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RNALFOLD(1) User Commands RNALFOLD(1) NAME RNALfold - manual page for RNALfold 2.4.14 SYNOPSIS RNALfold [OPTIONS]... DESCRIPTION RNALfold 2.4.14 calculate locally stable secondary structures of RNAs Compute locally stable RNA secondary structure with a maximal base pair span. For a sequence of length n and a base pair span of L the algo- rithm uses only O(n+L*L) memory and O(n*L*L) CPU time. Thus it is prac- tical to "scan" very large genomes for short RNA structures. Output consists of a list of secondary structure components of size <= L, one entry per line. Each output line contains the predicted local structure its energy in kcal/mol and the starting position of the local struc- ture. -h, --help Print help and exit --detailed-help Print help, including all details and hidden options, and exit --full-help Print help, including hidden options, and exit -V, --version Print version and exit General Options: Below are command line options which alter the general behavior of this program -v, --verbose Be verbose (default=off) -L, --span=INT Set the maximum distance between any two pairing nucleotides. (default=`150') This option specifies the window length L and therefore the up- per limit for the distance between the bases i and j of any pair (i, j), i.e. (j - i + 1) <= L. --noconv Do not automatically substitude nucleotide "T" with "U" (default=off) -o, --outfile[=<filename>] Print output to file instead of stdout This option may be used to write all output to output files rather than printing to stdout. The number of output files cre- ated for batch input (multiple sequences) depends on three con- ditions: (i) In case an optional filename is given as parameter argument, a single file with the specified filename will be written into. If the optional argument is omitted, (ii) FASTA input or an active --auto-id switch will write to multiple files that follow the naming scheme "prefix.lfold". Here, "prefix" is taken from the sequence id as specified in the FASTA header. Lastly, (iii) single-line sequence input without FASTA header will be written to a single file "RNALfold_output.lfold". In case an output file already exists, any output of the program will be appended to it. Since the filename argument is op- tional, it must immediately follow the short option flag to not be mistaken as new parameter to the program. For instance \'-or- nafold.out\' will write to a file "rnafold.out". Note: Any spe- cial characters in the filename will be replaced by the filename delimiter, hence there is no way to pass an entire directory path through this option yet. (See also the "--filename-delim" parameter) -i, --infile=<filename> Read a file instead of reading from stdin The default behavior of RNALfold is to read input from stdin. Using this parameter the user can specify an input file name where data is read from. --auto-id Automatically generate an ID for each sequence. (default=off) The default mode of RNALfold is to automatically determine an ID from the input sequence data if the input file format allows to do that. Sequence IDs are usually given in the FASTA header of input sequences. If this flag is active, RNALfold ignores any IDs retrieved from the input and automatically generates an ID for each sequence. This ID consists of a prefix and an increas- ing number. This flag can also be used to add a FASTA header to the output even if the input has none. --id-prefix=prefix Set prefix for automatically generated IDs (default=`sequence') If this parameter is set, each sequence will be prefixed with the provided string. Hence, the output files will obey the fol- lowing naming scheme: "prefix_xxxx.lfold" where xxxx is the se- quence number. Note: Setting this parameter implies --auto-id. --id-delim=delimiter Change prefix delimiter for automatically generated ids. (default=`_') This parameter can be used to change the default delimiter "_" between the prefix string and the increasing number for automatically generated IDs --id-digits=INT Specify the number of digits of the counter in automatically generated alignment IDs. (default=`4') When alignments IDs are automatically generated, they receive an increasing number, starting with 1. This number will always be left-padded by leading zeros, such that the number takes up a certain width. Using this parameter, the width can be specified to the users need. We allow numbers in the range [1:18]. This option implies --auto-id. --id-start=LONG Specify the first number in automatically generated alignment IDs. (default=`1') When sequence IDs are automatically generated, they receive an increasing