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Old 08-31-2011, 06:06 AM   #1
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Location: vienna

Join Date: Aug 2011
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Default bfast index

Hi everybody,

i am new here at this forum and hereby i would like to greet everybody.

I would like to try the bfast algorithm to map Solid reads (colourspace) to human genome. Now i try to index the genome (hg19) but i am really confused how to do that.

Did i understand it right that, if i want to use the recommended masks (given in the bfast-book, section 7.1.2 for ABI Solid reads with at least 50bp in length) that i have to index the genome 10 times using the following commands:

bfast index -f hg19.fa -m 1111111111111111111111 -w 14 -i 1
bfast index -f hg19.fa -m 111110100111110011111111111 -w 14 -i 2
bfast index -f hg19.fa -m 10111111011001100011111000111111 -w 14 -i 3

bfast index -f hg19.fa -m 1110110001011010011100101111101111 -w 14 -i 9
bfast index -f hg19.fa -m 111111001000110001011100110001100011111 -w 14 -i 10


And another question is:
for the mapping the reads in colorspace are converted to fastq files and than used for the mapping (using the command: solid2fastq -n ... -o reads *.csfasta *.qual). Doesn't have the conversion from colorspace reads to fastq reads an adverse affect (in terms of e.g. loss of information ...)?

Thank you very much!

Best regards,
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Old 08-31-2011, 06:17 AM   #2
Nils Homer
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Location: Boston, MA, USA

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1. Yes, you must create ten indices.

2. No loss of information. The original data is present in the mapped SAM file in the CS/CZ tags.
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