We use cookies to improve your experience. By continuing to browse this site, you accept our cookie policy.×
Skip main navigation
Aging Health
Bioelectronics in Medicine
Biomarkers in Medicine
Breast Cancer Management
CNS Oncology
Colorectal Cancer
Concussion
Epigenomics
Future Cardiology
Future Medicine AI
Future Microbiology
Future Neurology
Future Oncology
Future Rare Diseases
Future Virology
Hepatic Oncology
HIV Therapy
Immunotherapy
International Journal of Endocrine Oncology
International Journal of Hematologic Oncology
Journal of 3D Printing in Medicine
Lung Cancer Management
Melanoma Management
Nanomedicine
Neurodegenerative Disease Management
Pain Management
Pediatric Health
Personalized Medicine
Pharmacogenomics
Regenerative Medicine

Genetic correlates of olanzapine-induced weight gain in schizophrenia subjects from north India: role of metabolic pathway genes

    Vibhuti Srivastava

    Department of Genetics, University of Delhi South Campus, Benito Juarez Road, New Delhi 110 021, India.

    ,
    Smita N Deshpande

    Department of Psychiatry, Dr RML Hospital, New Delhi 110 001, India

    ,
    Vishwajit L Nimgaonkar

    Department of Psychaitry, School of Medicine and Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, PA 15213, USA

    ,
    Bernard Lerer

    Department of Psychaitry, Hadassah-Hebrew University Medical Center, Ein Karem, Jerusalem, Israel

    &
    BK Thelma

    † Author for correspondence

    Department of Genetics, University of Delhi South Campus, Benito Juarez Road, New Delhi 110 021, India.

    Aim: Olanzapine is an efficacious drug often used as a first-line medication in the treatment for schizophrenia. However, weight gain is a notable adverse drug reaction of this medication in a proportion of patients and a major cause of noncompliance. Several hypotheses, including a contribution from hormonal, physiological and environmental factors, have been postulated. In this study, we aimed to analyze a possible association of genetic polymorphisms at four important candidate genes involved in appetite regulation and antipsychotic-induced metabolic syndrome with olanzapine-induced weight gain. Materials & methods: A total of 154 schizophrenia subjects were recruited in a systematic, 6-week, open-label trial of olanzapine. We investigated the contribution of 14 polymorphisms from four genes, namely, leptin, lipoprotein lipase, tri-acyl-glycerol lipase and citrate lyase using a binary logistic regression analysis towards olanzapine-induced weight gain. Results: rs 4731426 C/G SNP, a variant in the leptin gene, was moderately associated with median weight gain (Δ weightm; [p = 0.05; OR: 2.2; 95% CI: 0.99–4.90]) and significantly associated with extreme weight gain (Δ weighte [p = 0.019; OR: 11.43; 95% CI: 1.49–87.55]) when average drug dose was included in a regression model. Using in silico analysis, we found that this associated intronic SNP in the leptin gene alters the binding of zinc finger 5, a transcription factor. Conclusion: The leptin gene may be a promising candidate for olanzapine-induced weight gain. As the associations are modest, replicate studies are warranted. This approach may facilitate rationalized drug regimens.

