( TUTORIAL. (July 2006)
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1 ( TUTORIAL (July 2006)
2 CAIcal manual 2 Table of contents Introduction... 3 Required inputs... 5 SECTION A Calculation of parameters... 8 SECTION B CAI calculation for FASTA sequences. o B1. CAI calculation o B2. Expected CAI SECTION C CAI calculation for protein alignment. o C1. Using one reference table o C2. Using one reference table for each sequence. 23 Automation of some of the calculations References... 26
3 CAIcal manual 3 Introduction WHAT IS CAICAL? CAIcal is a web server, freely available at that performs several computations in relation to codon usage and the codon adaptation of DNA or RNA sequences to host organisms. OPTIONS AVAILABLE CAIcal has three main options: a) Calculation of parameters. This initial option provides basic calculations such as nucleotide composition, codon usage, codon usage per thousand and relative synonymous codon usage (RSCU) (see section A of this guide). b) CAI calculation for FASTA sequences. This section has two options: 1) CAI calculation for DNA or RNA sequences introduced and 2) calculation of an expected CAI value determined by randomly generating sequences (see section B of this guide). c) CAI calculation for protein alignment translated to DNA alignment. This option provides the use of: 1) one reference codon usage table for all of the sequences or 2) one reference table for each sequence introduced (see section C of this guide).
4 CAIcal manual 4 We have also developed this Tutorial, a Frequently Asked Questions section and several examples, which are available from the home page of the server. These helpful options will be periodically updated.
5 CAIcal manual 5 Required inputs INPUT REQUIREMENTS The server first checks whether the query sequences are a DNA or a RNA region. The table below is a summary of the input requirements for each section of CAIcal. Input Gene parameters CAI calculation CAI Expected CAI CAI calculation of alignment One reference table Multiple reference tables DNA or RNA sequences in FASTA format One codon usage reference table for all sequences One codon usage reference table for each sequence Protein alignment Genetic code selection Upper confidence limit option Nucleotide composition and codon usage calculation options (1: required; 0: not required) FORMAT OF THE REFERENCE SET An easy way to introduce the codon usage reference table in CAIcal is to copy and paste the codon usage tables from Codon Usage Database (Nakamura et al., 2000). We have therefore added a link to this database in the left frame of the server. The codon usage table from the Codon Usage Database format allowed in CAIcal is as follows: Fields: [triplet] [frequency: per thousand] ([number])... Example: UUU 17.4(586747) UCU 15.0(507382) UAU 12.1(408578) UGU 10.5(352664) UUC 20.4(687969) UCC 17.7(596425) UAC 15.3(516505) UGC 12.6(426761) UUA 7.5(254407) UCA 12.1(409879) UAA 1.1( 35822) UGA 1.6( 55514) UUG 12.8(432797) UCG 4.5(150335) UAG 0.8( 27554) UGG 13.3(447152)
