Over 600 genes have been implicated in schizophrenia, subscribing to the idea of "multiple genes of small effect". These genes can be related to each other and together etch out signalling networks that are very relevant to the disease, as can be seen at http://www.polygenicpathways.co.uk/keggszgenes.htm
Pathway analysis of GWAS studies is very much in vogue and this type of analysis can be very useful in deciphering the genetic jumble.
There is just a new publication looking at GWAS data for schizophrenia, Arnedo et al., Am J Psychiatry 2014 Sep 15. doi: 10.1176/appi.ajp.2014.14040435. [Epub ahead of print]
Uncovering the Hidden Risk Architecture of the Schizophrenias: Confirmation in Three Independent Genome-Wide Association Studies.
This might help to decipher the genetic jumble.
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