    Bibliography

    • Baldwin DS, Montgomery SA: First clinical experience with olanzapine (LY 170053): results of an open-label safety and dose-ranging study in patients with schizophrenia. Int. Clin. Psychopharmacol.10,239–244 (1995).
    • Lieberman JA, Stroup TS, McEvoy JP et al.: Effectiveness of antipsychotic drugs in patients with chronic schizophrenia. N. Engl. J. Med.353,1209–1223 (2005).
    • Morozova MA, Zharkova NB, Beniashvili AG: [The experience of application of olanzapine: an atypical neuroleptic in acute schizophrenia]. Zh. Nevrol. Psikhiatr. Im. S. S. Korsakova100,37–43 (2000).
    • Fellows L, Ahmad F, Castle DJ, Dusci LJ, Bulsara MK, Ilett KF: Investigation of target plasma concentration – effect relationships for olanzapine in schizophrenia. Ther. Drug Monit.25,682–689 (2003).
    • Leucht S, Pitschel-Walz G, Abraham D, Kissling W: Efficacy and extrapyramidal side-effects of the new antipsychotics olanzapine, quetiapine, risperidone, and sertindole compared to conventional antipsychotics and placebo. A meta-analysis of randomized controlled trials. Schizophr. Res.35,51–68 (1999).
    • Yasuhara D, Nakahara T, Harada T, Inui A: Olanzapine-induced hyperglycemia in anorexia nervosa. Am. J. Psychiatry164,528–529 (2007).
    • Melkersson KI, Dahl ML: Relationship between levels of insulin or triglycerides and serum concentrations of the atypical antipsychotics clozapine and olanzapine in patients on treatment with therapeutic doses. Psychopharmacology170,157–166 (2003).
    • Allison DB, Mentore JL, Heo M et al.: Antipsychotic-induced weight gain: a comprehensive research synthesis. Am. J. Psychiatry156,1686–1696 (1999).
    • Osser DN, Najarian DM, Dufresne RL: Olanzapine increases weight and serum triglyceride levels. J. Clin. Psychiatry60,767–770 (1999).
    • 10  Henderson DC, Cagliero E, Gray C et al.: Clozapine, diabetes mellitus, weight gain, and lipid abnormalities: a five-year naturalistic study. Am. J. Psychiatry157,975–981 (2000).
    • 11  Koro CE, Fedder DO, l´Italien GJ et al.: Assessment of independent effect of olanzapine and risperidone on risk of diabetes among patients with schizophrenia: population based nested case–control study. BMJ325,243 (2002).
    • 12  Sernyak MJ, Leslie DL, Alarcon RD, Losonczy MF, Rosenheck R: Association of diabetes mellitus with use of atypical neuroleptics in the treatment of schizophrenia. Am. J. Psychiatry159,561–566 (2002).
    • 13  Kinon BJ, Basson BR, Gilmore, JA, Tollefson GD: Long-term olanzapine treatment: weight change and weight-related health factors in schizophrenia. J. Clin. Psychiatry62,92–100 (2001).
    • 14  Murashita M, Kusumi I, Inoue T et al.: Olanzapine increases plasma ghrelin level in patients with schizophrenia. Psychoneuroendocrinology30,106–110 (2005).
    • 15  Gothelf D, Falk B, Singer Pet al.: Weight gain associated with increased food intake and low habitual activity levels in male adolescent schizophrenic inpatients treated with olanzapine. Am. J. Psychiatry159,1055–1057 (2002).
