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plotcon
Function
Plot quality of conservation of a sequence alignment
Description
Displays a graphical representation of the similarity along a set of
aligned sequences.
The similarity is calculated by moving a window of a specified length
along the aligned sequences. Within the window, the similarity of any
one position is taken to be the average of all the possible pairwise
scores of the bases or residues at that position. The pairwise scores
are taken from the specified similarity matrix. The average of the
position similarities within the window is plotted.
The program is useful for determining where the quality of alignments
is good or bad.
The average similarity is calculated by:
Av. Sim. = sum( Mij*wi + Mji*wj )
-------------------
(Nseq*Wsize)*((Nseq-1)*Wsize)
sum - over column*window size
w - sequence weighting
M - matrix comparison table
i,j - with respect to residue i or j
Nseq - number of sequences in the alignment
Wsize - window size
This program is useful for gaining a qualitative insight into where
there are regions of conservation in a group of aligned sequences.
Note that you should only compare the results of two runs of plotcon
if you use the same window size in each. This is because the
'similarity score' units that are output are very sensitive to the
size of the window. A large window (e.g. 100) gives a nice, smooth
curve, and very low 'similarity score' units, whereas a small window
(e.g. 4) gives a very spikey, noisy plot with 'similarity score' units
of a round 1.00
Usage
Here is a sample session with plotcon
% plotcon -sformat msf globins.msf -graph cps
Plot quality of conservation of a sequence alignment
Window size [4]:
Created plotcon.ps
Go to the input files for this example
Go to the output files for this example
Command line arguments
Standard (Mandatory) qualifiers:
[-sequences] seqset File containing a sequence alignment
-winsize integer [4] Number of columns to average alignment
quality over. The larger this value is, the
smoother the plot will be. (Any integer
value)
-graph xygraph [$EMBOSS_GRAPHICS value, or x11] Graph type
(ps, hpgl, hp7470, hp7580, meta, cps, x11,
tekt, tek, none, data, xterm, png, gif)
Additional (Optional) qualifiers:
-scorefile matrix [EBLOSUM62 for protein, EDNAFULL for DNA]
This is the scoring matrix file used when
comparing sequences. By default it is the
file 'EBLOSUM62' (for proteins) or the file
'EDNAFULL' (for nucleic sequences). These
files are found in the 'data' directory of
the EMBOSS installation.
Advanced (Unprompted) qualifiers: (none)
Associated qualifiers:
"-sequences" 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
-sformat1 string Input sequence format
-sdbname1 string Database name
-sid1 string Entryname
-ufo1 string UFO features
-fformat1 string Features format
-fopenfile1 string Features file name
"-graph" associated qualifiers
-gprompt boolean Graph prompting
-gdesc string Graph description
-gtitle string Graph title
-gsubtitle string Graph subtitle
-gxtitle string Graph x axis title
-gytitle string Graph y axis title
-goutfile string Output file for non interactive displays
-gdirectory string Output directory
General qualifiers:
-auto boolean Turn off prompts
-stdout boolean Write standard output
-filter boolean Read standard input, write 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. 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
Input file format
plotcon reads a set of gapped, aligned sequences.
Input files for usage example
File: globins.msf
!!AA_MULTIPLE_ALIGNMENT 1.0
../data/globins.msf MSF: 164 Type: P 25/06/01 CompCheck: 4278 ..
