence, but indicate hints for further analyses. We find genes that may code for homologous proteins by translated BLAST. We reduce false positives by filtering out low-complexity regions. Parsed BLAST results can be integrated into analysis pipelines. Links in the output connect to Entrez and PubMed, as well as structural, sequence, interaction, and expression databases. This facilitates integration with a wide spectrum of biological knowledge. (c) 2017 by John Wiley & Sons, Inc. CI - Copyright (c) 2017 John Wiley & Sons, Inc. FAU - Ladunga, Istvan AU - Ladunga I AD - Departments of Statistics, Biochemistry, and School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska. LA - eng PT - Journal Article DEP - 20170627 PL - United States TA - Curr Protoc Bioinformatics JT - Current protocols in bioinformatics JID - 101157830 SB - IM MH - Amino Acid Sequence MH - Computational Biology/*methods MH - Internet MH - Sequence Analysis/*methods MH - *Software OTO - NOTNLM OT - BLAST OT - DNA OT - Megablast OT - RNA OT - blastn OT - database search OT - genome OT - homology search OT - mapping OT - nucleic acid OT - sequence alignment EDAT- 2017/06/28 06:00 MHDA- 2017/11/07 06:00 CRDT- 2017/06/28 06:00 PHST- 2017/06/28 06:00 [entrez] PHST- 2017/06/28 06:00 [pubmed] PHST- 2017/11/07 06:00 [medline] AID - 10.1002/cpbi.29 [doi] PST - epublish SO - Curr Protoc Bioinformatics. 2017 Jun 27;58:3.3.1-3.3.25. doi: 10.1002/cpbi.29.