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A growing body of evidence suggests that mitochondrial function may be important in brain development and psychiatric disorders. However, detailed expression profiles of those genes in human brain development and fear-related behavior remain unclear. Using microarray data available from the public domain and the Gene Ontology analysis, we identified the genes and the functional categories associated with chronological age in the prefrontal cortex (PFC) and the caudate nucleus (CN) of psychiatrically normal humans ranging in age from birth to 50 years. Among those, we found that a substantial number of genes in the PFC (115) and the CN (117) are associated with the GO term: mitochondrion (FDR qv <0.05). A greater number of the genes in the PFC (91%) than the genes in the CN (62%) showed a linear increase in expression during postnatal development. Using quantitative PCR, we validated the developmental expression pattern of four genes including monoamine oxidase B ( MAOB ), NADH dehydrogenase flavoprotein ( NDUFV1 ), mitochondrial uncoupling protein 5 ( SLC25A14 ) and tubulin beta-3 chain ( TUBB3 ). In mice, overall developmental expression pattern of  MAOB, SLC25A14  and  TUBB3  in the PFC were comparable to the pattern observed in humans (p<0.05). However, mice selectively bred for high fear did not exhibit normal developmental changes of  MAOB  and  TUBB3 . These findings suggest that the genes associated with mitochondrial function in the PFC play a significant role in brain development and fear-related behavior.

plos one

Expression Profiles of Mitochondrial Genes in the Frontal Cortex and the Caudate Nucleus of Developing Humans and Mice Selectively Bred for High and Low Fear