    • 16  Richelson E: Preclinical pharmacology of neuroleptics: focus on new generation compounds. J. Clin. Psychiatry57(Suppl. 11),4–11 (1996).
    • 17  Wirshing DA, Wirshing WC, Kysar L et al.: Novel antipsychotics: comparison of weight gain liabilities. J. Clin. Psychiatry60,358–363 (1999).
    • 18  Baptista T, Zarate J, Joober R et al.: Drug induced weight gain, an impediment to successful pharmacotherapy: focus on antipsychotics. Curr. Drug Targets5,279–299 (2004).
    • 19  Ruetsch O, Viala A, Bardou H, Martin P, Vacheron MN: [Psychotropic drugs induced weight gain: a review of the literature concerning epidemiological data, mechanisms and management]. Encephale31,507–516 (2005).
    • 20  Graham KA, Perkins DO, Edwards LJ, Barrier RC Jr, Lieberman JA, Harp JB: Effect of olanzapine on body composition and energy expenditure in adults with first-episode psychosis. Am. J. Psychiatry162,118–123 (2005).
    • 21  Haupt DW, Luber A, Maeda J, Melson AK, Schweiger JA, Newcomer JW: Plasma leptin and adiposity during antipsychotic treatment of schizophrenia. Neuropsychopharmacology30,184–191 (2005).
    • 22  Blum WF: Leptin: the voice of the adipose tissue. Horm. Res.48(Suppl. 4),2–8 (1997).
    • 23  Eder U, Mangweth B, Ebenbichler C et al.: Association of olanzapine-induced weight gain with an increase in body fat. Am. J. Psychiatry158(10),1719–1722 (2001).
    • 24  Templeman LA, Reynolds GP, Arranz B, San L: Polymorphisms of the 5-HT2C receptor and leptin genes are associated with antipsychotic drug-induced weight gain in Caucasian subjects with a first-episode psychosis. Pharmacogenet. Genomics15(4),195–200 (2005).
    • 25  Ellingrod VL, Perry PJ, Ringold JC et al.: Weight gain associated with the -759C/T polymorphism of the 5HT2C receptor and olanzapine. Am. J. Med. Genet. B Neuropsychiatr. Genet.134(1),76–78 (2005).
    • 26  Reynolds GP, Hill MJ, Kirk SL: The 5-HT2C receptor and antipsychotic induced weight gain – mechanisms and genetics. J. Psychopharmacol.20(Suppl. 4),15–18 (2006).
    • 27  Bozina N, Medved V, Kuzman MR, Sain I, Sertic J: Association study of olanzapine-induced weight gain and therapeutic response with SERT gene polymorphisms in female schizophrenic patients. J. Psychopharmacol.21(7),728–734 (2007).
    • 28  Park YM, Chung YC, Lee SH et al.: Weight gain associated with the α2a-adrenergic receptor -1,291 C/G polymorphism and olanzapine treatment. Am. J. Med. Genet. B Neuropsychiatr. Genet.141(4),394–397 (2006).
    • 29  Bishop JR, Ellingrod VL, Moline J, Miller D: Pilot study of the G-protein β3 subunit gene (C825T) polymorphism and clinical response to olanzapine or olanzapine-related weight gain in persons with schizophrenia. Med. Sci. Monit.12,BR47–BR50 (2006).
    • 30  Müller DJ, Klempan TA, de Luca V et al.: The SNAP-25 gene may be associated with clinical response and weight gain in antipsychotic treatment of schizophrenia. Neurosci. Lett.379(2),81–89 (2005).
    • 31  Ellingrod VL, Bishop JR, Moline J, Lin YC, Miller del D: Leptin and leptin receptor gene polymorphisms and increases in body mass index (BMI) from olanzapine treatment in persons with schizophrenia. Psychopharmacol. Bull.40,57–62 (2007).
