Abstract
Genetic perturbations in dopamine neurotransmission and calcium signaling pathways are implicated in the etiology of schizophrenia. We aimed to test the association of a functional splice variant each in Dopamine β-Hydroxylase (DBH; rs1108580) and Calcium voltage-gated channel subunit alpha1 C (CACNA1C; rs1006737) genes in these pathways with schizophrenia (506 cases, 443 controls); Abnormal Involuntary Movement Scale (AIMS) scores in subjects assessed for tardive dyskinesia (76 TD-positive, 95 TD-negative) and Penn Computerized Neurocognitive Battery (PennCNB) scores (334 cases, 234 controls). The effect of smoking status and SNP genotypes on AIMS scores were assessed using ANOVA; health status and SNP genotypes on three performance functions of PennCNB cognitive domains were assessed by ANCOVA with age and sex as covariates. Association with Positive and Negative Syndrome Scale (PANSS) scores in the TD cohort and cognitive scores in healthy controls of the cognition cohort were tested by linear regression. None of the markers were associated with schizophrenia. Smoking status [F(2, 139) = 10.6; p = 5 × 10−5], rs1006737 [F(2, 139) = 7.1; p = 0.001], TD status*smoking [F(2, 139) = 8.0; p = 5.0 × 10−4] and smoking status*rs1006737 [F(4, 139) = 2.7; p = 0.03] had an effect on AIMS score. Furthermore, rs1006737 was associated with orofacial [F(2, 139) = 4.6; p = 0.01] and limb-truncal TD [(F(2, 139) = 3.8; p = 0.02]. Main effect of rs1108580 on working memoryprocessing speed [F(2, 544) = 3.8; p = 0.03] and rs1006737 on spatial abilityefficiency [F(1, 550) = 9.4; p = 0.02] was identified. Health status*rs1006737 interaction had an effect on spatial memoryprocessing speed [F(1, 550) = 6.9; p = 0.01]. Allelic/genotypic association (p = 0.01/0.03) of rs1006737 with disorganized/concrete factor and allelic association of rs1108580 (p = 0.04) with a depressive factor of PANSS was observed in the TD-negative subcohort. Allelic association of rs1006737 with sensorimotor dexterityaccuracy (p = 0.03), attentionefficiency (p = 0.05), and spatial abilityefficiency (p = 0.02); allelic association of rs1108580 with face memoryaccuracy (p = 0.05) and emotionefficiency (p = 0.05); and allelic/genotypic association with emotionaccuracy (p = 0.003/0.009) were observed in healthy controls of the cognition cohort. These association findings may have direct implications for personalized medicine and cognitive remediation.
Similar content being viewed by others
Data Availability
All data generated or analyzed during this study are included in this published article [and its supplementary information files].
References
Howes OD, Kapur S (2009) The dopamine hypothesis of schizophrenia: version III – the final common pathway. Schizophr Bull 35(3):549–562. https://doi.org/10.1093/schbul/sbp006
Berridge MJ (2014) Calcium signalling and psychiatric disease: bipolar disorder and schizophrenia. Cell Tissue Res 357(2):477–492. https://doi.org/10.1007/s00441-014-1806-z
Cubells JF, Zabetian CP (2004) Human genetics of plasma dopamine beta-hydroxylase activity: applications to research in psychiatry and neurology. Psychopharmacology (Berl) 174(4):463–476. https://doi.org/10.1007/s00213-004-1840-8
Gonzalez-Lopez E, Vrana KE (2019) Dopamine beta-hydroxylase and its genetic variants in human health and disease. J Neurochem. https://doi.org/10.1111/jnc.14893
