Maybe genes don't determine many diseases after all

This article in today's New York Times:

Genes show limited value in predicting diseases

Supports my longstanding suspicion of claims that certain diseases (depression, autism, schizophrenia, etc) were caused by genetic defects.  It always seemed to me that if a disease truly was caused by a genetic variation then the expression of the disease would follow simple Mendelian rules, like is the case with Huntington's Disease or Tay Sachs disease.  And my skepticism increased when the years and decades went by without indentifying the specific culprit genes for various diseases that were attributed to genetics.

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