title: Genetically engineered mice for studies of stress-related clinical conditions.
abstract: Genetically engineered mice with a specific deletion of targeted genes provide a novel and useful tool to study the endogenous mechanisms underlying aberrant behaviour. In this review we take the stress hormone (hypothalamic-pituitary-adrenocortical) system as an example to demonstrate how refined molecular technologies have allowed to target individual genes involved in stress hormone regulation. We describe different gene targeting methods: the generation of "conventional" knock-out mice enables us to delete a gene of interest in every cell of the body. Equally important for the studies of gene function in the mouse is the use of tissue-specific regulatory systems that allow gene inactivation to be restricted to specific tissues and, in some cases, to specific time points during development, such as the "conditional" knock-out, or the application of antisense techniques. Importantly, deletion of individual genes is not providing animal models for certain psychiatric disorders as these are caused by a manifold of minor changes in a series of so-called susceptibility genes. However, these gene targeting methods have become valuable tools to dissect the functions of individual components of complex biological systems in behavioural neuroscience: genetically engineered animals help to unravel the complex interactions and correlations between individual genes, hormonal regulation and behaviour, the most complex form of biological organization.
authors.affiliation: Max Planck Institute of Psychiatry, Kraepelinstrasse 2-10, 80804 Munich, Germany. muellerm@mpipsykl.mpg.de
authors.forename: Marianne B
authors.initials: MB
authors.lastname: Müller
authors.forename: Martin E
authors.initials: ME
authors.lastname: Keck
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000378:metabolism; D000818:Animals; D002540:Cerebral Cortex / Q000378:metabolism; D003346:Corticotropin-Releasing Hormone / Q000378:metabolism; D005818:Genetic Engineering; D006854:Hydrocortisone / Q000097:blood; D007030:Hypothalamo-Hypophyseal System / Q000378:metabolism; D051379:Mice; D008822:Mice, Transgenic; D010913:Pituitary-Adrenal System / Q000378:metabolism; D016372:RNA, Antisense / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics; D013315:Stress, Psychological / Q000235:genetics* / Q000378:metabolism*
chemical_list: D016372:RNA, Antisense; D012333:RNA, Messenger; D000324:Adrenocorticotropic Hormone; D003346:Corticotropin-Releasing Hormone; D006854:Hydrocortisone