¶ … Personal Details of Student
Family Name: Rooney
Given Name (s) Bridget
Student Number (SID): 312165250
Email (University email only) broo2460@uni.sydney.edu.au
GWAS OCD
Assignment number (if applicable): #1
Becker
Genetics of Brian and Mind Disorders
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Declaration:
I / We have read and understood the University of Sydney Student Plagiarism: Coursework Policy and Procedure (which can be found at sydney.edu.au/senate/policies/Plagiarism.pdf).
I / We understand that failure to comply with the Student plagiarism: coursework Policy and Procedure can lead to the University commencing proceedings against me / us for potential student misconduct under Chapter 8 of the University of Sydney By-Law 1999 (as amended).
3. This work is substantially my / our own, and to the extent that any part of this work is not my / our own I / we have indicated that it is not my / our own by acknowledging the source of that part or those parts of the work.
4. The assessment has not been submitted previously for assessment in another unit.
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Date: 10 / 09 / 15 Bridget L. Rooney
OFFICE USE ONLY
Introduction
Anxiety is unlike fear in that it is a long-lasting response to danger signals that proceed beyond actual risk or out of proportion to the possibility of a threat. It is an intense reaction that affect individuals tremendously, severely impacting their day-to-day lives. An example of an anxiety disorder subtype as defined by the DSM-IV is Obsessive-Compulsive Disorder (OCD). In the continued effort to understand and treat OCD, there is emerging research that suggests a genetic and hereditary component to the disorder.
This is a disorder with symptoms including a complex combination of intrusive obsessions and highly ritualized compulsions. OCD is a relatively frequently diagnosed neuropsychiatric disorder. Theoretically, OCD encompasses both the compulsions and obsessions leading to the entire range of behaviours and unique human thoughts that affect individuals. (Geller, et al. 2003). According to Mattheisen et al. (2014), the disorder is "characterized by intrusive thoughts and urges and repetitive, intentional behaviors that cause significant distress and impair functioning." These intrusive thoughts often cause individuals to obsess over otherwise seemingly trivial issues or concerns and feel the need to ritualize their lives in order to keep a certain balance (Knopp et al., 2013). Those who suffer from OCD often express repetitive, compulsive behaviors that are thought to be based from an internal feeling of a loss of control (Burguirer et al., 2015). Many of the disruptive thoughts or need for rituals have been attributed to neurological abnormalities, such as the "disrupted neurotransmission of glutamate within corticostriatal-thalamocortical circuitry" (Davis et al., 2013). Several other studies have also shown abnormal neurological functioning as a primary causation for OCD expression (Ahmari et al., 2013). Murphy et al. (2013) also show that those suffering from OCD tend to exhibit symptoms of other psychological disorders as well. According to the study, over 70% of individuals with OCD have major depressive disorder, with another 10% of individuals also having bipolar disorder (Murphy et al., 2013). OCD expression is often seen with disorders such as Tourette Syndrome as well, which is also thought to have a genetic component that allows families to pass on the disorder to children (Sachdev et al., 2012). According to Murphy et al. (2013), "OCD resembles disorders such as depression, in which gene x gene interactions, gene x environment interactions and stress elements coalesce to yield OC symptoms and, in some individuals, full-blown OCD with multiple comorbid disorders." Thus, there is a connection between other psychological stresses that have also been connected with genetic inheritance.
Research on OCD has uncovered some hereditary connects in regards to individuals exhibiting symptoms associated with the disorder. Studies have shown particular gene markers that are thought to contribute to the pathobiology of OCD (Browne et al., 2014). According to Stewart et al.'s 2013 report, "Genome-wide association study of obsessive compulsive disorder," OCD is a common, debilitating neuropsychiatric illness with complex genetic etiology." A number of family-designs and twin studies...
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