    • 32  Kang SG, Lee HJ, Park YM et al.: Possible association between the -2548A/G polymorphism of the leptin gene and olanzapine-induced weight gain. Prog. Neuropsychopharmacol. Biol. Psychiatry32(1),160–163 (2008).
    • 33  Thomas P, Srivastava V, Singh A et al.: Correlates of response to olanzapine among Indians with schizophrenia. Psychiatric Res. (2008) (In press).
    • 34  Nurnberger JI Jr, Blehar MC, Kaufmann CA et al.: Diagnostic interview for genetic studies. Rationale, unique features, and training. NIMH Genetics Initiative. Arch. Gen. Psychiatry5(11),849–59; discussion 863–864 (1994).
    • 35  Deshpande SN, Mathur MN, Das SK, Bhatia T, Sharma S, Nimgaonkar VL: A Hindi version of the Diagnostic Interview for Genetic Studies. Schizophr. Bull.24,489–493 (1998).
    • 36  Kay SR, Fiszbein A, Opler LA: The Positive And Negative Syndrome Scale (PANSS) for schizophrenia. Schizophr. Bull.13,261–276 (1987).
    • 37  Guy W: ECDEU Assessment Manual for Psychopharmacology (Revised Edition). Department of Health, Education and Welfare, Washington DC, USA (1976).
    • 38  Simpson GH, Angus GSW: A rating scale for extrapyramidal side effects. Acta Psychiatr. Scand. (Suppl. 212),11–19 (1970).
    • 39  Avasthi A, Kulhara P, Kakkar N: Olanzapine in the treatment of Schizophrenia: an open label comparative clinical trial from north India. Indian J. Psychiatry43(3) 257–263 (2001).
    • 40  Guha P, Roy K, Sanyal D, Dasgupta T, Bhattacharya K: Olanzapine-induced obesity and diabetes in Indian patients: a prospective trial comparing olanzapine with typical antipsychotics. J. Indian Med. Assoc.103,660–664 (2005).
    • 41  Dossenbach M, Erol A, Kessaci M et al.: Effectiveness of antipsychotic treatments for schizophrenia: interim 6-month analysis from a prospective observational study (IC-SOHO) comparing olanzapine, quetiapine, risperidone and haloperidol. J. Clin. Psychiatry65(3),312–321 (2004).
    • 42  Ruano G, Goethe JW, Caley C et al.: Physiogenomic comparison of weight profiles of olanzapine- and risperidone-treated patients. Mol. Psychiatry12(5),474–482 (2007).
    • 43  Dahlman I, Arner P: Obesity and polymorphisms in genes regulating human adipose tissue. Int. J. Obes. (Lond.)31(11),1629–1641 (2007).
    • 44  Oswal A, Yeo GS: The leptin melanocortin pathway and the control of body weight: lessons from human and murine genetics. Obes. Rev.8,293–306 (2007).
    • 45  Lindroos AK, Lissner L, Carlsson B et al.: Familial predisposition for obesity may modify the predictive value of serum leptin concentrations for long-term weight change in obese women. Am. J. Clin. Nutr.67,1119–1123 (1998).
    • 46  Kraus T, Haack M, Schuld A et al.: Body weight and leptin plasma levels during treatment with antipsychotic drugs. Am. J. Psychiatry156,312–314 (1999).
    • 47  Campfield LA, Smith FJ, Guisez Y, Devos R, Burn P: Recombinant mouse OB protein: evidence for a peripheral signal linking adiposity and central neural networks. Science269,546–549 (1995).
