Analysis of synaptonemal complexes in two fertile heterozygous boars, both carriers of a reciprocal translocation involving an acrocentric chromosome.
An electron microscopic study of synaptonemal complexes in two heterozygous fertile boars, one a carrier of a 4;14 reciprocal translocation and the second a carrier of this translocation associated with a 3;7 reciprocal translocation, is reported. The results showed heterologous pairing in almost all quadrivalents, as well as a lack of XY-quadrivalent association. This seemed to be a common feature of translocations in pigs, even if at least one acrocentric chromosome is involved, and may represent a significant meiotic mechanism that prevents spermatocyte loss, while the production of genetically unbalanced gametes leads to loss of progeny through abortion.
Jaafar
H
H
Institut d'Embryologie, Faculté de Médecine, Strasbourg, France.
Gabriel-Robez
O
O
Ratomponirina
C
C
Boscher
J
J
Bonneau
M
M
Popescu
C P
CP
Rumpler
Y
Y
D000818:Animals; D002503:Centromere; D002871:Chromosome Banding; D005298:Fertility; D006579:Heterozygote; D007621:Karyotyping; D008297:Male; D008540:Meiosis; D013091:Spermatogenesis; D013094:Spermatozoa / Q000648:ultrastructure; D013552:Swine / Q000235:genetics*; D013573:Synaptonemal Complex; D014178:Translocation, Genetic