Q. Nguyen, E. Rodrigues, M. Farah, W. Mieler, D. Do, O. Michielin, G. Coukos, G. Coscas, J. Cunha-Vaz, A. Loewenstein, G. Soubrane, K. Priftis, M. Anthracopoulos, D. Mathalon, T. Petryshen, M. Picciotto
{"title":"Front & Back Matter","authors":"Q. Nguyen, E. Rodrigues, M. Farah, W. Mieler, D. Do, O. Michielin, G. Coukos, G. Coscas, J. Cunha-Vaz, A. Loewenstein, G. Soubrane, K. Priftis, M. Anthracopoulos, D. Mathalon, T. Petryshen, M. Picciotto","doi":"10.1159/000452644","DOIUrl":"https://doi.org/10.1159/000452644","url":null,"abstract":"","PeriodicalId":18957,"journal":{"name":"Molecular Neuropsychiatry","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91085366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Nishimura, Y. Kawakubo, M. Suga, K. Hashimoto, Y. Takei, K. Takei, H. Inoue, M. Yumoto, R. Takizawa, K. Kasai
{"title":"Familial Influences on Mismatch Negativity and Its Association with Plasma Glutamate Level: A Magnetoencephalographic Study in Twins","authors":"Y. Nishimura, Y. Kawakubo, M. Suga, K. Hashimoto, Y. Takei, K. Takei, H. Inoue, M. Yumoto, R. Takizawa, K. Kasai","doi":"10.1159/000449426","DOIUrl":"https://doi.org/10.1159/000449426","url":null,"abstract":"Mismatch negativity (MMN) or its magnetic counterpart (magnetic mismatch negativity; MMNm) is regarded as a promising biomarker for schizophrenia. Previous electroencephalographic studies of MMN have demonstrated a moderate-to-high heritability for MMN amplitudes. N-methyl-D-aspartate receptor-dependent glutamatergic neurotransmission is implicated in MMN generation. We hypothesized that the differences between identical twins in MMNm variables might be associated with differences in plasma levels of amino acids involved in glutamatergic neurotransmission. Thirty-three pairs of monozygotic (MZ) and 10 pairs of dizygotic (DZ) twins underwent MMNm recording. The MMNm in response to tone duration changes, tone frequency changes, and phonemic changes was recorded using 204-channel magnetoencephalography. Of these, 26 MZ and 7 DZ twin pairs underwent blood sampling for determination of plasma amino acid levels. MMNm peak strength showed relatively high correlations in both MZ and DZ twin pairs. The differences in MMNm latencies tended to correlate with the differences in plasma amino acid levels within MZ pairs, while no significant correlation was observed after the Bonferroni correction. We observed a familial trait in MMNm strength. The differences in MMN latency in MZ twins might be influenced by changes in glutamate levels and glutamate-glutamine cycling; however, the results need to be replicated.","PeriodicalId":18957,"journal":{"name":"Molecular Neuropsychiatry","volume":"19 1","pages":"161 - 172"},"PeriodicalIF":0.0,"publicationDate":"2016-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89981890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tyler B. Grove, K. Burghardt, A. Kraal, Ryan J. Dougherty, S. Taylor, V. Ellingrod
{"title":"Oxytocin Receptor (OXTR) Methylation and Cognition in Psychotic Disorders","authors":"Tyler B. Grove, K. Burghardt, A. Kraal, Ryan J. Dougherty, S. Taylor, V. Ellingrod","doi":"10.1159/000448173","DOIUrl":"https://doi.org/10.1159/000448173","url":null,"abstract":"Previous reports have identified an association between cognitive impairment and genetic variation in psychotic disorders. In particular, this association may be related to abnormal regulation of genes responsible for broad cognitive functions such as the oxytocin receptor (OXTR). Within psychotic disorders, it is unknown if OXTR methylation, which can have important implications for gene regulation, is related to cognitive function. The current study examined peripheral blood OXTR methylation and general cognition in people with schizophrenia, schizoaffective disorder, and psychotic disorder not otherwise specified (N = 101). Using hierarchical multiple regression analysis, methylation at the Chr3:8767638 site was significantly associated with composite cognitive performance independent of demographic and medication factors while controlling for multiple testing in this combined diagnostic sample (adjusted p = 0.023).","PeriodicalId":18957,"journal":{"name":"Molecular Neuropsychiatry","volume":"91 1","pages":"151 - 160"},"PeriodicalIF":0.0,"publicationDate":"2016-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83373925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jessica Ross, Erika Gedvilaite, J. Badner, C. Erdman, L. Baird, N. Matsunami, M. Leppert, Jinchuan Xing, W. Byerley
