Table 1.

Importance of microRNAs subject to this review

MicroRNA	Psychiatric disorder	Importance
miR-320	Major depression	miR-320 family may be important as a peripheral biomarker
	Autism	miR-320 was dysregulated in lymphoblastoid cell lines of autism patients
miR-106	Major depression	miR-106a-5p levels was higher in depressed patients
	Schizophrenia	miR-106b-5p levels was higher in schizophrenia patients
	Attention deficit hyperactivity disorder	Lower miR-106b-5p levels were determined in the control group
	Autism	miR-106-5p showed higher expression in autism
miR-34	Major depression	miR-34b-5p and miR-34c-5p levels in peripheral blood leukocytes were closely related to suicide idea and cognitive function
	Schizophrenia	miR-34 were presented as peripheral biomarkers
	Bipolar disorder	miR34-a may be critical for bipolar disorder in terms of neurodevelopment
	Alzheimer’s disease	miR-34a was observed to be decreased in plasma and cerebrospinal fluid according to the control group
miR-223	Major depression	miR-223-3p levels were reported to be significantly higher in patients than in controls
	Posttraumatic stress disorder	miR-223 could be a potential biomarker
miR-107	Amnestic mild cognitive impairment	miR107 expressions in plasma had a high capability to distinguish individuals with amnestic mild cognitive impairment from healthy controls
	Major depression	Positive correlation between N1, P2latency of P300 and miR-107 in depressed patients
miR-134	Mild cognitive impairment	miRNA biomarker pairs successfully detected MCI in most of the patients at asymptomatic stage
	Bipolar disorder	Decreased miR-134 level was directly associated with bipolar disorder