6 CAIcal manual 6 CUU 13.1(440882) CCU 17.5(589809) CAU 10.8(363555) CGU 4.6(155426) CUC 19.7(664417) CCC 20.0(675558) CAC 15.1(509431) CGC 10.6(357380) CUA 7.1(240672) CCA 16.9(569871) CAA 12.1(408697) CGA 6.2(208816) CUG 39.9( ) CCG 7.0(237033) CAG 34.3( ) CGG 11.6(390529) AUU 15.8(532975) ACU 13.0(438753) AAU 16.7(563795) AGU 12.1(408481) AUC 20.9(705646) ACC 19.0(641707) AAC 19.0(642797) AGC 19.5(656528) AUA 7.4(249300) ACA 15.0(504527) AAA 24.1(812474) AGA 11.9(402225) AUG 22.0(744022) ACG 6.1(205470) AAG 32.0( ) AGG 11.9(402146) GUU 11.0(370035) GCU 18.5(624602) GAU 21.7(732533) GGU 10.8(364282) GUC 14.6(491325) GCC 28.1(947810) GAC 25.2(850343) GGC 22.5(758251) GUA 7.1(238697) GCA 15.9(537665) GAA 28.6(964323) GGA 16.4(553492) GUG 28.3(956245) GCG 7.5(253270) GAG 39.7( ) GGG 16.6(558612) We have also introduced another format as follows: Example: Fields: [triplet] ([number])... TTT (171) TCT (147) TAT (124) TGT (99) TTC (203) TCC (172) TAC (158) TGC (119) TTA (73) TCA (118) TAA (0) TGA (0) TTG (125) TCG (45) TAG (0) TGG (122) CTT (127) CCT (175) CAT (104) CGT (47) CTC (187) CCC (197) CAC (147) CGC (107) CTA (69) CCA (170) CAA (121) CGA (63) CTG (392) CCG (69) CAG (343) CGG (115) ATT (165) ACT (131) AAT (174) AGT (121) ATC (218) ACC (192) AAC (199) AGC (191) ATA (71) ACA (150) AAA (248) AGA (113) ATG (221) ACG (63) AAG (331) AGG (110) GTT (111) GCT (185) GAT (230) GGT (112) GTC (146) GCC (282) GAC (262) GGC (230) GTA (72) GCA (160) GAA (301) GGA (168) GTG (288) GCG (74) GAG (404) GGG (160) The section that requires more than one codon usage database in the same text box need sequence identification: [name of sequence]. Example: [name_sequence_1] TTT (171) TCT (147) TAT (124) TGT (99) TTC (203) TCC (172) TAC (158) TGC (119) TTA (73) TCA (118) TAA (0) TGA (0) TTG (125) TCG (45) TAG (0) TGG (122) CTT (127) CCT (175) CAT (104) CGT (47) CTC (187) CCC (197) CAC (147) CGC (107) CTA (69) CCA (170) CAA (121) CGA (63) CTG (392) CCG (69) CAG (343) CGG (115) ATT (165) ACT (131) AAT (174) AGT (121) ATC (218) ACC (192) AAC (199) AGC (191) ATA (71) ACA (150) AAA (248) AGA (113) ATG (221) ACG (63) AAG (331) AGG (110) GTT (111) GCT (185) GAT (230) GGT (112) GTC (146) GCC (282) GAC (262) GGC (230) GTA (72) GCA (160) GAA (301) GGA (168) GTG (288) GCG (74) GAG (404) GGG (160) [name_sequence_2] TTT (171) TCT (147) TAT (124) TGT (99) TTC (203) TCC (172) TAC (158) TGC (119) TTA (73) TCA (118) TAA (0) TGA (0) TTG (125) TCG (45) TAG (0) TGG (122) CTT (127) CCT (175) CAT (104) CGT (47) CTC (187) CCC (197) CAC (147) CGC (107) CTA (69) CCA (170) CAA (121) CGA (63) CTG (392) CCG (69) CAG (343) CGG (115) ATT (165) ACT (131) AAT (174) AGT (121) ATC (218) ACC (192) AAC (199) AGC (191) ATA (71) ACA (150) AAA (248) AGA (113) ATG (221) ACG (63) AAG (331) AGG (110) GTT (111) GCT (185) GAT (230) GGT (112) GTC (146) GCC (282) GAC (262) GGC (230)
7 CAIcal manual 7 GTA (72) GCA (160) GAA (301) GGA (168) GTG (288) GCG (74) GAG (404) GGG (160) ERROR AND WARNING MESSAGES The table below is a brief summary of the main errors and warning of CAIcal. Option No sequences are introduced No reference table is introduced Sequence is not divisible by three Sequence with more than one stop codon No parameters are checked DNA sequence introduced does not correspond to protein sequence from the alignment. Sequence too long (>10000 nt) Genes Parameters CAI calculation CAI Expected CAI CAI calculation of alignment One reference table Multiple reference tables E E E E E E E E E E E E E E E W W W W W E E E E E E E E (E: error; W: warning)
8 CAIcal manual 8 SECTION A Calculation of Parameters OVERVIEW Use this option to calculate nucleotide composition, codon usage, codon usage per thousand and/or relative synonymous codon usage (RSCU) from DNA sequences. INPUTS This section requires three steps: 1) Introduction of DNA or RNA sequences in FASTA format in a text box. 2) Choose the genetic code corresponding to the sequences introduced. If the genetic code is not choose appropriately, it can generate some error messages.
