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A cytogenetic survey of men being investigated for subfertility.

A study of 336 men attending a subfertility clinic but otherwise unselected, and a further 12 men studied as a part of the investigation of the female partner, revealed 10 with major chromosome anomaly and 3 with unambiguous chromosomal variants. In addition to those with sex chromosome aneuploidy, an extra, small marker chromosome and D/D Robertsonian translocations, anomalies which have been reported in other studies, there were 7 men with rearrangements, including a paracentric inversion of chromosome 7 and an X/21 reciprocal translocation. These would have been difficult or impossible to identify without good banded preparations, suggesting that such rearrangement may be more frequent in association with subfertility than was appreciated.