azoospermia;
complex chromosome rearrangement;
FISH;
human meiosis;
synaptonemal complex;
D O I:
10.1093/humrep/deh506
中图分类号:
R71 [妇产科学];
学科分类号:
100211 ;
摘要:
Complex chromosome rearrangements are rare aberrations that frequently lead to reproductive failure and that may hinder assisted reproduction. A 25-year-old azoospermic male was studied cytogenetically with synaptonemal complex analysis of spermatocytes from a testicular biopsy and fluorescence in situ hybridization (FISH) of lymphocytes. The spermatocytes showed a pentavalent plus a univalent chromosome. Cell death occurred mainly at advanced pachytene stages. The sex chromosomes were involved in the multiple, as shown by their typical axial excrescences. Two autosomal pairs, including an acrocentric chromosome (15), were also involved in the multiple. FISH allowed the definite identification of all the involved chromosomes. An inverted chromosome 12 is translocated with most of one long arm of chromosome 15, while the centromeric piece of this chromosome 15 is translocated with Yqh, forming a small marker chromosome t(15;Y). The euchromatic part of the Y chromosome is joined to the remaining piece of chromosome 12, forming a neo-Y chromosome. The patient shows azoospermia and a normal phenotype. The disruption of spermatogenesis is hypothetically due to the extent of asynaptic segments and to sex-body association during pachytene. This CCR occurred 'de novo' during paternal spermatogenesis. Meiotic analysis and FISH are valuable diagnostic tools in these cases.
机构:
FAC MED BUENOS AIRES, CTR INVEST REPROD, PARAGUAY 2155, RA-1121 BUENOS AIRES, DF, ARGENTINAFAC MED BUENOS AIRES, CTR INVEST REPROD, PARAGUAY 2155, RA-1121 BUENOS AIRES, DF, ARGENTINA
机构:
FAC MED BUENOS AIRES, CTR INVEST REPROD, PARAGUAY 2155, RA-1121 BUENOS AIRES, DF, ARGENTINAFAC MED BUENOS AIRES, CTR INVEST REPROD, PARAGUAY 2155, RA-1121 BUENOS AIRES, DF, ARGENTINA