9 CAIcal manual 9 3) Finally, choose at least one of the four outputs available and click on the submit button. OUTPUTS This section has four outputs: Nucleotide composition. Codon usage.
10 CAIcal manual 10 Codon usage per thousand. Relative Synonymous Codon Usage. This section includes an output in tab-delimited format for each calculation. This output can be used to copy and paste into other applications.
11 CAIcal manual 11 SECTION B - CAI calculation for FASTA sequences B1. CAI calculation OVERVIEW Use this option to calculate the Codon Adaptation Index (CAI) for introduced sequences using one or two codon usage reference tables as a reference set. INPUTS This section requires four steps: 1) Introduction DNA or RNA sequences in FASTA format in a text box. 2) Insert one or two codon usage reference tables. These reference tables can be obtained from codon usage databases or created by the user.
12 CAIcal manual 12 3) Choose the genetic code corresponding to the sequences introduced. Choosing an unsuitable genetic code may generate errors messages. 4) 5) Click on the submit button. OUTPUTS The first output in this section are gene parameters such as CAI (Sharp and Li 1987) (CAI-1 and CAI-2 correspond to adaptation to codon usage reference tables 1 and 2 respectively), the effective number of codons (Nc) (Wright
13 CAIcal manual ) or G+C percentage. Additionally there is an output in tab delimited format. This output can be used to copy and paste into other applications. This output provides a graphically visualization of the weight of each codon along a DNA sequence. The window size and length can be defined by the user. If the user has pasted two reference tables, the values for reference tables 1 and 2 are represented in yellow and blue bars, respectively. The values used to represent each figure are also included in a text box in tab-delimited format. The graphical representation includes a table with the weight of each codon.
14 CAIcal manual 14 Another option is the calculation of the upper tolerance limit for the sequences introduced at 90%, 95% or 99% levels of confidence (see section B2 calculation of expected CAI). B2. Expected CAI OVERVIEW Use this option to calculate an expected CAI value determined by randomly generating 500 sequences with the same G+C content and amino acid composition as the query sequence.
15 CAIcal manual 15 INPUTS 1) Introduce DNA or RNA sequences in FASTA format in the text box. These sequences will be used in this section as a reference to create 500 random sequences. 2) Insert the codon usage reference tables. These reference tables can be obtained from codon usage databases or created by the user.
16 CAIcal manual 16 3) Choose the upper confidence limit at 90%, 95% or 99%, the Markov or Poisson Method and the appropriate genetic code and click on the accept button. OUTPUTS There are two outputs in this section. The first of these is related to the parameters used to create random sequences and the second output is the expected CAI calculated. 1) Reference parameters from the introduced sequences, i.e. G+C percentage and amino acid composition
17 CAIcal manual 17 2) Statistical parameters: chi-square goodness-of-fit test and Kolmogorov-Smirnov test. A chi-square test is conducted to compare the goodness-of-fit between the amino acid frequencies or G+C content of each sequence of the query and their mean values. To check whether the CAI of the randomly generated sequences follow a normal distribution, a Kolmogorov-Smirnov test is made. 3) The figure below is an example of the calculated expected CAI value. The value of the expected CAI at a 95% level of confidence that contain 95% of population is Also included is the CAI average from the random sequences.
18 CAIcal manual 18 SECTION C - CAI calculation for protein alignment C1. Using one reference table OVERVIEW Use this option to calculate the Codon Adaptation Index (CAI) from protein alignment translated to DNA using a unique codon usage table as reference. INPUTS 1) Introduce the protein alignment in the text box. 2) Insert the codon usage reference tables. These reference tables can be obtained from codon usage databases or created by the user.
19 CAIcal manual 19 3) Insert the codon usage reference table. These reference tables can be obtained from codon usage database or created by the user. 4) Choose the genetic code corresponding to the sequences introduced. Choosing an unsuitable genetic code may generate error messages. 5) Click on the accept button. OUTPUTS The main output in this section is the protein alignment translated to DNA with the mean weight of codons along the
20 CAIcal manual 20 alignment. We have included two tab-delimited formats, the first one has the complete result and the second one has just the mean weight of the codons and their position. The weight of the codons along the alignment can also be visualized by changing the step and the window size.
