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chaos |
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chaos creates a chaos game representation (CGR) plot for a nucleotide sequence. A CGR plot represents a nucleotide sequence as a square box with an A, G, C, or T nucleotide at each corner. The box contains dots, each one representing a dinucleotide. All overlapping dinucleotides from the start to the end of the sequence are plotted. Regions which are devoid of dots (or heavily covered with dots) indicate short sequence motifs that are unusually infrequent (or frequent). CGR plots depict base composition and sequentiality and is a unique visual representation of a sequence that complements more traditional linear representations.
The plot is generated as follows. A box is drawn and an A, G, C, or T is drawn at each corner. Starting from the middle, move half way to the corner of the box representing the first base in the sequence and draw a dot. Then for each subsequent base move half way to the corresponding box corner and draw a dot. Finally display the number and percentage values of AGCT bases. The result is an image of a square sprinkled with dots.
% chaos tembl:j01636 -graph cps Draw a chaos game representation plot for a nucleotide sequence Created chaos.ps |
Go to the input files for this example
Go to the output files for this example
Standard (Mandatory) qualifiers:
[-sequence] sequence Nucleotide sequence filename and optional
format, or reference (input USA)
-graph graph [$EMBOSS_GRAPHICS value, or x11] Graph type
(ps, hpgl, hp7470, hp7580, meta, cps, x11,
tekt, tek, none, data, das, xterm, png, gif)
Additional (Optional) qualifiers: (none)
Advanced (Unprompted) qualifiers: (none)
Associated qualifiers:
"-sequence" associated qualifiers
-sbegin1 integer Start of the sequence to be used
-send1 integer End of the 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 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. 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
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| Standard (Mandatory) qualifiers | Allowed values | Default | |
|---|---|---|---|
| [-sequence] (Parameter 1) |
Nucleotide sequence filename and optional format, or reference (input USA) | Readable sequence | Required |
| -graph | Graph type | EMBOSS has a list of known devices, including ps, hpgl, hp7470, hp7580, meta, cps, x11, tekt, tek, none, data, das, xterm, png, gif | EMBOSS_GRAPHICS value, or x11 |
| Additional (Optional) qualifiers | Allowed values | Default | |
| (none) | |||
| Advanced (Unprompted) qualifiers | Allowed values | Default | |
| (none) | |||
ID J01636; SV 1; linear; genomic DNA; STD; PRO; 7477 BP.
XX
AC J01636; J01637; K01483; K01793;
XX
DT 30-NOV-1990 (Rel. 26, Created)
DT 09-SEP-2004 (Rel. 81, Last updated, Version 8)
XX
DE E.coli lactose operon with lacI, lacZ, lacY and lacA genes.
XX
KW acetyltransferase; beta-D-galactosidase; galactosidase; lac operon;
KW lac repressor protein; lacA gene; lacI gene; lactose permease; lacY gene;
KW lacZ gene; mutagenesis; palindrome; promoter region;
KW thiogalactoside acetyltransferase.
XX
OS Escherichia coli
OC Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacteriales;
OC Enterobacteriaceae; Escherichia.
XX
RN [1]
RP 1243-1266
RX DOI; 10.1073/pnas.70.12.3581.
RX PUBMED; 4587255.
RA Gilbert W., Maxam A.;
RT "The nucleotide sequence of the lac operator";
RL Proc. Natl. Acad. Sci. U.S.A. 70(12):3581-3584(1973).
XX
RN [2]
RP 1246-1308
RX DOI; 10.1073/pnas.70.12.3585.
RX PUBMED; 4587256.
RA Maizels N.M.;
RT "The nucleotide sequence of the lactose messenger ribonucleic acid
RT transcribed from the UV5 promoter mutant of Escherichia coli";
RL Proc. Natl. Acad. Sci. U.S.A. 70(12):3585-3589(1973).
XX
RN [3]
RX PUBMED; 4598642.
RA Gilbert W., Maizels N., Maxam A.;
RT "Sequences of controlling regions of the lactose operon";
RL Cold Spring Harb. Symp. Quant. Biol. 38:845-855(1974).
