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Decreased vagal modulation, which has consistently been observed in schizophrenic patients, might contribute to increased cardiac mortality in schizophrenia. Previously, associations between  CHRM2  (Cholinergic Receptor Muscarinic 2) and cardiac autonomic features have been reported. Here, we tested for possible associations between these polymorphisms and heart rate variability in patients with schizophrenia. A total of three single nucleotide polymorphisms (SNPs) in  CHRM2  (rs73158705 A&gt;G, rs8191992 T&gt;A and rs2350782 T&gt;C) that achieved significance ( p  &lt; 5 * 10 −8 ) in genome-wide association studies for cardiac autonomic features were genotyped in 88 drug-naïve patients, 61 patients receiving antipsychotic medication and 144 healthy controls. Genotypes were analysed for associations with parameters of heart rate variability and complexity, in each diagnostic group. We observed a significantly altered heart rate variability in unmedicated patients with identified genetic risk status in rs73158705 A&gt;G, rs8191992 T&gt;A and rs2350782 T&gt;C as compared to genotype non-risk status. In patients receiving antipsychotic medication and healthy controls, these associations were not observed. We report novel candidate genetic associations with cardiac autonomic dysfunction in schizophrenia, but larger cohorts are required for replication.

the world journal of biological psychiatry

Associations of common genetic risk variants of the muscarinic acetylcholine receptor M2 with cardiac autonomic dysfunction in patients with schizophrenia