Question: What "chrUn" stand for in UCSC genome browser web server?
gravatar for m.koohi.m
2.0 years ago by
United States
m.koohi.m110 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 • 2.3k views
ADD COMMENTlink modified 8 weeks ago by Biostar ♦♦ 20 • written 2.0 years ago by m.koohi.m110
gravatar for James Ashmore
2.0 years 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."

ADD COMMENTlink modified 2.0 years ago • written 2.0 years ago by James Ashmore2.6k
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