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Top Forums Shell Programming and Scripting Parsing a fasta sequence with start and end coordinates Post 302514152 by empyrean on Friday 15th of April 2011 01:29:40 AM
Old 04-15-2011
Parsing a fasta sequence with start and end coordinates

Hi.. I have a seperate chromosome sequences and i wanted to parse some regions of chromosome based on start site and end site.. how can i achieve this?

For Example Chr 1 is in following format

Quote:
>chr1
GAATTCCAAAGCCAAAGATTGCATCAGTTCTGCTGCTATTTCCTCCTATCATTCTTTCTGATGTTGAAAATGATATTAAG
I need regions from 2 - 10 should give me AATTCCAAA

and in a similar way 15- 25 should give me AAGATTGCAT

and from 27 - 30 should give me AGTT

How can i do it either in perl or bioperl or awk or any other way?

Last edited by empyrean; 04-15-2011 at 02:55 AM..
 

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BP_MASK_BY_SEARCH(1p)					User Contributed Perl Documentation				     BP_MASK_BY_SEARCH(1p)

NAME
mask_by_search - mask sequence(s) based on its alignment results SYNOPSIS
mask_by_search.pl -f blast genomefile blastfile.bls > maskedgenome.fa DESCRIPTION
Mask sequence based on significant alignments of another sequence. You need to provide the report file and the entire sequence data which you want to mask. By default this will assume you have done a TBLASTN (or TFASTY) and try and mask the hit sequence assuming you've provided the sequence file for the hit database. If you would like to do the reverse and mask the query sequence specify the -t/--type query flag. This is going to read in the whole sequence file into memory so for large genomes this may fall over. I'm using DB_File to prevent keeping everything in memory, one solution is to split the genome into pieces (BEFORE you run the DB search though, you want to use the exact file you BLASTed with as input to this program). Below the double dash (--) options are of the form --format=fasta or --format fasta or you can just say -f fasta By -f/--format I mean either are acceptable options. The =s or =n or =c specify these arguments expect a 'string' Options: -f/--format=s Search report format (fasta,blast,axt,hmmer,etc) -sf/--sformat=s Sequence format (fasta,genbank,embl,swissprot) --hardmask (booelean) Hard mask the sequence with the maskchar [default is lowercase mask] --maskchar=c Character to mask with [default is N], change to 'X' for protein sequences -e/--evalue=n Evalue cutoff for HSPs and Hits, only mask sequence if alignment has specified evalue or better -o/--out/ --outfile=file Output file to save the masked sequence to. -t/--type=s Alignment seq type you want to mask, the 'hit' or the 'query' sequence. [default is 'hit'] --minlen=n Minimum length of an HSP for it to be used in masking [default 0] -h/--help See this help information AUTHOR - Jason Stajich Jason Stajich, jason-at-bioperl-dot-org. perl v5.14.2 2012-03-02 BP_MASK_BY_SEARCH(1p)
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