Safety assessment of genetically modified potato Spunta: Degradation of DNA in gastrointestinal tract and carryover to rat organs

Diet groups for albino rats were (group 1) control basal, (group 2) control plus 30\% freeze-dried nongenetically modified potatoes Spunta, (group 3) control plus 30\% freeze-dried Spunta genetically modified potato (GMP) G2 and (group 4) control plus 30\% freeze-dried GMP G3. After feeding ad libitum for 30 days, no statistical differences were found in food intake, daily body weight gain and feed efficiency. However, there was a small but significant difference in final body weight between the control (group 1) and experimental treatments (groups 2-4). DNA ingested in feed was partially resistant to the mechanical, chemical and enzymatic activities of the rat gastrointestinal (GI) tract (GIT) and was not completely degraded. Modified and nonmodified potato Spunta DNA survival was comparable during feed passage in the rat GIT. Modified constructs from GMP lines G2 and G3 fragment DNA were not detectable in tissue samples.