number, usually starting with 1. Using this parame- ter, the first number can be specified to the users require- ments. Note: negative numbers are not allowed. Note: Setting this parameter implies to ignore any IDs retrieved from the in- put data, i.e. it activates the --auto-id flag. --filename-delim=delimiter Change the delimiting character that is used for sanitized filenames (default=`ID-delimiter') This parameter can be used to change the delimiting character used while sanitizing filenames, i.e. replacing invalid charac- ters. Note, that the default delimiter ALWAYS is the first char- acter of the "ID delimiter" as supplied through the --id-delim option. If the delimiter is a whitespace character or empty, in- valid characters will be simply removed rather than substituted. Currently, we regard the following characters as illegal for use in filenames: backslash '\', slash '/', question mark '?', per- cent sign '%', asterisk '*', colon ':', pipe symbol '|', double quote '"', triangular brackets '<' and '>'. --filename-full Use full FASTA header to create filenames (default=off) This parameter can be used to deactivate the default behavior of limiting output filenames to the first word of the sequence ID. Consider the following example: An input with FASTA header ">NM_0001 Homo Sapiens some gene" usually produces output files with the prefix "NM_0001" without the additional data available in the FASTA header, e.g. "NM_0001.lfold". With this flag set, no truncation of the output filenames is performed, i.e. output filenames receive the full FASTA header data as prefixes. Note, however, that invalid characters (such as whitespace) will be substituted by a delimiting character or simply removed, (see also the parameter option --filename-delim). --commands=<filename> Read additional commands from file Commands include hard and soft constraints, but also structure motifs in hairpin and interior loops that need to be treeted differently. Furthermore, commands can be set for unstructured and structured domains. Algorithms: Select additional algorithms which should be included in the calculations. The Minimum free energy (MFE) and a structure representative are calculated in any case. -z, --zscore[=DOUBLE] Limit the output to predictions with a Z-score below a threshold (default=`-2') This option activates z-score regression using a trained SVM. Any predicted structure that exceeds the specified threshold will be ommited from the output. Since the Z-score threshold is given as a negative number, it must immediately preceed the short option to not be mistaken as a separate argument, e.g. -z-2.9 sets the threshold to a value of -2.9 -g, --gquad Incoorporate G-Quadruplex formation into the structure predic- tion algorithm (default=off) --shape=<filename> Use SHAPE reactivity data to guide structure predictions. --shapeMethod=D/Z/W Include SHAPE reactivity data according to a particular method. (default=`D') The following methods can be used to convert SHAPE reactivities into pseudo energy contributions. 'D': Convert by using a linear equation according to Deigan et al 2009. The calculated pseudo energies will be applied for ev- ery nucleotide involved in a stacked pair. This method is recog- nized by a capital 'D' in the provided parameter, i.e.: --shapeMethod="D" is the default setting. The slope 'm' and the intercept 'b' can be set to a non-default value if necessary, otherwise m=1.8 and b=-0.6. To alter these parameters, e.g. m=1.9 and b=-0.7, use a parameter string like this: --shapeMethod="Dm1.9b-0.7". You may also provide only one of the two parameters like: --shapeMethod="Dm1.9" or --shapeMethod="Db-0.7". 'Z': Convert SHAPE reactivities to pseudo energies according to Zarringhalam et al 2012. SHAPE reactivities will be converted to pairing probabilities by using linear mapping. Aberration from the observed pairing probabilities will be penalized during the folding recursion. The magnitude of the penalties can affected by adjusting the factor beta (e.g. --shapeMethod="Zb0.8"). 'W': Apply a given vector of perturbation energies to unpaired nucleotides according to Washietl et al 2012. Perturbation vec- tors can be calculated by using RNApvmin. --shapeConversion=type Convert SHAPE reactivity according to a particular model. (default=`O') This method allows one to specify the method or model used to convert SHAPE reactivities to pairing (or unpaired) probabili- ties when using the SHAPE approach of Zarringhalam et al. 2012. The following single letter types are recognized: 'M': Use linear mapping according to Zarringhalam et al. 2012. 