    • 48  Schug J, Unit 2.6: Using TESS to Predict Transcription Factor Binding Sites in DNA Sequence, Current Protocols in Bioinformatics. John Wiley and Sons, NJ, USA (2003)
    • 49  Cleynen I, Brants JR, Peeters K et al.: HMGA2 regulates transcription of the Imp2gene via an intronic regulatory element in cooperation with nuclear factor-κB. Mol. Cancer Res.5,363–372 (2007).
    • 50  Gorshkova EV, Kaledin VI, Kobzev VF, Merkulova TI: Lung cancer-associated SNP at the beginning of mouse K-ras gene intron 2 is essential for transcription factor binding. Bull. Exp. Biol. Med.141,731–733 (2006).
    • 51  Yanagi M, Hashimoto T, Kitamura N et al.: Expression of Kruppel-like factor 5 gene in human brain and association of the gene with the susceptibility to schizophrenia. Schizophr. Res.100(1–3),291–301 (2008).
    • 52  Chamberlain JC, Thorn JA, Oka K, Galton DJ, Stocks J: DNA polymorphisms at the lipoprotein lipase gene: associations in normal and hypertriglyceridaemic subjects. Atherosclerosis79,85–91 (1989).
    • 53  Heizmann C, Kirchgessner T, Kwiterovich PO et al.: DNA polymorphism haplotypes of the human lipoprotein lipase gene: possible association with high density lipoprotein levels. Hum. Genet.86,578–584 (1991).
    • 54  Shimo-Nakanishi Y, Urabe T, Hattori N et al.: Polymorphism of the lipoprotein lipase gene and risk of atherothrombotic cerebral infarction in the Japanese. Stroke32,1481–1486 (2001).
    • 55  Thorn JA, Chamberlain JC, Alcolado JC et al.: Lipoprotein and hepatic lipase gene variants in coronary atherosclerosis. Atherosclerosis85,55–60 (1990).
    • 56  Li S, Chen W, Srinivasan SR, Boerwinkle E, Berenson GS: Influence of lipoprotein lipase gene Ser447Stop and β1-adrenergic receptor gene Arg389Gly polymorphisms and their interaction on obesity from childhood to adulthood: the Bogalusa Heart Study. Int. J. Obes. (Lond.)30,1183–1188 (2006).
    • 57  Mattu RK, Needham EW, Morgan R et al.: DNA variants at the LPL gene locus associate with angiographically defined severity of atherosclerosis and serum lipoprotein levels in a Welsh population. Arterioscler. Thromb.14,1090–1097 (1994).
    • 58  Gerdes C, Gerdes LU, Hansen PS, Faergeman O: Polymorphisms in the lipoprotein lipase gene and their associations with plasma lipid concentrations in 40-year-old Danish men. Circulation92,1765–1769 (1995).
    • 59  Wang XL, McCredie RM, Wilcken DE: Common DNA polymorphisms at the lipoprotein lipase gene. Association with severity of coronary artery disease and diabetes. Circulation93,1339–1345 (1996).
    • 60  Groenemeijer BE, Hallman MD, Reymer PW et al.: Genetic variant showing a positive interaction with β-blocking agents with a beneficial influence on lipoprotein lipase activity, HDL cholesterol, and triglyceride levels in coronary artery disease patients. The Ser447-Stop substitution in the lipoprotein lipase gene. REGRESS Study Group. Circulation95,2628–2635 (1997).
    • 101  International HapMap project www.hapmap.org
    • 102  Web resources of genetic linkage analysis www.linkage.rockefeller.edu

