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Human Reproduction, Vol. 17, No. 12, 3037-3038, December 2002
© 2002 European Society of Human Reproduction and Embryology

Dispermy—origin of diandric triploidy

Brief Communication

Deborah E. McFadden1, Ruby Jiang, Sylvie Langlois and Wendy P. Robinson

Departments of Pathology and Medical Genetics, Children’s and Women’s Hospital of B.C. and University of British Columbia, Vancouver, B.C. V6H 3V4, Canada

Triploidy may arise from either digynic or diandric fertilizations. Errors in the second meiotic division account for most digynic triploidy while most studies have found that ~2/3 of diandric triploids arise as the result of dispermy and 1/3 as the result of meiotic errors giving rise to diploid sperm. Using molecular markers very close to the centromere, all 14 cases of diandric triploidy were shown to be the result of dispermy with no evidence to support a meiotic error as the origin of diandric triploids.

Key words: diandry/dispermy/triploidy

1 To whom correspondence should be addressed. E-mail: dmcfadden{at}cw.bc.ca


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