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Older age among fathers may be associated with an increased risk for bipolar disorder in their offspring, according to a study by researchers at the Swedish medical university Karolinska Institutet. The new finding is published in the September issue of Archives of General Psychiatry, one of the JAMA/Archives journals.
Bipolar disorder is a common, severe mood disorder involving episodes of mania and depression. Other than a family history of psychotic disorders, few risk factors for the condition have been identified. Older paternal age has previously been associated with a higher risk of complex neurodevelopmental disorders, including schizophrenia and autism.
Postgraduate student Emma Frans and colleagues at the Department of Medical Epidemiology and Biostatics identified 13,428 patients in Swedish registers with a diagnosis of bipolar disorder. For each one, they randomly selected from the registers five controls who were the same sex and born the same year but did not have bipolar disorder.
When comparing the two groups, the older an individual's father, the more likely he or she was to have bipolar disorder. After adjusting for the age of the mother, participants with fathers older than 29 years had an increased risk. The offspring of men 55 years and older were 1.37 times more likely to be diagnosed as having bipolar disorder than the offspring of men aged 20 to 24 years.
The offspring of older mothers also had an increased risk, but it was less pronounced than the paternal effect, the authors note. For early-onset bipolar disorder (diagnosed before age 20), the effect of the father's age was much stronger and there was no association with the mother's age.
As men age, successive germ cell replications occur and new mutations accumulate monotonously as a result of DNA copy errors. Women are born with their full supply of eggs that have gone through only 23 replications, a number that does not change as they age. Therefore, DNA copy errors should not increase in number with maternal age.
- Consistent with this notion, we found smaller effects of increased maternal age on the risk of bipolar disorder in the offspring, says Emma Frans.
Publication: 'Advancing Paternal Age and Bipolar Disorder', Emma M Frans, Sven Sandin, Abraham Reichenberg, Paul Lichtenstein, Niklas Långström, Christina M Hultman, Archives of General Psychiatry, 1 September 2008;65[9]:1034-1040.
Further questions, please contact:
Postgraduate student Emma Frans
Tel: +46 8 524 861 72 +46 73-1510706or
E-mail: emma.frans@ki.se
Associate Professor Christina Hultman
Tel: +46 8 - 524 838 93 or +46 70-362 10 31
E-mail: Christina.Hultman@ki.se
Press Officer Katarina Sternudd
Tel: +46 8-524 838 95 or +46 70-224 38 95
E-post: Katarina.sternudd@ki.se
Karolinska Institutet is one of the leading medical universities in Europe. Through research, education and information, Karolinska Institutet contributes to improving human health. Each year, the Nobel Assembly at Karolinska Institutet awards the Nobel Prize in Physiology or Medicine. For more information, visit ki.se
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