This is a very nice study tying in latidude, vitamin D ( (whose synthesis depends on sunlight ), and genes in schizophrenia.
Vitamin D deficiency both pre- and postnatally has been associated with schizophrenia, and many other conditons (see posts and Pubmed feed )
Factors such as these no doubt account for the skewed geographical distribution of schizophrenia . The distribution map is from Wikipedia schizophrenia
They may also explain the clustering of positive and negative gene association data observed in schizophreia (and Alzheimer's disease ) See website
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