Meiotic association between the XY chromosomes and the autosomal quadrivalent of a reciprocal translocation in two infertile men, 46,XY,t(19;22) and 46,XY,t(17;21).
An electron microscopy study of synaptonemal complexes in two men carrying reciprocal translocations, a t(19;22) and a t(17;21), is reported. It is shown that a delay in synapsis affects the segments corresponding to the short arms of the acrocentrics involved in the formation of quadrivalents. This appears to provoke an interaction with the sex bivalent which could lead to a failure of spermatogenesis. A study of the literature comparing reciprocal translocations that do and do not involve acrocentrics in sterile and fertile men shows the existence of a significant association between the presence of an acrocentric in the rearrangement and sterility. These results on reciprocal translocations involving at least one acrocentric chromosome correspond to those obtained in cases of Robertsonian translocations.
D002886:Chromosomes, Human, Pair 17; D002888:Chromosomes, Human, Pair 19; D002891:Chromosomes, Human, Pair 21; D002892:Chromosomes, Human, Pair 22; D006801:Humans; D007248:Infertility, Male / Q000235:genetics*; D008297:Male; D008540:Meiosis; D013090:Spermatocytes / Q000648:ultrastructure; D013573:Synaptonemal Complex; D014178:Translocation, Genetic; D014960:X Chromosome; D014998:Y Chromosome