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Molecular Human Reproduction, Vol 3, 847-851, Copyright © 1997 by Oxford University Press

JOURNAL ARTICLE

Assisted reproductive technology and complex chromosomal rearrangements: the limits of ICSI

JP Siffroi, B Benzacken, B Straub, C Le Bourhis, MO North, G Curotti, V Bellec, S Alvarez and JP Dadoune
Laboratoire d'Histologie, Biologie de la Reproduction et Cytogenetique, Hopital Tenon, Paris, France.

Complex chromosomal rearrangements are very rare events in the human population. According to our knowledge on the consequences of simple reciprocal translocations for male fertility, translocations involving three or more chromosomes are thought to lead to severe reproductive impairments in terms of meiotic disturbance or chromosomal imbalance of gametes. We report the case of a 48 year old man whose sperm count revealed either oligozoospermia (<10(3) spermatozoa/ml) or azoospermia. He was referred to the laboratory for in-vitro fertilization after intracytoplasmic sperm injection. Cytogenetic investigations showed a complex chromosomal rearrangement involving firstly a translocation between the short arm of chromosome 7 and the long arm of chromosome 13 and secondly a translocation between the short arm of the same chromosome 13 and the short arm of chromosome 9. Diagnosis was ascertained by fluorescence in-situ hybridization and staining of the nucleolar organizer regions. Theoretical study of the translocated chromosomes predicted a 'chain' configuration of the hexavalent at the pachytene stage of meiosis. In all, 32 modes of segregation were considered and only one resulted either in a normal or a balanced gamete karyotype. Genetic counselling and choice of appropriate artificial reproduction technique are discussed.
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