Discovery of the DISC1 Gene
Cytogenetics is the study of chromosomes and how changes in chromosome structure and number affect the individual. In this video, Professor Porteous describes the process of hunting for the DISC1 gene, a gene disrupted by a balanced translocation on chromosome 1q42.
A tremendous advantage of having a family with a balanced translocation segregating with a common complex disease like this is that it allows us to pinpoint a precise region of the human genome to look at. Because thereâ€™s a very clear hypothesis here â€“ that is that the translocation has disrupted a gene and that by disrupting a gene it has had a causal link to the development of the psychiatric illness and related symptoms in that family. Now usually when you go off gene hunting, itâ€™s a hard task, even now, itâ€™s hard now to track down a particular gene within a particular region of a chromosome that might be implicated by family studies. In this case, what we needed to do was to walk along chromosome 1 until we saw a change and we started to see the signature of chromosome 11 and that transition from chromosome 1 signature to chromosome 11 signature would tell us that we had identified the translocation breakpoint. Then we could look at the sequence surrounding the breakpoint and ask â€œwhat did we find?â€ And the answer was that we found evidence for a gene. But normally when you look at a gene sequence you can get a pretty good idea early on about what itâ€™s related to â€“ to other genes in the genome because genes fall into gene families. Not in this case, it was a unique gene, a gene that weâ€™ve never seen before and thatâ€™s why we gave it the name disrupted in schizophrenia 1. And since weâ€™ve discovered it in the year 2000, weâ€™ve been working hard to try and work out what it does.
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Professor David Porteous describes how his group was first alerted to the DISC1 gene, which was found in a family with a pedigree of schizophrenia and psychoses.
Disrupted in Schizophrenia 1 (DISC1) is a candidate gene for schizophrenia.
An interactive chromosome map of the genes and loci associated with schizophrenia.
Professor David Porteous describes how his group is trying to uncover the function of the DISC1 gene.
Professor David Porteous explains that DISC1 is expressed prominently in the hippocampus. More specifically, it is expressed in the mitochondria of hippocampal cells.
Professor David Porteous discusses genes for schizophrenia and points out that susceptibility likely aligns to a combination of genetic variants.
An interactive chromosome map of the genes and loci associated with cognitive processes and disorders.
Professor David Porteous explains that breakpoints in the genome are locations on a chromosome where DNA might get deleted, inverted, or swapped around.
Doctor Anil Malhotra discusses emerging research relating specific genes to positive (DISC1) and negative (e.g. dysbindin) symptoms of schizophrenia.
An overview of bipolar disorder-related content on Genes to Cognition Online.