{"title":"A Rare Variant in CACNA1D Segregates with 7 Bipolar I Disorder Cases in a Large Pedigree","authors":"Jessica Ross, Erika Gedvilaite, J. Badner, C. Erdman, L. Baird, N. Matsunami, M. Leppert, Jinchuan Xing, W. Byerley","doi":"10.1159/000448041","DOIUrl":"https://doi.org/10.1159/000448041","url":null,"abstract":"Whole-genome sequencing was performed on 3 bipolar I disorder (BPI) cases from a multiplex pedigree of European ancestry with 7 BPI cases. Within CACNA1D, a gene implicated by genome-wide association studies, a G to C nucleotide transversion at 53,835,340 base pairs (bps) was found predicting the substitution of proline for alanine at amino acid position 1751 (A1751P). Using Sanger sequencing, the DNA variant was shown to co-segregate with the remaining 4 BPI cases within the pedigree. A high-resolution DNA denaturing curve method was then used to screen for the presence of the A1751P change in 4,150 BPI cases from the NIMH Genetics Initiative. The A1751P variant was found in 4 BPI cases. A second variant within exon 43, a C to T nucleotide transition, was found in 1 case at 53,835,355 bps, predicting the substitution of tryptophan for arginine at amino acid position 1771 (R1771W). In the NHLBI Exome Sequencing Project database, the heterozygous A1751P variant was present in 3 of 4,300 subjects of European ancestry, and the R1771W change was not present in any subject. Given the rarity of these variants, large-scale case/control rare variant sequencing studies will be required for definitive conclusions.","PeriodicalId":18957,"journal":{"name":"Molecular Neuropsychiatry","volume":"23 1","pages":"145 - 150"},"PeriodicalIF":0.0,"publicationDate":"2016-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80039414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Nucifora, Yee‐Wen Candace Wu, Brian J. Lee, L. Sha, R. Margolis, C. Ross, A. Sawa, F. C. Nucifora Jr
{"title":"A Mutation in NPAS3 That Segregates with Schizophrenia in a Small Family Leads to Protein Aggregation","authors":"L. Nucifora, Yee‐Wen Candace Wu, Brian J. Lee, L. Sha, R. Margolis, C. Ross, A. Sawa, F. C. Nucifora Jr","doi":"10.1159/000447358","DOIUrl":"https://doi.org/10.1159/000447358","url":null,"abstract":"Schizophrenia and other major mental illnesses result from a complex interplay of genetic and environmental factors. We previously identified a mutation in NPAS3 that results in a valine to isoleucine (V304I) amino acid substitution segregating with schizophrenia in a small family. The amino acid change occurs in a potentially critical region for protein function. Furthermore, the same amino acid substitution in proteins related to familial Alzheimer's disease and transthyretin amyloidosis has been associated with protein aggregation. In this study, we demonstrate that NPAS3 is prone to aggregation, and that the V304I mutation in NPAS3 increases this propensity in both bacterial and mammalian expression systems. We also show that NPAS3-V304I reduces soluble endogenous NPAS3, and increases insoluble endogenous NPAS3 and leads to alteration of transcriptional activity. These results suggest that protein aggregation, potentially leading to cell dysfunction via a loss of protein function through sequestration, may contribute to the pathogenesis of schizophrenia and other forms of mental illness. Further exploration of the mechanisms leading to abnormal protein quality control could lead to new therapeutic targets.","PeriodicalId":18957,"journal":{"name":"Molecular Neuropsychiatry","volume":"23 1","pages":"133 - 144"},"PeriodicalIF":0.0,"publicationDate":"2016-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82173890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Morita, Yanyan Wang, T. Sasaoka, Kinya Okada, M. Niwa, A. Sawa, T. Hikida
