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Published online by Cambridge University Press: 13 June 2014
In Bipolar affective disorder, the importance of genetic factors is well established through family, twin and adoption studies. However the exact mode of inheritance is not yet known. Genetic studies using DNA linkage have been attempted to identify susceptibility genes. Linkage studies of chromosome 11 and X chromosome have proved to be inconclusive. Recent studies have focused on chromosome 18 and 21, although confirmatory findings are awaited. As such, determining which part of the genome needs to be studied remains a problem. One way of overcoming this is to look for ‘candidate’ genes, ie. genes for which a priori evidence exists that a susceptibility gene may be located nearby.
Such strategies have been used for example, trying to identify genes of interest by looking at association between chromosomal aberrations and bipolar affective disorder, and the study of co-segregation of certain diseases with affective disorder. More studies are needed to provide regions of interest. I would like to report three cases of bipolar affective disorder with a rare autoimmune disorder, cryptogenic fibrosing alveolitis.