trimseq



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Function

   Remove unwanted characters from start and end of sequence(s)

Description

   trimseq reads one or more sequences and writes the same sequences out,
   but removing any regions at the start and / or end that contain
   unwanted characters. These include gap characters (where occur the
   sequences have been aligned), X's and N's (in nucleotide sequences),
   *'s (optionally) and (optionally) IUPAC ambiguity codes.

Usage

   Here is a sample session with trimseq


% trimseq untrimmed.seq trim1.seq -window 1 -percent 100
Remove unwanted characters from start and end of sequence(s)


   Go to the input files for this example
   Go to the output files for this example

   Example 2


% trimseq untrimmed.seq trim2.seq -window 5 -percent 40
Remove unwanted characters from start and end of sequence(s)


   Go to the output files for this example

   Example 3


% trimseq untrimmed.seq trim3.seq -window 5 -percent 50
Remove unwanted characters from start and end of sequence(s)


   Go to the output files for this example

   Example 4


% trimseq untrimmed.seq trim4.seq -window 5 -percent 50 -strict
Remove unwanted characters from start and end of sequence(s)


   Go to the output files for this example

   Example 5


% trimseq untrimmed.seq trim5.seq -window 5 -percent 50 -strict -noright
Remove unwanted characters from start and end of sequence(s)


   Go to the output files for this example

Command line arguments

Remove unwanted characters from start and end of sequence(s)
Version: EMBOSS:6.6.0.0

   Standard (Mandatory) qualifiers:
  [-sequence]          seqall     (Gapped) sequence(s) filename and optional
                                  format, or reference (input USA)
  [-outseq]            seqoutall  [.] Sequence set(s)
                                  filename and optional format (output USA)

   Additional (Optional) qualifiers:
   -window             integer    [1] This determines the size of the region
                                  that is considered when deciding whether the
                                  percentage of ambiguity is greater than the
                                  threshold. A value of 5 means that a region
                                  of 5 letters in the sequence is shifted
                                  along the sequence from the ends and
                                  trimming is done only if there is a greater
                                  or equal percentage of ambiguity than the
                                  threshold percentage. (Integer 1 or more)
   -percent            float      [100.0] This is the threshold of the
                                  percentage ambiguity in the window required
                                  in order to trim a sequence. (Any numeric
                                  value)
   -strict             boolean    [N] In nucleic sequences, trim off not only
                                  N's and X's, but also the nucleotide IUPAC
                                  ambiguity codes M, R, W, S, Y, K, V, H, D
                                  and B. In protein sequences, trim off not
                                  only X's but also B and Z.
   -star               boolean    [N] In protein sequences, trim off not only
                                  X's, but also the *'s

   Advanced (Unprompted) qualifiers:
   -[no]left           boolean    [Y] Trim at the start
   -[no]right          boolean    [Y] Trim at the end

   Associated qualifiers:

   "-sequence" associated qualifiers
   -sbegin1            integer    Start of each sequence to be used
   -send1              integer    End of each sequence to be used
   -sreverse1          boolean    Reverse (if DNA)
   -sask1              boolean    Ask for begin/end/reverse
   -snucleotide1       boolean    Sequence is nucleotide
   -sprotein1          boolean    Sequence is protein
   -slower1            boolean    Make lower case
   -supper1            boolean    Make upper case
   -scircular1         boolean    Sequence is circular
   -squick1            boolean    Read id and sequence only
   -sformat1           string     Input sequence format
   -iquery1            string     Input query fields or ID list
   -ioffset1           integer    Input start position offset
   -sdbname1           string     Database name
   -sid1               string     Entryname
   -ufo1               string     UFO features
   -fformat1           string     Features format
   -fopenfile1         string     Features file name

   "-outseq" associated qualifiers
   -osformat2          string     Output seq format
   -osextension2       string     File name extension
   -osname2            string     Base file name
   -osdirectory2       string     Output directory
   -osdbname2          string     Database name to add
   -ossingle2          boolean    Separate file for each entry
   -oufo2              string     UFO features
   -offormat2          string     Features format
   -ofname2            string     Features file name
   -ofdirectory2       string     Output directory

   General qualifiers:
   -auto               boolean    Turn off prompts
   -stdout             boolean    Write first file to standard output
   -filter             boolean    Read first file from standard input, write
                                  first file to standard output
   -options            boolean    Prompt for standard and additional values
   -debug              boolean    Write debug output to program.dbg
   -verbose            boolean    Report some/full command line options
   -help               boolean    Report command line options and exit. More
                                  information on associated and general
                                  qualifiers can be found with -help -verbose
   -warning            boolean    Report warnings
   -error              boolean    Report errors
   -fatal              boolean    Report fatal errors
   -die                boolean    Report dying program messages
   -version            boolean    Report version number and exit


Input file format

   Normal sequence.

