Question: What "chrUn" stand for in UCSC genome browser web server?
1
gravatar for m.koohi.m
18 months ago by
m.koohi.m90
United States
m.koohi.m90 wrote:

In UCSC genome browser web server there are some chromosome which start with "chrUn", for example chrUn_KI270438v1. What are these chromosome exactly? It means Unknown chromosome? If yes, why unknown?

ucsc gene genome • 1.6k views
ADD COMMENTlink modified 18 months ago by James Ashmore2.6k • written 18 months ago by m.koohi.m90
6
gravatar for James Ashmore
18 months ago by
James Ashmore2.6k
UK/Edinburgh/MRC Centre for Regenerative Medicine
James Ashmore2.6k wrote:

Quoting directly from the UCSC website:

"ChrUn contains clone contigs that cannot be confidently placed on a specific chromosome. For the chrN_random and chrUn_random files, we essentially just concatenate together all the contigs into short pseudo-chromosomes. The coordinates of these are fairly arbitrary, although the relative positions of the coordinates are good within a contig."

https://genome.ucsc.edu/FAQ/FAQdownloads.html

ADD COMMENTlink modified 18 months ago • written 18 months ago by James Ashmore2.6k
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