Punchaichira TJ, Prasad S, Deshpande SN, Thelma BK (2016) Deep sequencing identifies novel regulatory variants in the distal promoter region of the dopamine-beta-hydroxylase gene. Pharmacogenet Genomics 26(7):311–323. https://doi.org/10.1097/FPC.0000000000000214
Punchaichira TJ, Dey SK, Mukhopadhyay A, Kundu S, Thelma BK (2017) Characterization of SNPs in the dopamine-beta-hydroxylase gene providing new insights into its structure-function relationship. Neurogenetics 18(3):155–168
Punchaichira TJ, Deshpande SN, Thelma BK (2018) Determination of dopamine-beta-hydroxylase activity in human serum using UHPLC-PDA detection. Neurochem Res 43(12):2324–2332. https://doi.org/10.1007/s11064-018-2653-1
Yamamoto K, Cubells JF, Gelernter J, Benkelfat C, Lalonde P, Bloom D, Lal S, Labelle A, Turecki G, Rouleau GA, Joober R (2003) Dopamine beta-hydroxylase (DBH) gene and schizophrenia phenotypic variability: a genetic association study. Am J Med Genet B Neuropsychiatr Genet 117B(1):33–38. https://doi.org/10.1002/ajmg.b.10011
Barrie ES, Weinshenker D, Verma A, Pendergrass SA, Lange LA, Ritchie MD, Wilson JG, Kuivaniemi H, Tromp G, Carey DJ, Gerhard GS, Brilliant MH, Hebbring SJ, Cubells JF, Pinsonneault JK, Norman GJ, Sadee W (2014) Regulatory polymorphisms in human DBH affect peripheral gene expression and sympathetic activity. Circ Res 115(12):1017–1025. https://doi.org/10.1161/CIRCRESAHA.116.304398
Srivastava V, Deshpande SN, Thelma BK (2010) Dopaminergic pathway gene polymorphisms and genetic susceptibility to schizophrenia among north Indians. Neuropsychobiology 61(2):64–70. https://doi.org/10.1159/000265131
Kobayashi K, Kurosawa Y, Fujita K, Nagatsu T (1989) Human dopamine beta-hydroxylase gene: two mRNA types having different 3'-terminal regions are produced through alternative polyadenylation. Nucleic Acids Res 17(3):1089–1102
Sun Z, Ma Y, Li W, He J, Li J, Yang X, Mao P, Cubells JF, Tang YL (2018) Associations between the DBH gene, plasma dopamine beta-hydroxylase activity and cognitive measures in Han Chinese patients with schizophrenia. Schizophr Res 193:58–63. https://doi.org/10.1016/j.schres.2017.06.028
Chamberlain SR, Robbins TW (2013) Noradrenergic modulation of cognition: therapeutic implications. J Psychopharmacol 27(8):694–718. https://doi.org/10.1177/0269881113480988
Punchaichira TJ, Mukhopadhyay A, Kukshal P, Bhatia T, Deshpande SN, Thelma BK (2020) Association of regulatory variants of dopamine beta-hydroxylase with cognition and tardive dyskinesia in schizophrenia subjects. J Psychopharmacol 34(3):358–369. https://doi.org/10.1177/0269881119895539
Dolmetsch RE, Pajvani U, Fife K, Spotts JM, Greenberg ME (2001) Signaling to the nucleus by an L-type calcium channel-calmodulin complex through the MAP kinase pathway. Science 294(5541):333–339. https://doi.org/10.1126/science.1063395
Gershon ES, Grennan K, Busnello J, Badner JA, Ovsiew F, Memon S, Alliey-Rodriguez N, Cooper J, Romanos B, Liu C (2014) A rare mutation of CACNA1C in a patient with bipolar disorder, and decreased gene expression associated with a bipolar-associated common SNP of CACNA1C in brain. Mol Psychiatry 19(8):890–894. https://doi.org/10.1038/mp.2013.107
Nyegaard M, Demontis D, Foldager L, Hedemand A, Flint TJ, Sorensen KM, Andersen PS, Nordentoft M, Werge T, Pedersen CB, Hougaard DM, Mortensen PB, Mors O, Borglum AD (2010) CACNA1C (rs1006737) is associated with schizophrenia. Mol Psychiatry 15(2):119–121. https://doi.org/10.1038/mp.2009.69
