Class | Bio::Blast
In: | lib/bio/appl/bl2seq/report.rb lib/bio/appl/blast.rb lib/bio/appl/blast/format0.rb lib/bio/appl/blast/format8.rb lib/bio/appl/blast/ncbioptions.rb lib/bio/appl/blast/remote.rb lib/bio/appl/blast/report.rb lib/bio/appl/blast/rexml.rb lib/bio/appl/blast/rpsblast.rb lib/bio/appl/blast/wublast.rb lib/bio/appl/blast/xmlparser.rb lib/bio/io/fastacmd.rb
Parent: | Object

## Description

The Bio::Blast class contains methods for running local or remote BLAST searches, as well as for parsing of the output of such BLASTs (i.e. the BLAST reports). For more information on similarity searches and the BLAST program, see www.ncbi.nlm.nih.gov/Education/BLASTinfo/similarity.html.

## Usage

      require 'bio'

      # To run an actual BLAST analysis:
      #   1. create a BLAST factory
      remote_blast_factory = Bio::Blast.remote('blastp', 'swissprot',
                                               '-e 0.0001', 'genomenet')
      #or:
      local_blast_factory = Bio::Blast.local('blastn','/path/to/db')

      #   2. run the actual BLAST by querying the factory
      report = remote_blast_factory.query(sequence_text)

      # Then, to parse the report, see Bio::Blast::Report

## See also

- Bio::Blast::Report
- Bio::Blast::Report::Hit
- Bio::Blast::Report::Hsp

## References

- www.ncbi.nlm.nih.gov/blast/
- www.ncbi.nlm.nih.gov/Education/BLASTinfo/similarity.html
- blast.genome.jp/ideas/ideas.html#blast

### Methods

local new option option= options= query remote reports reports_xml server=

### Classes and Modules

Module Bio::Blast::RPSBlast
Module Bio::Blast::Remote
Class Bio::Blast::Bl2seq
Class Bio::Blast::Fastacmd
Class Bio::Blast::NCBIOptions
Class Bio::Blast::Report
Class Bio::Blast::Report_tab

### Attributes

blastall | [RW] | Full path for blastall. (default: ‘blastall’).
db | [RW] | Database name (_-d_ option for blastall)
filter | [RW] | Filter option for blastall -F (T or F).
format | [RW] | Output report format for blastall -m 0, pairwise; 1; 2; 3; 4; 5; 6; 7, XML Blast outpu;, 8, tabular; 9, tabular with comment lines; 10, ASN text; 11, ASN binery [intege].
matrix | [RW] | Substitution matrix for blastall -M
options | [R] | Options for blastall
output | [R] | Returns a String containing blast execution output in as is the Bio::Blast#format.
parser | [W] |
program | [RW] | Program name (_-p_ option for blastall): blastp, blastn, blastx, tblastn or tblastx
server | [R] | Server to submit the BLASTs to

### Public Class methods

local(program, db, options = '', blastall = nil)

This is a shortcut for Bio::Blast.new:

     Bio::Blast.local(program, database, options)

is equivalent to

     Bio::Blast.new(program, database, options, 'local')

Arguments:

- program (required): ‘blastn’, ‘blastp’, ‘blastx’, ‘tblastn’ or ‘tblastx‘
- db (required): name of the local database
- options: blastall options # (see www.genome.jp/dbget-bin/show_man?blast2)
- blastall: full path to blastall program (e.g. "/opt/bin/blastall"; DEFAULT: "blastall")

Returns: | Bio::Blast factory object

[Source]

        # File lib/bio/appl/blast.rb, line 79
    79:     def self.local(program, db, options = '', blastall = nil)
    80:       f = self.new(program, db, options, 'local')
    81:       if blastall then
    82:         f.blastall = blastall
    83:       end
    84:       f
    85:     end

new(program, db, opt = [], server = 'local')

Creates a Bio::Blast factory object.

To run any BLAST searches, a factory has to be created that describes a certain BLAST pipeline: the program to use, the database to search, any options and the server to use. E.g.

      blast_factory = Bio::Blast.new('blastn','dbsts', '-e 0.0001 -r 4', 'genomenet')

Arguments:

- program (required): ‘blastn’, ‘blastp’, ‘blastx’, ‘tblastn’ or ‘tblastx‘
- db (required): name of the (local or remote) database
- options: blastall options # (see www.genome.jp/dbget-bin/show_man?blast2)
- server: server to use (e.g. ‘genomenet’; DEFAULT = ‘local’)

Returns: | Bio::Blast factory object

[Source]

         # File lib/bio/appl/blast.rb, line 317
    317:     def initialize(program, db, opt = [], server = 'local')
    318:       @program  = program
    319:       @db       = db
    320:
    321:       @blastall = 'blastall'
    322:       @matrix   = nil
    323:       @filter   = nil
    324:
    325:       @output   = ''
    326:       @parser   = nil
    327:       @format   = nil
    328:
    329:       @options = set_options(opt, program, db)
    330:       self.server = server
    331:     end

remote(program, db, option = '', server = 'genomenet')

Bio::Blast.remote does exactly the same as Bio::Blast.new, but sets the remote server ‘genomenet’ as its default.

