Characterisation of three polymorphisms of the tryptophan hydroxylase 2 gene in a sample of Colombian population with major depressive disorder / Caracterización de tres polimorfismos del gen de la triptófano hidroxilasa 2 en una muestra de población colombiana con trastorno depresivo mayor

ABSTRACT

ABSTRACT Objective: Identify whether rs11179000, rs136494 and rs4570625 polymorphisms of the tryptophan hydroxylase 2 gene, are associated with a major depressive disorder in a sample of the Colombian population. Methods: Case-control study was conducted in which a comparison was made between subjects diagnosed with major depressive disorder at some point in adulthood or active symptoms at the time of evaluation, and subjects with no psychiatric disease. Subjects were studied in the Department of Psychiatry, Faculty of Medicine and the Institute of Genetics at the National University of Colombia. Polymorphisms were genotyped using Taqman probes in real time PCR. As well as studying the association between major depressive disorder and these single nucleotide polymorphisms (SNPs), the association with other factors previously associated with depression were also analysed. Results: No statistically significant association between genotypic and allelic frequencies of each polymorphism and major depressive disorder was found. Association between sex and complication during pregnancy/childbirth and major depressive disorder was observed. Association between sex and complication during pregnancy/childbirth and major depres sive disorder was observed. Conclusions: There was no association between any polymorphism and major depressive disorder.

RESUMEN

RESUMEN Objetivo: Identificar si los polimorfismos rs11179000, rs136494 y rs4570625 del gen de la triptófano hidroxilasa 2 están asociados a trastorno depresivo mayor en una muestra de población colombiana. Métodos: Estudio de casos y controles en el que se comparó a sujetos con trastorno depresivo mayor diagnosticado en algún momento de la vida adulta o con síntomas activos en el momento de la valoración y sujetos sin enfermedad psiquiátrica. Se estudió a los sujetos en el Departamento de Psiquiatría de la Facultad de Medicina y en el Instituto de Genética de la Universidad Nacional de Colombia. Se genotipificaron los polimorfismos usando reacción en cadena de la polimerasa en tiempo real y sondas Taqman. Además de buscar asociación entre trastorno depresivo mayor y estos polimorfismos de un solo nucleótido, se exploró asociación con otros factores relacionados previamente con depresión. Resultados: No se encontró asociación estadísticamente significativa entre las frecuencias genotípicas o alélicas de cada polimorfismo y el trastorno depresivo mayor. Se observó asociación entre sexo y complicaciones durante el embarazo/parto y trastorno depresivo mayor. Conclusiones: No se halló asociación entre polimorfismo alguno y el trastorno depresivo mayor.