Research methodology and looking for alternative correlations

The genetics and dancers research started me thinking about this. So the
authors tested their hypothesis that there's a genetic association with
professional dancers and it turned out to be true. The association was
more than for professional athletes and the control group.

When I think of genetics I think of something that happens over a long
period of time whereas society changes quickly. Genes that have evolved
'selfishly' (according the the game theory mathematics used on gene
evolution science) but the time in which the societies in which they
express are different geographically and temporally.

Genes can also be associated with higher associations with other
phenotypes other than those studies. The research is limited by the
imagination of the authors, so they could have also chosen to add a drug
user group, serious amateur dancers and religious dancers. The last
category may have had a higher association with the gene and a
significantly higher association in Africa or five hundred years ago.

The controls are also interesting. They've just assumed to be this
random mass of homogeneous entities that provide a standard measure.
Within the control group there would be people who also had this gene
but weren't professional dancers. Understanding how the gene expressed
in their profession and/or understanding how the behaviour expressed in
other ways would provide a better understanding of the relationship
between genotype and phenotype than the research on genetics and dancing
published in PloS Medicine.

Genetics applied to mental health is fascinating. It often forgets that
the 'disease' hasn't always been a disease nor will it always be
considered as a disease. It's just behaviour, emotions and experiences
of consciousness. The reliability and validity of the labels is pretty
poor but disappears into the reliability and validity of astrology when
used in clinical practice or outside the most rigorous clinical trials.
Other factors also have a huge influence on the individual's
presentation of a supposed mental illness. Genetics may work with ease
with physical diseases just as positivistic science also seems to work
well however in mental health the science isn't really there to form a
grounding for the genetic evidence to be truly understood and the
variables and considerably larger and less well understood. I hope that
presents a challenge to the scientists working in this field rather than
something they'd dismiss as not true.