Arguments:

- program (required): ‘blastn’, ‘blastp’, ‘blastx’, ‘tblastn’ or ‘tblastx‘
- db (required): name of the remote database
- options: blastall options # (see www.genome.jp/dbget-bin/show_man?blast2)
- server: server to use (DEFAULT = ‘genomenet’)

Returns: | Bio::Blast factory object

[Source]

        # File lib/bio/appl/blast.rb, line 97
    97:     def self.remote(program, db, option = '', server = 'genomenet')
    98:       self.new(program, db, option, server)
    99:     end

reports(input, parser = nil) {|e| ...}

Bio::Blast.report parses given data, and returns an array of report (Bio::Blast::Report or Bio::Blast::Default::Report) objects, or yields each report object when a block is given.

Supported formats: NCBI default (-m 0), XML (-m 7), tabular (-m 8).

Arguments:

- input (required): input data
- parser: type of parser. see Bio::Blast::Report.new

Returns: | Undefiend when a block is given. Otherwise, an Array containing report (Bio::Blast::Report or Bio::Blast::Default::Report) objects.

[Source]

         # File lib/bio/appl/blast.rb, line 114
    114:     def self.reports(input, parser = nil)
    115:       begin
    116:         istr = input.to_str
    117:       rescue NoMethodError
    118:         istr = nil
    119:       end
    120:       if istr then
    121:         input = StringIO.new(istr)
    122:       end
    123:       raise 'unsupported input data type' unless input.respond_to?(:gets)
    124:
    125:       # if proper parser is given, emulates old behavior.
    126:       case parser
    127:       when :xmlparser, :rexml
    128:         ff = Bio::FlatFile.new(Bio::Blast::Report, input)
    129:         if block_given? then
    130:           ff.each do |e|
    131:             yield e
    132:           end
    133:           return []
    134:         else
    135:           return ff.to_a
    136:         end
    137:       when :tab
    138:         istr = input.read unless istr
    139:         rep = Report.new(istr, parser)
    140:         if block_given? then
    141:           yield rep
    142:           return []
    143:         else
    144:           return [ rep ]
    145:         end
    146:       end
    147:
    148:       # preparation of the new format autodetection rule if needed
    149:       if !defined?(@@reports_format_autodetection_rule) or
    150:           !@@reports_format_autodetection_rule then
    151:         regrule = Bio::FlatFile::AutoDetect::RuleRegexp
    152:         blastxml = regrule[ 'Bio::Blast::Report',
    153:                             /\<\!DOCTYPE BlastOutput PUBLIC / ]
    154:         blast    = regrule[ 'Bio::Blast::Default::Report',
    155:                             /^BLAST.? +[\-\.\w]+ +\[[\-\.\w ]+\]/ ]
    156:         tblast   = regrule[ 'Bio::Blast::Default::Report_TBlast',
    157:                             /^TBLAST.? +[\-\.\w]+ +\[[\-\.\w ]+\]/ ]
    158:         tab      = regrule[ 'Bio::Blast::Report_tab',
    159:                             /^([^\t]*\t){11}[^\t]*$/ ]
    160:         auto = Bio::FlatFile::AutoDetect[ blastxml,
    161:                                           blast,
    162:                                           tblast,
    163:                                           tab
    164:                                         ]
    165:         # sets priorities
    166:         blastxml.is_prior_to blast
    167:         blast.is_prior_to tblast
    168:         tblast.is_prior_to tab
    169:         # rehash
    170:         auto.rehash
    171:         @@report_format_autodetection_rule = auto
    172:       end
    173:
    174:       # Creates a FlatFile object with dummy class
    175:       ff = Bio::FlatFile.new(Object, input)
    176:       ff.dbclass = nil
    177:
    178:       # file format autodetection
    179:       3.times do
    180:         break if ff.eof? or
    181:           ff.autodetect(31, @@report_format_autodetection_rule)
    182:       end
    183:       # If format detection failed, assumed to be tabular (-m 8)
    184:       ff.dbclass = Bio::Blast::Report_tab unless ff.dbclass
    185:
    186:       if block_given? then
    187:         ff.each do |entry|
    188:           yield entry
    189:         end
    190:         ret = []
    191:       else
    192:         ret = ff.to_a
    193:       end
    194:       ret
    195:     end

reports_xml(input, parser = nil) {|r| ...}

Note that this is the old implementation of Bio::Blast.reports. The aim of this method is keeping compatibility for older BLAST XML documents which might not be parsed by the new Bio::Blast.reports nor Bio::FlatFile. (Though we are not sure whether such documents exist or not.)

