@article {Nagayae001792, author = {Masaki Nagaya and Koki Hasegawa and Masahito Watanabe and Kazuaki Nakano and Kazutoshi Okamoto and Takeshi Yamada and Ayuko Uchikura and Kenji Osafune and Harumasa Yokota and Taiji Nagaoka and Hitomi Matsunari and Kazuhiro Umeyama and Eiji Kobayashi and Hiromitsu Nakauchi and Hiroshi Nagashima}, title = {Genetically engineered pigs manifesting pancreatic agenesis with severe diabetes}, volume = {8}, number = {2}, elocation-id = {e001792}, year = {2020}, doi = {10.1136/bmjdrc-2020-001792}, publisher = {BMJ Specialist Journals}, abstract = {Introduction Pancreatic duodenum homeobox 1 (Pdx1) expression is crucial for pancreatic organogenesis and is a key regulator of insulin gene expression. Hairy and enhancer of split 1 (Hes1) controls tissue morphogenesis by maintaining undifferentiated cells. Hes1 encodes a basic helix loop helix (bHLH) transcriptional repressor and functionally antagonizes positive bHLH genes, such as the endocrine determination gene neurogenin-3. Here, we generated a new pig model for diabetes by genetic engineering Pdx1 and Hes1 genes.Research design and methods A transgenic (Tg) chimera pig with germ cells carrying a construct expressing Hes1 under the control of the Pdx1 promoter was used to mate with wild-type gilts to obtain Tg piglets.Results The Tg pigs showed perinatal death; however, this phenotype could be rescued by insulin treatment. The duodenal and splenic lobes of the Tg pigs were slender and did not fully develop, whereas the connective lobe was absent. β cells were not detected, even in the adult pancreas, although other endocrine cells were detected, and exocrine cells functioned normally. The pigs showed no irregularities in any organs, except diabetes-associated pathological alterations, such as retinopathy and renal damage.Conclusion Pdx1-Hes1 Tg pigs were an attractive model for the analysis of pancreatic development and testing of novel treatment strategies for diabetes.}, URL = {https://drc.bmj.com/content/8/2/e001792}, eprint = {https://drc.bmj.com/content/8/2/e001792.full.pdf}, journal = {BMJ Open Diabetes Research and Care} }