This directory contains alignments of the following assemblies:
- target/reference: Zebrafish (danRer3, May 2005, Sanger Centre, Danio rerio Sequencing Project Zv5)
- query: Fugu (fr1, Aug. 2002, JGI V3.0)
Files included in this directory:
- md5sum.txt: md5sum checksums for the files in this directory
- danRer3.fr1.all.chain.gz: chained blastz alignments. The chain format is
described in http://genome.ucsc.edu/goldenPath/help/chain.html .
- danRer3.fr1.net.gz: "net" file that describes rearrangements between
the species and the best Fugu match to any part of the
Zebrafish genome. The net format is described in
http://genome.ucsc.edu/goldenPath/help/net.html .
- axtNet/*.danRer3.fr1.net.axt.gz: chained and netted alignments,
i.e. the best chains in the Zebrafish genome, with gaps in the best
chains filled in by next-best chains where possible. The axt format is
described in http://genome.ucsc.edu/goldenPath/help/axt.html .
The danRer3 and fr1 assemblies were aligned by the blastz alignment
program, which is available from Webb Miller's lab at Penn State
University (http://www.bx.psu.edu/miller_lab/). Any danRer3 sequences larger
than 10,010,000 bases were split into chunks of 10,010,000 bases overlapping
by 10,000 bases for alignment. A similar process was followed for fr1,
with chunks of 10,000,000 overlapping by 0.) Following alignment, the
coordinates of the chunk alignments were corrected by the
blastz-normalizeLav script written by Scott Schwartz of Penn State.
Because the danRer3 chrNA and chrUn chromosomes and the fr1 chrUn
chromosome are comprised of unordered scaffolds separated by 500 <em>N</em>s
and 1000 <em>N</em>s respectively, the blastz alignments and subsequent
chaining were first performed on the scaffolds, and the coordinates were then
lifted up to the chromosome level. This avoided false alignments across the
<em>N</em>s.
The blastz scoring matrix (Q parameter) used was:
A C G T
A 91 -90 -25 -100
C -90 100 -100 -25
G -25 -100 100 -90
T -100 -25 -90 91
with a gap open penalty of O=400 and a gap extension penalty of E=30.
The minimum score for an alignment to be kept was K=3000 for the first pass
and L=2200 for the second pass, which restricted the search space to the
regions between two alignments found in the first pass. The minimum
score for alignments to be interpolated between was H=2000.
The .lav format blastz output was translated to the .psl format with
lavToPsl, then chained by the axtChain program.
Chained alignments were processed into nets by the chainNet, netSyntenic,
and netClass programs.
Best-chain alignments in axt format were extracted by the netToAxt program.
All programs run after blastz were written by Jim Kent at UCSC.
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If you plan to download a large file or multiple files from this directory,
we recommend you use ftp rather than downloading the files via our website.
To do so, ftp to hgdownload.cse.ucsc.edu, then go to the directory
goldenPath/danRer3/vsFr1/. To download multiple files, use the "mget"
command:
mget <filename1> <filename2> ...
- or -
mget -a (to download all files in the current directory)
All files in this directory are freely available for public use.
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References
Chiaromonte, F., Yap, V.B., and Miller, W. Scoring pairwise genomic
sequence alignments. Pac Symp Biocomput 2002, 115-26 (2002).
Kent, W.J., Baertsch, R., Hinrichs, A., Miller, W., and Haussler, D.
Evolution's cauldron: Duplication, deletion, and rearrangement in the
mouse and human genomes. Proc Natl Acad Sci USA 100(20), 11484-11489
(2003).
Schwartz, S., Kent, W.J., Smit, A., Zhang, Z., Baertsch, R., Hardison, R.,
Haussler, D., and Miller, W. Human-mouse alignments with BLASTZ</A>.
Genome Res. 13(1), 103-7 (2003).
Name Last modified Size Description
Parent Directory -
axtNet/ 2005-11-17 15:12 -
danRer3.fr1.all.chain.gz 2005-08-16 15:26 48M
danRer3.fr1.net.gz 2005-08-16 16:20 25M
md5sum.txt 2005-11-17 15:12 2.1K