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Genetic studies of neuropsychiatric disorders in Costa Rica: a model for the use of isolated populations

Mathews, Carol A.a; Reus, Victor I.b; Bejarano, Julioc; Escamilla, Michael A.d; Fournier, Eduardoc; Herrera, Luis Diegoe; Lowe, Thomas L.b f; McInnes, L. Alisong; Molina, Julioh; Ophoff, Roel A.i; Raventos, Henriettaj; Sandkuijl, Lodewijk A.k †; Service, Susan K.i; Spesny, Mitzic; León, Pedro E.c j; Freimer, Nelson B.i

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The importance of genetics in understanding the etiology of mental illness has become increasingly clear in recent years, as more evidence has mounted that almost all neuropsychiatric disorders have a genetic component. It has also become clear, however, that these disorders are etiologically complex, and multiple genetic and environmental factors contribute to their makeup. So far, traditional linkage mapping studies have not definitively identified specific disease genes for neuropsychiatric disorders, although some potential candidates have been identified via these methods (e.g. the dysbindin gene in schizophrenia; Straub et al., 2002; Schwab et al., 2003). For this reason, alternative approaches are being attempted, including studies in genetically isolated populations. Because isolated populations have a high degree of genetic homogeneity, their use may simplify the process of identifying disease genes in disorders where multiple genes may play a role. Several areas of Latin America contain genetically isolated populations that are well suited for the study of neuropsychiatric disorders. Genetic studies of several major psychiatric illnesses, including bipolar disorder, major depression, schizophrenia, Tourette Syndrome, alcohol dependence, attention deficit hyperactivity disorder, and obsessive–compulsive disorder, are currently underway in these regions. In this paper we highlight the studies currently being conducted by our groups in the Central Valley of Costa Rica to illustrate the potential advantages of this population for genetic studies.

aDepartment of Psychiatry, University of California, San Diego, CA, USA

bDepartment of Psychiatry, University of California, San Francisco, CA, USA

cCentro de Biología Molecular y Celular de la Universidad de Costa Rica, San José, Costa Rica

dNeurogenetics Laboratory, Department of Psychiatry, The University of Texas Health Science Center, San Antonio, Texas, USA

eHospital CIMA, San José, Costa Rica

fDepartment of Child and Adolescent Psychiatry, University of California, San Francisco, CA, USA

gLaboratory of Neurobehavioral Genetics, Mt Sinai School of Medicine, New York, New York, USA

hCentro Internacional de Control de Estres, Guatemala

iCenter for Neurobehavioral Genetics, Departments of Psychiatry and Human Genetics, University of California, Los Angeles, CA, USA

jEscuela de Medicina, Universidad de Costa Rica, San José, Costa Rica

kDepartment of Medical Statistics, Leiden University Medical Center, Leiden, The Netherlands

Sponsorship: This work was partially supported by a grant from the NIH (RR15533).

Correspondence and requests for reprints to Carol A. Mathews, Department of Psychiatry, University of California, San Diego, 9500 Gilman Drive, 0810, La Jolla, CA 92093-0810, USA

Tel: +1 619 725 3522; fax: +1 619 260 8437;

e-mail: camathews@ucsd.edu

Received 1 June 2002 Accepted 1 March 2003

This manuscript is dedicated to the memory of Lodewijk Sandkuijl MD., 31st July 1953 – 4th December 2002.

© 2004 Lippincott Williams & Wilkins, Inc.