Bhat S, Dao DT, Terrillion CE, Arad M, Smith RJ, Soldatov NM, Gould TD (2012) CACNA1C (Cav1.2) in the pathophysiology of psychiatric disease. Prog Neurobiol 99(1):1–14. https://doi.org/10.1016/j.pneurobio.2012.06.001
Ripke S, O'Dushlaine C, Chambert K, Moran JL, Kahler AK, Akterin S, Bergen SE, Collins AL et al (2013) Genome-wide association analysis identifies 13 new risk loci for schizophrenia. Nat Genet 45(10):1150–1159. https://doi.org/10.1038/ng.2742
Erk S, Meyer-Lindenberg A, Linden DEJ, Lancaster T, Mohnke S, Grimm O, Degenhardt F, Holmans P et al (2014) Replication of brain function effects of a genome-wide supported psychiatric risk variant in the CACNA1C gene and new multi-locus effects. Neuroimage 94:147–154. https://doi.org/10.1016/j.neuroimage.2014.03.007
Yoshimizu T, Pan JQ, Mungenast AE, Madison JM, Su S, Ketterman J, Ongur D, McPhie D et al (2015) Functional implications of a psychiatric risk variant within CACNA1C in induced human neurons. Mol Psychiatry 20(2):284. https://doi.org/10.1038/mp.2014.181
Mallas E, Carletti F, Chaddock CA, Shergill S, Woolley J, Picchioni MM, McDonald C, Toulopoulou T, Kravariti E, Kalidindi S, Bramon E, Murray R, Barker GJ, Prata DP (2017) The impact of CACNA1C gene, and its epistasis with ZNF804A, on white matter microstructure in health, schizophrenia and bipolar disorder(1). Genes Brain Behav 16(4):479–488. https://doi.org/10.1111/gbb.12355
Tecelao D, Mendes A, Martins D, Fu C, Chaddock CA, Picchioni MM, McDonald C, Kalidindi S, Murray R, Prata DP (2019) The effect of psychosis associated CACNA1C, and its epistasis with ZNF804A, on brain function. Genes Brain Behav 18(4):e12510. https://doi.org/10.1111/gbb.12510
Zhu D, Yin J, Liang C, Luo X, Lv D, Dai Z, Xiong S, Fu J, Li Y, Lin J, Lin Z, Wang Y, Ma G (2019) CACNA1C (rs1006737) may be a susceptibility gene for schizophrenia: an updated meta-analysis. Brain Behav 9(6):e01292. https://doi.org/10.1002/brb3.1292
Stilo SA, Murray RM (2019) Non-genetic factors in schizophrenia. Curr Psychiatry Rep 21(10):100. https://doi.org/10.1007/s11920-019-1091-3
Quigley H, MacCabe JH (2019) The relationship between nicotine and psychosis. Ther Adv Psychopharmacol 9:2045125319859969. https://doi.org/10.1177/2045125319859969
Peterson RE, Bigdeli TB, Ripke S, Bacanu SA, Gejman PV, Levinson DF, Li QS, Rujescu D et al (2021) Genome-wide analyses of smoking behaviors in schizophrenia: findings from the psychiatric genomics consortium. J Psychiatr Res 137:215–224. https://doi.org/10.1016/j.jpsychires.2021.02.027
Tiwari AK, Deshpande SN, Rao AR, Bhatia T, Lerer B, Nimgaonkar VL, Thelma BK (2005) Genetic susceptibility to tardive dyskinesia in chronic schizophrenia subjects: III. Lack of association of CYP3A4 and CYP2D6 gene polymorphisms. Schizophr Res 75(1):21–26. https://doi.org/10.1016/j.schres.2004.12.011
Deshpande SN, Mathur MN, Das SK, Bhatia T, Sharma S, Nimgaonkar VL (1998) A Hindi version of the diagnostic interview for genetic studies. Schizophr Bull 24(3):489–493
Nurnberger JI Jr, Blehar MC, Kaufmann CA, York-Cooler C, Simpson SG, Harkavy-Friedman J, Severe JB, Malaspina D, Reich T (1994) Diagnostic interview for genetic studies. Rationale, unique features, and training. NIMH Genetics Initiative. Arch Gen Psychiatry 51(11):849–859 discussion 863-844
Schooler NR, Kane JM (1982) Research diagnoses for tardive dyskinesia. Arch Gen Psychiatry 39(4):486–487