{"title":"Dopamine D2L Receptor Is Required for Visual Discrimination and Reversal Learning","authors":"M. Morita, Yanyan Wang, T. Sasaoka, Kinya Okada, M. Niwa, A. Sawa, T. Hikida","doi":"10.1159/000447970","DOIUrl":"https://doi.org/10.1159/000447970","url":null,"abstract":"The corticostriatothalamic circuit regulates learning behaviors via dopamine neurotransmission. D2 long (D2L) receptors are an isoform of dopamine D2 receptors (D2Rs) and may act mainly at postsynaptic sites. It is well known that D2Rs influence high brain functions, but the roles of individual D2R isoforms are still unclear. To assess the influence of D2L receptors in visual discrimination learning, we performed visual discrimination and reversal tasks with D2L knockout mice using a touchscreen operant system. There were no significant differences in an operant conditioning task between genotypes. However, D2L knockout mice were impaired in both visual discrimination and reversal learning tasks. D2L knockout mice were also significantly slower than wild-type mice in collecting the reward in the visual discrimination task. These results indicate that D2L receptors play an important role in visual discrimination and reversal learning.","PeriodicalId":18957,"journal":{"name":"Molecular Neuropsychiatry","volume":"27 1","pages":"124 - 132"},"PeriodicalIF":0.0,"publicationDate":"2016-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79719568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Genetics of Common Antipsychotic-Induced Adverse Effects.","authors":"Raymond R MacNeil, Daniel J Müller","doi":"10.1159/000445802","DOIUrl":"https://doi.org/10.1159/000445802","url":null,"abstract":"<p><p>The effectiveness of antipsychotic drugs is limited due to accompanying adverse effects which can pose considerable health risks and lead to patient noncompliance. Pharmacogenetics (PGx) offers a means to identify genetic biomarkers that can predict individual susceptibility to antipsychotic-induced adverse effects (AAEs), thereby improving clinical outcomes. We reviewed the literature on the PGx of common AAEs from 2010 to 2015, placing emphasis on findings that have been independently replicated and which have additionally been listed to be of interest by PGx expert panels. Gene-drug associations meeting these criteria primarily pertain to metabolic dysregulation, extrapyramidal symptoms (EPS), and tardive dyskinesia (TD). Regarding metabolic dysregulation, results have reaffirmed HTR2C as a strong candidate with potential clinical utility, while MC4R and OGFR1 gene loci have emerged as new and promising biomarkers for the prediction of weight gain. As for EPS and TD, additional evidence has accumulated in support of an association with CYP2D6 metabolizer status. Furthermore, HSPG2 and DPP6 have been identified as candidate genes with the potential to predict differential susceptibility to TD. Overall, considerable progress has been made within the field of psychiatric PGx, with inroads toward the development of clinical tools that can mitigate AAEs. Going forward, studies placing a greater emphasis on multilocus effects will need to be conducted. </p>","PeriodicalId":18957,"journal":{"name":"Molecular Neuropsychiatry","volume":"2 2","pages":"61-78"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1159/000445802","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34371975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Christina M Hough, F Saverio Bersani, Synthia H Mellon, Elissa S Epel, Victor I Reus, Daniel Lindqvist, Jue Lin, Laura Mahan, Rebecca Rosser, Heather Burke, John Coetzee, J Craig Nelson, Elizabeth H Blackburn, Owen M Wolkowitz
