Why Are Single-Nucleotide Polymorphisms (SNPs), Which Have Been Associated with Schizophrenia

Why are single-nucleotide polymorphisms (SNPs) , which have been associated with schizophrenia and bipolar disorder, currently not used to diagnose either of these disorders?

A) The changes in gene activity caused by the SNPs is not sufficient to cause disease expression.
B) SNPs are associated with nicotine dependence but not with schizophrenia or bipolar disorder.
C) The SNPs are too small to result in either a frameshift mutation or a point mutation.
D) These SNP-induced gene changes cannot be altered by pharmacologic therapy.

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