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The key to brain differences between chimps and human comes down to regulator genes, not brain making genes, researchers believe. And then there is FOXP2:

a team of researchers at Oxford University showed that this language disorder is due to a mutation in a single gene called FOXP2. But perhaps even more impressive was a molecular analysis of the gene, again undertaken by Wolfgang Enard and colleagues. When they compared the FOXP2 sequence between humans and chimpanzees, they found that the human form differed from the chimpanzee's by a single mutation that was dated to about 200,000 years ago. This is the time when language is thought to have arisen.