    Bibliography

    • Baldwin DS, Montgomery SA: First clinical experience with olanzapine (LY 170053): results of an open-label safety and dose-ranging study in patients with schizophrenia. Int. Clin. Psychopharmacol.10,239–244 (1995).
    • Lieberman JA, Stroup TS, McEvoy JP et al.: Effectiveness of antipsychotic drugs in patients with chronic schizophrenia. N. Engl. J. Med.353,1209–1223 (2005).
    • Morozova MA, Zharkova NB, Beniashvili AG: [The experience of application of olanzapine: an atypical neuroleptic in acute schizophrenia]. Zh. Nevrol. Psikhiatr. Im. S. S. Korsakova100,37–43 (2000).
    • Fellows L, Ahmad F, Castle DJ, Dusci LJ, Bulsara MK, Ilett KF: Investigation of target plasma concentration – effect relationships for olanzapine in schizophrenia. Ther. Drug Monit.25,682–689 (2003).
    • Leucht S, Pitschel-Walz G, Abraham D, Kissling W: Efficacy and extrapyramidal side-effects of the new antipsychotics olanzapine, quetiapine, risperidone, and sertindole compared to conventional antipsychotics and placebo. A meta-analysis of randomized controlled trials. Schizophr. Res.35,51–68 (1999).
    • Yasuhara D, Nakahara T, Harada T, Inui A: Olanzapine-induced hyperglycemia in anorexia nervosa. Am. J. Psychiatry164,528–529 (2007).
    • Melkersson KI, Dahl ML: Relationship between levels of insulin or triglycerides and serum concentrations of the atypical antipsychotics clozapine and olanzapine in patients on treatment with therapeutic doses. Psychopharmacology170,157–166 (2003).
    • Allison DB, Mentore JL, Heo M et al.: Antipsychotic-induced weight gain: a comprehensive research synthesis. Am. J. Psychiatry156,1686–1696 (1999).
    • Osser DN, Najarian DM, Dufresne RL: Olanzapine increases weight and serum triglyceride levels. J. Clin. Psychiatry60,767–770 (1999).
    • 10  Henderson DC, Cagliero E, Gray C et al.: Clozapine, diabetes mellitus, weight gain, and lipid abnormalities: a five-year naturalistic study. Am. J. Psychiatry157,975–981 (2000).
    • 11  Koro CE, Fedder DO, l´Italien GJ et al.: Assessment of independent effect of olanzapine and risperidone on risk of diabetes among patients with schizophrenia: population based nested case–control study. BMJ325,243 (2002).
    • 12  Sernyak MJ, Leslie DL, Alarcon RD, Losonczy MF, Rosenheck R: Association of diabetes mellitus with use of atypical neuroleptics in the treatment of schizophrenia. Am. J. Psychiatry159,561–566 (2002).
    • 13  Kinon BJ, Basson BR, Gilmore, JA, Tollefson GD: Long-term olanzapine treatment: weight change and weight-related health factors in schizophrenia. J. Clin. Psychiatry62,92–100 (2001).
    • 14  Murashita M, Kusumi I, Inoue T et al.: Olanzapine increases plasma ghrelin level in patients with schizophrenia. Psychoneuroendocrinology30,106–110 (2005).
    • 15  Gothelf D, Falk B, Singer Pet al.: Weight gain associated with increased food intake and low habitual activity levels in male adolescent schizophrenic inpatients treated with olanzapine. Am. J. Psychiatry159,1055–1057 (2002).
    • 16  Richelson E: Preclinical pharmacology of neuroleptics: focus on new generation compounds. J. Clin. Psychiatry57(Suppl. 11),4–11 (1996).
    • 17  Wirshing DA, Wirshing WC, Kysar L et al.: Novel antipsychotics: comparison of weight gain liabilities. J. Clin. Psychiatry60,358–363 (1999).
    • 18  Baptista T, Zarate J, Joober R et al.: Drug induced weight gain, an impediment to successful pharmacotherapy: focus on antipsychotics. Curr. Drug Targets5,279–299 (2004).
    • 19  Ruetsch O, Viala A, Bardou H, Martin P, Vacheron MN: [Psychotropic drugs induced weight gain: a review of the literature concerning epidemiological data, mechanisms and management]. Encephale31,507–516 (2005).
    • 20  Graham KA, Perkins DO, Edwards LJ, Barrier RC Jr, Lieberman JA, Harp JB: Effect of olanzapine on body composition and energy expenditure in adults with first-episode psychosis. Am. J. Psychiatry162,118–123 (2005).
    • 21  Haupt DW, Luber A, Maeda J, Melson AK, Schweiger JA, Newcomer JW: Plasma leptin and adiposity during antipsychotic treatment of schizophrenia. Neuropsychopharmacology30,184–191 (2005).
