http://www.biofortified.org/genera/studies-for-genera/independent-funding/ is a list of 126 articles on GM foods, apparently independently funded. 10 contain potato in the title.
Only two involved feeding potatoes to animals:
Ewen SWB, Pusztai A (1999) concluded that it made the rats sick.
Rhee, G.S., Cho, D.H., Won, Y.H., Seok, J.H., Kim, S.S., Kwack, S.J., Lee, R.D., Chae, S.Y., Kim, J.W., Lee, B.M., Park, K.L., Choi, K.S., 2005. concluded that the rats were fine. I could not find the complete article
Kuiper HA, Hub P J M Noteborn, and ACM Peijnenburg. 1999 Adequacy of methods for testing the safety of genetically modified foods. Lancet 354:1315-6. This paper suggests Arpad Pusztai's research was flawed.
I can't find this on the internet but would be interested to read it.
http://www.ncbi.nlm.nih.gov/sites/pubmed/18320254 assesses the bioavailability of carotenoids in GM potatoes, and involves subjects eating 1100g of potatoes on two occasions a week apart. This may have been enough to assess its bioavailability but it does nothing to assess its safety as a food.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1242293/?tool=pubmed describes mass spectrophotometer fingerprinting of GM and non GM potatoes but does not include any feeding trials.
Defernez M, Gunning YM, Parr AJ, Shepherd LV, Davies HV, Colquhoun IJ. (2004) J Agric Food Chem. 2004 Oct 6;52(20):6075-85. NMR and HPLC-UV profiling of potatoes with genetic modifications to metabolic pathways. describes differences in metabolites in various GM and non GM cultivars. It finds differences but said they did not appear important, again no testing on animals.
Enot DP Manfred Beckmann, David Overy, and John Draper (2006) Predicting interpretability of metabolome models based on behavior, putative identity, and biological relevance of explanatory signals PNAS October 3, 2006 vol. 103(40): 14865–14870 How to work out whether plants have substantially equivalent metabolite content, including an analysis of transgenic potatoes. another metabolite fingerprinting exercise, without actually testing any of the potatoes on animals or humans.
Next is: Lehesranta,Satu J., Howard V. Davies, Louise V.T. Shepherd, Naoise Nunan, Jim W. McNicol, Seppo Auriola, Kaisa M. Koistinen, Soile Suomalainen, Harri I. Kokko and Sirpa O. Kärenlampi. 2005. Comparison of Tuber Proteomes of Potato Varieties, Landraces, and Geneticallyn Modified Lines. Plant Physiology 138:1690-1699.
it has a lot of information about proteomes and the differences between varieties both GM and other wise but no conclusions about how safe they are to eat.
The eighth is Rhee, G.S., Cho, D.H., Won, Y.H., Seok, J.H., Kim, S.S., Kwack, S.J., Lee, R.D., Chae, S.Y., Kim, J.W., Lee, B.M., Park, K.L., Choi, K.S., 2005. Multigeneration reproductive and developmental toxicity study of bar gene inserted into genetically modified potato on rats. J. Toxicol. Environ. Health A 68, 2263–2276.
This paper concluded that the GM potatoes didn't do the rats any harm, but I cannot find the complete paper only the abstract.
Shepherd LV, McNicol JW, Razzo R, Taylor MA, Davies HV (2006). Assessing the potential for unintended effects in genetically modified potatoes perturbed in metabolic and developmental processes. Targeted analysis of key nutrients and anti-nutrients. Transgenic Res. 15(4):409-25. Again I could only find the abstract and it did not refer to the safety or otherwise of eating GM potatoes.