[BioC] chromosome arms missing from Affy's Mapping 500K Array Set SNP chips?

Stephanie Mewborn skmewbor at uchicago.edu
Wed Sep 19 22:26:44 CEST 2007

Human chromosomes 13, 14, 15, 21, and 22 are acrocentric chromosomes 
which lack a p arm.  The only DNA content in the location of a p arm is 
stalk and satellite DNA and the ribosomal DNA.

Stephanie K. Mewborn, Ph.D.
Post-Doctoral Fellow
McNally Lab
University of Chicago, Department of Medicine
G611 Mail Code:  MC6088
5841 S. Maryland Ave.
Chicago, IL  60637

Phone:  773.702.2684
Fax:  773.702.2681
Email:  skmewbor at uchicago.edu

Wittner, Ben, Ph.D. wrote:
> >From inspecting the files Mapping250K_Nsp.na22.annot.csv and
> Mapping250K_Sty.na22.annot.csv, which I downloaded from the Affy web site, it
> seems to me that Affy's Mapping 500K Array Set SNP chips do not probe the p arms
> of chromosomes 13, 14, 15 and 22.
> Is that right?
> If so, does anyone know why that is?
> Thanks in advance.
> -Ben
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