Guy W (1976) National institute of mental health (U.S.). Psychopharmacology research branch early clinical drug evaluation program. Ecdeu assessment manual for psychopharmacology. Rev ed. Rockville Md: U.S. Dept. of health education and welfare public health service alcohol drug abuse and mental health administration national institute of mental health psychopharmacology research branch division of extramural research programs 534–537
Kay SR, Fiszbein A, Opler LA (1987) The positive and negative syndrome scale (PANSS) for schizophrenia. Schizophr Bull 13(2):261–276. https://doi.org/10.1093/schbul/13.2.261
Wallwork RS, Fortgang R, Hashimoto R, Weinberger DR, Dickinson D (2012) Searching for a consensus five-factor model of the positive and negative syndrome scale for schizophrenia. Schizophr Res 137(1-3):246–250. https://doi.org/10.1016/j.schres.2012.01.031
Fervaha G, Foussias G, Agid O, Remington G (2014) Motivational and neurocognitive deficits are central to the prediction of longitudinal functional outcome in schizophrenia. Acta Psychiatr Scand 130(4):290–299. https://doi.org/10.1111/acps.12289
Kaliuzhna M, Kirschner M, Carruzzo F, Hartmann-Riemer MN, Bischof M, Seifritz E, Tobler PN, Kaiser S (2020) Clinical, behavioural and neural validation of the PANSS amotivation factor. Schizophr Res 220:38–45. https://doi.org/10.1016/j.schres.2020.04.018
Liemburg E, Castelein S, Stewart R, van der Gaag M, Aleman A, Knegtering H, Genetic R (2013) Two subdomains of negative symptoms in psychotic disorders: established and confirmed in two large cohorts. J Psychiatr Res 47(6):718–725. https://doi.org/10.1016/j.jpsychires.2013.01.024
Gur RC, Ragland JD, Moberg PJ, Turner TH, Bilker WB, Kohler C, Siegel SJ, Gur RE (2001) Computerized neurocognitive scanning: I. Methodology and validation in healthy people. Neuropsychopharmacology 25(5):766–776. https://doi.org/10.1016/S0893-133X(01)00278-0
Gur RC, Ragland JD, Moberg PJ, Bilker WB, Kohler C, Siegel SJ, Gur RE (2001) Computerized neurocognitive scanning: II. The profile of schizophrenia. Neuropsychopharmacology 25(5):777–788. https://doi.org/10.1016/S0893-133X(01)00279-2
Bhatia T, Agarwal A, Shah G, Wood J, Richard J, Gur RE, Gur RC, Nimgaonkar VL, Mazumdar S, Deshpande SN (2012) Adjunctive cognitive remediation for schizophrenia using yoga: an open, non-randomized trial. Acta Neuropsychiatr 24(2):91–100. https://doi.org/10.1111/j.1601-5215.2011.00587.x
Kassambara A (2019) Ggcorrplot: visualization of a correlation matrix using 'ggplot2'. R package version 0.1.3
Kassambara A (2017) R Graphics essentials for great data visualization: statistical tools for high-throughput data analysis. Available from: https://goo.gl/oT8Ra6
Kassambara A, Mundt F (2020) Factoextra: extract and visualize the results of multivariate data analyses R package version 1.0.7
Kassambara A (2017) Practical guide to cluster analysis in r unsupervised machine learning: statistical tools for high-throughput data analysis. Available from: https://goo.gl/DmJ5y5
Schloerke B, Cook D, Larmarange J, Briatte F, Marbach M, Thoen E, Elberg A, Crowley J (2021) GGally: extension to 'ggplot2'. R package version 2.1.2
Andreasen NC, Olsen S (1982) Negative v positive schizophrenia. Definition and validation. Arch Gen Psychiatry 39(7):789–794. https://doi.org/10.1001/archpsyc.1982.04290070025006
Endicott J, Spitzer RL, Fleiss JL, Cohen J (1976) The global assessment scale. A procedure for measuring overall severity of psychiatric disturbance. Arch Gen Psychiatry 33(6):766–771. https://doi.org/10.1001/archpsyc.1976.01770060086012
