Matthew Speir
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Hello,
Thank you for using the UCSC Genome Browser and sending your inquiry.
To help with your issues running the liftOver program, could you send us the command you are running, along with an example of the input file?
Regarding the parameters, we used those LASTZ parameters as they tend to produce higher-quality results between similar species. You can learn more about the lastz parameters we use on the following wiki pages:
http://genomewiki.ucsc.edu/index.php/DoBlastzChainNet.pl#lastz_parameter_file
http://genomewiki.ucsc.edu/index.php/Lastz_DEF_file_parameters
You can also review the following makedocs for some example dm6 LASTZ runs. Keep in mind that these makedocs are intended for internal replication.
A more detailed explanation of the LASTZ program can be found in the program's user guide:
https://www.bx.psu.edu/miller_lab/dist/README.lastz-1.02.00/README.lastz-1.02.00a.html
I hope this is helpful. If you have any further questions, please reply to gen...@soe.ucsc.edu.
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If your question includes sensitive data, you may send it instead to genom...@soe.ucsc.edu.
Jairo Navarro
UCSC Genome Browser
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Hello, James.
LiftOver often requires tweaking, and no parameter is really universal between even same-species organisms.
Your command looks reasonable, with the one parameter you may want to tweak being "-minBlocks=0.9". That is fairly restrictive, and fruitflies often have large amounts of diversity compared to even each other.
You could try reducing that to even as low as "-minBlocks=0.0001" in order to find lifting coordinates.
I hope this is helpful. Please include gen...@soe.ucsc.edu in any replies to ensure visibility by the team. All messages sent to that address are archived on our public forum. If your question includes sensitive information, you may send it instead to genom...@soe.ucsc.edu.
Lou Nassar
UCSC Genomics Institute
To view this discussion on the web visit https://groups.google.com/a/soe.ucsc.edu/d/msgid/genome/SA1PR05MB85526F24794A2D4AC2DC7423FDF2A%40SA1PR05MB8552.namprd05.prod.outlook.com.
Revealing life’s code.
Matthew Speir
UCSC Genome Browser, User Support
UC Santa Cruz Genomics Institute
Revealing life’s code.
Matthew Speir
UCSC Genome Browser, User Support
UC Santa Cruz Genomics Institute
Revealing life’s code.
Hi Matthew,
So, just make an empty file?
Jimmy deMayo, PhD (he/him)
Postdoctoral ResearcherRagland labUniversity of Colorado Denver
From: Matthew Speir <msp...@ucsc.edu>
Sent: Tuesday, September 12, 2023 4:55:08 PM