  Input files for usage example

  File: untrimmed.seq

>myseq
...ttyyyctttctcgactccatcttcgcggtagctgggaccgccgttcagtcgccaatatgc
agctctttgtccgcgcccaggagctacacaccttcgaggtgaccggccaggaaacggtcg
cccagatcaaggctcatgtagcctcactggagggcattgccccggaagatcaagtcgtgc
tcctggcaggcgcgcccctggaggatgaggccactctgggccagtgcggggtggaggccc
tgactaccctggaagtagcaggccgcatgcttggaggtaaagttcatggttccctggccc
gtgctggaaaagtgagaggtcagactcctaaggtggccaaacaggagaagaagaagaaga
agacaggtcgggctaagcggcggatgcagtacaaccggcgctttgtcaacgttgtgccca
cctttggcaagaagaagggccccaatgccaactcttaagtcttttgtaattctggctttc
tctaataaaaaagccacttagttca.gnntcynnnnnn

Output file format

   Normal sequence file.

  Output files for usage example

  File: trim1.seq

>myseq
ttyyyctttctcgactccatcttcgcggtagctgggaccgccgttcagtcgccaatatgc
agctctttgtccgcgcccaggagctacacaccttcgaggtgaccggccaggaaacggtcg
cccagatcaaggctcatgtagcctcactggagggcattgccccggaagatcaagtcgtgc
tcctggcaggcgcgcccctggaggatgaggccactctgggccagtgcggggtggaggccc
tgactaccctggaagtagcaggccgcatgcttggaggtaaagttcatggttccctggccc
gtgctggaaaagtgagaggtcagactcctaaggtggccaaacaggagaagaagaagaaga
agacaggtcgggctaagcggcggatgcagtacaaccggcgctttgtcaacgttgtgccca
cctttggcaagaagaagggccccaatgccaactcttaagtcttttgtaattctggctttc
tctaataaaaaagccacttagttca-gnntcy

  Output files for usage example 2

  File: trim2.seq

>myseq
ttyyyctttctcgactccatcttcgcggtagctgggaccgccgttcagtcgccaatatgc
agctctttgtccgcgcccaggagctacacaccttcgaggtgaccggccaggaaacggtcg
cccagatcaaggctcatgtagcctcactggagggcattgccccggaagatcaagtcgtgc
tcctggcaggcgcgcccctggaggatgaggccactctgggccagtgcggggtggaggccc
tgactaccctggaagtagcaggccgcatgcttggaggtaaagttcatggttccctggccc
gtgctggaaaagtgagaggtcagactcctaaggtggccaaacaggagaagaagaagaaga
agacaggtcgggctaagcggcggatgcagtacaaccggcgctttgtcaacgttgtgccca
cctttggcaagaagaagggccccaatgccaactcttaagtcttttgtaattctggctttc
tctaataaaaaagccacttagttca-g

  Output files for usage example 3

  File: trim3.seq

>myseq
ttyyyctttctcgactccatcttcgcggtagctgggaccgccgttcagtcgccaatatgc
agctctttgtccgcgcccaggagctacacaccttcgaggtgaccggccaggaaacggtcg
cccagatcaaggctcatgtagcctcactggagggcattgccccggaagatcaagtcgtgc
tcctggcaggcgcgcccctggaggatgaggccactctgggccagtgcggggtggaggccc
tgactaccctggaagtagcaggccgcatgcttggaggtaaagttcatggttccctggccc
gtgctggaaaagtgagaggtcagactcctaaggtggccaaacaggagaagaagaagaaga
agacaggtcgggctaagcggcggatgcagtacaaccggcgctttgtcaacgttgtgccca
cctttggcaagaagaagggccccaatgccaactcttaagtcttttgtaattctggctttc
tctaataaaaaagccacttagttca-gnntcy

  Output files for usage example 4

  File: trim4.seq

>myseq
ctttctcgactccatcttcgcggtagctgggaccgccgttcagtcgccaatatgcagctc
tttgtccgcgcccaggagctacacaccttcgaggtgaccggccaggaaacggtcgcccag
atcaaggctcatgtagcctcactggagggcattgccccggaagatcaagtcgtgctcctg
gcaggcgcgcccctggaggatgaggccactctgggccagtgcggggtggaggccctgact
accctggaagtagcaggccgcatgcttggaggtaaagttcatggttccctggcccgtgct
ggaaaagtgagaggtcagactcctaaggtggccaaacaggagaagaagaagaagaagaca
ggtcgggctaagcggcggatgcagtacaaccggcgctttgtcaacgttgtgcccaccttt
ggcaagaagaagggccccaatgccaactcttaagtcttttgtaattctggctttctctaa
taaaaaagccacttagttca-gnntc

