Evidence for a possibly X-linked trait related to affective illness

Objective: The present report attempts to replicate on the probands’ brothers, a previously reported (1992) negative relationship between maternal grandfather longevity (MGFL) and affective illness in grandsons. Hitherto this finding had not been replicated. To provide further evidence that the association may be recessive and X-linked, we also examined the association between MGFL and affective illness in the probands’ mothers. Finally, in order to examine why MGFL might be a predictor of affective illness, the report examines the association of the probands’ affective illness and their own mortality.Method: A 60-year prospective study of men selected in 1940 and followed until the present day provided good information on depressive illness in relatives and longevity of ancestors. To overcome the uncertainty of depressive diagnoses, we assessed affective illness in the probands categorically, dimensionally, operationally and with the Lazare Personality Inventory.Results: Presence of affective illness in ...