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London, Aug 30 People suffering from hospital-treated depression may have a high risk of developing conditions such as substance abuse, bipolar disorder, schizophrenia and anxiety -- depending on their genetic predisposition to the individual disorder, according to a new study.The study, published in the journal Nature Medicine, showed that people with hospital-treated depression and a high genetic predisposition to bipolar disorder are 32 times more likely to develop the disease than the rest of the general population.Similarly, people with hospital-treated depression and a high genetic predisposition to schizophrenia are 14 times more likely to develop schizophrenia compared to the rest of the population.The results can pave the way for offering high-risk people preventative measures and early treatment in the future, said professor Anders Borglum from the Department of Biomedicine at Aarhus University."For example, targeted efforts that offer more frequent monitoring for the development of bipolar disorder, schizophrenia and anxiety among people with depression who have the highest genetic and clinical risk of being diagnosed with one of these disorders. This would enable early diagnosisand treatment, which we know can have beneficial effects," Borglum said.Likewise, according to Borglum, identifying people with depression and a high genetic risk of developing substance abuse could make the patient and the doctor aware of the issue. Preventative measures could then be initiated to prevent the development of substance abuse.Further, the study shows that people with hospital-treated depression and a high genetic predisposition to substance abuse have a 21 per cent risk of developing a serious substance abuse problem.This is more than five times higher than the group with a low genetic predisposition to substance abuse who have also had depression. And 10 times higher than the general population without hospital-treated depression. This group only has a 2 per cent risk of being diagnosed with substance abuse over the same period of time.Through a detailed genetic scan, the researchers studied the genome of 1.3 million people, where more than 370,000 of them suffered from depression.The researchers found a total of 11,700 genetic risk variants can explain 90 per cent of the heritability of depression, making depression one of the most complex and polygenic mental disorders. The majority of the risk genes still need to be identified."We found a number of biological systems and cell types that are affected by the genetic risk. The effects are seen in virtually all regions of the brain, but not in other organs. And mainly in the brain's nerve cells -- neurons," said Thomas Als, former associate professor at the Department ofBiomedicine."The genetic risk can affect many different types of neurons. Overall, it can be said that the genetic risk affects the development and communication of brain cells," Als said.--IANSDisclaimer: This post has been auto-published from an agency feed without any modifications to the text and has not been reviewed by an editor

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