    • 22  Blum WF: Leptin: the voice of the adipose tissue. Horm. Res.48(Suppl. 4),2–8 (1997).
    • 23  Eder U, Mangweth B, Ebenbichler C et al.: Association of olanzapine-induced weight gain with an increase in body fat. Am. J. Psychiatry158(10),1719–1722 (2001).
    • 24  Templeman LA, Reynolds GP, Arranz B, San L: Polymorphisms of the 5-HT2C receptor and leptin genes are associated with antipsychotic drug-induced weight gain in Caucasian subjects with a first-episode psychosis. Pharmacogenet. Genomics15(4),195–200 (2005).
    • 25  Ellingrod VL, Perry PJ, Ringold JC et al.: Weight gain associated with the -759C/T polymorphism of the 5HT2C receptor and olanzapine. Am. J. Med. Genet. B Neuropsychiatr. Genet.134(1),76–78 (2005).
    • 26  Reynolds GP, Hill MJ, Kirk SL: The 5-HT2C receptor and antipsychotic induced weight gain – mechanisms and genetics. J. Psychopharmacol.20(Suppl. 4),15–18 (2006).
    • 27  Bozina N, Medved V, Kuzman MR, Sain I, Sertic J: Association study of olanzapine-induced weight gain and therapeutic response with SERT gene polymorphisms in female schizophrenic patients. J. Psychopharmacol.21(7),728–734 (2007).
    • 28  Park YM, Chung YC, Lee SH et al.: Weight gain associated with the α2a-adrenergic receptor -1,291 C/G polymorphism and olanzapine treatment. Am. J. Med. Genet. B Neuropsychiatr. Genet.141(4),394–397 (2006).
    • 29  Bishop JR, Ellingrod VL, Moline J, Miller D: Pilot study of the G-protein β3 subunit gene (C825T) polymorphism and clinical response to olanzapine or olanzapine-related weight gain in persons with schizophrenia. Med. Sci. Monit.12,BR47–BR50 (2006).
    • 30  Müller DJ, Klempan TA, de Luca V et al.: The SNAP-25 gene may be associated with clinical response and weight gain in antipsychotic treatment of schizophrenia. Neurosci. Lett.379(2),81–89 (2005).
    • 31  Ellingrod VL, Bishop JR, Moline J, Lin YC, Miller del D: Leptin and leptin receptor gene polymorphisms and increases in body mass index (BMI) from olanzapine treatment in persons with schizophrenia. Psychopharmacol. Bull.40,57–62 (2007).
    • 32  Kang SG, Lee HJ, Park YM et al.: Possible association between the -2548A/G polymorphism of the leptin gene and olanzapine-induced weight gain. Prog. Neuropsychopharmacol. Biol. Psychiatry32(1),160–163 (2008).
    • 33  Thomas P, Srivastava V, Singh A et al.: Correlates of response to olanzapine among Indians with schizophrenia. Psychiatric Res. (2008) (In press).
    • 34  Nurnberger JI Jr, Blehar MC, Kaufmann CA et al.: Diagnostic interview for genetic studies. Rationale, unique features, and training. NIMH Genetics Initiative. Arch. Gen. Psychiatry5(11),849–59; discussion 863–864 (1994).
    • 35  Deshpande SN, Mathur MN, Das SK, Bhatia T, Sharma S, Nimgaonkar VL: A Hindi version of the Diagnostic Interview for Genetic Studies. Schizophr. Bull.24,489–493 (1998).
    • 36  Kay SR, Fiszbein A, Opler LA: The Positive And Negative Syndrome Scale (PANSS) for schizophrenia. Schizophr. Bull.13,261–276 (1987).
    • 37  Guy W: ECDEU Assessment Manual for Psychopharmacology (Revised Edition). Department of Health, Education and Welfare, Washington DC, USA (1976).
    • 38  Simpson GH, Angus GSW: A rating scale for extrapyramidal side effects. Acta Psychiatr. Scand. (Suppl. 212),11–19 (1970).
    • 39  Avasthi A, Kulhara P, Kakkar N: Olanzapine in the treatment of Schizophrenia: an open label comparative clinical trial from north India. Indian J. Psychiatry43(3) 257–263 (2001).
    • 40  Guha P, Roy K, Sanyal D, Dasgupta T, Bhattacharya K: Olanzapine-induced obesity and diabetes in Indian patients: a prospective trial comparing olanzapine with typical antipsychotics. J. Indian Med. Assoc.103,660–664 (2005).
    • 41  Dossenbach M, Erol A, Kessaci M et al.: Effectiveness of antipsychotic treatments for schizophrenia: interim 6-month analysis from a prospective observational study (IC-SOHO) comparing olanzapine, quetiapine, risperidone and haloperidol. J. Clin. Psychiatry65(3),312–321 (2004).