Bio::Blast.reports_xml parses given data, and returns an array of Bio::Blast::Report objects, or yields each Bio::Blast::Report object when a block is given.

It can be used only for XML format. For default (-m 0) format, consider using Bio::FlatFile, or Bio::Blast.reports.

Arguments:

- input (required): input data
- parser: type of parser. see Bio::Blast::Report.new

Returns: | Undefiend when a block is given. Otherwise, an Array containing Bio::Blast::Report objects.

[Source]

         # File lib/bio/appl/blast.rb, line 220
    220:     def self.reports_xml(input, parser = nil)
    221:       ary = []
    222:       input.each_line("</BlastOutput>\n") do |xml|
    223:         xml.sub!(/[^<]*(<?)/, '\1') # skip before <?xml> tag
    224:         next if xml.empty?          # skip trailing no hits
    225:         rep = Report.new(xml, parser)
    226:         if rep.reports then
    227:           if block_given?
    228:             rep.reports.each { |r| yield r }
    229:           else
    230:             ary.concat rep.reports
    231:           end
    232:         else
    233:           if block_given?
    234:             yield rep
    235:           else
    236:             ary.push rep
    237:           end
    238:         end
    239:       end
    240:       return ary
    241:     end

### Public Instance methods

option()

Returns options of blastall

[Source]

         # File lib/bio/appl/blast.rb, line 374
    374:     def option
    375:       # backward compatibility
    376:       Bio::Command.make_command_line(options)
    377:     end

option=(str)

Set options for blastall

[Source]

         # File lib/bio/appl/blast.rb, line 380
    380:     def option=(str)
    381:       # backward compatibility
    382:       self.options = Shellwords.shellwords(str)
    383:     end

options=(ary)

Sets options for blastall

[Source]

         # File lib/bio/appl/blast.rb, line 255
    255:     def options=(ary)
    256:       @options = set_options(ary)
    257:     end

query(query)

This method submits a sequence to a BLAST factory, which performs the actual BLAST.

      # example 1
      seq = Bio::Sequence::NA.new('agggcattgccccggaagatcaagtcgtgctcctg')
      report = blast_factory.query(seq)

      # example 2
      str <<END_OF_FASTA
      >lcl|MySequence
      MPPSAISKISNSTTPQVQSSSAPNLTMLEGKGISVEKSFRVYSEEENQNQHKAKDSLGF
      KELEKDAIKNSKQDKKDHKNWLETLYDQAEQKWLQEPKKKLQDLIKNSGDNSRVILKDS
      END_OF_FASTA
      report = blast_factory.query(str)

Bug note: When multi-FASTA is given and the format is 7 (XML) or 8 (tab), it should return an array of Bio::Blast::Report objects, but it returns a single Bio::Blast::Report object. This is a known bug and should be fixed in the future.

Arguments:

- query (required): single- or multiple-FASTA formatted sequence(s)

Returns: | a Bio::Blast::Report (or Bio::Blast::Default::Report) object when single query is given. When multiple sequences are given as the query, it returns an array of Bio::Blast::Report (or Bio::Blast::Default::Report) objects. If it can not parse result, nil will be returnd.

[Source]

         # File lib/bio/appl/blast.rb, line 358
    358:     def query(query)
    359:       case query
    360:       when Bio::Sequence
    361:         query = query.output(:fasta)
    362:       when Bio::Sequence::NA, Bio::Sequence::AA, Bio::Sequence::Generic
    363:         query = query.to_fasta('query', 70)
    364:       else
    365:         query = query.to_s
    366:       end
    367:
    368:       @output = self.__send__("exec_#{@server}", query)
    369:       report = parse_result(@output)
    370:       return report
    371:     end

server=(str)

Sets server to submit the BLASTs to. The exec_xxxx method should be defined in Bio::Blast or Bio::Blast::Remote::Xxxx class.

[Source]

         # File lib/bio/appl/blast.rb, line 265
    265:     def server=(str)
    266:       @server = str
    267:       begin
    268:         m = Bio::Blast::Remote.const_get(@server.capitalize)
    269:       rescue NameError
    270:         m = nil
    271:       end
    272:       if m and !(self.is_a?(m)) then
    273:         # lazy include Bio::Blast::Remote::XXX module
    274:         self.class.class_eval { include m }
    275:       end
    276:       return @server
    277:     end

[Validate]