README.mlagan for MLAGAN multiple aligner v2.0 Author: Michael Brudno (brudno@cs.toronto.edu) Updated 09/14/2006 LAGAN was developed by Michael Brudno, Chuong Do, Michael F Kim, Mukund Sundararajan and Serafim Batzoglou of the Dept of Computer Science at Stanford University, with assistance from many other people. See http://lagan.stanford.edu or contact lagan@cs.stanford.edu for more information. I Description MLAGAN is a multiple global alignment tool. It does a Needleman-Wunsch alignment in a limited area of the matrix, determined during an anchoring phase. The algorithm consists of 3 main parts, each documented in its own README file: 1. Generation of ordered local alignments (anchors) between all pairs of sequences, using the CHAOS local alignment tool and anchors program 2. Doing progressive global alignment, guided by a phylogenetic tree, in a limited area of thw NW matrix given the set of anchors. mlagan is the main executable. II Usage 1. Input Mlagan accepts requires two or more fasta files (first arguments), optionally takes a -tree argument specifying a phylogenetic tree, reads gap and substitution parameters from nucmatrix.txt file (or another optionally provided file) and takes several optional command line options: nucmatrix.txt -- This file has the substitution matrix used by lagan and the gap penalties. The gaps penalties are on the line immediately after the matrix, the first number is the gap open, the second the gap continue. -tree "string" You need to specify a phylogenetic tree for the sequences. This must be a pairwise tree, with parenthesis specifying nodes. Here are a few examples: "(human (mouse rat))" "((human mouse)(fugu zebrafish))" The name of each sequence must be specified somewhere on the fasta line of the input sequence: >g324325|Homo sapiens human ACTGG.... Either "Homo" or "sapiens" or "human" are valid names to call the sequence. -translate [default off] Use translated anchoring (homology done on the amino acid level). This is useful for distant (human/chicken, human/fish, and the like) comparisons. -fastreject [default off] Abandon the alignment if the homology looks weak. Currently tuned for human/mouse distance, or closer. Please contact the authors for more details on this option. -out filename [default standard out] Output the alignment to filename, rather than standard out. 2. Output The output by default is in Multi-FASTA format. You can use the mpretty tool in the utils directory to view a human-friendly version. 3. Prolagan Prolagan is the pairwise progressive step of mlagan. It should be run just like mlagan, but with two additional arguments, -pro1 and -pro2 which are files with profiles (alignments) which should be aligned together. Note that all sequences (and the tree) must still be given to prolagan. This program is useful if you have two alignments already and want to just align them, instead of realigning all sequences.
