I discovered this article yesterday and thought you all would find it fascinating. Apparently there is a family in England whose members have difficulty associating word sounds with meanings. Obviously this has a large effect on their ability to deal with standard modes of education, and also influences their social interactions. The cool part is, they have traced this difficulty to a gene called FOXP2, and are getting insights into the genetics of language.
And by the way, for those who might be wondering if we have a "language gene," it's not as simple as all that. FOXP2 occurs through a lot of nonhuman world species as well. So a further exploration of the complexities of FOXP2 is here.