Additional diagnoses have since been made, and a few patients have been found to have microdeltions that involve the region in which the PRR36 gene is found, meaning the PRP36 protein would not be found in these individuals. However, this region also included other genes whose functions are well known; for example the obesity observed in the patients can be traced to the deletion of the insulin receptor gene. Other symptoms, such a learning disabilities and speech impediments can be tied to similar gene deletions. However, it is possible that PRP36 absence causes a minor disability that is masked by these other symptoms. Additionally, it is possible that PRP36 plays a secondary role with one or more of these other deleted genes. This second option can be slightly supported by noting that other proline rich proteins that have known function, both on human chromosome 19 and other chromosomes, tend to more frequently produce proteins that are involved in protein-protein interactions than many other general types of genes.