[BioC] Missing chromosomal locations in hgu133a package

Hilmar Berger hilmar.berger at imise.uni-leipzig.de
Thu Jul 13 13:54:45 CEST 2006

Hi all,

we found that there are about 8-9% of all probesets in the hgu133a package for 
which no information on chromosomal location (i.e. base pairs from the 
telomere) is available. 
However, other public databases like Golden Path offer start and end positions 
for each probeset on the array. What is the reason for this discrepancy ? 

What are the paths AnnBuilder uses in order to map probeset-IDs to chromosomal 
locations ? 

Would it be safe to use chromosomal locations obtained from other sources 
directly instead of relying on the hgu133a package ?


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