There are many many genes for intelligence and all of us have different mixes with different 'side-effects' or lack thereof. One gifted child could end up very different from another gifted child. But with that said, there are some definite patterns that I am picking up from reading forums/articles/studies.
Read any gifted forum and you will undoubtedly have several posts (much more than should be expected by chance) on the same disorders time and time again. Talk of Asperger's, SPD, allergies/eczema, social skills difficulties, left handedness, assorted sensitivities is common.