'C': Use a cutoff-approach to divide into paired and unpaired nucleotides (e.g. "C0.25") 'S': Skip the normalizing step since the input data already rep- resents probabilities for being unpaired rather than raw reac- tivity values 'L': Use a linear model to convert the reactivity into a proba- bility for being unpaired (e.g. "Ls0.68i0.2" to use a slope of 0.68 and an intercept of 0.2) 'O': Use a linear model to convert the log of the reactivity into a probability for being unpaired (e.g. "Os1.6i-2.29" to use a slope of 1.6 and an intercept of -2.29) Model Details: You may tweak the energy model and pairing rules additionally using the following parameters -T, --temp=DOUBLE Rescale energy parameters to a temperature of temp C. Default is 37C. -4, --noTetra Do not include special tabulated stabilizing energies for tri-, tetra- and hexaloop hairpins. (default=off) -d, --dangles=INT Change the dangling end model (default=`2') This option allows one to change the model "dangling end" energy contributions, i.e. those additional contributions from bases adjacent to helices in free ends and multi-loops With -d1 only unpaired bases can participate in at most one dangling end. With -d2 this check is ignored, dangling energies will be added for the bases adjacent to a helix on both sides in any case; this is the default for mfe and partition function folding (-p). The option -d0 ignores dangling ends altogether (mostly for de- bugging). With -d3 mfe folding will allow coaxial stacking of adjacent helices in multi-loops. At the moment the implementa- tion will not allow coaxial stacking of the two interior pairs in a loop of degree 3 and works only for mfe folding. Note that with -d1 and -d3 only the MFE computations will be us- ing this setting while partition function uses -d2 setting, i.e. dangling ends will be treated differently. --noLP Produce structures without lonely pairs (helices of length 1). (default=off) For partition function folding this only disallows pairs that can only occur isolated. Other pairs may still occasionally oc- cur as helices of length 1. --noGU Do not allow GU pairs (default=off) --noClosingGU Do not allow GU pairs at the end of helices (default=off) -P, --paramFile=paramfile Read energy parameters from paramfile, instead of using the de- fault parameter set. Different sets of energy parameters for RNA and DNA should ac- company your distribution. See the RNAlib documentation for de- tails on the file format. When passing the placeholder file name "DNA", DNA parameters are loaded without the need to actually specify any input file. --nsp=STRING Allow other pairs in addition to the usual AU,GC,and GU pairs. Its argument is a comma separated list of additionally allowed pairs. If the first character is a "-" then AB will imply that AB and BA are allowed pairs. e.g. RNALfold -nsp -GA will allow GA and AG pairs. Nonstandard pairs are given 0 stacking energy. -e, --energyModel=INT Rarely used option to fold sequences from the artificial ABCD... alphabet, where A pairs B, C-D etc. Use the energy parameters for GC (-e 1) or AU (-e 2) pairs. REFERENCES If you use this program in your work you might want to cite: R. Lorenz, S.H. Bernhart, C. Hoener zu Siederdissen, H. Tafer, C. Flamm, P.F. Stadler and I.L. Hofacker (2011), "ViennaRNA Package 2.0", Algorithms for Molecular Biology: 6:26 I.L. Hofacker, W. Fontana, P.F. Stadler, S. Bonhoeffer, M. Tacker, P. Schuster (1994), "Fast Folding and Comparison of RNA Secondary Struc- tures", Monatshefte f. Chemie: 125, pp 167-188 R. Lorenz, I.L. Hofacker, P.F. Stadler (2016), "RNA folding with hard and soft constraints", Algorithms for Molecular Biology 11:1 pp 1-13 I.L. Hofacker, B. Priwitzer, and P.F. Stadler (2004), "Prediction of Locally Stable RNA Secondary Structures for Genome-Wide Surveys", Bioinformatics: 20, pp 186-190 The energy parameters are taken from: D.H. Mathews, M.D. Disney, D. Matthew, J.L. Childs, S.J. Schroeder, J. Susan, M. Zuker, D.H. Turner (2004), "Incorporating chemical modifica- tion constraints into a dynamic programming algorithm for prediction of RNA secondary structure", Proc. Natl. Acad. Sci. USA: 101, pp 7287-7292 D.H Turner, D.H. Mathews (2009), "NNDB: The nearest neighbor parameter database for predicting stability of nucleic acid secondary structure", Nucleic Acids Research: 38, pp 280-282 AUTHOR Ivo L Hofacker, Peter F Stadler, Ronny Lorenz REPORTING BUGS If in doubt our program is right, nature is at fault. Comments should be sent to rna@tbi.univie.ac.at. SEE ALSO RNAplfold(1) RNALalifold(1) RNALfold 2.4.14 August 2019 RNALFOLD(1)
NAME | SYNOPSIS | DESCRIPTION | REFERENCES | AUTHOR | REPORTING BUGS | SEE ALSO
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