Human Reproduction, Vol. 14, No. 9, 2257-2263,
September 1999
© 1999 European Society of Human Reproduction and Embryology
Type and frequency of chromosome aberrations in 781 couples undergoing intracytoplasmic sperm injection
1 Department of Human Genetics, 2 Department of Endocrinology and Reproductive Medicine, University of Bonn, 53111 Bonn, Germany
Cytogenetic investigations were performed in 781 couples prior to intracytoplasmic sperm injection (ICSI) because of severe male infertility or fertilization failures in previous in-vitro fertilization attempts. Out of these 1562 patients, 1012 had a normal karyotype without any aberrations (64.8%), 204 patients had an abnormal karyotypes (13.1%). These chromosome aberrations included constitutional aberrations (4.4%), fragile sites of autosomes (3.0%), low level mosaicism of sex chromosomes (4.0%) and secondary structural chromosome aberrations (4.2%). Combinations of different types of abnormalities were stated. Another 346 patients (22.1%) showed single cell aberrations; the significance of these is unclear at the moment. Constitutional chromosome aberrations were detected in 69 patients. The following chromosome aberrations were observed: 35 sex chromosomal aberrations (comprising hyperploidies of X or Y chromosomes, mosaicisms and derivative X and Y chromosomes), 34 autosomal aberrations including 14 reciprocal translocations, five Robertsonian translocations, six inversions, one marker chromosome, one trisomy 18 mosaicism and seven other structural aberrations. Three autosomal regions showed fragile sites: 6q13 in 2.9% of the patients, 17p12 and 10q24 in 0.05% each. In conclusion, our data show that a high number of infertile couples in an ICSI programme are affected by chromosome aberrations which occur in both sexes. It is suggested that a chromosomal analysis should be performed on both partners before ICSI treatment is initiated.
Key words: chromosome aberrations/fragile sites/intracytoplasmic sperm injection/non-disjunction of gonosomes
3 To whom correspondence should be addressed at: Department of Human Genetics, University of Bonn, Wilhelmstr. 31, D-53111 Bonn, Germany
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