Main interests of Cosma's group are to dissect mechanisms and factors controlling somatic cell reprogramming and tissue regeneration in mammals. We are investigating gene networks and reprogramming factors controlled by the activation of Wnt/ß-catenin pathway. Furthermore, by using super resolution microscopy we made discoveries on the remodelling and looping of the chromatin fiber during the reprograming process. The activation of Wnt pathway controls regeneration in response to damage in lower and higher vertebrates. We found that the Wnt/ß-catenin signalling is also key to control cell-fusion-mediated regeneration in mammals. We recently showed that human Muller glia cells can fuse with mesenchymal stem cells. The resulting hybrids can differentiate in retinal neurons in human retinal organoids. Moreover we identified the interactions between the chemokine receptors and specific chemokines able to enhance migration and integration of transplanted cells into the retina.