{"title":"Leukocyte telomere length predicts SSRI response in major depressive disorder: A preliminary report.","authors":"Christina M Hough, F Saverio Bersani, Synthia H Mellon, Elissa S Epel, Victor I Reus, Daniel Lindqvist, Jue Lin, Laura Mahan, Rebecca Rosser, Heather Burke, John Coetzee, J Craig Nelson, Elizabeth H Blackburn, Owen M Wolkowitz","doi":"10.1159/000446500","DOIUrl":"https://doi.org/10.1159/000446500","url":null,"abstract":"<p><p>Short leukocyte telomere length (LTL) may be associated with several psychiatric disorders, including major depressive disorder (MDD). Short LTL has previously been associated with poor response to psychiatric medications in bipolar disorder and schizophrenia, but no studies have prospectively assessed the relationship of LTL to SSRI response in MDD. We assessed pre-treatment LTL, depression severity (using the Hamilton Depression Rating Scale [HDRS]), and self-reported positive and negative affect in 27 healthy, unmedicated adults with MDD. Subjects then underwent open-label treatment with a selective serotonin reuptake inhibitor (SSRI) antidepressant for eight weeks, after which clinical ratings were repeated. Analyses were corrected for age, sex and BMI. \"Non-responders\" to treatment (HDRS improvement <50%) had significantly shorter pre-treatment LTL, compared to \"Responders\" (p=0.037). Further, shorter pre-treatment LTL was associated with less improvement in negative affect (p<0.010) but not with changes in positive affect (p=0.356). This preliminary study is the first to assess the relationship between LTL and SSRI response in MDD and among the first to prospectively assess its relationship to treatment outcome in any psychiatric illness. Our data suggest that short LTL may serve as a vulnerability index of poorer response to SSRI treatment, but this needs examination in larger samples.</p>","PeriodicalId":18957,"journal":{"name":"Molecular Neuropsychiatry","volume":"2 2","pages":"88-96"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1159/000446500","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34581646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Joanne H Huang, Shaunna S Berkovitch, Jonathan Iaconelli, Bradley Watmuff, Hyoungjun Park, Shrikanta Chattopadhyay, Donna McPhie, Dost Öngür, Bruce M Cohen, Clary B Clish, Rakesh Karmacharya
{"title":"Perturbational Profiling of Metabolites in Patient Fibroblasts Implicates α-Aminoadipate as a Potential Biomarker for Bipolar Disorder.","authors":"Joanne H Huang, Shaunna S Berkovitch, Jonathan Iaconelli, Bradley Watmuff, Hyoungjun Park, Shrikanta Chattopadhyay, Donna McPhie, Dost Öngür, Bruce M Cohen, Clary B Clish, Rakesh Karmacharya","doi":"10.1159/000446654","DOIUrl":"https://doi.org/10.1159/000446654","url":null,"abstract":"<p><p>Many studies suggest the presence of aberrations in cellular metabolism in bipolar disorder. We studied the metabolome in bipolar disorder to gain insight into cellular pathways that may be dysregulated in bipolar disorder and to discover evidence of novel biomarkers. We measured polar and nonpolar metabolites in fibroblasts from subjects with bipolar I disorder and matched healthy control subjects, under normal conditions and with two physiologic perturbations: low-glucose media and exposure to the stress-mediating hormone dexamethasone. Metabolites that were significantly different between bipolar and control subjects showed distinct separation by principal components analysis methods. The most statistically significant findings were observed in the perturbation experiments. The metabolite with the lowest p value in both the low-glucose and dexamethasone experiments was α-aminoadipate, whose intracellular level was consistently lower in bipolar subjects. Our study implicates α-aminoadipate as a possible biomarker in bipolar disorder that manifests under cellular stress. This is an intriguing finding given the known role of α-aminoadipate in the modulation of kynurenic acid in the brain, especially as abnormal kynurenic acid levels have been implicated in bipolar disorder. </p>","PeriodicalId":18957,"journal":{"name":"Molecular Neuropsychiatry","volume":"2 2","pages":"97-106"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1159/000446654","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34371977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}