Wang J, Lin M, Crenshaw A, Hutchinson A, Hicks B, Yeager M, Berndt S, Huang WY, Hayes RB, Chanock SJ, Jones RC, Ramakrishnan R (2009) High-throughput single nucleotide polymorphism genotyping using nanofluidic dynamic arrays. BMC Genomics 10:561. https://doi.org/10.1186/1471-2164-10-561
Purcell S, Neale B, Todd-Brown K, Thomas L, Ferreira MA, Bender D, Maller J, Sklar P, de Bakker PI, Daly MJ, Sham PC (2007) PLINK: a tool set for whole-genome association and population-based linkage analyses. Am J Hum Genet 81(3):559–575. https://doi.org/10.1086/519795
Gauderman WJ, Morrison JM (2006) QUANTO 1.1: a computer program for power and sample size calculations for genetic-epidemiology studies http://biostats.usc.edu/Quanto.html. Accessed 13 Sept 2019
Wobbrock JO, Findlater L, Gergle D, Higgins JJ (2011) The aligned rank transform for nonparametric factorial analyses using only ANOVA procedures. Proceedings of the ACM Conference on Human Factors in ComputingSystems (CHI ’11); 7–12. Vancouver, BC, Canada; 143–146
Benjamini Y, Krieger AM, Yekutieli D (2006) Adaptive linear step-up procedures that control the false discovery rate. Biometrika 93(3):491–507. https://doi.org/10.1093/biomet/93.3.491
Josse J, Fo H (2016) missMDA: a package for handling missing values in multivariate data analysis. J Statistic Softw 70(1):1–31. https://doi.org/10.18637/jss.v070.i01
Hawkins DM, Weisberg S (2017) Combining the box-cox power and generalised log transformations to accommodate nonpositive responses in linear and mixed-effects linear models. South African Statistic J 51(2):317–328
Fox J, Weisberg S (2011) An R companion to applied regression. SAGE Publications, Los Angeles, Calif London
Lê S, Josse J, Husson F (2008) FactoMineR: an R package for multivariate analysis. J Statisti Softw 25(1):1–18. https://doi.org/10.18637/jss.v025.i01
Kassambara A (2017) Practical guide to principal component methods. In R: statistical tools for high-throughput data analysis. Available from: http://goo.gl/d4Doz9
Cubells JF, van Kammen DP, Kelley ME, Anderson GM, O'Connor DT, Price LH, Malison R, Rao PA, Kobayashi K, Nagatsu T, Gelernter J (1998) Dopamine beta-hydroxylase: two polymorphisms in linkage disequilibrium at the structural gene DBH associate with biochemical phenotypic variation. Hum Genet 102(5):533–540
Goncalves PP, Meireles SM, Neves P, Vale MG (2001) Ca2+ sensitivity of synaptic vesicle dopamine, gamma-aminobutyric acid, and glutamate transport systems. Neurochem Res 26(1):75–81
Lidow MS (2003) Calcium signaling dysfunction in schizophrenia: a unifying approach. Brain Res Brain Res Rev 43(1):70–84
Sczekan SR, Strumwasser F (1996) Antipsychotic drugs block IP3-dependent Ca(2+)-release from rat brain microsomes. Biol Psychiatry 40(6):497–502. https://doi.org/10.1016/0006-3223(95)00657-5
Eckart N, Song Q, Yang R, Wang R, Zhu H, McCallion AS, Avramopoulos D (2016) Functional characterization of schizophrenia-associated variation in CACNA1C. PLoS One 11(6):e0157086. https://doi.org/10.1371/journal.pone.0157086
Zheng F, Zhang Y, Xie W, Li W, Jin C, Mi W, Wang F, Ma W, Ma C, Yang Y, Du B, Li K, Liu C, Wang L, Lu T, Zhang H, Wang Y, Lu L, Lv L et al (2014) Further evidence for genetic association of CACNA1C and schizophrenia: new risk loci in a Han Chinese population and a meta-analysis. Schizophr Res 152(1):105–110. https://doi.org/10.1016/j.schres.2013.12.003
