runs similar algorithm like CD-HIT but using BLAST to calculate similarities


Usage psi-cd-hit [Options]


in_dbname, required
out_dbname, required
clustering threshold (sequence identity), default 0.3
-ce clustering threshold (blast expect), default -1,
it means by default it doesn't use expect threshold, but with positive value, the program cluster seqs if similarities meet either identity threshold or expect threshold
coverage of shorter sequence ( aligned / full), default 0.0
coverage of longer sequence ( aligned / full), default 0.0
(1/0) use psi-blast profile? default 0 perform psi-blast / pdb-blast type search
(1/0) use global identity? default 1 sequence identity calculated as
total identical residues of local alignments / length of shorter seq
if you prefer to use -G 0, it is suggested that you also use -L, such as -L 0.8, to prevent very short matches.
length of description line in the .clstr file, default 30 if set to 0, it takes the fasta defline and stops at first space
length_of_throw_away_sequences, default 10
profile search para, default
"-a 2 -d nr80 -j 3 -F F -e 0.001 -b 500 -v 500"
-bfdb profile database, default nr80
blast search para, default
"-F F -e 0.000001 -b 100000 -v 100000"
-be blast expect cutoff, default 0.000001
filename of list of hosts to run this program in parallel with ssh calls, you need provide a list of hosts
-pbs No of jobs to send each time by PBS querying system
you can not use both ssh and pbs at same time
-k (1/0) keep blast raw output file, default 1
-rs steps of save restart file and clustering output, default 5000
everytime after process 5000 sequences, program write a restart file and current clustering information
-restart restart file, readin a restart file
if program crash, stoped, termitated, you can restart it by add a option "-restart sth.restart"
-rf steps of re format blast database, default 200,000
if program clustered 200,000 seqs, it remove them from seq pool, and re format blast db to save time
-local dir of local blast db,
when run in parallel with ssh (not pbs), I can copy blast dbs to local drives on each node to save blast db reading time BUT, IT MAY NOT FASTER
job, job_file, exe specific jobs like parse blast outonly DON'T use it, it is only used by this program itself
-single files of ids those you known that they are singletons
so I won't run them as queries
============================== by Weizhong Li, [email protected] ==============================
If you find cd-hit useful, please kindly cite:
"Clustering of highly homologous sequences to reduce thesize of large protein database", Weizhong Li, Lukasz Jaroszewski & Adam GodzikBioinformatics, (2001) 17:282-283 "Cd-hit: a fast program for clustering and comparing large sets of protein or nucleotide sequences", Weizhong Li & Adam Godzik Bioinformatics, (2006) 22:1658-1659