XX
RN [4]
RA Gilbert W., Gralla J., Majors A.J., Maxam A.;
RT "Lactose operator sequences and the action of lac repressor";
RL (in) Sund H., Blauer G. (Eds.);
RL PROTEIN-LIGAND INTERACTIONS:193-207;
RL Walter de Gruyter, New York (1975)
XX
RN [5]
RP 1146-1282
[Part of this file has been deleted for brevity]
cgatttggct acatgacatc aaccatatca gcaaaagtga tacgggtatt atttttgccg 4560
ctatttctct gttctcgcta ttattccaac cgctgtttgg tctgctttct gacaaactcg 4620
ggctgcgcaa atacctgctg tggattatta ccggcatgtt agtgatgttt gcgccgttct 4680
ttatttttat cttcgggcca ctgttacaat acaacatttt agtaggatcg attgttggtg 4740
gtatttatct aggcttttgt tttaacgccg gtgcgccagc agtagaggca tttattgaga 4800
aagtcagccg tcgcagtaat ttcgaatttg gtcgcgcgcg gatgtttggc tgtgttggct 4860
gggcgctgtg tgcctcgatt gtcggcatca tgttcaccat caataatcag tttgttttct 4920
ggctgggctc tggctgtgca ctcatcctcg ccgttttact ctttttcgcc aaaacggatg 4980
cgccctcttc tgccacggtt gccaatgcgg taggtgccaa ccattcggca tttagcctta 5040
agctggcact ggaactgttc agacagccaa aactgtggtt tttgtcactg tatgttattg 5100
gcgtttcctg cacctacgat gtttttgacc aacagtttgc taatttcttt acttcgttct 5160
ttgctaccgg tgaacagggt acgcgggtat ttggctacgt aacgacaatg ggcgaattac 5220
ttaacgcctc gattatgttc tttgcgccac tgatcattaa tcgcatcggt gggaaaaacg 5280
ccctgctgct ggctggcact attatgtctg tacgtattat tggctcatcg ttcgccacct 5340
cagcgctgga agtggttatt ctgaaaacgc tgcatatgtt tgaagtaccg ttcctgctgg 5400
tgggctgctt taaatatatt accagccagt ttgaagtgcg tttttcagcg acgatttatc 5460
tggtctgttt ctgcttcttt aagcaactgg cgatgatttt tatgtctgta ctggcgggca 5520
atatgtatga aagcatcggt ttccagggcg cttatctggt gctgggtctg gtggcgctgg 5580
gcttcacctt aatttccgtg ttcacgctta gcggccccgg cccgctttcc ctgctgcgtc 5640
gtcaggtgaa tgaagtcgct taagcaatca atgtcggatg cggcgcgacg cttatccgac 5700
caacatatca taacggagtg atcgcattga acatgccaat gaccgaaaga ataagagcag 5760
gcaagctatt taccgatatg tgcgaaggct taccggaaaa aagacttcgt gggaaaacgt 5820
taatgtatga gtttaatcac tcgcatccat cagaagttga aaaaagagaa agcctgatta 5880
aagaaatgtt tgccacggta ggggaaaacg cctgggtaga accgcctgtc tatttctctt 5940
acggttccaa catccatata ggccgcaatt tttatgcaaa tttcaattta accattgtcg 6000
atgactacac ggtaacaatc ggtgataacg tactgattgc acccaacgtt actctttccg 6060
ttacgggaca ccctgtacac catgaattga gaaaaaacgg cgagatgtac tcttttccga 6120
taacgattgg caataacgtc tggatcggaa gtcatgtggt tattaatcca ggcgtcacca 6180
tcggggataa ttctgttatt ggcgcgggta gtatcgtcac aaaagacatt ccaccaaacg 6240
tcgtggcggc tggcgttcct tgtcgggtta ttcgcgaaat aaacgaccgg gataagcact 6300
attatttcaa agattataaa gttgaatcgt cagtttaaat tataaaaatt gcctgatacg 6360
ctgcgcttat caggcctaca agttcagcga tctacattag ccgcatccgg catgaacaaa 6420
gcgcaggaac aagcgtcgca tcatgcctct ttgacccaca gctgcggaaa acgtactggt 6480
gcaaaacgca gggttatgat catcagccca acgacgcaca gcgcatgaaa tgcccagtcc 6540
atcaggtaat tgccgctgat actacgcagc acgccagaaa accacggggc aagcccggcg 6600
atgataaaac cgattccctg cataaacgcc accagcttgc cagcaatagc cggttgcaca 6660
gagtgatcga gcgccagcag caaacagagc ggaaacgcgc cgcccagacc taacccacac 6720
accatcgccc acaataccgg caattgcatc ggcagccaga taaagccgca gaaccccacc 6780
agttgtaaca ccagcgccag cattaacagt ttgcgccgat cctgatggcg agccatagca 6840
ggcatcagca aagctcctgc ggcttgccca agcgtcatca atgccagtaa ggaaccgctg 6900
tactgcgcgc tggcaccaat ctcaatatag aaagcgggta accaggcaat caggctggcg 6960
taaccgccgt taatcagacc gaagtaaaca cccagcgtcc acgcgcgggg agtgaatacc 7020
acgcgaaccg gagtggttgt tgtcttgtgg gaagaggcga cctcgcgggc gctttgccac 7080
caccaggcaa agagcgcaac aacggcaggc agcgccacca ggcgagtgtt tgataccagg 7140
tttcgctatg ttgaactaac cagggcgtta tggcggcacc aagcccaccg ccgcccatca 7200
gagccgcgga ccacagcccc atcaccagtg gcgtgcgctg ctgaaaccgc cgtttaatca 7260
ccgaagcatc accgcctgaa tgatgccgat ccccacccca ccaagcagtg cgctgctaag 7320
cagcagcgca ctttgcgggt aaagctcacg catcaatgca ccgacggcaa tcagcaacag 7380
actgatggcg acactgcgac gttcgctgac atgctgatga agccagcttc cggccagcgc 7440
cagcccgccc atggtaacca ccggcagagc ggtcgac 7477
//
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![[chaos results]](chaos.1.chaos.gif)
A graphics image is produced.
Regions which are devoid of dots (or heavily covered with dots) indicate short sequence motifs that are unusually infrequent (or frequent). The sequence of such motifs can be deduced by looking to see which quarter of the square the region is in - the letter that this quarter belongs to is the first base of the motif. The quarter is then quartered again and the appropriate base letters are assigned to the corners of the quarter - the part that the region is in gives the second base of the motif.
The process continues until you have identified the 1/16th or 1/32nd, etc. of the original square containing the unusual region and you now have the sequence of the motif.
| Program name | Description |
|---|---|
| banana | Plot bending and curvature data for B-DNA |
| btwisted | Calculate the twisting in a B-DNA sequence |
| compseq | Calculate the composition of unique words in sequences |
| dan | Calculates nucleic acid melting temperature |
| density | Draw a nucleic acid density plot |
| freak | Generate residue/base frequency table or plot |
| isochore | Plots isochores in DNA sequences |
| sirna | Finds siRNA duplexes in mRNA |
| wordcount | Count and extract unique words in DNA sequence(s) |