Zhang J, Cai J, Zhang X, Ni J, Guo Z, Zhang Y, Lu W, Zhang C (2013) Does the bipolar disorder-associated CACNA1C gene confer susceptibility to schizophrenia in Han Chinese? J Mol Neurosci 51(2):474–477. https://doi.org/10.1007/s12031-013-0079-4
Song JHT, Lowe CB, Kingsley DM (2018) Characterization of a human-specific tandem repeat associated with bipolar disorder and schizophrenia. Am J Hum Genet 103(3):421–430. https://doi.org/10.1016/j.ajhg.2018.07.011
Harrison PJ, Tunbridge EM, Dolphin AC, Hall J (2019) Voltage-gated calcium channel blockers for psychiatric disorders: genomic reappraisal. Br J Psychiatry:1–4. https://doi.org/10.1192/bjp.2019.157
Hall NAL, Tunbridge EM (2022) Brain-enriched CACNA1C isoforms as novel, selective targets for psychiatric indications. Neuropsychopharmacology 47(1):393–394. https://doi.org/10.1038/s41386-021-01114-2
Bhaduri N, Sarkar K, Sinha S, Chattopadhyay A, Mukhopadhyay K (2010) Study on DBH genetic polymorphisms and plasma activity in attention deficit hyperactivity disorder patients from Eastern India. Cell Mol Neurobiol 30(2):265–274. https://doi.org/10.1007/s10571-009-9448-5
Chamberlain SR, Muller U, Blackwell AD, Robbins TW, Sahakian BJ (2006) Noradrenergic modulation of working memory and emotional memory in humans. Psychopharmacology (Berl) 188(4):397–407. https://doi.org/10.1007/s00213-006-0391-6
Zhang Q, Shen Q, Xu Z, Chen M, Cheng L, Zhai J, Gu H, Bao X, Chen X, Wang K, Deng X, Ji F, Liu C, Li J, Dong Q, Chen C (2012) The effects of CACNA1C gene polymorphism on spatial working memory in both healthy controls and patients with schizophrenia or bipolar disorder. Neuropsychopharmacology 37(3):677–684. https://doi.org/10.1038/npp.2011.242
Essali A, Soares-Weiser K, Bergman H, Adams CE (2018) Calcium channel blockers for antipsychotic-induced tardive dyskinesia. Cochrane Database Syst Rev 3(3):CD000206. https://doi.org/10.1002/14651858.CD000206.pub4
Diehl A, Reinhard I, Schmitt A, Mann K, Gattaz WF (2009) Does the degree of smoking effect the severity of tardive dyskinesia? A longitudinal clinical trial. Eur Psychiatry 24(1):33–40. https://doi.org/10.1016/j.eurpsy.2008.07.007
Acknowledgements
We acknowledge help from Dr. Aravind Kumar of Sandor Life Sciences Pvt. Ltd, Banjara Hills, Hyderabad-500034 for Fluidigm-based genotyping. Skew power transformations using the car package in R was done with help from Prof. Sanford Weisberg, School of Statistics, University of Minnesota. The aligned rank transformation was done with kind help from Prof. James J. Higgins, Department of Statistics, Kansas State University.
Funding
This work was supported by the Department of Biotechnology (DBT), Government of India, New Delhi, India (grant numbers [BT/PR/2425/MED/13/089/2001, B.K.T], [BT/IC-2/Israel/Deshpande/2002, S.N.D], and [BT/IC-2/00/smita/99, S.N.D]) and the Department of Science and Technology – Science and Engineering Research Board, New Delhi, India (grant number SR/S2/JCB-44/2011 – JC Bose phase II, B.K.T).
Author information
Authors and Affiliations
Contributions
The study was designed by B.K. Thelma and Toyanji Joseph Punchaichira. Statistical analysis was done by Toyanji Joseph Punchaichira, Triptish Bhatia, and Prachi Kukshal. Visualization of the data as figures was done by Toyanji Joseph Punchaichira. Samples were recruited by Smita Neelkanth Deshpande and her team at RML Hospital. Preparation of the first draft of the manuscript was done by Toyanji Joseph Punchaichira.