Name: HBB_HUMAN Len: 164 Check: 6914 Weight: 0.61
Name: HBB_HORSE Len: 164 Check: 6007 Weight: 0.65
Name: HBA_HUMAN Len: 164 Check: 3921 Weight: 0.65
Name: HBA_HORSE Len: 164 Check: 4770 Weight: 0.83
Name: MYG_PHYCA Len: 164 Check: 7930 Weight: 1.00
Name: GLB5_PETMA Len: 164 Check: 1857 Weight: 0.91
Name: LGB2_LUPLU Len: 164 Check: 2879 Weight: 0.43
//
1 50
HBB_HUMAN ~~~~~~~~VHLTPEEKSAVTALWGKVN.VDEVGGEALGR.LLVVYPWTQR
HBB_HORSE ~~~~~~~~VQLSGEEKAAVLALWDKVN.EEEVGGEALGR.LLVVYPWTQR
HBA_HUMAN ~~~~~~~~~~~~~~VLSPADKTNVKAA.WGKVGAHAGEYGAEALERMFLS
HBA_HORSE ~~~~~~~~~~~~~~VLSAADKTNVKAA.WSKVGGHAGEYGAEALERMFLG
MYG_PHYCA ~~~~~~~VLSEGEWQLVLHVWAKVEAD.VAGHGQDILIR.LFKSHPETLE
GLB5_PETMA PIVDTGSVAPLSAAEKTKIRSAWAPVYSTYETSGVDILVKFFTSTPAAQE
LGB2_LUPLU ~~~~~~~~GALTESQAALVKSSWEEFNANIPKHTHRFFILVLEIAPAAKD
51 100
HBB_HUMAN FFESFGDLSTPDAVMGNPKVKAHGKKVLGAFSDGLAHLDNLKGTFATLSE
HBB_HORSE FFDSFGDLSNPGAVMGNPKVKAHGKKVLHSFGEGVHHLDNLKGTFAALSE
HBA_HUMAN FPTTKTYFPHFDLSHGSAQVKGHGKKVADALTNAVAHVDDMPNALSALSD
HBA_HORSE FPTTKTYFPHFDLSHGSAQVKAHGKKVGDALTLAVGHLDDLPGALSNLSD
MYG_PHYCA KFDRFKHLKTEAEMKASEDLKKHGVTVLTALGAILKKKGHHEAELKPLAQ
GLB5_PETMA FFPKFKGLTTADQLKKSADVRWHAERIINAVNDAVASMDDTEKMSMKLRD
LGB2_LUPLU LFSFLKGTSEVPQNNPELQAHAGKVFKLVYEAAIQLQVTGVVVTDATLKN
101 150
HBB_HUMAN LHCDKLH..VDPENFRLLGNVLVCVLAHHFGKEFTPPVQAAYQKVVAGVA
HBB_HORSE LHCDKLH..VDPENFRLLGNVLVVVLARHFGKDFTPELQASYQKVVAGVA
HBA_HUMAN LHAHKLR..VDPVNFKLLSHCLLVTLAAHLPAEFTPAVHASLDKFLASVS
HBA_HORSE LHAHKLR..VDPVNFKLLSHCLLSTLAVHLPNDFTPAVHASLDKFLSSVS
MYG_PHYCA SHATKHK..IPIKYLEFISEAIIHVLHSRHPGDFGADAQGAMNKALELFR
GLB5_PETMA LSGKHAK..SFQVDPQYFKVLAAVIADTVAAGDAGFEKLMSMICILLRSA
LGB2_LUPLU LGSVHVSKGVADAHFPVVKEAILKTIKEVVGAKWSEELNSAWTIAYDELA
151 164
HBB_HUMAN NALAHKYH~~~~~~
HBB_HORSE NALAHKYH~~~~~~
HBA_HUMAN TVLTSKYR~~~~~~
HBA_HORSE TVLTSKYR~~~~~~
MYG_PHYCA KDIAAKYKELGYQG
GLB5_PETMA Y~~~~~~~~~~~~~
LGB2_LUPLU IVIKKEMNDAA~~~
Output file format
A graph of the quality of the alignment is dispalyed on the specifed
graphics device.
Output files for usage example
Graphics File: plotcon.ps
[plotcon results]
Data files
It reads in the specified similarity matrix.
EMBOSS data files are distributed with the application and stored in
the standard EMBOSS data directory, which is defined by the EMBOSS
environment variable EMBOSS_DATA.
To see the available EMBOSS data files, run:
% embossdata -showall
To fetch one of the data files (for example 'Exxx.dat') into your
current directory for you to inspect or modify, run:
% embossdata -fetch -file Exxx.dat
Users can provide their own data files in their own directories.
Project specific files can be put in the current directory, or for
tidier directory listings in a subdirectory called ".embossdata".
Files for all EMBOSS runs can be put in the user's home directory, or
again in a subdirectory called ".embossdata".
The directories are searched in the following order:
* . (your current directory)
* .embossdata (under your current directory)
* ~/ (your home directory)
* ~/.embossdata
Notes
None.
References
None.
Warnings
If you give it a set of unaligned sequences, it will plot the (poor!)
quality of these as if they were aligned.
Diagnostic Error Messages
None.
Exit status
It always exits with status 0.
Known bugs
None.
See also
Program name Description
edialign Local multiple alignment of sequences
emma Multiple alignment program - interface to ClustalW program
infoalign Information on a multiple sequence alignment
prettyplot Displays aligned sequences, with colouring and boxing
showalign Displays a multiple sequence alignment
tranalign Align nucleic coding regions given the aligned proteins
Author(s)
Tim Carver (tcarver rfcgr.mrc.ac.uk)
MRC Rosalind Franklin Centre for Genomics Research Wellcome Trust
Genome Campus, Hinxton, Cambridge, CB10 1SB, UK
History
Written (Sept 2000) - Tim Carver.
Target users
This program is intended to be used by everyone and everything, from
naive users to embedded scripts.
Comments
None
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