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Unkown NCBI genome chromosomes

Hi everyone,

I am trying to work with the GRCh38 (https://www-ncbi-nlm-nih-gov.tudelft.idm.oclc.org/genome/guide/human/#learn) from ncbi but i am encountering all sorts of chromosomes with which I am not familiar. Some examples to illustrate:

chr11_KI270721v1_random chr19_KV575247v1_alt chr22_KQ759762v1_fix

It is probably a rookie question but does anyone know what they mean? I can't find anything on the ncbi website.

Any help is much appreciated!

Stijn

ncbi chromosome
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updated by vkkodali_ncbi vkkodali_ncbi • written by robbenstijn • robbenstijn

They are valid parts of human genome. Take a look at Heng Li's blog post.

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written by GenoMax GenoMax

1 answer

For definitions of these terms, see: https://www.ncbi.nlm.nih.gov/grc/help/definitions/

  • chr11_KI270721v1_random -- unlocalized scaffold
  • chrUn_GL000195v1 -- unplaced scaffold
  • chr19_KV575247v1_alt -- alternate locus or a novel-patch sequence
  • chr22_KQ759762v1_fix -- fix-patch sequence
• 0 views • link
written by vkkodali_ncbi vkkodali_ncbi

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