  Output files for usage example 5

  File: trim5.seq

>myseq
ctttctcgactccatcttcgcggtagctgggaccgccgttcagtcgccaatatgcagctc
tttgtccgcgcccaggagctacacaccttcgaggtgaccggccaggaaacggtcgcccag
atcaaggctcatgtagcctcactggagggcattgccccggaagatcaagtcgtgctcctg
gcaggcgcgcccctggaggatgaggccactctgggccagtgcggggtggaggccctgact
accctggaagtagcaggccgcatgcttggaggtaaagttcatggttccctggcccgtgct
ggaaaagtgagaggtcagactcctaaggtggccaaacaggagaagaagaagaagaagaca
ggtcgggctaagcggcggatgcagtacaaccggcgctttgtcaacgttgtgcccaccttt
ggcaagaagaagggccccaatgccaactcttaagtcttttgtaattctggctttctctaa
taaaaaagccacttagttca-gnntcynnnnnn

Data files

   None.

Notes

   trimseq will remove from a terminal region:
     * all gap characters
     * X's and N's (in nucleic sequences)
     * *'s (optional)
     * IUPAC ambiguity codes: B and Z in proteins, M,R,W,S,Y,K,V,H,D and B
       in nucleic sequences (optional)

   Rather than removing individual characters, it removes an entire
   segment, using a threshold percentage of unwanted characters in a
   window of a specified size which is moved along the sequence from the
   ends. The program stops trimming when the percentage of unwanted
   characters in the moving window drops below the specified threshold
   percentage.

   Thus if the window size is set to 1 and the percentage threshold is
   100, no further poor quality regions will be removed. If the window
   size is set to 5 and the percentage threshold is 40 then the sequence
   AAGCTNNNNATT will be trimmed to AAGCT, while AAGCTNATT or AAGCTNNNNATTT
   will not be trimmed as less than 40% of the last 5 characters are N's.

   After trimming these poor quality regions, it will again then trim off
   any dangling gap characters from the ends.

References

   None.

Warnings

   None.

Diagnostic Error Messages

   None.

Exit status

   It always exits with status 0.

Known bugs

   None noted.

See also

   Program name     Description
   aligncopy        Read and write alignments
   aligncopypair    Read and write pairs from alignments
   biosed           Replace or delete sequence sections
   codcopy          Copy and reformat a codon usage table
   cutseq           Remove a section from a sequence
   degapseq         Remove non-alphabetic (e.g. gap) characters from sequences
   descseq          Alter the name or description of a sequence
   entret           Retrieve sequence entries from flatfile databases and files
   extractalign     Extract regions from a sequence alignment
   extractfeat      Extract features from sequence(s)
   extractseq       Extract regions from a sequence
   featcopy         Read and write a feature table
   featmerge        Merge two overlapping feature tables
   featreport       Read and write a feature table
   feattext         Return a feature table original text
   listor           Write a list file of the logical OR of two sets of sequences
   makenucseq       Create random nucleotide sequences
   makeprotseq      Create random protein sequences
   maskambignuc     Mask all ambiguity characters in nucleotide sequences with
                    N
   maskambigprot    Mask all ambiguity characters in protein sequences with X
   maskfeat         Write a sequence with masked features
   maskseq          Write a sequence with masked regions
   newseq           Create a sequence file from a typed-in sequence
   nohtml           Remove mark-up (e.g. HTML tags) from an ASCII text file
   noreturn         Remove carriage return from ASCII files
   nospace          Remove whitespace from an ASCII text file
   notab            Replace tabs with spaces in an ASCII text file
   notseq           Write to file a subset of an input stream of sequences
   nthseq           Write to file a single sequence from an input stream of
                    sequences
   nthseqset        Read and write (return) one set of sequences from many
   pasteseq         Insert one sequence into another
   revseq           Reverse and complement a nucleotide sequence
   seqcount         Read and count sequences
   seqret           Read and write (return) sequences
   seqretsetall     Read and write (return) many sets of sequences
   seqretsplit      Read sequences and write them to individual files
   sizeseq          Sort sequences by size
   skipredundant    Remove redundant sequences from an input set
   skipseq          Read and write (return) sequences, skipping first few
   splitsource      Split sequence(s) into original source sequences
   splitter         Split sequence(s) into smaller sequences
   trimest          Remove poly-A tails from nucleotide sequences
   trimspace        Remove extra whitespace from an ASCII text file
   union            Concatenate multiple sequences into a single sequence
   vectorstrip      Remove vectors from the ends of nucleotide sequence(s)
   yank             Add a sequence reference (a full USA) to a list file

Author(s)

   Gary Williams formerly at:
   MRC Rosalind Franklin Centre for Genomics Research Wellcome Trust
   Genome Campus, Hinxton, Cambridge, CB10 1SB, UK

   Please report all bugs to the EMBOSS bug team
   (emboss-bug (c) emboss.open-bio.org) not to the original author.

History

Target users

   This program is intended to be used by everyone and everything, from
   naive users to embedded scripts.

Comments

   None