Dear Genome Browser team,

I would like to ask for your help regarding the Xenopus genome assembly 
version that is available on the UCSC Genome Browser, and how it 
corresponds to Ensembl versions. From the README file  in the download 
directory for the Xenopus genome, I understand that the assembly version 
that was used is JGI v4.1, released in August 2005. From the Ensembl 
website, I gathered that this same version was used in most of the 
latest Ensembl releases (prior to release 62). However, the two fasta 
files (the one downloaded from the UCSC and the one downloaded from 
Ensembl) are not the same: the one present in Ensembl has 19,501 
contigs, and the one in UCSC has 19,759 contigs; moreover, the sequences 
are not identical, even for those contigs found in both files.

Could you please help me solve out this issue ?  I also noticed that 
Ensembl annotations are available for download from the UCSC Tables; do 
these annotations correspond to the assembly version that is available 
for download on the UCSC website ?

Thank you very much for your help !

Best wishes,

Anamaria

-- 
Anamaria Necsulea
Postdoctoral fellow

Center for Integrative Genomics
Genopode
University of Lausanne
CH-1015 Lausanne
Switzerland

Telephone: ++41 21 692 3962
  Fax:      ++41 21 692 3965

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