Corresponding author
Ethics declarations
Ethical Approval
This study was performed in line with the principles of the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. Approval was granted by the Ethics Committee of Dr. Ram Manohar Lohia Hospital (No.18-15/2002-RMLH(HAI)/3140 dated 5/3/2004; 18-62/06-RMLH(HA-1)/vol.II/63 dated 30/11/2008 and 18-9/2002-RMLH(HA-I)/1088 dated 15/01/2008)).
Consent to Participate
Informed consent was obtained from all individual participants included in the study.
Consent for Publication
Not applicable.
Competing Interests
The authors declare no competing interests.
Additional information
Publisher’s Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Supplementary Information
ESM 1
Supplementary Figure 1: Scatter Plot Matrix of cognitive accuracy scores among various domains in the study cohort. Scatter plot matrix depicting accuracy of cognitive variables are presented. While Box plots for SZ subjects are depicted as red, that for healthy controls are depicted as blue for each domain in the top panel. Frequency distribution plots for each domain for healthy controls (blue) and SZ subjects (red) are depicted to the left column. Diagonal plots depict overlay of density distribution of SZ subjects (red) and healthy controls (blue) for that domain. Scatter plots and correlation coefficients between each pair of variables for SZ subjects in red and for healthy controls in blue for cognitive domains are also depicted. Supplementary Figure 2: Scatter Plot Matrix of cognitive processing speed scores among various domains in the study cohort. Scatter plot matrix depicting processing speed of cognitive domains are presented. While Box plots for SZ subjects are depicted as red, that for healthy controls are depicted as blue for each domain in the top panel. Frequency distribution plots for each domain for healthy controls (blue) and SZ subjects (red) are depicted to the left column. Diagonal plots depict overlay of density distribution of SZ subjects (red) and healthy controls (blue) for that domain. Scatterplots and correlation coefficients between each pair of variables for SZ subjects in red and for healthy controls in blue for cognitive domains are also depicted. Supplementary Figure 3: Scatter Plot Matrix of cognitive efficiency scores among various domains in the study cohort. Scatter plot matrix depicting efficiency of cognitive domains are presented. While Box plots for SZ subjects are depicted as red, that for healthy controls are depicted as blue for each domain in the top panel. Frequency distribution plots for each domain for healthy controls (blue) and SZ subjects (red) are depicted to the left column. Diagonal plots depict overlay of density distribution of SZ subjects (red) and healthy controls (blue) for that domain. Scatterplots and correlation coefficients between each pair of variables for SZ subjects in red and for healthy controls in blue for cognitive domains are also depicted. Supplementary Figure 4: Scree plot showing the variance explained by number of components for (a)accuracy (b) processing speed and (c) efficiency of cognitive scores. A scree plot with the percentage of variance explained versus the number of dimensions are depicted for (a) accuracy (b) processing speed and (c) efficiency of cognitive domains are depicted. The percentage of variance explained by each dimension is presented on the top of each bar. Supplementary Figure 5: Correlation plot highlighting the quality of representation (cos2) of cognitive variables to various dimensions of (a) accuracy, (b) processing speed and (c) efficiency of cognitive scores. Correlation plot of cos2of eight cognitive domains on to the five dimensions upon PCA is depicted for (a) accuracy (b) processing speed and (c) efficiency. Correlations are depicted from white (the domain not loaded on to that dimension) to grades of blue from light to dark (depicting partial to almost full loading on to that dimension) highlighting most contributing variables to each dimension. Supplementary Figure 6: The total contribution of cognitive variables to PC1 and PC2 of (a) accuracy, (b) processing speed and (c) efficiency of cognitive scores. This plot depicts contribution of each cognitive domain to the first two dimensions on PCA of (a) accuracy, (b) processing speed and (c) efficiency. The red dotted line depicts average contribution if the variables were uniform. Variables more than this threshold could be considered as important in contributing to the first two dimensions. (PDF 3998 kb)
Rights and permissions
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
About this article
Cite this article
Punchaichira, T.J., Kukshal, P., Bhatia, T. et al. Effect of rs1108580 of DBH and rs1006737 of CACNA1C on Cognition and Tardive Dyskinesia in a North Indian Schizophrenia Cohort. Mol Neurobiol 60, 6826–6839 (2023). https://doi.org/10.1007/s12035-023-03496-4
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12035-023-03496-4