Correlation between altered levels of neurotransmitters in the frontal lobe and hippocampus and behavioral abnormalities in a Clock mutant mice modeling bipolar manic disorder / 中华医学遗传学杂志

OBJECTIVE@#To explore the correlation between altered levels of neurotransmitters in the frontal lobe and hippocampus and behavioral abnormalities in a Clock variant mice modeling bipolar disorder manic disorder.@*METHODS@#Open field test and Elevated plus-maze test were carried out on the Clock mutant and wild-type control groups. The frontal lobe and hippocampus of Clock mutant mice and controls were dissected, and neurotransmitters in tissue extracts were analyzed by high-performance liquid chromatography and mass spectrometry. The concentration of neurotransmitters and behavioral indicators were assessed by t test and Pearson correlation analysis using SPSS 22.0.@*RESULTS@#The Clock mutant mice showed a significant increase in activity, albeit with no difference in the level of anxiety from the wild-type controls, which suggested that the Clock mutant mice can be used as a model for manic attack of bipolar disorder. Altered neurotransmitter levels were detected in the frontal and hippocampal regions, including elevated histamine in the left hippocampus, reduced histamine in the right hippocampus, reduced gamma-aminobutyric acid (GABA) in bilateral hippocampus, elevated dihydroxyphenylalanine (DOPA) in the left frontal lobe and reduced DOPA in the right hippocampus, and decreased glutamine in bilateral frontal lobes. The reduced glutamine in the left frontal lobe and GABA in the right hippocampus correlated with the increased activity of Clock mutant mice.@*CONCLUSION@#Clock mutant mice showed abnormal behavior with increased activity. Reduced glutamine in the left frontal lobe and GABA in the right hippocampus were correlated with increased activity.

Pathway-focused correlation study of genome-wide methylation status with visual memory / 中华医学遗传学杂志

OBJECTIVE To explore the biological processes and pathways associated with memory function which may be regulated by gene promoter methylation. METHODS The genome-wide promoter methylation statuses in 9 healthy individuals were analyzed with a Multiplex HG18 CpG Promoter chip. Genes with promoter methylation statuses strongly correlated with both immediate and delayed visual memory function were preceded for pathway and physical interactions analysis. RESULTS Sixty nine genes have been correlated with both immediate and delayed visual memory functions. Twenty two pathways, with a Q-value of < 0.05, were identified by the pathway and physical interactions analysis, which included energy metabolism, axon guidance, tyrosine kinase activity, anterograde synaptic vesicle transport, and leukocyte migration and differentiation. CONCLUSION Pathways related with memory function may be regulated by DNA methylation.

Association of gender, age, education and polymorphism of DRD4 gene with cognitive functions in adults / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To assess the association of cognitive functions with gender, age, education and polymorphism of dopamine receptor D4 (DRD4) gene in healthy adults.</p><p><b>METHODS</b>Four hundred and fifty-five healthy participants have completed 3 cognitive function tests including Tower of Hanoi (TOH), Wisconsin Card Sorting Test (WCST) and Trail Making Test (TMT). Peripheral blood samples were collected from all participants, and genomic DNA was extracted according to a standard phenol-chloroform procedure. Rs3758653 in the promoter region of the DRD4 gene was genotyped using Illumina GoldenGate genotyping assay.</p><p><b>RESULTS</b>Males have performed better than females in terms of TOH executive time and TOH total score, but did worse in TOH planning time. Most of the measured cognitive domains were affected by age and education. Cognitive ability has decreased along with increased age and decline of educational years. The polymorphism of rs3758653 has mainly correlated with the TOH executive time. Compared with A allele carriers, G allele carriers did worse in TOH executive time.</p><p><b>CONCLUSION</b>Gender, age, education and the rs3758653 polymorphism of the DRD4 gene play an important role in cognitive functions in healthy adults.</p>