There's no direct link I've read about. From personal experience, having DRD increases the risk of being diagnosed with Alzheimer's, which happened to my grandma about 20 years ago, but that's just because some of the symptoms are very general, and it's especially hard to tease out with co-morbid conditions that may have some overlap.

Parkinsons seems to be more likely than Alzheimer's since dopamine plays a big part in parkinsons.