[BioC] Protein position to genomic location

[Dave Wettmann [guest]]

Hello,
I have a list of several hundred amino acid change and would like to locate the genomic location for each of them.  I also have the transcript ID the amino acid position correspond to.  I was wondering if this is possible using GenomicFeatures package?  I guess this query is the opposite way that to most annotations for which there is a lot of documentation and tools.   

Thanks,
Dave

 -- output of sessionInfo(): 

R version 3.0.3 (2014-03-06)
Platform: x86_64-apple-darwin10.8.0 (64-bit)

locale:
[1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     
> 

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