    • 42  Ruano G, Goethe JW, Caley C et al.: Physiogenomic comparison of weight profiles of olanzapine- and risperidone-treated patients. Mol. Psychiatry12(5),474–482 (2007).
    • 43  Dahlman I, Arner P: Obesity and polymorphisms in genes regulating human adipose tissue. Int. J. Obes. (Lond.)31(11),1629–1641 (2007).
    • 44  Oswal A, Yeo GS: The leptin melanocortin pathway and the control of body weight: lessons from human and murine genetics. Obes. Rev.8,293–306 (2007).
    • 45  Lindroos AK, Lissner L, Carlsson B et al.: Familial predisposition for obesity may modify the predictive value of serum leptin concentrations for long-term weight change in obese women. Am. J. Clin. Nutr.67,1119–1123 (1998).
    • 46  Kraus T, Haack M, Schuld A et al.: Body weight and leptin plasma levels during treatment with antipsychotic drugs. Am. J. Psychiatry156,312–314 (1999).
    • 47  Campfield LA, Smith FJ, Guisez Y, Devos R, Burn P: Recombinant mouse OB protein: evidence for a peripheral signal linking adiposity and central neural networks. Science269,546–549 (1995).
    • 48  Schug J, Unit 2.6: Using TESS to Predict Transcription Factor Binding Sites in DNA Sequence, Current Protocols in Bioinformatics. John Wiley and Sons, NJ, USA (2003)
    • 49  Cleynen I, Brants JR, Peeters K et al.: HMGA2 regulates transcription of the Imp2gene via an intronic regulatory element in cooperation with nuclear factor-κB. Mol. Cancer Res.5,363–372 (2007).
    • 50  Gorshkova EV, Kaledin VI, Kobzev VF, Merkulova TI: Lung cancer-associated SNP at the beginning of mouse K-ras gene intron 2 is essential for transcription factor binding. Bull. Exp. Biol. Med.141,731–733 (2006).
    • 51  Yanagi M, Hashimoto T, Kitamura N et al.: Expression of Kruppel-like factor 5 gene in human brain and association of the gene with the susceptibility to schizophrenia. Schizophr. Res.100(1–3),291–301 (2008).
    • 52  Chamberlain JC, Thorn JA, Oka K, Galton DJ, Stocks J: DNA polymorphisms at the lipoprotein lipase gene: associations in normal and hypertriglyceridaemic subjects. Atherosclerosis79,85–91 (1989).
    • 53  Heizmann C, Kirchgessner T, Kwiterovich PO et al.: DNA polymorphism haplotypes of the human lipoprotein lipase gene: possible association with high density lipoprotein levels. Hum. Genet.86,578–584 (1991).
    • 54  Shimo-Nakanishi Y, Urabe T, Hattori N et al.: Polymorphism of the lipoprotein lipase gene and risk of atherothrombotic cerebral infarction in the Japanese. Stroke32,1481–1486 (2001).
    • 55  Thorn JA, Chamberlain JC, Alcolado JC et al.: Lipoprotein and hepatic lipase gene variants in coronary atherosclerosis. Atherosclerosis85,55–60 (1990).
    • 56  Li S, Chen W, Srinivasan SR, Boerwinkle E, Berenson GS: Influence of lipoprotein lipase gene Ser447Stop and β1-adrenergic receptor gene Arg389Gly polymorphisms and their interaction on obesity from childhood to adulthood: the Bogalusa Heart Study. Int. J. Obes. (Lond.)30,1183–1188 (2006).
    • 57  Mattu RK, Needham EW, Morgan R et al.: DNA variants at the LPL gene locus associate with angiographically defined severity of atherosclerosis and serum lipoprotein levels in a Welsh population. Arterioscler. Thromb.14,1090–1097 (1994).
    • 58  Gerdes C, Gerdes LU, Hansen PS, Faergeman O: Polymorphisms in the lipoprotein lipase gene and their associations with plasma lipid concentrations in 40-year-old Danish men. Circulation92,1765–1769 (1995).
    • 59  Wang XL, McCredie RM, Wilcken DE: Common DNA polymorphisms at the lipoprotein lipase gene. Association with severity of coronary artery disease and diabetes. Circulation93,1339–1345 (1996).
    • 60  Groenemeijer BE, Hallman MD, Reymer PW et al.: Genetic variant showing a positive interaction with β-blocking agents with a beneficial influence on lipoprotein lipase activity, HDL cholesterol, and triglyceride levels in coronary artery disease patients. The Ser447-Stop substitution in the lipoprotein lipase gene. REGRESS Study Group. Circulation95,2628–2635 (1997).
    • 101  International HapMap project www.hapmap.org
    • 102  Web resources of genetic linkage analysis www.linkage.rockefeller.edu