21 CAIcal manual 21 Another output are the gene parameters in a table or in tab-delimited format for copying and pasting them into a spreadsheet program. The weight of codons along the sequences can be visualized simply by selecting the window size and the step.
22 CAIcal manual 22
23 CAIcal manual 23 C2. Using one reference for each sequence OVERVIEW Use this option to calculate the Codon Adaptation Index (CAI) from protein alignment translated to DNA using a codon usage table as a reference for each sequence. INPUTS This section requires the same inputs as in section C1 but requires just one codon usage table for each sequence introduced. See Input Requirements from this tutorial.
24 CAIcal manual 24 Automation of some of the calculations To allow the calculation of CAI values for hundreds or thousands of sequences on a whole-genome scale and generate an expected value, users of the CAIcal server can download a Perl script that automatically performs these calculations. In addition, several parameters fixed in the CAIcal server (like the number and length of randomly generated sequences) can be specified in this script version. How to run it From the main page of the CAIcal/E-CAI server download the Perl script after introducing your name, institution and e- mail address. Uncompress the file. In a Linux operative system you can do it by typing: (Replace * for the appropriate version) $ tar xvf CAIcal_ECAI_v*.tar.gz $ gunzip CAIcal_ECAI_v*.gz This will generate a directory called CAIcal_v*. Enter to this directory: $ cd CAIcal_ECAI_v* To see how to run CAIcal/E-CAI execute the following command: $ perl CAIcal_ECAI _v*.pl help To run an example, execute the following command: $ perl CAIcal_ECAI _v*.pl You will need to install a Perl interpret to execute the script in a Windows operative system. Parameters to run CAIcal/E-CAI
25 CAIcal manual 25 The script needs several parameters to be executed. These parameters are specified when executing the script: $ perl CAIcal_ECAI_v -e [cai expected cai_and_expected] -f [file_name] -h [file_name] -g [1 4 11] -c [ ] -p [ ] -o1 [file_name] -o2 [file_name] -o3 [file_name] -n [number] -l [number] m [markov/poisson] PROGRAM TO EXECUTE: -e cai expected cai_and_expected <default: cai_and_expected>. The option 'cai' calculates only the CAIs of the query sequences. The expected option calculates only an expected CAI and the 'cai_and_expected' option calculates both. INPUT1 DATA FILE: -f file_name <default: example.ffn>. The DNA sequences in the input file have to be in fasta format. INPUT2 HOST FILE: -h file_name <default: human>. This file has to contain a Codon usage reference table in the Codon Usage Database format. GENETIC CODE: -g <default: 1>. This option allows choosing the Standard (1), Eubacteria (11), Mycoplasma (4) and other genetic codes. CONFIDENCE LEVEL: -c <default: 95>. PERCENTAGE OF POPULATION OR COVERAGE: -p <default: 95>. OUTPUT1 (CAI: -o1 file_name <default: cai> OUTPUT2 (CAI random sequences): -o2 file_name <default:random_sequences_and_cai> OUTPUT3(EXPECTED CAI: -o3 file_name <default: expected> METHOD: -m markov/poisson <default: markov> NUMBER OF RANDOMLY GENERATED SEQUENCES: -n number <default: 1000> LENGTH OF RANDOMLY GENERATED SEQUENCES (IN CODONS): -l number <default: 300 (100 in Poisson Method)> HELP help.
26 CAIcal manual 26 References Nakamura, Y., Gojobori, T. and Ikemura, T. Codon usage tabulated from the international DNA sequence databases: status for the year Nucl. Acids Res. 28, 292. Sharp, P.M. and Li, W. (1987) The Codon adaptation index -a measure of directional synonymous codon usage bias and its potential applications. Nucleic Acids Res., 15: Wright, F. (1990) The 'effective number of codons' used in a gene. Gene, 87:23-29.
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